Journal articles: 'Multiaxial fatigue'

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Ronchei, Camilla, Andrea Carpinteri, Giovanni Fortese, Daniela Scorza, and Sabrina Vantadori. "Fretting High-Cycle Fatigue Assessment through a Multiaxial Critical Plane-Based Criterion in Conjunction with the Taylor’s Point Method." Solid State Phenomena 258 (December 2016): 217–20. http://dx.doi.org/10.4028/www.scientific.net/ssp.258.217.

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The critical plane-based multiaxial criterion originally proposed by the authors for plain fatigue is here applied to estimate the crack initiation life of fretting high-cycle fatigued structural components. Although fretting fatigue can be regarded as a case of multiaxial fatigue, the common multiaxial fatigue criteria have to be modified to account for the severe stress gradients in the contact zone. Therefore, the above criterion is used in conjunction with the Taylor’s point method to numerically estimate the fatigue life of Ti-6Al-4V and Al-4Cu specimens under cylindrical contacts.

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Lu, Chun, Jiliang Mo, Ruixue Sun, Yuanke Wu, and Zhiyong Fan. "Investigation into Multiaxial Character of Thermomechanical Fatigue Damage on High-Speed Railway Brake Disc." Vehicles 3, no. 2 (June 1, 2021): 287–99. http://dx.doi.org/10.3390/vehicles3020018.

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The multiaxial character of high-speed railway brake disc thermomechanical fatigue damage is studied in this work. Although the amplitudes and distributions of temperature, strain and stress are similar with uniform and rotating loading methods, the multiaxial behavior and out-of-phase failure status can only be revealed by the latter one. With the help of a multiaxial fatigue model, fatigue damage evaluation and fatigue life prediction are implemented, the contribution of a uniaxial fatigue parameter, multiaxial fatigue parameter and out-of-phase failure parameter to the total damage is discussed, and it is found that using the amplitude and distribution of temperature, stress and strain for fatigue evaluation will lead to an underestimation of brake disc thermomechanical fatigue damage. The results indicate that the brake disc thermomechanical fatigue damage belongs to a type of multiaxial fatigue. Using a uniaxial fatigue parameter causes around 14% underestimation of fatigue damage, while employing a multiaxial fatigue parameter without the consideration of out-of-phase failure will lead to an underestimation of about 5%. This work explains the importance of studying the thermomechanical fatigue damage of the brake disc from the perspective of multiaxial fatigue.

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Shang, De Guang, Guo Qin Sun, Jing Deng, and Chu Liang Yan. "Multiaxial Fatigue Damage Models." Key Engineering Materials 324-325 (November 2006): 747–50. http://dx.doi.org/10.4028/www.scientific.net/kem.324-325.747.

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Two multiaxial damage parameters are proposed in this paper. The proposed fatigue damage parameters do not include any weight constants, which can be used under either multiaxial proportional loading or non-proportional loading. On the basis of the research on the critical plane approach for the tension-torsion thin tubular multiaxial fatigue specimens, two multiaxial fatigue damage models are proposed by combining the maximum shear strain and the normal strain excursion between adjacent turning points of the maximum shear strain on the critical plane. The proposed multiaxial fatigue damage models are used to predict the fatigue lives of the tension-torsion thin tube, and the results show that a good agreement is demonstrated with experimental data.

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Wang, C. H., and M. W. Brown. "Life Prediction Techniques for Variable Amplitude Multiaxial Fatigue—Part 1: Theories." Journal of Engineering Materials and Technology 118, no. 3 (July 1, 1996): 367–70. http://dx.doi.org/10.1115/1.2806821.

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Fatigue life prediction under multiaxis random loading is an extremely complex and intractable topic; only a few methods have been proposed in the literature. In addition, experimental results under multiaxis random loading are also scarce. In part one of this two-part paper, a multiaxial non-proportional cycle counting method and fatigue damage calculation procedure are proposed, which is compared with one published damage-searching method. Both theories are based on critical plane concepts, one being an extension of the local strain approach for uniaxial variable amplitude loading and the other employing a new counting algorithm for multiaxis random loading. In principle, these two methods can be considered as bounding solutions for fatigue damage accumulation under multiaxis random loading.

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Liu, Jianhui, Xin Lv, Yaobing Wei, Xuemei Pan, Yifan Jin, and Youliang Wang. "A novel model for low-cycle multiaxial fatigue life prediction based on the critical plane-damage parameter." Science Progress 103, no. 3 (July 2020): 003685042093622. http://dx.doi.org/10.1177/0036850420936220.

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Multiaxial fatigue of the components is a very complex behavior. This analyzes the multiaxial fatigue failure mechanism, reviews and compares the advantages and disadvantages of the classic model. The fatigue failure mechanism and fatigue life under multiaxial loading are derived through theoretical analysis and formulas, and finally verified with the results of multiaxial fatigue tests. The model of multiaxial fatigue life for low-cycle fatigue life prediction model not only improves the prediction accuracy of the classic model, but also considers the effects of non-proportional additional hardening phenomena and fatigue failure modes. The model is proved to be effective in low-cycle fatigue life prediction under different loading paths and types for different materials. Compared with the other three classical models, the proposed model has higher life prediction accuracy and good engineering applicability.

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Yin, Xiang, De-Guang Shang, Gang Zhang, Dao-Hang Li, Hang Zhang, Cheng Qian, Shuai Zhou, and Guo-Cheng Hao. "Thermal-mechanical fatigue life prediction considering fatigue-creep interaction effects." Journal of Physics: Conference Series 2569, no. 1 (August 1, 2023): 012074. http://dx.doi.org/10.1088/1742-6596/2569/1/012074.

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Abstract This study proposed a multiaxial variable temperature and amplitude damage assessment model to predict the variable temperature and amplitude fatigue life of high-temperature alloys, which are often subjected to varying multiaxial mechanical and temperature loads. To validate the proposed model, seven variable temperature and amplitude fatigue tests were conducted on GH4169 nickel-based high-temperature alloy. The proposed model shows good accuracy and reliability in predicting the lifetime of high-temperature alloy components under multiaxial mechanical and temperature loads.

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Wang, Lei, Wu Zhen Li, and Tian Zhong Sui. "Review of Multiaxial Fatigue Life Prediction Technology under Complex Loading." Advanced Materials Research 118-120 (June 2010): 283–88. http://dx.doi.org/10.4028/www.scientific.net/amr.118-120.283.

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The research on multiaxial fatigue life prediction methods is reviewed in the present paper from two aspects of experiment and theory. It is pointed out that the reasonable methods of the critical plane determining, multiaxial cycle counting and multiaxial fatigue damage parameter fixing are necessary if the fatigue life prediction models established under the multiaxial constant amplitude loading were applied to the life prediction of the complex multiaxial load. The shortcomings of existing researches are discussed. In the aspect of experiment, it is devoid of the multiaxial fatigue test that the loading components acted with different frequencies, and in the aspect of theory, the additional hardening effect of the multiaxial out-of-frequency loading is not considered. Both in the theoretical research and practical engineering applications, the problem of the out-of-frequency multiaxial loading is a pressing issue.

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Zhao, Er Nian, and Wei Lian Qu. "Multiaxial Fatigue Life Prediction of Metallic Materials Based on Critical Plane Method under Non-Proportional Loading." Key Engineering Materials 730 (February 2017): 516–20. http://dx.doi.org/10.4028/www.scientific.net/kem.730.516.

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The critical plane method is widely discussed because of its effectiveness for predicting the multiaxial fatigue life prediction of metallic materials under the non-proportional loading conditions. The aim of the present paper is to give a comparison of the applicability of the critical plane methods on multiaxial fatigue life prediction. A total of 205 multiaxial fatigue test data of nine kinds of metallic materials under various strain paths are adopted for the experimental verification. Results shows that the von Mises effective strain parameter and KBM critical plane parameter can give well predicted fatigue lives for multiaxial proportional loading conditions, but give poor prediction lives evaluation for multiaxial non-proportional loading conditions. However, FS parameter shows better accuracy than the KBM parameter for multiaxial fatigue prediction for both proportional and non-proportional loading conditions.

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Bercelli, Lorenzo, Cédric Doudard, and Sylvain Moyne. "Taking into account the non-proportional loading effect on high cycle fatigue life predictions obtained by invariant-based approaches." MATEC Web of Conferences 300 (2019): 12003. http://dx.doi.org/10.1051/matecconf/201930012003.

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Industrial structures are often subjected to multiaxial fatigue loadings. If the multiple stress signals are not synced the loading is said to be non-proportional. Most of the multiaxial fatigue criteria give highly inaccurate lifetime predictions when used in the case of such loadings. The scalar equivalent stress defined by the criteria does not take into account the non-proportional nature of the multiaxial loading and leads to non-conservative predictions. Moreover a multiaxial fatigue criterion can only be applied on a stress cycle which has no clear definition when multiple unsynced signals are to be considered. This study addresses these issues by proposing a correction of an invariant based multiaxial fatigue criterion through the definition of a non-proportional degree indicator. A definition of multiaxial cycle is also given based on the Wang-Brown method. Finally a complete chain of invariant based lifetime prediction for non-proportional multiaxial fatigue is validated.

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Poisson, J. L., S. Méo, F. Lacroix, G. Berton, and N. Ranganathan. "MULTIAXIAL FATIGUE CRITERIA APPLIED TO A POLYCHLOROPRENE RUBBER." Rubber Chemistry and Technology 85, no. 1 (March 1, 2012): 80–91. http://dx.doi.org/10.5254/1.3672431.

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Abstract Due to their interesting mechanical behavior and their diversity, rubber materials are more and more used in industry. Indeed, formulating a multiaxial fatigue criterion to predict fatigue lives of rubber components constitutes an important objective to conceive rubber products. An experimental campaign is developed here to study the multiaxial fatigue behavior of polychloroprene rubber. To reproduce multiaxial solicitations, combined tension–torsion tests were carried out on a dumbbell-type specimen (an axisymmetric rubber part bonded to metal parts with a reduced section at mid-height), with several values of phase angles between tension and torsion. A constitutive model is needed to calculate multiaxial fatigue criteria, and then analyze fatigue results. A large strain viscoelastic model, based on the tension–torsion kinematics, is then used to determine the material's stress–strain law. Dissipated energy density is introduced as a multiaxial fatigue criterion, and compared with those usually used in the literature. A multiaxial Haigh diagram is then built to observe the influence of Rd-ratio (ratio of the axial displacement's minimum to the axial displacement's maximum) on the multiaxial fatigue lives of polychloroprene rubber.

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11

Gao, Ganggang, Jianhui Liu, Xuebin Lu, and Rong Zhang. "A damage-based method to predict crack initiation lifetime of high-strength steel under proportional bending-torsional loadings." Advances in Mechanical Engineering 14, no. 8 (August 2022): 168781322211184. http://dx.doi.org/10.1177/16878132221118479.

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The fatigue life of specimen consists of crack initiation and crack propagation life. As the fracture toughness of high strength steel is low, the specimen will fail soon once crack appears. Therefore, the crack initiation life of high strength steel is considered to be its whole life. Based on the evolution of material fatigue damage and the critical plane method commonly used in multiaxial fatigue strength theory, a crack initiation life prediction method for multiaxial specimens is proposed in this paper. Firstly, a uniaxial nonlinear fatigue damage evolution equation is proposed based on the principles of thermodynamics and continuous damage mechanics. Then, a theoretical calculation method for determining the critical plane under multiaxial load is proposed, and the specific calculation process is given. After the critical plane is determined, the multiaxial fatigue damage parameter is constructed from the normal strain amplitude and shear strain amplitude on the critical plane, and a multiaxial nonlinear fatigue damage evolution equation is proposed by replacing the uniaxial damage parameter using the multiaxial damage parameter. Finally, the crack initiation life of fatigue specimens is predicted by using the proposed multiaxial nonlinear fatigue damage evolution equation, and the multiaxial fatigue tests of Q690D steel under different bending-torsion ratios and different amplitudes are validated. The comparison results show that the prediction error of the proposed method is within the two-fold dispersion band and better than that of Manson-Coffin method.

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12

Wu, Zhirong, Ying Pan, Hang Lei, Shuaiqiang Wang, and Lei Fang. "Fatigue Crack Growth Behavior and Failure Mechanism of Nickel-Based Alloy GH4169 under Biaxial Load Based on Fatigue Test of Cruciform Specimen." Metals 13, no. 3 (March 14, 2023): 588. http://dx.doi.org/10.3390/met13030588.

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Due to the complex geometry and various cyclic loads, aeroengine components are often in a multiaxial complex stress state during service. Multiaxial fatigue is a major cause of many air accidents. It is of great significance to study the fatigue failure mechanism of aeronautical materials. This paper carries out biaxial fatigue tests on cruciform specimens and uses the surface replication method to record the initiation and propagation process of crack. Based on these fatigue tests, this paper studies the multiaxial fatigue characteristics of nickel-based alloy GH4169 for aeroengines and analyzes the fatigue crack growth behavior and failure mechanism of nickel-based alloys under a complex multiaxial stress state.

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Amjadi, Mohammadreza, and Ali Fatemi. "Multiaxial Fatigue Behavior of High-Density Polyethylene (HDPE) Including Notch Effect: Experiments and Modeling." MATEC Web of Conferences 300 (2019): 05001. http://dx.doi.org/10.1051/matecconf/201930005001.

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High-Density Polyethylene (HDPE) is used in many industries with many applications from automotive industry to biomedical implants. It can be manufactured using different processing techniques including compression molding, injection molding, and blow molding. Multiaxial loading and non-proportionality between different loading sources are inevitable in many applications. It is shown that the common multiaxial fatigue criteria such as von Mises equivalent stress are not able to correlate the multiaxial fatigue data. In this study, multiaxial fatigue behavior of neat HDPE is investigated using hollow tubular specimens through experimental fatigue tests. Axial, torsion, and combined in phase and out-of-phase axial-torsion fatigue tests were conducted. Stress concentration effect on multiaxial fatigue behavior was also studied. Experimental results and analytical models used to account for the aforementioned effects are presented and discussed in this paper.

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Shirafuji, Nakao, Kenji Shimomizuki, Masao Sakane, and Masateru Ohnami. "Tension-Torsion Multiaxial Low Cycle Fatigue of Mar-M247LC Directionally Solidified Superalloy at Elevated Temperature." Journal of Engineering Materials and Technology 120, no. 1 (January 1, 1998): 57–63. http://dx.doi.org/10.1115/1.2806838.

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This paper studies the high temperature multiaxial low cycle fatigue of Mar-M247LC directionally solidified superalloy. Tension-torsion multiaxial low cycle fatigue tests were carried out using Mar-M247LC tubular specimens at 1173K in air. Several multiaxial strain and stress parameters were applied to the experimental data to examine the suitability of the parameters. All the multiaxial strain parameters proposed so far could not successfully correlate the multiaxial low cycle fatigue data of the directionally solidified superalloy, but the maximum principal stress and the equivalent stress based on crack opening displacement could correlate the data within a small scatter. This paper proposes a new multiaxial strain parameter which takes account of the anisotropy of elastic constant of directionally solidified superalloys. The proposed strain parameter correlates the multiaxial low cycle fatigue data within a factor of two scatter band. This paper also describes the crack mode and cyclic constitutive relation of the superalloy in connection with the anisotropy of the elastic constant.

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Wang, Lei, Tian Zhong Sui, Hang Zhao, and En Guo Men. "Probabilistic Model of the Multiaxial Low-Cycle Fatigue Life Prediction." Advanced Materials Research 479-481 (February 2012): 2135–40. http://dx.doi.org/10.4028/www.scientific.net/amr.479-481.2135.

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First, several widely used models of the multiaxial low-cycle fatigue life prediction based on the critical plane approach were presented in this paper, and the predicted results of these models for a medium carbon steel under the condition of multiaxial low-cycle fatigue loading were compared. Second, the stochastic expressions and probability density function curves of the fatigue performance parameters were obtained by probabilistic analysis of the medium carbon steel fatigue data. Finally, the probabilistic model of the multiaxial fatigue life prediction was simulated by Monte Carlo Method, which should provide a basis for the reliability analysis of engineering components subjected to the multiaxial complex loads.

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Li, Bochuan, Chao Jiang, Xu Han, and Yuan Li. "The prediction of multiaxial fatigue probabilistic stress–life curve by using fuzzy theory." Artificial Intelligence for Engineering Design, Analysis and Manufacturing 31, no. 2 (May 2017): 199–206. http://dx.doi.org/10.1017/s0890060417000087.

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AbstractThe fuzziness of the traditional multiaxial fatigue prediction model is discussed and the fuzzy theory is applied into fatigue reliability analysis. The fuzzy linear regression analysis method is used to determine the fuzzy coefficients in the multiaxial stress–life equation under a small sample condition, and the corresponding multiaxial fatigue probabilistic stress–life curve is calculated with different confidence levels.

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Ellyin, Fernand. "Multiaxial Fatigue--A Perspective." Key Engineering Materials 345-346 (August 2007): 205–10. http://dx.doi.org/10.4028/www.scientific.net/kem.345-346.205.

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Research on the fatigue resistance of mechanical components/structures has been proceeding for nearly a century and a half. Yet, there is no universally agreed upon theory that can predict most aspects of fatigue failure. The reason is the complexity of phenomenon and its dependence on the microstructure. Here, we present a strain energy based damage parameter which has an underlying microscopic basis. A master life curve is subsequently defined which correlates very well with experimental data.

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Socie, D. "Multiaxial Fatigue Damage Models." Journal of Engineering Materials and Technology 109, no. 4 (October 1, 1987): 293–98. http://dx.doi.org/10.1115/1.3225980.

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Two multiaxial fatigue damage models are proposed: a shear strain model for failures that are primarily mode II crack growth and a tensile strain model for failures that are primarily mode I crack growth. The failure mode is shown to be dependent on material, strain range and hydrostatic stress state. Tests to support these models were conducted with Inconel 718, SAE 1045, and AISI Type 304 stainless steel tubular specimens in strain control. Both proportional and non-proportional loading histories were considered. It is shown that the additional cyclic hardening that accompanies out of phase loading cannot be neglected in the fatigue damage model.

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Ellyin, F., and K. Golos. "Multiaxial Fatigue Damage Criterion." Journal of Engineering Materials and Technology 110, no. 1 (January 1, 1988): 63–68. http://dx.doi.org/10.1115/1.3226012.

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A multiaxial fatigue failure criterion is proposed based on the strain energy density damage law. The proposed criterion is hydrostatic pressure sensitive; includes the effect of the mean stress, and applies to materials which do not obey the idealized Masing type description. The material constants can be evaluated from two simple test results, e.g., uniaxial tension, and torsion fatigue tests. The predicted results are compared with biaxial tests and the agreement is found to be fairly good. A desirable feature of this criterion is its unifying nature for both short and long cyclic lives. It is also consistent with the crack initiation and propagation phases of the fatigue life, in the sense that both of these phases can be related to the strain energy density either locally or globally.

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Chateauminois, Antoine. "Multiaxial fatigue and fracture." Tribology International 34, no. 10 (October 2001): 725–26. http://dx.doi.org/10.1016/s0301-679x(01)00060-3.

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Ainsworth, R. A. "Multiaxial Fatigue and Fracture." International Journal of Pressure Vessels and Piping 77, no. 7 (June 2000): 435–36. http://dx.doi.org/10.1016/s0308-0161(00)00039-9.

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Hales, R. "Multiaxial creep-fatigue rules." Nuclear Engineering and Design 153, no. 2-3 (January 1995): 257–64. http://dx.doi.org/10.1016/0029-5493(94)00832-j.

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Hales, R., and R. A. Ainsworth. "Multiaxial creep–fatigue rules." Nuclear Engineering and Design 153, no. 2-3 (January 1995): 257–64. http://dx.doi.org/10.1016/0029-5493(95)90017-9.

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Radhakrishnan, V. M. "Multiaxial fatigue — An overview." Sadhana 20, no. 1 (February 1995): 103–22. http://dx.doi.org/10.1007/bf02747286.

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Wang, Lei, Tian Zhong Sui, and Qiu Cheng Tian. "Life Prediction and Verification under Multiaxial Fatigue Loading." Applied Mechanics and Materials 365-366 (August 2013): 991–94. http://dx.doi.org/10.4028/www.scientific.net/amm.365-366.991.

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The strain change characteristics of multiaxial fatigue are analyzed under the condition of the combined tension and torsion loading for thin-tube specimen. Based on the principle of multiaxial critical plane approach, a multiaxial fatigue damage parameter is established, which takes account of the effect of not only the maximum shear strain amplitude and normal strain amplitude on the critical plane but also the parameter of non-proportionality. The non-proportionality is the function of loading parameters which is closely contact with the strain change characteristics of multiaxial fatigue and it can indicate the whole material damage. The experiments under the tension-torsion proportional and non-proportional loading were conducted to verify the multiaxial fatigue life model proposed in this paper. The life prediction has a good correlation with the experimental results.

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Machado, Pedro Vinícius Sousa, Lucas Carneiro Araújo, Marcos Venicius Soares, and José Alexander Araújo. "The use of a modified critical plane model to assess multiaxial fatigue of steels with nonmetallic inclusions." MATEC Web of Conferences 300 (2019): 16005. http://dx.doi.org/10.1051/matecconf/201930016005.

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The goal of this research is to investigate the detrimental effect of non-metallic inclusions on the fatigue strength of the AISI 4140 steel under multiaxial loading conditions. In order to do so, a multiaxial fatigue model based on the critical plane approach is coupled with Murakami’s √area model. The proposed adaptation is very easy to calibrate and can also account for the higher probability of existing a fatal small defect as the volume of stresses material increases. Experimental multiaxial fatigue data were generated and compared with the estimates provided by the adapted multiaxial fatigue model and with its original version. The errors found are not higher than 10%.

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Wang, Lei, Tian Zhong Sui, Yu Ma, and Yan Sun. "Determination of the Critical Plane under the Multiaxial Complex Loading." Advanced Materials Research 544 (June 2012): 182–87. http://dx.doi.org/10.4028/www.scientific.net/amr.544.182.

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Engineering components and structures in service are generally subjected to the multiaxial complex loads. The approach of critical plane has been widely accepted by most researchers as the best method in the multiaxial fatigue research field. It can be used well in the constant multiaxial fatigue loads, but not in the complex loads. Basis on analyzing characteristics of shear strain on material planes, the concept of weight-averaged maximum shear strain plane is proposed. A procedure is presented to determine the critical plane under multiaxial random loading. The angle values of the planes that experience peak values of maximum shear strains are averaged by employing the weight function, which is assumed to take into account the main factors of influencing the fatigue behavior, e.g. fatigue damage. The proposed algorithm is applied to the multiaxial in- and out-of-phase experiments to assess the correlation between the weight-averaged maximum shear strain direction and the position of the experimental fatigue crack initiation plane.

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Itoh, Takamoto, Fumio Ogawa, and Takahiro Morishita. "Fatigue Testing and Evaluation of Fatigue Strength under Multiaxial Stress State; Why do we need fatigue testing?" MATEC Web of Conferences 159 (2018): 01050. http://dx.doi.org/10.1051/matecconf/201815901050.

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Types of multiaxial fatigue tests and their experimental results are presented in this paper. There are typical three types in multiaxial fatigue tests: the combining push-pull and reversed torsion loading test using hollow cylinder specimen, the biaxial tension-compression test using cruciform specimen and the inner pressure applied the push-pull loading test using the hollow cylinder specimen. In the combining a push-pull loading and a reversed torsion loading test, failure life under non-proportional loading in which principal directions of stress and strain were changed in a cycle was shortened compared to proportional loading in which those are fixed. Fatigue lives were well-correlated using a non-proportional strain range considering the effect of strain path and material dependence. In the biaxial tension-compression test, the failure life decreased with increase of the principal strain ratio. In the inner pressure applied the push-pull loading test, cyclic deformation behaviour due to complex loading paths of multiaxial fatigue tests with the inner pressure associated with push-pull and rev. torsion acted to reduce the failure lives. Experimental investigation of multiaxial failure life and elucidation of their governing mechanism is essential and it can broaden the applicability of structural components.

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Kallmeyer, Alan R., Ahmo Krgo, and Peter Kurath. "Evaluation of Multiaxial Fatigue Life Prediction Methodologies for Ti-6Al-4V." Journal of Engineering Materials and Technology 124, no. 2 (March 26, 2002): 229–37. http://dx.doi.org/10.1115/1.1446075.

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Many critical engineering components are routinely subjected to cyclic multiaxial stress states, which may include non-proportional loading and multidimensional mean stresses. Existing multiaxial fatigue models are examined to determine their suitability at estimating fatigue damage in Ti-6Al-4V under complex, multiaxial loading, with an emphasis on long-life conditions. Both proportional and non-proportional strain-controlled tension/torsion experiments were conducted on solid specimens. Several multiaxial fatigue damage parameters are evaluated based on their ability to correlate the biaxial fatigue data and uniaxial fatigue data with tensile mean stresses (R>−1) to a fully-reversed (R=−1) uniaxial baseline. Both equivalent stress-based models and critical plane approaches are evaluated. Only one equivalent stress model and two critical plane models showed promise for the range of loadings and material considered.

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Su, Wei, and Hong Mei Zhu. "Multiaxial fatigue behavior of a 2198-T8 Al–Li alloy under proportional and nonproportional loading." Materials Testing 64, no. 11 (November 1, 2022): 1572–85. http://dx.doi.org/10.1515/mt-2022-0172.

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Abstract 2198-T8 Al–Li alloy was examined under different loading path. Uniaxial and multiaxial proportional and nonproportional loading tests were conducted to determine the material fatigue constant, and to study the multiaxial fatigue behavior, respectively. The multiaxial fatigue life was estimated by various criteria. The results show that, the torsional fatigue performance is better than the tension–compression fatigue performance. The fatigue life of nonproportional loading increases firstly and then decreases with the increase of phase difference from 0° to 90°. Shear Findley model and SWT model were modified by introducing shear damage parameters. The modified models provide fine results which are all within a factor of two.

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Camara, Aliou Badara, Fabienne Pennec, Sébastien Durif, Jean-Louis Robert, and Abdelhamid Bouchaïr. "Bolt fatigue parametric study of a bolted assembly." MATEC Web of Conferences 300 (2019): 04002. http://dx.doi.org/10.1051/matecconf/201930004002.

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Structural integrity of aircraft, nuclear power plants, space rockets, ships, automotive structures, biomedical devices, and many other applications, is a major design purpose and concerns various components subjected to cyclic loads for which fatigue is generally the dominant factor leading to its failure. The fatigue damage cumulation phenomenon is a process which may lead to cracks initiation and possibly to the structure failure under the action of variables stresses cycles. The mechanical components are generally subjected to multiaxial stress states. Taking into account this stress states triaxiality generally deals with multiaxial fatigue criteria. They are suitable tools for assessing the material fatigue resistance against periodical stress states, especially when they are multiaxial. The study carried out in this paper aims to analyze the fatigue behaviour of pre-stressed bolts involved in a so-called tee-stub bolted assembly that is subjected to variable loads. A multiaxial fatigue post-processing tool using two multiaxial fatigue approaches (integral approach and critical plan approach) is developed and implemented on Matlab software in order to assess the bolt fatigue damage and then its fatigue life through an iterative process. The tool is validated by fatigue test results on bolted assemblies found in the literature, which are additionally compared with those obtained by standards (Eurocode, VDI). A parametric study on the tee-stub is then performed.

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Itoh, Takamoto, Masao Sakane, and Masateru Ohnami. "High Temperature Multiaxial Low Cycle Fatigue of Cruciform Specimen." Journal of Engineering Materials and Technology 116, no. 1 (January 1, 1994): 90–98. http://dx.doi.org/10.1115/1.2904261.

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This paper describes high temperature multiaxial low cycle fatigue lives of type SUS304 stainless steel and 1Cr-1Mo-1/4V steel cruciform specimens at 923K and 823K in air. Strain controlled multiaxial low cycle fatigue tests were carried out using cruciform specimens at the principal strain ratios between −1 and 1. The principal strain ratio had a significant effect on low cycle fatigue lives. Fatigue lives drastically decreased as the principal strain ratio increased. Multiaxial low cycle faitgue strain parameters were applied to the experimental data and the applicability of the parameters was discussed. The equivalent strain based on crack opening displacement (COD strain) developed in the paper and Γ* —plane parameter successfully predicted multiaxial low cycle fatigue lives. The crack morphology was also extensively discussed from not only the surface crack direction but also the crack inclination into the specimen.

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Zhang, Jia-Liang, De-Guang Shang, Yu-Juan Sun, and Xiao-Wei Wang. "Multiaxial high-cycle fatigue life prediction model based on the critical plane approach considering mean stress effects." International Journal of Damage Mechanics 27, no. 1 (July 11, 2016): 32–46. http://dx.doi.org/10.1177/1056789516659331.

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The aim of this paper is to propose a modified multiaxial high-cycle fatigue criterion based on the critical plane approach. The proposed criterion contains three parameters, that is, shear stress amplitude, normal stress amplitude and mean normal stress. In order to take into account the mean shear stress effects, the critical plane is determined by the maximum shear stress. In the proposed multiaxial fatigue criterion, the influence of mean normal stress on fatigue damage is also considered. Based on the proposed criterion, the multiaxial fatigue life is predicted, and the results showed a good agreement with experimental data obtained from some literatures.

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Soares, Henrique, Vitor Anes, Manuel Freitas, and Luis Reis. "A railway wheel evaluation under multiaxial loading conditions." MATEC Web of Conferences 300 (2019): 09002. http://dx.doi.org/10.1051/matecconf/201930009002.

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Railway mechanical components are subject to thousands of fatigue cycles. Fatigue damage and life assessment is still an open issue. Under service multiaxial loading conditions several challenges can arise. In this study an evaluation of a railway wheel material is performed, i.e. the material properties and the working conditions are taking into account and evaluated. Different mechanical tests are carried out, namely fatigue tests under uniaxial (LCF+HCF) and biaxial (HCF) conditions, applied to several specimens made from the railway wheel. Multiaxial fatigue models were considered regarding the fatigue life estimation. Moreover, fatigue crack plane measurements were compared with estimations from several critical plane models. The applied models provided very satisfactory results, regarding the fatigue life estimation and the initial crack initiation plane under the multiaxial loadings conditions.

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35

Isono, Yoshitada, Masao Sakane, Masateru Ohnami, and Kazunari Fujiyama. "Multiaxial Low-Cycle Fatigue Damage Evaluation Using A. C. Potential Method for Alloy 738LC Superalloy." Journal of Engineering Materials and Technology 116, no. 4 (October 1, 1994): 488–94. http://dx.doi.org/10.1115/1.2904318.

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This paper studies tension/torsion multiaxial low-cycle fatigue lives and creep-fatigue damage evaluation for Alloy 738LC superalloy. Tension/torsion creep-fatigue tests were carried out using hollow cylinder specimens and multiaxial creep-fatigue lives were obtained. The Mises’ equivalent strain correlated the multiaxial low cycle fatigue lives within a factor of two scatter band. An a.c. potential method is developed to detect the creep-fatigue damage associated with crack nucleation and extension. A.c. potentials at high frequencies accurately detect the creep-fatigue damage from the early stage of life while those at low frequencies detect that in the final stage of life. A.c. potentials at high frequencies detect the crack density, defined as the total crack length per unit area, and maximum crack length more sensitively than those at low frequencies.

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Bellett, Daniel, Etienne Pessard, and Franck Morel. "A Flexible HCF Modeling Framework Leading to a Probabilistic Multiaxial Kitagawa-Takahashi Diagram." Advanced Materials Research 891-892 (March 2014): 1372–78. http://dx.doi.org/10.4028/www.scientific.net/amr.891-892.1372.

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This article describes a flexible modeling framework which leads to the construction of a probabilistic, multiaxial Kitagawa-Takahashi diagram. This framework has been developed following experimental observations that clearly indicate that two independent fatigue damage mechanisms can be activated, at the same time, in metallic materials. Specifically, one damage mechanism is associated with crack initiation and the other with crack arrest. It is postulated that these damage mechanisms are more appropriately modeled using two different fatigue criteria or, more specifically, two completely different approaches to fatigue (i.e. a classical multiaxial fatigue criterion and a LEFM type criterion). Hence, the proposed modeling framework provides the possibility of combining any two suitable criteria, in a probabilistic framework based on the weakest link hypothesis and results in the continuous description of the Kitagawa diagram for any multiaxial stress state. It is shown that under certain conditions this approach is equivalent to the classical El Haddad approach to the short crack problem encountered in LEFM. However, the proposed framework is easily extended to multiaxial loading conditions. This modeling framework is demonstrated in detail via its application to multiaxial fatigue data for data taken from the literature.

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Malek, Benaïssa, Catherine Mabru, and Michel Chaussumier. "Multiaxial fatigue behavior of 2618 aluminum alloy." MATEC Web of Conferences 300 (2019): 09003. http://dx.doi.org/10.1051/matecconf/201930009003.

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The purpose of the present research project is to study multiaxial fatigue behavior of 2618 alloy. The influence of mean stress on the fatigue behavior under tension and torsion is particularly investigated. Fatigue tests under combined tensile-torsion, in or out of phase, as well as combined tensile-torsion-internal pressure tests have also been conducted. Multiaxial fatigue results are analyzed according to Fatemi-Socie criterion to predict the fatigue life.

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Costa, Pedro, Richard Nwawe, Henrique Soares, Luís Reis, Manuel Freitas, Yong Chen, and Diogo Montalvão. "Review of Multiaxial Testing for Very High Cycle Fatigue: From ‘Conventional’ to Ultrasonic Machines." Machines 8, no. 2 (May 13, 2020): 25. http://dx.doi.org/10.3390/machines8020025.

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Fatigue is one of the main causes for in service failure of mechanical components and structures. With the development of new materials, such as high strength aluminium or titanium alloys with different microstructures from steels, materials no longer have a fatigue limit in the classical sense, where it was accepted that they would have ‘infinite life’ from 10 million (107) cycles. The emergence of new materials used in critical mechanical parts, including parts obtained from metal additive manufacturing (AM), the need for weight reduction and the ambition to travel greater distances in shorter periods of time, have brought many challenges to design engineers, since they demand predictability of material properties and that they are readily available. Most fatigue testing today still uses uniaxial loads. However, it is generally recognised that multiaxial stresses occur in many full-scale structures, being rare the occurrence of pure uniaxial stress states. By combining both Ultrasonic Fatigue Testing with multiaxial testing through Single-Input-Multiple-Output Modal Analysis, the high costs of both equipment and time to conduct experiments have seen a massive improvement. It is presently possible to test materials under multiaxial loading conditions and for a very high number of cycles in a fraction of the time compared to non-ultrasonic fatigue testing methods (days compared to months or years). This work presents the current status of ultrasonic fatigue testing machines working at a frequency of 20 kHz to date, with emphasis on multiaxial fatigue and very high cycle fatigue. Special attention will be put into the performance of multiaxial fatigue tests of classical cylindrical specimens under tension/torsion and flat cruciform specimens under in-plane bi-axial testing using low cost piezoelectric transducers. Together with the description of the testing machines and associated instrumentation, some experimental results of fatigue tests are presented in order to demonstrate how ultrasonic fatigue testing can be used to determine the behaviour of a steel alloy from a railway wheel at very high cycle fatigue regime when subjected to multiaxial tension/torsion loadings.

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Garcia, Martin, Claudio A. Pereira Baptista, and Alain Nussbaumer. "Multiaxial fatigue study on steel transversal attachments under constant amplitude proportional and non-proportional loadings." MATEC Web of Conferences 165 (2018): 16007. http://dx.doi.org/10.1051/matecconf/201816516007.

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In this study, the multiaxial fatigue strength of full-scale transversal attachment is assessed and compared to original experimental results and others found in the literature. Mild strength S235JR steel is used and an exploratory investigation on the use of high strength S690QL steel and the effect of non-proportional loading is presented. The study focuses on non-load carrying fillet welds as commonly used in bridge design and more generally between main girders and struts. The experimental program includes 33 uniaxial and multiaxial fatigue tests and was partially carried out on a new multiaxial setup that allows proportional and non-proportional tests in a typical welded detail. The fatigue life is then compared with estimations obtained from local approaches with the help of 3D finite element models. The multiaxial fatigue life assessment with some of the well-known local approaches is shown to be suited to the analysis under multiaxial stress states. The accuracy of each models and approaches is compared to the experimental values considering all the previously cited parameters.

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Wu, ZR, X. Li, L. Fang, and YD Song. "Evaluation of multiaxial fatigue life prediction criteria for Ni-based superalloy GH4169." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, no. 10 (May 12, 2017): 1823–37. http://dx.doi.org/10.1177/0954406217708214.

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Fatigue tests under multiaxial loading were conducted on Ni-based superalloy GH4169 tubular specimens. The microstructures of fracture surfaces under different loading paths were compared. Several multiaxial fatigue criteria were reviewed and evaluated with multiaxial fatigue test data. The criteria of equivalent strain, maximum shear strain and Kandil–Brown–Miller provided unsatisfactory results for GH4169. Fatemi–Socie and Wu–Hu–Song parameters showed better life prediction abilities for this material. Minor modification has been introduced in Wu–Hu–Song parameter. The material constants of modified Wu–Hu–Song criterion are only dependent on torsional fatigue tests. The satisfactory prediction results based on modified Wu–Hu–Song model were obtained for GH4169.

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Karolczuk, Aleksander, and Ewald Macha. "Critical Planes in Multiaxial Fatigue." Materials Science Forum 482 (April 2005): 109–14. http://dx.doi.org/10.4028/www.scientific.net/msf.482.109.

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The paper includes a review of literature on the multiaxial fatigue failure criteria based on the critical plane concept. The criteria were divided into three groups according to the distinguished fatigue damage parameter used in the criterion, i.e. (i) stress, (ii) strain and (iii) strain energy density criteria. Each criterion was described mainly by the applied the critical plane position. The multiaxial fatigue criteria based on two critical planes seem to be the most promising. These two critical planes are determined by different fatigue damage mechanisms (shear and tensile mechanisms).

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Wang, Xiao-Wei, De-Guang Shang, Yu-Juan Sun, and Xiao-Dong Liu. "Algorithms for multiaxial cycle counting method and fatigue life prediction based on the weight function critical plane under random loading." International Journal of Damage Mechanics 28, no. 9 (February 18, 2019): 1367–92. http://dx.doi.org/10.1177/1056789519831051.

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Based on the critical plane determined by the weight function method, two algorithms for multiaxial cycle counting method are proposed by modifying the rainflow and range cycle counting methods. The proposed two algorithms can be applied to multiaxial random loading, and be suitable to any critical plane-based fatigue life prediction models, since the counted cycles or reversals are represented by the start time and end time. The proposed two algorithms are used to predict multiaxial fatigue life by the experimental data of 7075-T651 aluminum alloy, En15R steel and 7050-T7451 aluminum alloy conducted under multiaxial random loading in both high-cycle and low-cycle fatigue region. The life prediction results are in good agreement with the experimental data.

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Shatil, G., and D. J. Smith. "Life Prediction of Notched Specimens Using Multiaxial Surface and Subsurface Strain Analyses." Journal of Engineering Materials and Technology 118, no. 4 (October 1, 1996): 529–34. http://dx.doi.org/10.1115/1.2805952.

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Multiaxial fatigue life prediction analyses are applied to notched specimens subjected to high strain constant amplitude loading. The specimens are made from isotropic and anisotropic batches of the structural steel EN15R. Two sets of experimental data are used for the analyses; data from the biaxial fatigue of thin walled specimens and data from the uniaxial fatigue of hourglass specimens. The maximum strain parameter and two multiaxial fatigue approaches, the Brown-Miller and the Lohr-Ellison theories, are used to predict the fatigue life. A simple subsurface strain model is developed to overcome the geometry difference between the thin walled biaxial specimens and the solid bar notched specimens. Fairly good life prediction is obtained with the multiaxial fatigue parameters and the subsurface model using elastic-plastic finite element simulations.

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Wei, Haoyang, Jie Chen, Patricio Carrion, Anahita Imanian, Nima Shamsaei, Nagaraja Iyyer, and Yongming Liu. "Multiaxial high-cycle fatigue modelling for random loading." MATEC Web of Conferences 300 (2019): 12005. http://dx.doi.org/10.1051/matecconf/201930012005.

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In this paper, a multiaxial fatigue life prediction model is proposed under general multiaxial random loadings. First, a brief review for existing multiaxial fatigue models is given and special focus is on the LiuMahadevan critical plane concept, which can be applied to both brittle and ductile materials. Next, new model development based on the Liu-Mahadevan critical plane concept for random loading is presented. The key concept is to use two-steps to identify the critical plane: identify the maximum damage plane due to normal stress and calculate the critical plane orientation with respect to the maximum damage plane due to normal stress. Multiaxial rain-flow cycle counting method with mean stress correction is used to estimate the damage on the critical plane. Equivalent stress transformation is proposed to convert the multiaxial random load spectrum to an equivalent constant amplitude spectrum. The equivalent stress is used for fatigue life prediction. Following this, experimental design and testing is performed for Al 7075-T6 under various different random uniaxial and multiaxial spectrums. The developed model is validated with both literature and in-house testing data. Very good agreement is observed for the investigated material. Finally, conclusion and future work is given based on the proposed study.

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Peng, Mengyao, Min Liu, Shuitao Gu, and Shidong Nie. "Multiaxial Fatigue Analysis of Jacket-Type Offshore Wind Turbine Based on Multi-Scale Finite Element Model." Materials 16, no. 12 (June 14, 2023): 4383. http://dx.doi.org/10.3390/ma16124383.

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The fatigue damage of a local joint is the key factor accounting for the structural failure of a jacket-type offshore wind turbine. Meanwhile, the structure experiences a complex multiaxial stress state under wind and wave random loading. This paper aims to develop a multi-scale modeling method for a jacket-type offshore wind turbine, in which local joints of the jacket are modeled in a detail by using solid elements, and other components are modeled via the common beam element. Considering the multiaxial stress state of the local joint, multi-axial fatigue damage analysis based on the multiaxial S–N curve is performed using equivalent Mises and Lemaitre methods. The uniaxial fatigue damage data of the jacket model calculated using the multi-scale finite element model are compared with those of the conventional beam model. The results show that the tubular joint of jacket leg and brace connections can be modeled using the multi-scale method, since the uniaxial fatigue damage degree can reach a 15% difference. The comparison of uniaxial and multiaxial fatigue results obtained using the multi-scale finite element model shows that the difference can be about 15% larger. It is suggested that the multi-scale finite element model should be used for better accuracy in the multiaxial fatigue analysis of the jacket-type offshore wind turbine under wind and wave random loading.

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Riess, Christian, Martin Obermayr, and Michael Vormwald. "The contrast of simplicity and accuracy in modeling multiaxial notch fatigue." MATEC Web of Conferences 300 (2019): 13003. http://dx.doi.org/10.1051/matecconf/201930013003.

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The fatigue assessment of notches under multiaxial and non-proportional service loading is challenging. Simple models (e.g. local strain approach based on normal stress and strain) are of poor quality for this general case of stress states and ductile material behavior. Advanced approaches show high accuracy, but require additional material testing and calibration. From an engineering point of view, deviations are tolerable to a certain extent. This contribution introduces two approaches for modeling multiaxial notch fatigue which are easy to apply. The first approach is an extension of the classical local strain approach. The second approach implements a simplified multiaxial notch approximation which enables the use of the extended short crack model in practical applications. A large database with experiments on notched components under multiaxial stresses is set up and used to validate the proposed algorithms. Results show the eﬀectiveness of both approaches for ductile steels. Both approaches can be useful for engineers who are faced to multiaxial fatigue of notched components.

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Li, Shan, and Yongxiang Zhao. "High-Cycle Fatigue Behavior of D2 Wheel Steel under Uniaxial and Multiaxial Loading Conditions for Potential Applications in the Railway Industry." Crystals 13, no. 7 (July 22, 2023): 1146. http://dx.doi.org/10.3390/cryst13071146.

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This study investigates the fatigue damage evolution mechanisms of D2 wheel steel under high-cycle uniaxial and multiaxial loading conditions, with a focus on determining the fatigue crack growth threshold (FCGT). Uniaxial and multiaxial FCGT tests were performed on pre-cracked D2 wheel steel specimens subjected to high-frequency cyclic loading at stress ratios (R) of 0.1. The results indicate that the FCGT for D2 wheel steel under uniaxial loading conditions ranges between 8–9 MPa.m0.5, while under multiaxial loading conditions, it ranges between 6–9 MPa.m0.5. Scanning electron microscopy analysis revealed differences in the crack propagation mechanisms between the uniaxial and multiaxial tests, with cracks deviating from their path and following the microstructure in the uniaxial tests, and cracks propagating along planes of weakness in the multiaxial tests. These findings provide insights into the high-cycle fatigue behavior of D2 wheel steel under different loading conditions for potential applications in the railway industry.

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Maslak, Tetiana, Mikhail Karuskevich, and Łukasz Pejkowski. "New Criterion for Aircraft Multiaxial Fatigue Analysis." MATEC Web of Conferences 304 (2019): 01020. http://dx.doi.org/10.1051/matecconf/201930401020.

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The complexity of analytical and experimental estimation of aircraft components fatigue life is determined by the irregular character of the load’s sequence, a number of stress concentrators, multiaxial stress state. Proposed early multiaxial fatigue criteria are aimed to reduce the complex multi axial loading to an equivalent uniaxial loading. These criteria cover different categories of metals but taking into account the wide variety of constructional materials, modes of loading, environmental conditions, the instrumental structural health monitoring looks a reasonable alternative or at least a strong complement to existing multiaxial fatigue analysis procedures. The new criterion has been proposed as a result of multi-scale levels study of metal surface transformation under fatigue.

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Alexander Araújo, José, Gabriel Magalhães Juvenal Almeida, Fábio Comes Castro, and Raphael Araújo Cardoso. "Multiaxial High Cycle Fretting Fatigue." MATEC Web of Conferences 300 (2019): 02002. http://dx.doi.org/10.1051/matecconf/201930002002.

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The aim of this work is to show that multiaxial fatigue can be successfully adpted to model fretting problems. For instance, the paper presents (i) the critical direction method, as an alternative to the critical plane concept, to model the crack initiation path under fretting conditions and (ii) studies on size effects considering the influence of incorporating fretting wear on the life estimation. A wide range of new data generated by a two actuators fretting fatigue rig considering Al 7050-T7451 and of Ti-6Al-4V aeronautical alloys is produced to validate these analyses. It is shown that, the development of appropriate tools and techniques to incorporate the particularities of the fretting phenomenon into the multiaxial fatigue problem allow an accurate estimate of the fretting fatigue resistance/life in the medium high cycle regime. Such tools and techniques can be extended to the design of other mechanical components under similar stress enviroments.

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Fernando, U. S., K. J. Miller, and M. W. Brown. "COMPUTER AIDED MULTIAXIAL FATIGUE TESTING." Fatigue & Fracture of Engineering Materials and Structures 13, no. 4 (July 1990): 387–98. http://dx.doi.org/10.1111/j.1460-2695.1990.tb00609.x.

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Journal articles on the topic 'Multiaxial fatigue'

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