Journal articles: 'Bending stress'

1

Kumar, Sachindra, Anjani Kumar Singh, Nitesh Kumar, Sushil Patel, and Ajit Kumar. "Bending Stress and Deformation Analysis of Spur Gear by Fem." Global Journal For Research Analysis 3, no. 6 (June 15, 2012): 1–5. http://dx.doi.org/10.15373/22778160/june2014/95.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Yin, Haijun, Ziqing Li, Xianwu Hao, and Baojun Zhao. "Analysis on stress state of box-girder web under prestressing effect." ITM Web of Conferences 17 (2018): 03007. http://dx.doi.org/10.1051/itmconf/20181703007.

Full text

Abstract:

In order to study the effect of prestressed box girder webs stresss state, determining the stress distribution within a web, research and analysis of vertical prestressed box girder, curved beam prestressed sensitivity under the web. Establishing the finite element model of the box girder web vertical prestressing effect is analyzed, results show that the principal tensile stress of the web is sensitive to the vertical prestress, applying the vertical prestress can effectively reduce the principal tensile stress of the web; with the decrease of the effective vertical prestress, the neutral axis above the principal compressive stress decreases rapidly, while below the neutral axis decreases relatively slow; Under the same vertical preloading stress level, the roots of cross section of the compressive stress of web reserves than L / 4 section of the web. Calculation and analysis of curved beam under bending point, different bending angles and bending radius of principal stress effect on the web, Results show that the set of curved beam web when the curved beam bending stress concentration easily, appear the main tensile stress; Increase the bending radius can effectively reduce beam cross-section of web principal tensile stress, along with the rising of the next corner, principal tensile stress peak value increases gradually, thus setting bending beam, should try to reduce the bending angle.

APA, Harvard, Vancouver, ISO, and other styles

3

Meya, Rickmer, Christian Löbbe, and A. Erman Tekkaya. "Stress State Analysis of Radial Stress Superposed Bending." International Journal of Precision Engineering and Manufacturing 20, no. 1 (January 2019): 53–66. http://dx.doi.org/10.1007/s12541-019-00040-0.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Osakue, Edward E., and Lucky Anetor. "Revised Lewis Bending Stress Capacity Model." Open Mechanical Engineering Journal 14, no. 1 (July 31, 2020): 1–14. http://dx.doi.org/10.2174/1874155x02014010001.

Full text

Abstract:

Background: During operation, cylindrical gearset experiences tangential, radial, and axial (helical gears only) force components that induce bending, compressive, and shear stresses at the root area of the gear tooth. Accurate estimation of the effective bending stress at the gear root is a challenge. Lewis was the first person who attempted estimating the root bending stress of spur gears with some reasonable accuracy. Various gear standards and codes in use today are modifications and improvements of the Lewis model. Objective: This research aims at revising the Lewis model by making adjustments for dynamic loads, shear stresses, axial bending stress for helical gears, and stress concentration factor that is independent on the moment arm of tangential or axial force component. Methods: An analytical approach is used in formulating a modified formula for the root bending stress in cylindrical gears starting with the original Lewis model. Intermediate expressions are developed in the process and works from many previous authors are reviewed and summarized. The new model developed is used to estimate the root bending stress in four example gearsets of 0o to 41.41o helix angle and the results are compared with those of AGMA (American Gear Manufacturers Association) formula. Results: Analysis from the examples shows that neglecting the radial compressive stress over-estimated the root bending stress by 5.27% on average. When shear stresses are ignored, the root bending stress is under-estimated by 7.49% on average. It is important, therefore, to account for both compressive and shear stresses in cylindrical gear root bending stress. When the root bending stress estimates from the revised Lewis model were compared with AGMA results, deviations in the range of -4.86% to 26.61% were observed. The stress estimates from the revised Lewis formulae were mostly higher than those of AGMA. Conclusion: The new root bending stress model uses stress concentration factors (normal and shear) that are independent of the point of load application on the gear tooth. This decoupling of stress concentration factor from the load moment arm distinguishes the new model from AGMA formula and brings bending stress analysis in gear design in line with classical bending stress analysis of straight and curved beams. The model can be used for both normal contact ratio and high contact ratio cylindrical gears.

APA, Harvard, Vancouver, ISO, and other styles

5

Zhang, Z. T., and S. J. Hu. "Stress and residual stress distributions in plane strain bending." International Journal of Mechanical Sciences 40, no. 6 (June 1998): 533–43. http://dx.doi.org/10.1016/s0020-7403(97)00075-1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Dezi, Luieino, and Lando Mentrasti. "Nonuniform Bending‐Stress Distribution (Shear Lag)." Journal of Structural Engineering 111, no. 12 (December 1985): 2675–90. http://dx.doi.org/10.1061/(asce)0733-9445(1985)111:12(2675).

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Hasan, Nazmul. "Allowable Bending Fatigue Stress of Rails." Practice Periodical on Structural Design and Construction 20, no. 2 (May 2015): 04014033. http://dx.doi.org/10.1061/(asce)sc.1943-5576.0000228.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Wan, Frederic Y. M. "Stress boundary conditions for plate bending." International Journal of Solids and Structures 40, no. 16 (August 2003): 4107–23. http://dx.doi.org/10.1016/s0020-7683(03)00220-8.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Koziol, Piotr. "Analytical approximation of rail bending stress." MATEC Web of Conferences 148 (2018): 05002. http://dx.doi.org/10.1051/matecconf/201814805002.

Full text

Abstract:

Phenomena associated with railway dynamics are usually analysed by using numerical approaches due to high computational complexity of such systems. However, classical methods based on analytical modelling are still highly valued and desirable by researchers and railway industry. This paper presents analytical solution representing dynamic response of railway track due to moving train in the case of nonlinear foundation. In published papers, one can find analyses of various characteristics such as velocity and acceleration of vibrations of track layers or bending moments of rails. The approach applied in this paper uses the Fourier transform combined with wavelet based approximation applied to the systems of infinitely long beams. The system of Euler-Bernoulli beams resting on viscoelastic foundation represents two-layer model (or one-layer model) of railway track, commonly used in engineering studies. It is shown that although both methods give good results for displacements, analysis of other characteristics, involving derivatives of higher orders, might lead to wrong results, even in the linear case. Possible reasons of this problem are pointed out. Some modifications of the known dynamic railway track models are proposed for further work.

APA, Harvard, Vancouver, ISO, and other styles

10

Mojumder, Soumyajit, Hang Su, Cong Qiu, Peter Mutton, Aparna Singh, and Wenyi Yan. "The role of bending stress on the initiation of reverse transverse defects." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 235, no. 1 (February 10, 2020): 61–72. http://dx.doi.org/10.1177/0954409720904329.

Full text

Abstract:

This paper investigated the role of longitudinal reverse bending stress on the initiation of reverse transverse defects. The longitudinal reverse bending stress occurs due to the reverse bending of the rail between two-wheel passage leading to the generation of tensile bending stress at the railhead and the lower head areas. The longitudinal bending stress was investigated as part of a parametric study on the rail cant angle, rail stiffness, lateral-to-vertical load ratio, and rail profile. A finite element model was created by using ABAQUS to analyze the extent of reverse bending in rails with respect to the chosen set of parameters. Under different lateral-to-vertical load ratios of 0, 0.3, 0.5, and 0.7, the maximum stress at the rail lower gauge corner was found to vary between 14.57MPa and 15.47MPa under the reverse bending condition. Similarly, low values of tensile stress under the reverse bending scenario were observed with changes in the rail cant angle and axle spacing with respect to different coal and iron ore wagons. The results revealed that the magnitude of the bending stress under different conditions of reverse bending was not significant enough to initiate a crack at the lower gauge corner.

APA, Harvard, Vancouver, ISO, and other styles

11

Joudaki, Jalal, and Mohammad Sedighi. "Effect of material's behavior on residual stress distribution in elastic–plastic beam bending: An analytical solution." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 231, no. 4 (July 31, 2015): 361–72. http://dx.doi.org/10.1177/1464420715597953.

Full text

Abstract:

A considerable residual stress distribution can be produced while bending of parts. This stress distribution depends on material behavior. In this article, residual stress distribution has been determined through the thickness in beam bending. For three different models of elastic–plastic behavior, the stress distribution and maximum residual stress are derived analytically. The residual stress is compared for three different bending radii as a case study. Also, finite element analysis has been carried out for two material properties. The results show that material behavior has little effect on stress distribution for large value of bending radius. As the bending radius decreases, difference of stress distribution increases rapidly among three plastic behaviors. Comparing the results of finite element and analytical stress distribution shows good accuracy for suggested formulations.

APA, Harvard, Vancouver, ISO, and other styles

12

Ma, Liang, and Jinan Gu. "3D bending simulation and mechanical properties of the OLED bending area." Open Physics 18, no. 1 (August 3, 2020): 397–407. http://dx.doi.org/10.1515/phys-2020-0165.

Full text

Abstract:

AbstractDue to the poor mechanical properties of traditional simulation models of the organic light-emitting device (OLED) bending area, this article puts forward a finite element model of 3D bending simulation of the OLED bending area. During the model construction, it is necessary to determine the viscoelastic and hyperelastic mechanical properties, respectively. In order to accurately obtain the stress changes of material deformation during the hyperelasticity determination, a uniaxial tensile test and a shear test were used to obtain data and thus to characterize the hyperelastic properties. In order to measure the viscoelasticity, a stress relaxation test was used to draw the stress relaxation curve, so as to characterize the viscoelastic properties. Then, the plane or axisymmetric stress–strain analysis was achieved, and the material parameters of the 3D model of the OLED bending area were obtained. Finally, the 3D model was applied to the 3D bending of the OLED bending area. Combined with the axisymmetric finite element analysis method, the 3D bending simulation finite element model of the OLED bending area was constructed by dividing the finite element mesh. Experimental results show that the mechanical properties of the proposed model are better than those of traditional OLED bending simulation models. Meanwhile, the proposed model has stronger application advantages.

APA, Harvard, Vancouver, ISO, and other styles

13

Burguete, R. L., and E. A. Patterson. "The Effect of Bending on the Normalized Stress at Roots of Threaded Connectors." Journal of Offshore Mechanics and Arctic Engineering 116, no. 3 (August 1, 1994): 163–66. http://dx.doi.org/10.1115/1.2920145.

Full text

Abstract:

Three-dimensional photoelasticity was used to analyze the effect of bending on the normalized stress at the roots of threaded connectors. Loading was effected by steel cages and a combination of eccentric weights (to provide the bending load) and concentric weights (to provide the axial load). The ratio of the bending stress to the axial stress was determined and various levels of this stress ratio, Rσ, were tested. The connections were analyzed by taking thin slices in the plane of bending and perpendicular to it. The position of the maximum fringe order at the roots was determined using Mesnager’s theorem and the maximum fringe order found by Tardy compensation. The fringe orders were normalized using the nominal axial stress and the total nominal stress (bending plus axial stress), which were calculated from the loads applied. The results, when normalized using the nominal axial stress and compared to those in connections without bending, exhibit a lower and broader peak of normalized stress values plotted against the helix length. The normalized stress values are also periodic in relation to the bending plane due to the variation in stress around the longitudinal axis of the bolt. It was found that bending in connectors will affect the normalized stress and that it is possible to determine this effect in a similar way to the method used for axially loaded connections.

APA, Harvard, Vancouver, ISO, and other styles

14

Weinrich, Andres, Nooman Ben Khalifa, Sami Chatti, Uwe Dirksen, and A. Erman Tekkaya. "Springback Compensation by Superposition of Stress in Air Bending." Key Engineering Materials 410-411 (March 2009): 621–28. http://dx.doi.org/10.4028/www.scientific.net/kem.410-411.621.

Full text

Abstract:

In the sheet metal processing industry bending is one of the common metal forming processes. Depending on the process state, a differentiation has to be made between free bending (air bending) in the die and coining (die bending). Because of its flexibility the air bending process is nowadays one of the widely applied processes for sheet metal bending, but the springback phenomenon is still a great challenge for the industrial application. At the Institute of Forming Technology and Lightweight Construction (IUL) of the Technische Universität Dortmund, Germany, a new method has been developed allowing the compensation of springback effects in air bending of sheet metals. This method is based on the incremental and local superposition of stresses in the forming zone. The superposition occurs after the bending operation but before unloading along the sheet metal width. The advantage of this new method is that a minimal force is required to compensate the springback. This paper describes the springback compensation method in detail and presents first experimental results.

APA, Harvard, Vancouver, ISO, and other styles

15

Zhang, Xide, Chengyi Zou, and Xiaoqi Yin. "An Experimental Study on Cold-Bending Stress and Its Reverse-Coupling Effect with the Uniform Load on Cold-Bent SGP Laminated Glass." Applied Sciences 11, no. 21 (October 27, 2021): 10073. http://dx.doi.org/10.3390/app112110073.

Full text

Abstract:

SentryGlas® Plus (SGP) laminated glass is a novel type of safety glass with high strength and stiffness. On the other hand, cold bending is a novel technique to build curved glass curtain walls, and is advantageous in terms of its greater energy efficiency and cost-effectiveness as well as its simple construction processes. The cold bending of SGP laminated glass could result in broad applications for the material and provide huge economic benefits in the field of glass curtain wall construction. To study cold-bending stress and its reverse-coupling effect with the uniform load in SGP laminated glass panels, single-corner cold-bending tests, uniform load tests, and ultimate capacity tests were conducted on eight pieces of such panels with different cold-bending curvatures and interlayer thicknesses. The results revealed that cold-bending stress in the glass panels under single-corner cold bending demonstrated a saddle-shaped distribution, with the maximum and second-largest cold-bending stresses located near the corner of the short side and the long side adjacent to the cold-bending corner, respectively. The cold-bending stress and coupling stress increased nonlinearly as the cold-bending curvature rose and the interlayer thickness became greater. Moreover, cold-bending curvature was a factor that affected the cold-bending stress and coupling stress more significantly than the interlayer thickness. The ultimate capacity and ultimate deflection of the glass panels decreased as the cold-bending curvature and interlayer thickness grew.

APA, Harvard, Vancouver, ISO, and other styles

16

Tao, Liu, Huang Zhi, Zheng Zhigang, Hong Shaoyou, Li Jia, Li Youzhi, and Huang Hong. "Artificial Frozen Soil Bending Test and Bending Property." E3S Web of Conferences 165 (2020): 03028. http://dx.doi.org/10.1051/e3sconf/202016503028.

Full text

Abstract:

Artificial freezing ground method has been widely used in tunnels, metro and other projects, in the connecting passage in metro, the artificial frozen soil wall, which is formed by artificial freezing method, is often used as temporary support. The artificial frozen soil wall is in the joint action of pressure and bending moment, for it takes the upper pressure and lateral earth pressure at same time, so there may be tensile stress in the profile, which may cause brittle failure. At present, some scholars have carried out researches on the tensile strength with different test methods, but they are insufficiency and have a certain difference in stress state between the specimen and the actual support structure. A bending test instrument was designed and manufacture, which satisfies the code’s requirements, and reduces the error caused by poor contact between the specimen and loading device. Bending test on artificially frozen soils was launched using this instrument, and the test on influence law of moisture content and freezing temperature on artificially frozen soils’ strength was also launched. The conclusions can provide a reference for design and construction.

APA, Harvard, Vancouver, ISO, and other styles

17

Zhang, Xide, Wei Zhou, and Mingcai Xu. "Experimental Study on Single Corner Cold Bending Mechanical Response of Laminated of PVB Interlayer Tempered Glass Panes and the Coupling Effect with Load." Materials 14, no. 22 (November 16, 2021): 6914. http://dx.doi.org/10.3390/ma14226914.

Full text

Abstract:

The cold bending method is a type of curved glass curtain wall construction method that has been used in practical engineering for a short time. It has the advantages of simple operation, high efficiency and low cost. However, the mechanical response and properties of glass panes caused by cold bending have not been solved effectively. To study the mechanical response and the properties of cold formed laminated tempered glass panes after applying with a wind load, cold bending and load tests of 9 laminated tempered glass panes were conducted by the orthogonal experimental design method. The effects of cold bending curvature, glass pane thickness and interlayer thickness were considered. In this paper, the response law of cold bending stress to the curvature and the relationship among the influencing factors were analyzed. The variation process of stress, the deflection of cold-formed glass panes under uniform load and the characteristics affected by cold-formed stress and deformation were studied. The results show that the cold bending stress is distributed in a saddle shape, and the curvature has the greatest influence on the cold bending stress, followed by the thickness of the glass panes. The influence of the interlayer thickness is small. The maximum stress appears near the corner of the short side direction adjacent to the cold bending corner. The cold bending stress increases linearly with increasing cold bending curvature. The cold bending stress and deformation have little effect on the change process of the later stage load effect.

APA, Harvard, Vancouver, ISO, and other styles

18

Wang, Chong, Xufeng Li, Yafeng Li, Wenhao Xu, and Wuyi Liao. "Analysis of the Effect of Whirl on Drillstring Fatigue." Shock and Vibration 2021 (February 22, 2021): 1–12. http://dx.doi.org/10.1155/2021/6666767.

Full text

Abstract:

There are many kinds of vibration forms of drillstring in petroleum drilling. Whirl is one of the main vibration modes when drilling tools are drilling, and it is also the main reason of fatigue failure of the drillstring. In this paper, the causes of drillstring whirl are analyzed. The results show that the speed of rotation (RPM) is a major factor that affects the severity of the whirl. The greater the speed of rotation, the more intense the whirl. The whirl of the drillstring will produce bending stress. The severity of the whirl of the drillstring is the main factor affecting the bending stress. The increase of RPM and weight on bit (WOB) will lead to the increase of bending stress. The RPM has a great influence on the bending stress. Given the complex stress condition of drillstring, the calculation model of safety factor is established. The bending stress and safety factor are calculated under the different WOB and RPM. The relationship between dynamic bending stress and the safety factor of drilling tools is analyzed. Bending stress has great influence on the safety factor of drillstring. The variation trend of safety factor is opposite to that of bending stress caused by whirl. It provides a theoretical reference for the optimization of drilling tools in drilling engineering construction.

APA, Harvard, Vancouver, ISO, and other styles

19

Bao, Ke, Ri Dong Liao, and Zheng Xing Zuo. "Stress Calculation of Fillet Rolled Crankshaft in Bending Fatigue Tests." Applied Mechanics and Materials 44-47 (December 2010): 2798–804. http://dx.doi.org/10.4028/www.scientific.net/amm.44-47.2798.

Full text

Abstract:

The stresses around the fillet of fillet rolled crankshaft section in bending fatigue test are quite complicated, which include the residual stresses induced by fillet rolling process and bending stresses caused by bending fatigue test loads. In this paper, the corresponding three dimensional finite element models of roller- shaft are created and the residual stresses near the fillet of crankshaft section are obtained by flexible-flexible contact computation. Then the transient analysis of bending fatigue test based on modal superposition method is carried out and the bending stresses are got. The results of stress can be used to the bending fatigue design of crankshafts.

APA, Harvard, Vancouver, ISO, and other styles

20

Chatti, Sami, Andres Weinrich, Mohamed El Budamusi, Christoph Becker, Frauke Maevus, and A. Erman Tekkaya. "Influencing the Forming Limits in Air Bending Using Incremental Stress Superposition." Key Engineering Materials 651-653 (July 2015): 1602–7. http://dx.doi.org/10.4028/www.scientific.net/kem.651-653.1602.

Full text

Abstract:

High springback and limited forming limits of modern high strength steels are a big challenge in manufacturing engineering. Both aspects are crucial in sheet metal bending processes. Different modifications of the air bending process have already been developed in order to reduce springback and also to increase the forming limits of materials. The innovative process of incremental stress superposition on air bending, developed at the IUL, is an alternative to conventional processes. Studies of this new process alternative show a positive effect on the considerable reduction of the sheet metal springback and extension of forming limits. Using the principle of incremental stress superposition leads to several advantages compared to conventional bending processes like die bending, bending with an elastomer tool, or three point bending. The bending force and, therefore, the consumed energy during air bending with incremental stress superposition are much lower. This paper presents the new process alternative and shows the latest investigation results.

APA, Harvard, Vancouver, ISO, and other styles

21

Huang, Zhong Hang, and Bo Tang. "Study on Face Gear's Bending Stress Based on Test and Finite Element Analysis Method." Applied Mechanics and Materials 86 (August 2011): 574–78. http://dx.doi.org/10.4028/www.scientific.net/amm.86.574.

Full text

Abstract:

For limited condition, the strain gauge was not fixed on the place of the maximum bending stress during the test of the face gear's bending stress in the research of face gear transmission stress analysis. The maximum bending stress was worked out through the finite element analysis method. The results of Finite Element Analysis (FEA) had the equivalent stress in corresponding position with the face gear tested. Then, by comparing the finite element results with the test results and the theoretical maximum stress, FEA was found approaching to the reality, and it provided a method for the analysis of face gear’ maximum bending stress.

APA, Harvard, Vancouver, ISO, and other styles

22

Thomas, Benny, K. Sankaranarayanasamy, S. Ramachandra, and SP Suresh Kumar. "Search method applied for gear tooth bending stress prediction in normal contact ratio asymmetric spur gears." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, no. 24 (January 18, 2018): 4647–63. http://dx.doi.org/10.1177/0954406217753235.

Full text

Abstract:

Various analytical methods have been developed by designers to predict gear tooth bending stress in asymmetric spur gears with an intention to improve the accuracy of predicted results and to reduce the need for time consuming finite element analysis at the early stages of gear design. Asymmetry in the drive and coast side of asymmetric spur gears poses difficulty in direct application of well-known procedures like American Gear Manufacturers Association and International Organization for Standardization in the prediction of gear tooth bending stress. In earlier works, ISO-6336-3 methodology was suitably modified and adapted to predict asymmetric spur gear tooth bending stress. This approach is based on certain assumptions on the location of critical section which could introduce error in the predicted maximum bending stress. The present work is to analytically predict gear tooth bending stress in normal contact ratio asymmetric spur gears based on a more rigorous analytical approach. This includes a fundamental study on the gear tooth orientation used to define the coordinate system, determination of maximum bending stress by search along the fillet profile and to obtain stress profile along the fillet. Gear tooth bending stress obtained from the present work using Search method is compared against the results obtained from earlier adapted International Organization for Standardization method and Finite Element Analysis. This study recommends a new coordinate system and method for analytical prediction of gear tooth bending stress in normal contact ratio asymmetric spur gears.

APA, Harvard, Vancouver, ISO, and other styles

23

Dong, Yu Li, Yuan Yuan Fang, and Jun Li Lv. "Shear-Lag Effects in Three-Span Continuous Box Girder." Applied Mechanics and Materials 90-93 (September 2011): 2696–704. http://dx.doi.org/10.4028/www.scientific.net/amm.90-93.2696.

Full text

Abstract:

The physical explanation of shear lag is given in this paper. The shear lag effects can be attributed to the abrupt change of shear stress at web-flange junction. The abrupt change at the junction of shear stresses changes the magnitude of the flange bending stresses, which attenuates gradually with increasing distances from the web. Meanwhile, the abrupt change of shear stresses from zero to the flange shear stress also influences the bending stress state at the centerline of the flange. The method to determine the shear lag effects has been given, which is based on the Euler-Bernoulli elementary theory of bending, and the calculated results are in good agreement with the experimental results. Considering the transversal distribution of the shear stress at the junction, the flange real bending stress could be calculated on the section. The change of the shear stresses decreases the magnitude of the bending stresses in tension, but increases the magnitude of the bending stresses in compression. The shear lag effects in continuous box girder are different from that in the simply supported box girder. The reaction force of the continuous support would generate an abrupt change of the shear forces between the two sides of the support, and the real bending stresses beside the support would vary significantly due to shear lag effects. The ratio of real bending stress to standard bending stress is not the proper index to reflect the shear lag effects, but the real bending stresses could represent the shear lag effects and should be paid more attention to in design.

APA, Harvard, Vancouver, ISO, and other styles

24

Bao, Ke, and Ri Dong Liao. "Bending Fatigue Life Prediction of Fillet Rolled Crankshafts." Applied Mechanics and Materials 275-277 (January 2013): 174–78. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.174.

Full text

Abstract:

The influence of residual stesses must be considered in bending fatigue life prediction of fillet rolling crankshafts. In this paper, the stress/strain distributions near fillet during fatigue tests are calculated by finite element method. In residual stress computation, the three dimensional flexible contact model is adopted, and in bending strain computation, the static analysis are selected. Then, bending fatigue life prediction is performed by local stress-strain approach based on the residual stess and bending strain amplitude, and the results agree with the bending fatigue test.

APA, Harvard, Vancouver, ISO, and other styles

25

Zhao, K. M., and J. K. Lee. "Generation of Cyclic Stress-Strain Curves for Sheet Metals." Journal of Engineering Materials and Technology 123, no. 4 (July 24, 2000): 391–97. http://dx.doi.org/10.1115/1.1395021.

Full text

Abstract:

The main objective of this paper is to obtain the first few stress-strain loops of sheet metals from reverse loading so that the springback can be simulated accurately. Material parameters are identified by an inverse method within a selected constitutive model that represents the hardening behavior of materials subjected to a cyclic loading. Three-point bending tests are conducted on sheet steels (mild steel and high strength steel). Punch stroke, punch load, bending strain, and bending angle are measured directly during the tests. Bending moments are then computed from these measured data. Bending moments are also calculated based on a constitutive model. Normal anisotropy and nonlinear isotropic/kinematic hardening are considered. Material parameters are identified by minimizing the normalized error between two bending moments. Micro-genetic algorithm is used in the optimization procedure. Stress-strain curves are generated with the material parameters found in this way, which can be used with other plastic models.

APA, Harvard, Vancouver, ISO, and other styles

26

Dong, Yu Li, Guang Yi Liu, and Jun Li Lv. "Calculation of Shear Lag in Cantilever Box Girder with Constant Depth." Applied Mechanics and Materials 94-96 (September 2011): 679–85. http://dx.doi.org/10.4028/www.scientific.net/amm.94-96.679.

Full text

Abstract:

The physical explanations both of positive or negative shear lag are given in this paper. The shear lag effects occur attributing to the abrupt change of shear stress at junction upper the web. The abrupt change of shear stress or called shear stress jump changes the stress magnitude of the flange bending stress, which attenuates gradually at increasing distances from the web. Meanwhile, the abrupt change of shear stress from zero to the flange shear stress also influences the bending stress state at the centerline of the slab. The method to determine the shear lag has given, which is based on the Euler-Bernoulli elementary theory of bending. Considering the transversal distribution of the shear stress at the junction upper the web, the real flange bending stress could be calculated all on the section.

APA, Harvard, Vancouver, ISO, and other styles

27

Wang, Xiyu, Chuan Tang, Lin Liu, Yang Wang, Linmao Qian, and Lei Chen. "Development of a bending-stress-controllable micro-clamp and applications in nanowear study of polyimide terephthalate." Review of Scientific Instruments 93, no. 12 (December 1, 2022): 123706. http://dx.doi.org/10.1063/5.0119394.

Full text

Abstract:

Inner stress that exists in most natural and artificial materials, such as rocks, coatings, glasses, and plastic products, has a significant impact on their tribological properties at any length scale. Here, we designed a bending-stress controllable micro-clamp that can be applied in a high-vacuum atomic force microscope with limited chamber space for the investigation of stress-dependent nanowear behavior. By accurately quantifying the bending degree of the sample in different directions, the mutual transformation and adjustment of tensile or compressive stress could be realized. The stability of the micro-clamp structure was further verified by simulating the bending deformation state of the sample through Ansys calculations. The maximum applied scratch area on the bended sample surface where the variation of bending-induced stress below 5% was defined by the Ansys simulations. The consistency of polyimide terephthalate (PET) wear inside this defined region under both bending-free and bending states verified the stability and reliability of micro-clamp. Finally, the designed micro-clamp was applied to study the effect of bending deformation on friction and wear of PET in the atomic force microscope tests, where the tensile stress generated with bending deformation was found to facilitate the nanowear of PET material sliding against a diamond probe.

APA, Harvard, Vancouver, ISO, and other styles

28

Guo, Hong Qiang, Hua Li, Yi Chen Sun, and Wei Wei Yu. "Bending Ratcheting Behavior of Zircaloy-4 Alloy at Room Temperature." Advanced Materials Research 690-693 (May 2013): 1713–17. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.1713.

Full text

Abstract:

In this paper, a series of bending cyclic tests under stress controlled were conducted at room temperature on Zircaloy-4 (Zr-4) to investigate its bending ratcheting behavior. The effects of mean stress and stress amplitude on the bending ratcheting behavior were experimentally studied, respectively. The experimental results show that the ratcheting strain of the material is very sensitive to mean stress and stress amplitude. It can be concluded that ratcheting strain level increases with increasing mean stress and stress amplitude.

APA, Harvard, Vancouver, ISO, and other styles

29

Peng, J. F., X. Jin, Z. B. Xu, Z. B. Cai, X. Y. Zhang, and M. H. Zhu. "Study on bending fretting fatigue damage in 17CrNiMo6 steel." International Journal of Modern Physics B 31, no. 16-19 (July 26, 2017): 1744020. http://dx.doi.org/10.1142/s0217979217440209.

Full text

Abstract:

Bending fretting fatigue behavior of 17CrNiMo6 alloy structural steel at room temperature was investigated under different bending and contact loads; and the [Formula: see text]–[Formula: see text] curve also was built up. The results showed that the [Formula: see text]–[Formula: see text] curve had a “C” shape. The bending fretting fatigue life was mainly dependent on the bending fatigue stress and fretting displacement. The limit of the specimens and the fretting fatigue life were dramatically decreased by fretting actions. The bending fretting fatigue damage changed under varied bending fatigue stress levels. When the wear first occurred, there is a lower bending fatigue stress; and with a higher bending fatigue load, microcracks were generated. However, some serious wear and surface delamination were observed under the highest fatigue load.

APA, Harvard, Vancouver, ISO, and other styles

30

Ha, Hong Soo, Sang Cheol Kim, Dong Woo Ha, Sang Soo Oh, and Jin Ho Joo. "The Effect of Deformation Stress-Strain and Temperature on The I_c Degradation of Bi-2223/Ag Tapes." Materials Science Forum 534-536 (January 2007): 1609–12. http://dx.doi.org/10.4028/www.scientific.net/msf.534-536.1609.

Full text

Abstract:

Bi-2223/Ag tapes are usually used for superconducting power cables and magnets. Bi- 2223 ceramic superconducting core can be damaged under complicated stress and strain conditions such as winding tension, bending and twisting. In this study, we have presented the effect of axial stress and bending strain on the superconducting properties of Bi-2223/Ag tapes. In order to establish the value for 95% retained Ic of the Bi-2223/Ag tapes under various stress-strain conditions, the tension apparatus with bending former was used to apply the tension and bending stress-strain. Tension and bending stress-strain simultaneously applied to the tapes could reduce the critical current even though each applied stress and strain values were not higher than that of 95% retained Ic of the tapes. Complex stress-strain conditions including the thermal stress-strain have accelerated the degradation of the Bi-223/Ag tapes. The deformation temperature was important to maintain the 95% retained Ic of the Bi-2223/Ag tapes after bending or tension deformation because mechanical strength of the tapes can be changed drastically between room temperature and 77 K.

APA, Harvard, Vancouver, ISO, and other styles

31

Luo, Ming Zhi, Jia Zheng Du, and Wan Lin Cao. "Study on Strength and Stiffness of Special-Shaped SRC Columns." Applied Mechanics and Materials 226-228 (November 2012): 1015–18. http://dx.doi.org/10.4028/www.scientific.net/amm.226-228.1015.

Full text

Abstract:

SRC (Steel Reinforced Concrete) columns have a very broad application in the construction industry, and their cross-section combined forms are becoming more and more diverse. To solve the strength and stiffness problem of special-shaped SRC columns fast and accurately, the formulas of bending stress and bending deflection of special-shaped SRC columns were derived based on plane assumption from the bending experiments of SRC columns. For the problem with a eccentric force, the formula of normal stress from axial force was derived and added to the bending stress. Based on the formulas, the program is implemented to calculate the bending stress and bending deflection of special-shaped SRC columns. The example results showed the formulas are simple and reliable, and have certain engineering meanings and theoretical value.

APA, Harvard, Vancouver, ISO, and other styles

32

Ong, L. S. "Allowable Shape Deviation in a Pressurized Cylinder." Journal of Pressure Vessel Technology 116, no. 3 (August 1, 1994): 274–77. http://dx.doi.org/10.1115/1.2929587.

Full text

Abstract:

Presence of initial shape imperfection causes additional bending stresses to be developed in a pressurized cylinder. Although the bending stress will initially increase with pressure, it will finally settle down to a certain value. This article derives the maximum bending stress associated with the geometric shape imperfection. It also discusses the implication of this additional bending stress on the design stress and allowable shape tolerance. Finally, it is concluded that a 1-percent diametral deviation, as commonly specified by most design codes, is adequate and sound for the internally pressurized cylinder.

APA, Harvard, Vancouver, ISO, and other styles

33

LIU Zheng-zhou, 刘正周, 廖敦明 LIAO Dun-ming, 贾永臻 JIA Yong-zhen, 张. 博. ZHANG Bo, 吴. 棣. WU Di, and 陈继峯 CHEN Ji-feng. "Stress simulation of foldable OLED screen bending." Chinese Journal of Liquid Crystals and Displays 33, no. 7 (2018): 555–60. http://dx.doi.org/10.3788/yjyxs20183307.0555.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Buffett, B. A., and T. W. Becker. "Bending stress and dissipation in subducted lithosphere." Journal of Geophysical Research: Solid Earth 117, B5 (May 2012): n/a. http://dx.doi.org/10.1029/2012jb009205.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Mujahid, Ahmad Syafiul, and Wibowo Harso Nugroho. "Analisa Bending Stress Pada Submerged Floating Tunnel." Wave: Jurnal Ilmiah Teknologi Maritim 4, no. 1 (May 20, 2019): 1. http://dx.doi.org/10.29122/jurnalwave.v4i1.3536.

Full text

Abstract:

Perhitungan dengan pemodelan Submerged Floating Tunnel (SFT) dengan menggunakan perangkat lunak berbasis metode elemen hingga. Analisa struktur terowongan apung menggunakan prinsip kerja dengan mendiskripsikan seluruh beban (force) pada SFT berupa beban internal dan eksternal yang bekerja akan diperoleh momen reaksi yang terjadi sepanjang badan SFT, dengan mengetahui luas penampang melintang SFT maka dapat diperoleh bending stress di seluruh badan SFT.Keywords : submerged floating tunnel (SFT), bending stress, structural analysis

APA, Harvard, Vancouver, ISO, and other styles

36

Zoli, Marco. "Twisting and bending stress in DNA minicircles." Soft Matter 10, no. 24 (2014): 4304. http://dx.doi.org/10.1039/c3sm52953c.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

TAMURA, Shintaro, and Atsushi HASHIMOTO. "601 Bottle Cutting by Utilizing Bending Stress." Proceedings of Autumn Conference of Tohoku Branch 2007.43 (2007): 149–50. http://dx.doi.org/10.1299/jsmetohoku.2007.43.149.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Yeh, Meng-Kao, Li-Yu Chang, Min-Ru Lu, Hsien-Chie Cheng, and Pi-Hsien Wang. "Bending stress analysis of flexible touch panel." Microsystem Technologies 20, no. 8-9 (May 10, 2014): 1641–46. http://dx.doi.org/10.1007/s00542-014-2200-1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Tsou, A. H., J. Greener, and G. D. Smith. "Stress relaxation of polymer films in bending." Polymer 36, no. 5 (March 1995): 949–54. http://dx.doi.org/10.1016/0032-3861(95)93593-b.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Roche, D., C. Richard, L. Eyraud, and C. Audoly. "Shear stress sensor using piezoelectric bimorphs bending." Ultrasonics 34, no. 2-5 (June 1996): 147–51. http://dx.doi.org/10.1016/0041-624x(95)00092-h.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Roberts, Margaret. "Bending, but not breaking: Planners under stress." Planning Practice and Research 3, no. 6 (December 1988): 19–23. http://dx.doi.org/10.1080/02697458808722714.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Chen, Kejia, and Steve Granick. "Bending Modulus Dictates GUV Response to Stress." Biophysical Journal 106, no. 2 (January 2014): 89a. http://dx.doi.org/10.1016/j.bpj.2013.11.564.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Teixeira de Freitas, João António, and Carlos Tiago. "Hybrid‐Trefftz stress elements for plate bending." International Journal for Numerical Methods in Engineering 121, no. 9 (May 15, 2020): 1946–76. http://dx.doi.org/10.1002/nme.6294.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Kant, Tarun, Yogesh Desai, and Sandeep Pendhari. "Stress analyses of laminates under cylindrical bending." Communications in Numerical Methods in Engineering 24, no. 1 (November 7, 2006): 15–32. http://dx.doi.org/10.1002/cnm.952.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Laakkonen, Markus, Theo J. Rickert, and Lasse Suominen. "Stress Measurements in Glass and Plastic by Optical Hole-Drilling." Materials Science Forum 768-769 (September 2013): 95–100. http://dx.doi.org/10.4028/www.scientific.net/msf.768-769.95.

Full text

Abstract:

Quantitative residual stress depth profile measurements are common in metallic parts but not in glass or plastic. This paper describes some experimental stress depth profile measurements using hole-drilling with electronic speckle pattern interferometry (ESPI) in two types of glasses and two thermoplastics. Stress depth profiles in laminated and toughened glass specimens show the expected low stresses in the former and significant compressive stresses near the surface in the latter for the as-is condition. The stress curves shift towards tensile stresses during slight bending deformation, as expected. The bending devices initially used for experiments with Bayblend® and Makrolon® were deforming the specimens too severely to allow proper, static, measurements. Significant stress reductions due to creep were measured for extended bending times. Subsequent measurements for less severe bending show similar stress curve characteristics. Residual stresses in the as-is condition apparently account for some of the differences to the predicted bending stress profile.

APA, Harvard, Vancouver, ISO, and other styles

46

Zhang, Yang, and Zhi Ming Yu. "Predicted Model of Section Stress Distribution and Bending Strength of Fiberboard Based on Vertical Density Profile." Materials Science Forum 704-705 (December 2011): 424–33. http://dx.doi.org/10.4028/www.scientific.net/msf.704-705.424.

Full text

Abstract:

To study the impact of VDP on the bending process of fiberboard, this paper deeply researched into the dynamic changes of section stress distribution of fiberboard during the process of loading and bending and built a static bending strength predicting model, which is based on the piecewise function by simulating fiberboard VDP, theory of elasticity and plasticity, lamella inter-bedded theory and VDP model. The results show: The bending process of fiberboard can be divided into two stages which are elasticity period and elasticity-plasticity period. The latter includes both elasticity region and plasticity region, and compression region comes to elasticity bending before pulling region. The curve of bending section stress distribution is nonlinear and affected by loads and VDP. Critical section stress distribution of bending breakage and breakage load can be predicted by VDP with other condition unchanged. The value of static bending strength predicted by model is basically consistent with testing data. And the static bending strength is closely related to qualification factors of VDP. Fiberboard with high average density doesn’t always contain high static bending strength. VDP is a significant physical parameter which has impact on the bending process and performance of fiberboard, so it must be optimized and controlled in production according to for specific purpose. Key words: fiberboard, vertical density profile, section stress distribution, bending strength, predicting model

APA, Harvard, Vancouver, ISO, and other styles

47

Chen, Xu Qin, Gui Lan Jiang, and Guang Zhen Cheng. "Material Mechanical Performance about Worm Bending and Twisting Deformation for Civil Engineering." Advanced Materials Research 568 (September 2012): 187–90. http://dx.doi.org/10.4028/www.scientific.net/amr.568.187.

Full text

Abstract:

On the condition of line elastic and small deformation, more than 80% failure of the drive shaft is due to fatigue damage. It relates to the alternating stress of the drive shaft under the combination effect of bending and twisting. When drive shaft is under the combination effect of bending and twisting for civil engineering, torsion shear stress is perpendicular to bending normal stress. They can’t be simply stacked. Combining with the belt conveyor tension device of the worm transmission, first, simplify the external force; do stress analysis in horizontal plane and vertical plane respectively. Then make corresponding bending moment figure and separately calculate the internal force, stress of each basic deformation and make comprehensive bending moment figure and torque figure. Then use the application of superposition principle, the fourth strength theory to calculate worm transmission’s strength. The method makes senses to other transmission mechanism shaft bending and twisting combination strength analysis as a reference.

APA, Harvard, Vancouver, ISO, and other styles

48

Mo, Shuai, Shuai Ma, and Guoguang Jin. "Research on composite bending stress of asymmetric gear in consideration of friction." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 8 (September 4, 2018): 2939–55. http://dx.doi.org/10.1177/0954406218797975.

Full text

Abstract:

Compared with the conventional gear, the asymmetric gear has better root bending stress and tooth contact stress. Taking a pair of asymmetric involute spur gears as the research object, a model of asymmetric gear considering the influence of friction and shear stress on root bending stress is established. Take the upper boundary point of single tooth meshing area as example, the formula for calculating root bending stress of asymmetric gear is deduced under friction, get the rule of root bending stress without neglecting the friction force and the shear stress by MATLAB. At the same time, we design the plane finite element model of conventional gear (20°/20°) and asymmetric gear (20°/35°) by using APDL. The upper and lower boundary points of the double tooth meshing area, the upper and lower boundary points of the single tooth meshing area, the meshing node are systematically studied, get the change rules of root bending stress in the meshing process under the condition that the friction force cannot be ignored.

APA, Harvard, Vancouver, ISO, and other styles

49

Wen, Bao-Qin, Yang Li, Za Kan, Jing-Bin Li, Liqiao Li, Jianbing Ge, Longpeng Ding, Kaifei Wang, Shijie Zou, and Wentao Li. "Experimental Research on the Bending Characteristics of Glycyrrhiza glabra Stems." Transactions of the ASABE 63, no. 5 (2020): 1499–506. http://dx.doi.org/10.13031/trans.13802.

Full text

Abstract:

HighlightsA quadratic orthogonal rotation combination design was used to test the influences of four factors.The significant influence of each factor was obtained using the analysis of variance method.Interactions of the factors were analyzed using the response surface method.Abstract. To provide a theoretical basis for the design of harvesting and processing machinery for Glycyrrhiza glabra stems and for energy conservation during processing, the bending characteristics of G. glabra stems were studied. The comprehensive influences of four factors (loading position diameter, loading speed, span, and moisture content) on the bending characteristics of G. glabra stems were tested using a quadratic orthogonal rotation combination design. The results indicated that the single factors loading position diameter and span had a significant influence on the bending characteristics of G. glabra stems. In addition, as the loading position diameter increased, the maximum bending force and bending energy of G. glabra stems tended to increase, while the bending stress tended to decrease. As the span increased, the maximum bending force and bending energy of G. glabra stems tended to decrease, while the bending stress tended to increase. As the moisture content increased, the maximum bending force and bending stress of G. glabra stems tended to decrease, while the influence on bending energy was not significant. The loading speed had no influence on the bending characteristics of G. glabra stems. The interaction between loading position diameter and span had a significant influence on the maximum bending force and bending energy, and the interactions between loading position diameter and moisture content and between loading speed and span had a significant influence on the maximum bending stress. This study on the bending characteristics of G. glabra stems can provide a theoretical basis for the design of harvesting and processing equipment and for the pretreatment of G. glabra stems. Keywords: Bending characteristics, Licorice, Loading position, Loading speed, Moisture content, Span.

APA, Harvard, Vancouver, ISO, and other styles

50

Zhao, Layue, Robert C. Frazer, and Brian Shaw. "Comparative study of stress analysis of gears with different helix angle using the ISO 6336 standard and tooth contact analysis methods." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, no. 7-8 (March 22, 2016): 1350–58. http://dx.doi.org/10.1177/0954406216639075.

Full text

Abstract:

With increasing demand for high speed and high power density gear applications, the need to optimise gears for minimum stress, noise and vibration becomes increasingly important. ISO 6336 contact and bending stress analysis are used to determine the surface load capacity and tooth bending strength but dates back to 1956 and although it is constantly being updated, a review of its performance is sensible. Methods to optimise gear performance include the selection of helix angle and tooth depth to optimise overlap ratio and transverse contact ratio and thus the performance of ISO 6336 and tooth contact analysis methods requires confirmation. This paper reviews the contact and bending stress predicted with four involute gear geometries and proposes recommendations for stress calculations, including a modification to contact ratio factor Zɛ which is used to predict contact stress and revisions to form factor YF and helix angle factor Yβ which are cited to evaluate bending stress. The results suggest that there are some significant deviations in predicted bending and contact stress values between proposal methods and original ISO standard. However, before the ISO standard is changed, the paper recommends that allowable stress numbers published in ISO 6336-5 are reviewed because the mechanisms that initiate bending and contact fatigue have also changed and these require updating.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Bending stress'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles