Готові списки джерел за темами / Crack damage

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Добірка наукової літератури з теми "Crack damage"

Автор: Grafiati

Опубліковано: 7 червня 2025

Оновлено: 2 серпня 2025

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Статті в журналах з теми "Crack damage"

Zhang, Fan, Zhenqi Hu, Yusheng Liang, and Quanzhi Li. "Evaluation of Surface Crack Development and Soil Damage Based on UAV Images of Coal Mining Areas." Land 12, no. 4 (2023): 774. http://dx.doi.org/10.3390/land12040774.

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Coal mining is necessary for the development of society but at the same time causes ecological damage that must also be repaired based on science. In the arid and semi-arid regions of northwest China, surface cracks are one of the major geo-environmental problems caused by coal mining, and studies are urgently needed to determine how to effectively repair them in a scientific manner. The rapid development of unmanned aerial vehicle (UAV) remote sensing technology in recent years has resulted in a good source of data for acquiring feature information on surface cracks. Existing studies mainly f

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Lin, Bin, Hong Tao Zhu, Hui Wu, Z. F. Wang, and S. Y. Yu. "Evaluation and Measurement of Surface/Subsurface Crack Damage of Ground Ceramics." Materials Science Forum 471-472 (December 2004): 47–51. http://dx.doi.org/10.4028/www.scientific.net/msf.471-472.47.

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While be ground, ceramic is prone to engender surface/subsurface crack damage layer because of great grinding force and high brittle of the material. The crack damage layer was investigated in this research. In experiment, it is observed that the surface/subsurface crack damage layer consists of three kinds of cracks: surface micro-cracks, surface macro-cracks and subsurface crack system. To evaluate expediently the degree of damage to the machined components, the index of surface/subsurface crack damage - Dc, is defined.

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Chandra, N. Harish, and A. S. Sekhar. "Damage Identification and Quantification in Structures Using Wavelet Analysis." Applied Mechanics and Materials 471 (December 2013): 187–92. http://dx.doi.org/10.4028/www.scientific.net/amm.471.187.

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In this study, displacement and strain energy mode shapes obtained from the structure, are processed using continuous spatial wavelet transforms for damage identification. A cantilever and simply supported beam are analysed in ANSYS to obtain mode shapes by performing modal analysis both for damaged and undamaged conditions. Different wavelets are processed to choose the best mother wavelet for detecting crack, a representation of damage. The dimensions of crack like depth are varied from 0.5 mm. Spatial distribution of wavelet coefficients obtained is used for identifying the damage. The quan

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Guo, Qi, Zhimin Guo, Kang Fu, et al. "Characterization and Imaging of Damage during Creep Crack Growth in 2219 Aluminum Alloy." Journal of Physics: Conference Series 2437, no. 1 (2023): 012038. http://dx.doi.org/10.1088/1742-6596/2437/1/012038.

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Abstract Aluminum alloys have been extensively applied in aerospace field due to their light weight. Some research results show that creep crack growth is one of the main reasons for the failure of aluminum alloys in high temperature service environment. Micro-CT is a novel method to obtain damage information inside materials, which can quantitatively characterize the volume, quantity and distribution of damage. In this paper, the characterization method based on X-ray micro-CT is utilized to study the growth behavior of damage during creep crack growth of 2219 aluminum alloy. The results indi

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Deng, Luming, and Yulin Deng. "Study on Multi-Crack Damage Evolution and Fatigue Life of Corroded Steel Wires Inside In-Service Bridge Suspenders." Applied Sciences 14, no. 20 (2024): 9596. http://dx.doi.org/10.3390/app14209596.

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The parallel steel wires used in arch bridge suspenders experience random corrosion damage on their surfaces during service. Corrosion damage, including micro-cracks, pitting, and a combination of both, leads to significant stress concentration under axial loading, which affects the performance of the steel wires. The change in the stress field caused by surface damage alters the stress intensity factor at the crack tip, and the presence of adjacent crack tips significantly amplifies the stress intensity factor, thereby accelerating crack propagation. The development of small surface damages i

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Zhao, Bingyao, Ning Huang, Siyang Dai, and Ping Zhou. "Study of Prefabricated Crack Propagation on Monocrystalline Silicon Surfaces for Grinding Damage Analysis." Materials 17, no. 15 (2024): 3852. http://dx.doi.org/10.3390/ma17153852.

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Crack generation and propagation are critical aspects of grinding processes for hard and brittle materials. Despite extensive research, the impact of residual cracks from coarse grinding on the cracks generated during fine grinding remains unexplored. This study aims to bridge this gap by examining the propagation law of existing cracks under indentation using the extended finite element method. The results reveal that prefabricated cracks with depths less than the crack depth produced on an undamaged surface tend to extend further without surpassing the latter. Conversely, deeper prefabricate

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Tan, K. T., N. Watanabe, and Y. Iwahori. "Impact Damage Resistance, Response, and Mechanisms of Laminated Composites Reinforced by Through-Thickness Stitching." International Journal of Damage Mechanics 21, no. 1 (2011): 51–80. http://dx.doi.org/10.1177/1056789510397070.

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In this article, the study of impact damage of laminated composites reinforced by through-thickness stitching is investigated and presented in threefold. Specimens stitched with varying stitch density and stitch thread thickness are subjected to low-velocity impact via a drop-weight machine. Impact damage resistance is first studied by examining the extent of delamination area in damaged specimens using ultrasonic C-scan analysis. It is revealed that higher stitch density is more capable of impeding delamination growth by arresting cracks at closer interval and suppressing crack propagation. T

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Liang, Yusheng, Fan Zhang, Kun Yang, and Zhenqi Hu. "A Surface Crack Damage Evaluation Method Based on Kernel Density Estimation for UAV Images." Sustainability 14, no. 23 (2022): 16238. http://dx.doi.org/10.3390/su142316238.

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The development of UAV (unmanned aerial vehicle) technology provides an ideal data source for the information extraction of surface cracks, which can be used for efficient, fast, and easy access to surface damage in mining areas. Understanding how to effectively assess the degree of development of surface cracks is a prerequisite for the reasonable development of crack management measures. However, there are still no studies that have carried out a reasonable assessment of the damage level of cracks. Given this, this article proposes a surface crack damage evaluation method based on kernel den

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Gao, Ruipeng, Mengmeng Liu, Bing Wang, Yiran Wang, and Wei Shao. "Influence of Stress Intensity Factor on Rail Fatigue Crack Propagation by Finite Element Method." Materials 14, no. 19 (2021): 5720. http://dx.doi.org/10.3390/ma14195720.

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Wheel rail rolling contact fatigue is a very common form of damage, which can lead to uneven rail treads, railhead nuclear damage, etc. Therefore, ANSYS software was used to establish a three-dimensional wheel–rail contact model and analyze the effects of several main characteristics, such as the rail crack length and crack propagation angle, on the fatigue crack intensity factor during crack propagation. The main findings were as follows: (1) With the rail crack length increasing, the position where the crack propagated by mode I moved from the inner edge of the wheel–rail contact spot to the

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Fang, Zhi Hua, and Xiang Yang Liu. "Research on Recognition Methods of Crack Damage from Beam Based on the Vibration Modal." Applied Mechanics and Materials 578-579 (July 2014): 1024–27. http://dx.doi.org/10.4028/www.scientific.net/amm.578-579.1024.

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Structural crack damage will degrade its carrying capacity, and affect the security of the structure. Thus early detection of crack damage is a guarantee of the structure safety. Cracks can change the vibration characteristics of the structure, therefore we proposed a method of identifying the crack damage based on the vibration modal. Take both ends fixed beam as an example, through establish the finite element models of crack-free beam and the crack beam with different location and different depth, we calculate the displacement modal parameters of beam before and after the damage, analyze th

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Дисертації з теми "Crack damage"

俞立剛 and Ligang Yu. "Orthotropic damage models for fatigue crack initiation andpropagation." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1993. http://hub.hku.hk/bib/B31233995.

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Gualandi, Gabriele. "Crack modeling and crack propagation in structures using damage model and extended finite element techniques." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/3931/.

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Yu, Ligang. "Orthotropic damage models for fatigue crack initiation and propagation /." [Hong Kong : University of Hong Kong], 1993. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13570377.

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Zohora, Fatematuz. "Evaluation of material crack using acoustic emission technique." Thesis, Queensland University of Technology, 2016. https://eprints.qut.edu.au/94663/1/Fatematuz_Zohora_Thesis.pdf.

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Cracks in civil structures can result in premature failure due to material degradation and can result in both financial loss and environmental consequences. This thesis reports an effective technique using Acoustic Emission (AE) technique to assess the severity of the crack propagation in steel structures. The outcome of this work confirms that combination of AE parametric analysis and signal processing techniques can be used to evaluate crack propagation under different loading configurations. The technique has potential application to assess and monitor the condition of civil structures.

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Hafezi, M. H., R. Alebrahim, and T. Kundu. "Crack propagation modeling using Peridynamic theory." SPIE-INT SOC OPTICAL ENGINEERING, 2016. http://hdl.handle.net/10150/622515.

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Crack propagation and branching are modeled using nonlocal peridynamic theory. One major advantage of this nonlocal theory based analysis tool is the unifying approach towards material behavior modeling- irrespective of whether the crack is formed in the material or not. No separate damage law is needed for crack initiation and propagation. This theory overcomes the weaknesses of existing continuum mechanics based numerical tools (e.g. FEM, XFEM etc.) for identifying fracture modes and does not require any simplifying assumptions. Cracks grow autonomously and not necessarily along a prescribed

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Li, Shi. "Modeling of active crack damage control and the active fatique damage control of adhesive joint." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-08222009-040330/.

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FERREIRA, SAMUEL ELIAS. "FATIGUE CRACK PROPAGATION MODELLING BY ACCUMULATED DAMAGE INSIDE PLASTIC ZONE." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2018. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=35852@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>Após identificar que uma trinca de fadiga permanecia fechada durante parte do ciclo, Elber assumiu que o dano era induzido apenas pela fração do carregamento acima da carga necessária para abrir a trinca. Diversos modelos foram propostos utilizando o Delta Keff como força motriz da propagação, como os modelos da faixa plástica (strip-yield), que são amplamente utilizados para prever vida residual de componentes trincados. Embora o fenômeno do fechamento da trinca esteja provado, sua real importância na propagação da trinca de fadiga ainda é

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Aydogan, Mustafa Ozgur. "Damage Detection In Structures Using Vibration Measurements." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1058809/index.pdf.

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Cracks often exist in structural members that are exposed to repeated loading, which will certainly lower the structural integrity. A crack on a structural member introduces a local flexibility which is a function of the crack depth and location. This may cause nonlinear dynamic response of the structure. In this thesis, a new method is suggested to detect and locate a crack in a structural component. The method is based on the fact that nonlinear response of a structure with a crack will be a function of the crack location and crack magnitude. The method suggested is the extension of a recent

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Pape, John Andrew. "Fretting fatigue damage accumulation and crack nucleation in high strength steels." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/18382.

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Schmidt, Walter Thomas Conlon Stephen C. Smith Edward C. "Open-crack damage assessments of aluminum panels using structural intensity-based techniques." [University Park, Pa.] : Pennsylvania State University, 2009. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-4237/index.html.

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Книги з теми "Crack damage"

Carpinteri, Alberto. Mechanical damage and crack growth in concrete. Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4350-6.

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Ellyin, Fernand. Fatigue Damage, Crack Growth and Life Prediction. Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-1509-1.

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Ellyin, Fernand. Fatigue damage, crack growth, and life prediction. Chapman & Hall, 1997.

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Pete, Kantzos, Telesman Jack, and United States. National Aeronautics and Space Administration., eds. Fatigue crack growth and crack bridging in SCS-6/Ti-24-11. National Aeronautics and Space Administration, 1995.

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North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. An assessment of fatigue damage and crack growth prediction techniques. AGARD, 1994.

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1950-, Harris Charles E., and Langley Research Center, eds. Analytical methodology for predicting the onset of widespread fatigue damage in fuselage structure. National Aeronautics and Space Administration, Langley Research Center, 1996.

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Castelli, Michael G. Characterization of damage progression in SCS-6/Timetal 21S [0]₄ under thermomechanical fatigue loadings. National Aeronautics and Space Administration, 1994.

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Wanhill, R. J. H. Damage tolerance property comparisons for 2000 and 8000 series aluminium plate alloys. National Aerospace Laboratory, 1995.

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C, Newman J., and United States. National Aeronautics and Space Administration. Scientific and Technical Information Program., eds. Analysis and prediction of multiple-site damage (MSD) fatigue crack growth. National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1992.

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C, Newman J., and Langley Research Center, eds. Methodology for predicting the onset of widespread fatigue damage in lap-splice joints. National Aeronautics and Space Administration, Langley Research Center, 1998.

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Частини книг з теми "Crack damage"

Yu, Weixin, and Xiaohui Wang. "Modelling the Mechanical Behaviour of the RC Pipe Pile with Construction-Induced Damage and Cracks." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. https://doi.org/10.1007/978-981-97-6238-5_35.

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AbstractDuring the construction of the high-piled wharf, cracks may be induced in the top zone of the pre-stressed high-strength concrete pipe pile due to the high-frequency hitting. In this paper, the influence of the construction-induced damage and cracks on the mechanical properties of prestressed reinforced concrete (RC) pipe piles is studied. Finite element analysis is used to simulate the mechanical behaviour of the RC pipe piles with construction-induced damage and the corresponding ultimate bearing capacity of the damaged RC piles is predicted. Influence of different lengths of the con

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Ghosh, Bidisha, Michael O’Byrne, Franck Schoefs, and Vikram Pakrashi. "Crack detection." In Image-Based Damage Assessment for Underwater Inspections. CRC Press, 2018. http://dx.doi.org/10.1201/9781351052580-5.

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Ballatore, Enrico. "The Damage Crack Model." In Solid Mechanics and its Applications. Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4700-2_2.

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Saimoto, Akihide, A. Toyoda, and Y. Imai. "Crack Propagation under Compressive Stress Influenced by Crack Face Asperity." In Fracture and Damage Mechanics V. Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-413-8.125.

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Dormieux, Luc, and Djimédo Kondo. "Two-Dimensional Griffith Crack." In Micromechanics of Fracture and Damage. John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119292166.ch3.

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Dormieux, Luc, and Djimédo Kondo. "Griffith Crack in 3D." In Micromechanics of Fracture and Damage. John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119292166.ch5.

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Ellyin, Fernand. "Fatigue crack growth." In Fatigue Damage, Crack Growth and Life Prediction. Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-009-1509-1_7.

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Si, Jun, Fu Zhen Xuan, and Shan Tung Tu. "Creep Crack Interaction of High Temperature Structure with Multiple Cracks." In Fracture and Damage Mechanics V. Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-413-8.105.

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Sollero, Paulo. "Predictive Modeling of Crack Propagation Using the Boundary Element Method." In Damage Prognosis. John Wiley & Sons, Ltd, 2005. http://dx.doi.org/10.1002/0470869097.ch4.

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Casciati, F. "Crack Growth and Damage Accumulation." In PROBAMAT-21st Century: Probabilities and Materials. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5216-7_37.

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Тези доповідей конференцій з теми "Crack damage"

Bohnsack, G. "German Views on the Influence of Feedwater Chemistry on Crack Damage in Deaerators." In CORROSION 1986. NACE International, 1986. https://doi.org/10.5006/c1986-86301.

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Abstract Deaerator damage by crack formation has been observed in Germany on feedwater tanks constructed from soft mild steels only with superimposed deaerator. Cracks initiate where a resistance against plastic deformation combines with high load and are probably increased by thermo-mechanical stresses. If pitting corrosion is observed, the cracks form initially on the bottom of pits. The heat-influenced zone near a weld has a higher hardness when high strength steels are used as construction material than with normal mild steels. Hydrogen generated during formation of the protective magnetit

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Curtin, Thomas, Sharon Mellings, and Robert Adey. "Macroscale Modeling Solutions for Integrity Assessment of Corrosion-Related Damage." In CONFERENCE 2025. AMPP, 2025. https://doi.org/10.5006/c2025-00153.

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Abstract Military aircraft operating in challenging environments frequently develop corrosion damage. Nearly 80% of inspected corrosion damage sites in aircraft were found to have fatigue cracks; frequently these cracks initiated from corrosion pits. These findings reveal the importance of developing advanced predictive tools to investigate the effects of corrosion and mechanical stress on aircraft operational performance. A new computational approach to characterize the effects of corrosion related defects on fatigue life is presented. This approach includes determination of SIF solutions for

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Arumugam, Udayasankar, Ming Gao, Ravi Krishnamurthy, Rick Wang, Richard Kania, and David C. Katz. "Application of Plastic Strain Damage Models to Characterize Dent with Crack." In CORROSION 2013. NACE International, 2013. https://doi.org/10.5006/c2013-02858.

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Abstract Currently, the allowable strain limit for a plain dent is 6 percent as per ASME* B31.81 for gas pipelines. Field experience has shown that the 6% strain limit for plain dents could be overly conservative, which can result in unnecessary excavations and repairs. Recently, efforts to develop an alternative strain limit have been proposed. In this paper, two plastic damage-based models, namely, ductile failure damage and strain limit damage, and one minimum elongation-based criterion are reviewed. Attempts have been made to use these models to characterize rock dents associated with crac

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Mellings, Sharon, Andres Peratta, John Baynham, and Tim Froome. "Using Predicted Corrosion Damage to Determine Stress Concentration, Fracture and Crack Growth." In CORROSION 2016. NACE International, 2016. https://doi.org/10.5006/c2016-07800.

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Abstract Structure surfaces damaged by corrosion may develop stress concentrations which lead to initiation of cracks and possible crack growth. Simulation of the galvanic effects leading to corrosion takes account of the properties of the electrolyte as well as the structural materials, to determine electric fields within the electrolyte, attenuation in the return path, and the surface current densities and potentials. If dissimilar materials are present or a CP system is not adequately designed, areas may exist where anodic current occurs on a structural surface, causing mass loss from the s

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Sogawa, Takayuki, Naoki Sogabe, and Yohei Taira. "Study on Damage Assessment of RC Piers Based on Residual Cracks." In IABSE Symposium, Tokyo 2025: Environmentally Friendly Technologies and Structures: Focusing on Sustainable Approaches. International Association for Bridge and Structural Engineering (IABSE), 2025. https://doi.org/10.2749/tokyo.2025.0132.

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<p>To assess the damage of RC piers after an earthquake, it is important to estimate the maximum response of the longitudinal rebar strain and the residual displacement of the piers. In this study, the authors developed a method for estimating these values based on the residual cracks which can be measured after an earthquake. A cyclic loading test on the RC column was conducted, and changes in rebar strain distribution were measured using optical fiber sensors. As a result, the residual crack width showed a strong correlation to the integrated values of longitudinal rebar strain at load

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Ma, L., A. S. Kobayashi, S. N. Atluri, and P. W. Tan. "Crack Linkup at Multiple Site Damage." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0354.

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Abstract A commonly used design criterion for predicting the onset of crack link up at a multiple site damage (MSD) is when the sum of the plastic zones of two adjacent cracks is equal to the remaining ligament (Swift 1985, Broek et al 1994). The collapse load predicted by this criterion, however, will differ with the analytical plastic zone and in general, will yield a nonconservative load. Recently, Pyo et al (1997) have shown that the T* integral, which was designed for elastic-plastic fracture mechanics, can predict the extent of stable crack growth and the subsequent collapse load of wide

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Rana, Arnav, Sanjay Tiku, Mark Piazza, and Tim Burns. "Enhancement of Mechanical Damage Crack Evaluation." In 2022 14th International Pipeline Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/ipc2022-87345.

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Abstract This paper presents the results of a project undertaken to enhance previously developed tools being adopted in an industry recommended practice (API RP 1183) for pipeline mechanical damage (MD) integrity assessment and management. This project builds on MD assessment and management tools, developed on behalf of Pipeline Research Council International (PRCI), Interstate Natural Gas Association of America (INGAA), Canadian Energy Pipeline Association (CEPA), American Petroleum Institute (API), other research organizations and individual pipeline operators and were included in API RP 118

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Pavelko, Vitalijs. "Analysis of the crack resistance of layered composite using the model of quasi-static crack growth." In ADVANCES IN FRACTURE AND DAMAGE MECHANICS XX. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0145134.

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Lagoudas, Dimitris C., Shouze Xu, David Miller, and David H. Allen. "Damage in Oxidized Titanium Metal Matrix Composites." In ASME 1996 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/imece1996-0480.

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Abstract The oxidation effects on surface crack development of oxidized Ti 15-3 and Ti β-21S Metal Matrix Composite (MMC) unidirectional laminates under applied mechanical loading are investigated in the present study. Experimental results of surface crack development as a function of applied load are presented. An approximate mechanical model is established and a stress analysis of an oxidized laminate with surface cracks is performed. To simplify the analysis, motivated by experimental observations, a periodic distribution of surface cracks in the oxide layer is assumed. The critical value o

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Bednarz, Piotr, and Jaroslaw Szwedowicz. "Crack Propagation Prediction Using Haensel Damage Model." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68162.

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The Haensel damage model correlates lifetime of a component until crack initiation to the dissipated and stored energy in the material during cyclic loading. The crack initiation is influenced by mean stresses. The Haensel damage model considers the mean stress effect by including compressive and tensile stresses in calculations of elastic strain energy during cyclic loading conditions. The goal of the paper is to extend the above model to predict crack propagation under large cyclic plasticity and non-proportional loading conditions. After voids initiation onset of necking, voids growth and l

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Звіти організацій з теми "Crack damage"

Wei, Y., C. L. Chow, and C. T. Liu. Damage Analysis for Mixed Mode Crack Initiation. Defense Technical Information Center, 2000. http://dx.doi.org/10.21236/ada408454.

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Miller, T. C. Effects of Damage on Interfacial Crack Tip Fields. Defense Technical Information Center, 1989. http://dx.doi.org/10.21236/ada382132.

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Nmai, Charles, and Mark Bowman. Crack Growth Gages for Monitoring Fatigue Damage : Final Informational Report. Purdue University, 1987. http://dx.doi.org/10.5703/1288284314126.

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Cialone, H., D. N. Williams, and T. P. Groeneveld. L51621 Hydrogen-Related Failures at Mechanically Damaged Regions. Pipeline Research Council International, Inc. (PRCI), 1991. http://dx.doi.org/10.55274/r0010313.

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Leaks attributed to hydrogen-stress cracking (HSC) initiating in regions of mild mechanical damage have been reported in cathodically protected pipe lines constructed from high-strength, microalloyed, controlled-rolled steels. The hydrogen is believed to be present in service from the cathodic potential applied. Laboratory studies were initiated to determine the factors that contributed to those unexpected failures. Strain aging at ambient temperatures as a result of deformation introduced during the mechanical damage, was found to be a significant factor. Smooth-bar specimens that were strain

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Levy, Mier, and Albert Kuo. Assessment of Damage Tolerance Requirements and Analyses: A User's Manual for Crack Growth and Crack Initiation Analysis: 'DAMGRO. Defense Technical Information Center, 1986. http://dx.doi.org/10.21236/ada171209.

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Arumugam, Udayansankar, Pablo Cazenave, and Ming Gao. PR-328-133702-R01 Study of the Mechanism for Cracking in Dents in a Crude Oil Pipeline. Pipeline Research Council International, Inc. (PRCI), 2019. http://dx.doi.org/10.55274/r0011556.

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Phase one report: Crack fields (colonies) in dents are often observed in liquid pipe lines. Because of their colonial appearance, these cracks in dents are often thought to be associated with stress corrosion cracking (SCC). However, a recent full-scale dent fatigue testing under a PRCI mechanical damage program showed that crack colonies in dents can be produced by fatigue. This observation facilitated PRCI to launch a further study of the cracking mechanism in dents using samples extracted from a liquid pipeline. A total of 6 pipe samples containing dent with crack/metal loss were investigat

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Swankie, Martin, and Andrews. L52012 Mechanisms and Kinetics of Crack Growth in Areas of Mechanical Damage. Pipeline Research Council International, Inc. (PRCI), 2005. http://dx.doi.org/10.55274/r0011185.

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The project was primarily experimental in nature. It has utilised small scale specimen and ring expansion testing rather than full scale vessel tests to investigate the mechanisms responsible for time-delayed failures. The aim was to perform a series of laboratory experiments to investigate the influence of pre-strain and cyclic frequency on the behaviour of pipeline steels subject to low cycle fatigue and sustained loads. The initial experimental programme consisted of tensile tests and fatigue crack growth tests including tensile dwell periods, carried out on pre-strained and non pre-straine

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Liu, C. T. Effects of Load History on Damage Characteristics Near Crack Tips in a Particulate Composite Material. Defense Technical Information Center, 2000. http://dx.doi.org/10.21236/ada397886.

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Green, William H., Raymond E. Brennan, and Costas F. Fountzoulas. XCT Study of Cone Crack Damage in Multilayered Transparent Panel Structures and Comparison to Modeling. Defense Technical Information Center, 2012. http://dx.doi.org/10.21236/ada568923.

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Chell and Crouch. HIX1IYS Nonlinear Harmonic Based Mechanical Damage Severity for Delayed Failures in Pipelines. Pipeline Research Council International, Inc. (PRCI), 2008. http://dx.doi.org/10.55274/r0011186.

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The objectives of the current work are to (1) provide an assessment of the capabilities of the nonlinear harmonic (NLH) method to detect gouged dents in pressurized pipelines; (2) rank the severity of the detected defects against delayed failure; (3) provide information related to the remaining lives of detected defects when fatigue damage from cyclic pressure changes is the time-dependent mechanism controlling delayed failure; and (4) transfer the developed NLHbased defect severity criteria to an inline inspection vendor, Tuboscope Pipeline Services. An ancillary objective is to assess the ca

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