Results 271 to 280 of about 15,676,159 (315)
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A Study on Development of Cracks on Paintings
Journal of the American Institute for Conservation, 1990AbstractHumidity-induced movements were studied on biaxially stretched samples of sized and gessoed fabric and on films of size and gesso without fabric. In-plane strains were detected through observation of crack patterns formed in a brittle coating applied on the samples.
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Investigations on crack development and crack growth in embedded solar cells
SPIE Proceedings, 2011In recent investigations using various analysis methods it has been shown that mechanical or thermal loading of PV modules leads to mechanical stress in the module parts and especially in the encapsulated solar cells. Cracks in crystalline solar cells are a characteristic defect that is caused by mechanical stress. They can lead to efficiency losses
M. Sander +5 more
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Crack Shape Development of Two Interacting Surface Elliptical Cracks
Computer Technology and Applications, 2003The issue of assessing residual life of an aged structure based on damage tolerance concepts attained significance in high technology fields such as aerospace, piping and pressure vessels and nuclear engineering. Computational fracture analysis of these structures in the presence of single or multi-site surface flaws is essential for life estimation ...
S. K. Patel +2 more
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The development of quench cracks in steel
Metal Science and Heat Treatment, 19701. For some steels there is a specific cooling rate in the martensitic region at which the probability of quench cracks is maximum. A change in the cooling rate reduces the probability of crack formation. 2. During the transformation of austenite to martensite there is considerable evolution of heat, i.e., on the temperature curves there
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Relating closure development in long cracks to the short-crack regime
International Journal of Fatigue, 1991Abstract Crack closure mechanisms require some finite amount of crack growth to become fully operative, and this appears to be a major reason for the existence of short-crack behaviour. Although such behaviour is not always explicable in terms of an effective, closure-free, stress intensity range, there is some evidence to indicate that short-crack ...
M JAMES, R GARZ
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Geoderma, 1996
Abstract Surface cracks develop in many clay soils as they dry. Since they are difficult to adequately sample in most volumetric samples, it is useful to measure them so that volumetric measurements of water content, for example, can be corrected. A method for measuring cracks in soils is described.
A.J. Ringrose-Voase, W.B. Sanidad
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Abstract Surface cracks develop in many clay soils as they dry. Since they are difficult to adequately sample in most volumetric samples, it is useful to measure them so that volumetric measurements of water content, for example, can be corrected. A method for measuring cracks in soils is described.
A.J. Ringrose-Voase, W.B. Sanidad
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Developing a crack inspection robot for bridge maintenance
2011 IEEE International Conference on Robotics and Automation, 2011One of the important tasks for bridge maintenance is bridge deck crack inspection. Traditionally, a human inspector detects cracks using his/her eyes and finds the location of cracks manually. Thus the accuracy of the inspection result is low due to the subjective nature of human judgement.
Ronny Salim Lim +3 more
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FURTHER OBSERVATIONS OF EARLY FATIGUE CRACK DEVELOPMENT
Fatigue & Fracture of Engineering Materials & Structures, 1996Abstract—A scanning electron microscope (SEM) has been used to examine plastic replicas taken from the surface of fatigue specimens in order to understand the role of microstructure on the early stages of fatigue crack development under various environmental conditions.
Wang, Y. Z. +3 more
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Development of multi-phase-field crack model for crack propagation in polycrystal
International Journal of Computational Materials Science and Engineering, 2014It is vitally important to ensure the safety of brittle materials. Therefore, it is essential to deeply understand the interaction of the material's microstructure and crack propagation. In this study, we constructed a multi-phase-field crack model which can express crack propagation in polycrystal.
Kento Oshima +2 more
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Characterising the early stages of crack development in environment-assisted cracking
Corrosion Engineering, Science and Technology, 2017ABSTRACTAn overview is given of recent NPL research to characterise the early stages of crack development in environment-assisted cracking, focusing on the nature of the crack precursors, the pit-to-crack transition, and the impact of solution chemistry on growth rate in the small and long crack growth rate regime.
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