Results 201 to 210 of about 34,504 (250)
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A Critical Analysis of Crack Propagation Laws
Journal of Basic Engineering, 1963The practice of attempting validation of crack-propagation laws (i.e., the laws of Head, Frost and Dugdale, McEvily and Illg, Liu, and Paris) with a small amount of data, such as a few single specimen test results, is questioned. It is shown that all the laws, though they are mutually contradictory, can be in agreement with the same small sample of ...
F Erdogan, Erdogan F
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Random Crack Propagation Analysis of a Beam with a Crack
51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference<BR> 18th AIAA/ASME/AHS Adaptive Structures Conference<BR> 12th, 2010Probabilistic methodology is used for estimating the growth of an existing crack in a thinwalled beam with a closed cross-section. The beam is subjected to stochastic loads. The initial length of the crack is considered to be an uncertain quantity represented by a random variable.
Chalitphan Kunaporn +3 more
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Stability analysis of crack propagation
Physica A: Statistical Mechanics and its Applications, 1991Abstract The propagation of a crack in an isotropic elastic medium is treated as a moving boundary problem. Linear stability analysis shows that for the stretched membrane with a central, initially circular hole all modes are stable. On the other hand all modes are unstable for a two-dimensional arrangement where the crack is induced by pressure in a
H.J. Herrmann, J. Kertész
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Fatigue Crack Propagation Analysis of Plaque Rupture
Journal of Biomechanical Engineering, 2013Rupture of atheromatous plaque is the major cause of stroke or heart attack. Considering that the cardiovascular system is a classic fatigue environment, plaque rupture was treated as a chronic fatigue crack growth process in this study. Fracture mechanics theory was introduced to describe the stress status at the crack tip and Paris' law was used to ...
Pei, Xuan, Wu, Baijian, Li, Zhi-Yong
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Crack propagation with quasistatic energy analysis
The Journal of Strain Analysis for Engineering Design, 1977In the application of quasistatic energy analysis, the P-u-A diagram has been found a valuable supplement in illustrating the characteristics of crack propagation. The diagram is useful not only for evaluating fracture toughness under quasistatic conditions, but also for representing important fracture parameters such as stability criteria, crack speed,
C L Chow, K M Ngan
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1994
Fatigue cracks may propagate either from an existing flaw, such as an inclusion or a defect in a weld, or they may grow from damage nucleated as part of the early stages of fatigue itself. It is into this second category that fretting fatigue falls. The fretting process must first initiate an embryo crack and then propagate it in order to produce a ...
D. A. Hills, D. Nowell
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Fatigue cracks may propagate either from an existing flaw, such as an inclusion or a defect in a weld, or they may grow from damage nucleated as part of the early stages of fatigue itself. It is into this second category that fretting fatigue falls. The fretting process must first initiate an embryo crack and then propagate it in order to produce a ...
D. A. Hills, D. Nowell
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An analysis of non-propagating fatigue cracks
Metallurgical Transactions A, 1975An analysis for the formation of nonpropagating fatigue cracks at (the base of V-shaped) notch roots, based on the considerations of the extent of the critically stressed region ahead of a notch or a crack tip, and the resulting volumetric strength effect, is developed.
D. N. Lal, V. Weiss
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Experimental analysis of crack propagation in granite
International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1985An experimental approach is used to demonstrate the concept of an effective crack length with double-edge-notched specimens of charcoal and rockville granite. Crack propagation in rock is characterized by microcracking around the crack tip and interlocking along a portion of the crack; this region is called the fracture process zone, and together with ...
J.F. Labuz, S.P. Shah, C.H. Dowding
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Monitoring Analysis for the Velocity of Crack Propagation
Key Engineering Materials, 2007The crack gauge sensor and pencil core sensor are two kinds of elements commonly used to monitor the crack propagation velocity; both of them have the advantage of easy operation, low price, etc. However, they also have the disadvantage, namely, bigger measuring error.
Jing Xi Chen +3 more
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Elastic-plastic analysis of crack propagation with branching
Engineering Fracture Mechanics, 1994A numerical procedure is described for the elastic—plastic finite element analysis of crack propagation with branching. Constraint equations are used to model crack closing and sliding. Constraint conditions are imposed by using a penalty method for the self‐similar crack propagation and an elimination method for the off‐axis propagation.
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