Topic
Paris' law
About: Paris' law is a research topic. Over the lifetime, 13815 publications have been published within this topic receiving 224818 citations. The topic is also known as: Paris-Erdogan law.
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TL;DR: In this paper, a stress intensity factor solution for the case of a surface crack in a finite width plate was determined for tension or bending and included a finite area correction factor, which was shown to correlate fatigue crack growth data measured on surface cracked plate specimens with conventional through crack data.
55 citations
TL;DR: In this paper, the effect of welding residual stresses on the crack growth rate is related to the position of the crack and its orientation with respect to the weld line, and its influence on the fatigue crack closure is discussed.
55 citations
TL;DR: In this paper, a theoretical and practical support is provided for evaluating the growth of fatigue cracks under non-proportional cyclic loading conditions. But, the theoretical support is limited.
55 citations
TL;DR: In this paper, the effect of compressive underload on crack-tip blunting under tensile loads and re-sharpening of the crack tip during unloading is investigated.
55 citations
TL;DR: In this article, the authors studied the effect of cyclic frequency on the growth rate of fatigue cracks in polystyrene polycarbonates. And they found that at low stress intensity values, a highly reflective, mirror-like surface was observed which transformed to a rougher, cloudy surface structure.
Abstract: Fatigue crack growth characteristics in polystyrene were studied as a function of stress intensity factor range and cyclic frequency. Precracked single edge notched and compact-tension type specimens made from commercially available polystyrene sheet (mol.wt. =2.7×105) were cycled under constant load at frequencies of 0.1, 1, 10 and 100 Hz, producing growth rates ranging from 4×10−7 to 4×10−3 cm/cycle. For a given stress intensity level, fatigue crack growth rates were found to decrease with increasing frequency, the effect being strongest at high stress intensity values. The variable frequency sensitivity of this polymer over the test range studied was explained in terms of a variable creep component. The macroscopic appearance of the fracture surface showed two distinct regions. At low stress intensity values, a highly reflective, mirror-like surface was observed which transformed to a rougher, cloudy surface structure with increasing stress intensity level. Raising the test frequency shifted the transition between these areas to higher values of stress intensity. The microscopic appearance of the mirror region revealed evidence of crack propagation through a single craze while the appearance of the rough region indicated crack growth through many crazes, all nominally normal to the applied stress axis. Electron fractographic examination of the mirror region revealed many parallel bands perpendicular to the direction of crack growth, each formed by a discontinuous crack growth process as a result of many fatigue cycles. The size of these bands was found to be consistent with the dimension of the crack tip plastic zone as computed by the Dugdale model. At high stress intensity levels a new set of parallel markings was found in the cloudy region which corresponded to the incremental crack extension for an individual loading cycle.
54 citations