Dislocation model of a subsurface crack
作者:
Fuqian Yang,
J. C. M. Li,
期刊:
Journal of Applied Physics
(AIP Available online 1997)
卷期:
Volume 82,
issue 10
页码: 4816-4822
ISSN:0021-8979
年代: 1997
DOI:10.1063/1.366341
出版商: AIP
数据来源: AIP
摘要:
A dislocation model of a subsurface crack parallel to the surface is presented. For tensile loading, the results agree with those of previous workers except that we studied the crack very close to the surface and found thatKII(mode II stress intensity factor) approachesKI(mode I stress intensity factor) to within about 22&percent;(KII=0.78KI).(Note thatKIIis zero when the crack is far away from the surface). Using bending theory for such situations, it is found that both stress intensity factors are inversely proportional to the3/2power of the distance between the subsurface crack and the free surface. For shear loading, the crack faces overlap each other for the free traction condition. This indicates the failure of the model. However, there was no overlap for tensile loading even though the stresses in front of the crack oscillate somewhat when the crack is very close to the surface. ©1997 American Institute of Physics.
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