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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 1989, Vol. 10 ›› Issue (12): 601-606.
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Guan Zhongxin, Yang Xiaohua
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Abstract: The J-integral as a controlling parameter was applied to the crack growing process by Hutchinson and Paris. An engineering approach based on J-integral was proposed by some Ref. However, it is necessary to study whether the J-integral is really a basic controlling parameter. It has been shown from the results given in this paper that J-integral is not basic while the Jn-intergral defined in this paper is a basic controlling parameter for crack growth in elastic -plastic state.In this paper, a method combining experimental observation with elastic-plastic finite element numerical calculation is used to study the feature of J and Jn. It is shown form Equ.(20) that the essential feature of local stress/strain field can be characterized by Jn, but it can be seen from Equ(8) that J-integral includes the energy dissipated in geometry-dependent plastic deformation remote from the advancing crack-tip.Thus , Jn should be the basic parameter controlling crack growth, but J is not basic. Jn-integral may be the most promissing parameter for elastic-plastic fracture.
Guan Zhongxin;Yang Xiaohua. J_n-INTERGRAL AND THE CONTROLLING PARAMETER FOR CRACK GROWTH[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 1989, 10(12): 601-606.
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