应力–应变曲线初始屈服的一个新定义及其应用

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Abstract Through combining the path dependent hardening parameter and the definition of initial yield，a new definition method of initial yield is proposed. The key idea of this method is to apply the failure point to define the initial yield point on each stress-strain curve，in which the calculation of path dependent hardening parameter is prime. As an application of this new definition，a group of loading-unloading stress-strain curves of coal samples under confining pressures of 15–50 MPa are used to determine their initial yield points；and then the subsequent yield loci in q-p space are drawn，which reveal a new phenomenon that the slope of each q-p locus increases with hardening parameter. This is an important phenomenon for coal hardening plasticity；and it needs further studies.

Key words： rock mechanics stress-strain plastic initial yield hardening parameter coal rock

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	Articles by authors
	BAI Bing1
	LI Xiaochun1
	TANG Lizhong2

Cite this article:

BAI Bing1,LI Xiaochun1,TANG Lizhong2. A NEW DEFINITION FOR INITIAL YIELD OF STRESS-STRAIN CURVES AND ITS APPLICATION[J]. , 2010, 29(S2): 4077-4081.

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https://rockmech.whrsm.ac.cn/EN/Y2010/V29/IS2/4077

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