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Study of the relationship between J-integral and COD parameters under mixed mode I + II loading in aluminum alloy Ly 12

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Abstract

In this paper, the relationship between the J-integral and COD under mixed mode I+II loading was proposed and investigated. The J-integral was calculated by the Finite Element Method, and COD was defined by Rice`s model and measured by a duplicating method in an aluminum alloy Ly12. The critical values of the J-integral and COD for a stable mixed crack initiation were also determined by a resistance curve. It shows that: (1) the mixed J-integral, J M, and the mixed COD satisfy the relations of J M=dn⋅σ0⋅CTOD+ds⋅τ0⋅CTSD and J M=d⋅σyield⋅COD, where dn, ds and d are coefficients; CTOD and CTSD are the mode I and mode II components of COD, respectively; σ0 and τ0 are the tensile and shear stresses at the crack tip strip, respectively, and (2) the initiation values of the J-integral and COD of mixed stable crack growth increase with an increasing mode II component, the J IIC value is 2 times greater than that of J IC, and the CODi for a pure mode II crack is 6 times greater than that of CODi for a pure mode I crack.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Guang Dong University of Technology, Guang Zhou, , 510090, China

    Sha Jiangbo

  2. Institute of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, , 710049, China

    Sun Jun, Zuh Pin, Deng Zengjie & Zhou Huijui

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  1. Sha Jiangbo
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  2. Sun Jun
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  3. Zuh Pin
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  4. Deng Zengjie
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  5. Zhou Huijui
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Jiangbo, S., Jun, S., Pin, Z. et al. Study of the relationship between J-integral and COD parameters under mixed mode I + II loading in aluminum alloy Ly 12. International Journal of Fracture 104, 409–423 (2000). https://doi.org/10.1023/A:1007647230722

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