The Effects of Nonproportional Loading on the Elastic-Plastic Crack-Tip Fields

Abstract:

In this paper, the loading path effects on the plane strain elastic-plastic crack-tip stress field are investigated computationally. Three different loading sequences include one proportional loading and two non-proportional loading paths are applied to the modified boundary layer (MBL) model under small-scale yielding conditions. For the same external displacement field applied at the outer boundary of the MBL model, the mode I K field and T-stress field combined as the different loading paths are applied to investigate the influence of the nonproportional loading. The results show that for either the compressive or tensional T-stress, the loading path which applied K field followed by T field generates the lower crack-tip constraint. There is only slightly difference between the proportional loading path and that with the T-stress field following by K field. The results show that it is very important to include the load sequence effects in fracture analysis when dealing with nonproportional loading conditions.

• Periodical: Applied Mechanics and Materials (Volume 853)
• Pages: 83-87
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.853.83
• Online since: September 2016
• Authors: Zhao Yu Jin, Xin Wang*, Dun Ji Yu, Xu Chen
• Keywords: Constraint Effect, Crack Tip Fields, Elastic-Plastic Fracture, Nonproportional Loading

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