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

E-ISSN： 1662-7482|2016|853|83-87

ISSN： 1660-9336

Source： Applied Mechanics and Materials, Vol.2016, Iss.853, 2017-01, pp. : 83-87

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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.