In this paper, the loading path effect on the elastic-plastic crack-front stress field in a thin plate is investigated. There different loading sequences include one proportional loading and two non-proportional loading paths are applied to the 3-D modified boundary layer (MBL) model under small-scale yielding conditions. For the same external displacement field applied at the outer boundary of the 3-D MBL model, the mode I K field and T-stress field combined as the different loading path is 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 the T-stress field following by K field loading path. The results show that it is very important to include the load sequence effects in fracture analysis when dealing with nonproportional loading conditions.

Additional Metadata
Persistent URL dx.doi.org/10.1115/PVP2016-63851
Conference ASME 2016 Pressure Vessels and Piping Conference, PVP 2016
Citation
Jin, Z. (Zhaoyu), & Wang, X. (2016). The effects of nonproportional loading on the elastic-plastic crack-fronts fields. In American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP. doi:10.1115/PVP2016-63851