2015:53 Ductile tearing – Micromechanical analyses and experimental study

In this report, the project "Ductile Tearing-Micromechanical analyses and experimental study" is presented. In the project, numerical cell modeling has been conducted using the shear modified Gurson model proposed by Nahshon and Hutchinson to evaluate its capability in predicting the effect of residual stresses. Experimental work has also been conducted for material characterization. The material used in the experiments was A533B-1.

The computational work done shows that the cell model does capture the effects attributable to residual stresses, as seen in the experimental work by Bolinder et al. From the predicted results presented in Chapter 5.3 the same conclusions that were made from the experimental results in can be drawn with regard to fracture toughness and the decreasing influence on the J-integral for increasing primary load. The predictions made here also show an improvement when using the shear modified Gurson model compared with earlier predictions in, where the standard Gurson model was used.

The results presented in this report lead to the conclusion that using the cell modeling technique is a sound approach in studying the effects from residual stresses on ductile fracture at low primary loads.