Effect of a shear modified Gurson model on damage development in a FSW tensile specimen

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:46

Article

Nielsen, Kim Lau¹  Tvergaard, Viggo¹ 

[1] Tech Univ Denmark, Dept Mech Engn, DK-2800 Lyngby, Denmark

关键词: Fracture;    Friction stir welding;    Ductile damage;    Shear failure;    Stress triaxiality;   

DOI  :  10.1016/j.ijsolstr.2008.09.011

来源: Elsevier

【 摘 要 】

For a friction stir welded aluminum plate the resistance to ductile failure is studied by analyzing tensile test specimens cut out across the weldline. As the stress triaxiality is rather low in these tests, the Gurson material model is not expected to give a very accurate description of the void growth to coalescence. A recently proposed modified version of the Gurson model is used, in which an extra term in the damage evolution law allows for the prediction of failure even at zero or negative values of the mean stress. This modification of the Gurson model is purely phenomenological, such that the damage parameter does not really represent the void volume fraction. Various amounts of the additional damage evolution are compared with predictions of the original Gurson model. The analyses are carried out for different yield stress profiles transverse to the weld and for different specimen widths. It is found that the modification does provide additional damage development in the friction stir weld, which may help to fit experimental data. But the suggested modification depends strongly on the overall stress state, and may have a too strong effect in some cases where the stress triaxiality is rather high. (c) 2008 Elsevier Ltd. All rights reserved.

【 授权许可】

Free