ABSTRACT

The present paper continues the recent works reported by Liu et al. (2020) where quasi-static indentation experiments and finite element simulations were reported to investigate the plastic behaviour and failure of four stiffened aluminium-alloy plates punched by a rigid hemispherical indenter: one bare plate, one butt-welded plate, two plates with respectively one and two flat-bar stiffeners. Here specimens with the same geometry are investigated using a rigid hemi-cylindrical indenter to examine the effect of the indenter shape on the deformation and collapse modes. The experimental comparison shows the different structural deformation and failure mechanisms of welded aluminium alloy panels. The finite element analysis discusses the importance of the modelling of welded joining details, the boundary conditions and the material degradation at welded heat-affected zones and at the same time illustrates the similarities and differences between impact analyses of aluminium and steel stiffened plates.

摘要

本文延续了 Liu 等人最近报道的工作。（2020 年）据报道，准静态压痕实验和有限元模拟研究了由刚性半球形压头冲压的四块加劲铝合金板的塑性行为和失效：一块裸板、一块对焊板、两块分别具有一个和两个扁钢加强筋。在这里，使用刚性半圆柱形压头研究具有相同几何形状的试样，以检查压头形状对变形和塌陷模式的影响。实验比较显示了焊接铝合金板的不同结构变形和失效机制。有限元分析讨论了焊接连接细节建模的重要性，