Influence of Free Surface Roughening on Ductile Fracture Behavior Under Uni-axial Tensile State for Metal Foils
The metal foils indicate low level fracture strain compared with metal sheet. In this study, the free surface roughening is focused on to clarify the mechanism of ductile fracture for metal foils, since the ratio of surface roughness to thickness becomes larger compared with metal sheets. Materials used are pure copper and pure titanium foils and sheets with thickness of 0.05, 0.1, 0.3 and 0.5mm respectively. Free surface roughening and ductile fracture behavior are measured and observed under uni-axial tensile state. As a result, the surface roughening to thickness of metal foils with thickness of 0.05 and 0.1mm was larger than that of metal sheets with thickness of 0.3 and 0.5mm. To investigate the fracture behavior of metal foils, the fracture surface is observed by scanning electron microscope. For pure copper foils with thickness of 0.05 and 0.1mm, dimple pattern cannot be observed, while some dimples for metal sheets such as pure copper and pure titanium sheets with thickness of 0.3, 0.5mm and pure titanium foils with 0.05 and 0.1mm can be observed. As a result, the fracture type of metal foils divides broadly into two categories: existence dimple type for pure titanium and non-existence dimple for pure copper on fracture surface. In addition, the magnitude relation between the increase in ratio of surface roughness to thickness and strain hardening exponent n value would affect fracture strain level and existence or non-existence of dimple pattern on fracture surface.
Metal foil Free surface roughening Ductile fracture Thickness
Tsuyoshi Furushima Hitomi Tsunezaki Ken-ichi Manabe Ming Yang Sergei Alexandrov
Department of Mechanical Engineering,Tokyo Metropolitan University,1-1 Minami-osawa,Hachioji,Tokyo19 Institute for Problems in Mechanics,Russian Academy of Sciences,101-1 Prospect Vernadskogo,119526 Mo
国际会议
北京
英文
1-6
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）