932 金属箔および薄板材における自由表面あれ挙動と延性破壊に及ぼす板厚の影響 [in Japanese] 932 Effect of Thickness on Free Surface Roughening Behavior and Ductile Fracture for Metal Foils and Thin Sheets [in Japanese]
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Micro metal forming with metal foils is one of the promising approaches to fabricate micro parts. The deformation behavior of metal foils differs from that of sheet metals due to size effect. In this research, the objective is to elucidate the fracture mechanism of metal foil. We clarified that fracture factor was different between sheet metal and metal foil. As fracture factor of metal foil, we focused on surface roughening behavior. But it had not been clear how surface roughening behavior affected fracture of metal foil. Additionally, it was hard to say the effect of thickness on fracture mode and fracture strain. In this paper, we researched the deformation behavior between sheet metal and metal foil. Pure copper with the thickness of 0.05, 0.1, 0.3, 0.5mm were used as samples. As a result, fracture strain decreased exponentially from 0.3mm to 0.1mm. Fracture surface of 0.05mm and 0.1mm had no dimples, while that of 0.3mm and 0.5mm had some dimples. Therefore fracture type changed from 0.3.mm to 0.1mm. The ratio of surface roughening to thickness increased rapidly from 0.3mm to 0.1mm. Furthermore, by scratching surface of sheet metal, the number of dimples on the fracture surface decreased. From those result, we considered that surface roughness can affect fracture like scratch when thickness become small.
- The Proceedings of the Materials and processing conference
The Proceedings of the Materials and processing conference 2012.20(0), _932-1_-_932-4_, 2012
The Japan Society of Mechanical Engineers