Application of slip-band visualization technique to tensile analysis of laser-welded aluminum alloy

Ir. Muchiar (1) , S Yoshida (1) , R. Widiastuti (1) , A. Kusnovo (1) , K. Takahashi (2) , S. Sato (2)

1 Indonesian Institute of Sciences
2 Institute of Research and Innovation, Japan

Recently we have developed a new optical interferometric technique capable of visualizing slip band occurring in a deforming solid-state object. In this work we applied this technique to a tensile analysis of laser-welded aluminum plate samples, and successfully revealed stress concentration that shows strong relationships with the tensile strength and the fracture mechanism. We believe that this method is a new, convenient way to analyze the deformation characteristics of welded objects and evaluate the quality of welding. The analysis has been made for several types of aluminum alloys under various welding conditions, and has shown the following general results. When the penetration is deep, a slip band starts appearing at the fusion zone in an early stage of the elastic region of the strain-stress curve and stays there till the sample fractures at that point. When the penetration is shallow, a slip band appears only after the yield point and moves vigorously over the whole surface of the sample till a late stage of plastic deformation when the slip band stays at the fusion zone where the sample eventually fractures. When the penetration depth is medium, some intermediate situation of the above two extreme cases is observed.

Domaines: Physique [physics]

Ir. Muchiar, S Yoshida, R. Widiastuti, A. Kusnovo, K. Takahashi, et al.. Application of slip-band visualization technique to tensile analysis of laser-welded aluminum alloy. SPIE 2921, International Conference on Experimental Mechanics: Advances and Applications,, Dec 1996, International Conference on Experimental Mechanics: Advances and Applications, Singapore. ⟨hal-01092147⟩