Ａ２０１７‐Ｔ４の破壊靭性のひずみ速度依存性

概要

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Recently, aluminum alloy is often used as structural material not only in aerospace vehicle but in high speed train and LNG tanker etc. to reduce environmental load. In order to evaluate the dependence of strain rate upon fracture toughness for aluminum alloy, A2014-T4, both dynamic tensile and fracture tests were carried out ranging from low to high strain rate. As a result, the yield stress was almost constant independent of strain rate but the elongation decreased with increasing strain rate. The fracture toughness also decreased with increasing strain rate and reached a certain value at high strain rate. While the specimen was fractured almost in a brittle manner for all strain rates, the SEM observation on the fracture surface proved a ductile dimple pattern even at high strain rate. In addition, finite element stress analysis which included the effect of heat rise by plastic deformation was performed to inspect the validity of experimental fracture toughness according to JSME standard.
一般社団法人日本高圧力技術協会の論文