PMMA中央き裂引張試験片のき裂長さと伝ぱ速度および破面模様の関係

概要

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We previously reported that the experimental crack velocity in a center-cracked specimen of unsaturated polyester resin is well expressed by one of the three different velocity equations of a constant stress, a mixed condition and a constant strain due to the central crack length C_<01> under tension. Here, we show that the three different velocity equations are well fitted to express the velocity of fast fracture in PMMA sheet specimens having different crack lengths. The experimental crack velocity generally decreases as the crack length increases, and its change with the relative crack length C_1/C_<01>. The velocity expressions, combined with the existing relation between crack velocity and a dynamic stress-intensity factor, give the variations of the dynamic stress-intensity factor and a dynamic strain-energy release rate with C_1/C_<01> for the specimens, both of which are in qualitative agreement with the experimental variations of the number of fracture surface marks and their density in the specimens.
一般社団法人日本機械学会の論文
1989-10-25