ゴム強化PMMAのモードI破壊挙動に及ぼす変位速度の影響

概要

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Mode I fracture behavior of rubber toughened PMMA (RTPMMA) was studied over five decades of displacement rates (10^<-4>-13 m/s) using a high-speed tensile testing machine. Two kinds of RTPMMA, extruded RTPMMA containing 20 wt.% rubber particles (EM20) and pressed RTPMMA containing 40 wt.% rubber particles (PM40), exhibited different rate dependences of the maximum stress intensity factor K_<1max> and the maximum energy release rate G_<1max>. K_<1max> and G_<1max> of EM20 decreased rapidly at high rates (1-11 m/s). This suggests that the toughening effect due to rubber blending was dramatically reduced at the high rates. On the other hand, PM40 maintained high K_<1max> and G_<1max> values at all rates tested in this study. Thus, PM40 maintained the toughening effect even at high rates up to 13 m/s. For comparison, unmodified PMMA was also examined, and the results showed that K_<1max>of neat PMMA increased with the increase in displacement rates and G_<1max> remained constant as the rate increased. Discussion is given on the rate-dependent K_<1max> and G_<1max> values, taking (K_<1max>)^2/G_<1max>into account. The fracture surface morphology of the specimens is also discussed.
一般社団法人日本機械学会の論文
1998-01-25