- 著者
-
東藤 貢
高橋 清
/
KAUSH H. Henning
- 出版者
- 一般社団法人日本機械学会
- 雑誌
- 日本機械学会論文集. A編 = Transactions of the Japan Society of Mechanical Engineers. A (ISSN:03875008)
- 巻号頁・発行日
- vol.64, no.617, pp.36-43, 1998-01-25
- 参考文献数
- 13
- 被引用文献数
-
2
2
Mode I fracture behavior of rubber toughened PMMA (RTPMMA) was studied over five decades of displacement rates (10<SUP>-4</SUP>-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<SUB>1max</SUB> and the maximum energy release rate G<SUB>1max</SUB>. K<SUB>1max</SUB> and G<SUB>1max</SUB> 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<SUB>1max</SUB> and G<SUB>1max</SUB> 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<SUB>1max</SUB>of neat PMMA increased with the increase in displacement rates and G<SUB>1max</SUB> remained constant as the rate increased. Discussion is given on the rate-dependent K<SUB>1max</SUB> and G<SUB>1max</SUB> values, taking (K<SUB>1max</SUB>)<SUP>2</SUP>/G<SUB>1max</SUB>into account. The fracture surface morphology of the specimens is also discussed.