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 20wt.% rubber particles (EM20) and pressed RTPMMA containing 40 wt.% rubber particles (PM40), exhibited different rate dependences of the maximum stress intensity factor Kimax and the maximum energy release rate Gimax. Kimax and Gimax 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 Aimax and Gimax 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 Kimaxof neat PMMA increased with the increase in displacement rates and Gimax remained constant as the rate increased. Discussion is given on the rate-dependent Kimax and Gimax values, taking (Kimax)2/Gimax into account. The fracture surface morphology of the specimens is also discussed.
|Number of pages||8|
|Journal||Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A|
|Publication status||Published - Jan 1 1998|
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering