PMMAの計装化衝撃試験と破壊靱性評価

概要

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In the present study, fracture toughness of PMMA is evaluated based on the instrumented impact test and static three-point bending test. In the measurement of true fracture load in the instrumented impact test, a very difficult problem associated with a remarkable inertial loading effect is pointed out. However, it is shown that the inertial loading effect can be controlled by changing the period (τ) of vibration in specimen. It is also shown that the fracture toughness (K_I) is affected by the loading rate (K^^.). It is observed in the tested range of K^^. (3.8 10^<-3>~2.3 10^4MNm ^<-3/2> S^<-1>) that the changing tendency can be divided into three types. That is, K_I increases monotonously at first, then decreases, and increases once again with increasing loading rate. Furthermore, it is observed that a feature of fracture morphology is the change from a stable fracture to an unstable one with increasing in K^^..
一般社団法人日本機械学会の論文
1989-12-25