EFFECTS OF SHAPE OF LOAD PULSE ON SHOCK-MITIGATING CHARACTERISTICS OF VERMICULITE CONCRETE AND A POLYURETHANE PLASTIC
TEXAS UNIV AT AUSTIN STRUCTURAL MECHANICS RESEARCH LAB
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Preliminary indications of the effects of load pulse on the shock- mitigating characteristics of lightweight vermiculite concrete and a polyurethane plastic are presented. Different input load pulses were obtained in tests on these materials using three different methods of dynamic testing. In the current study, a HYGE Shock Tester was used to provide the impact energy. The form of the characteristic acceleration time curve from this study is compared with the form of those obtained in previously reported tests using air gun and drop tower facilities. Stress-strain cu curves obtained from the three different types of tests were found, in general, to be similar in some respects. Important differences were noted, however, and an attempt is made to explain them in terms of basic differences in the testing methods utilized. Reduction of the test data was facilitated by the use of both analog and digital computers. A brief description of the two methods of data reduction is given. Stress-strain curves from the two methods are compared to indicate their similarity.