SOME KEY ISSUES ON STRAIN SIGNAL MEASUREMENTS OF HIGH-SPEED IMPACT TEST: PRELIMINARY RESULTS AND PHENOMENON INTERPRETATIONS

摘要

During the last several decades, considerable efforts have been made on high-speed impact tests to investigate dynamic properties of materials, such as metal, alloy, ceramic, polymer, rock, concrete, brick and mortar etc. The purpose of impact (also called shock) test is to study the crash-relevant or blastrelevant behavior of materials under high strain rates. According different test purposes, sometimes the strain rate could be extremely high, eg. up to 10000 unit strain per second. In the School of Civil and Resource Engineering at the University of Western Australia, several impact tests on steel material as well as on concrete material have been carried out recently, to study the impact loading ability of an innovative Blast Simulator machine. From the tests, some key issues on strain signal measurements of high-speed impact test which may have an unavoidable influence on material properties were observed, and some preliminary results on a steel specimen will be discussed in the current paper.