ぜい性材料の衝撃引張強度測定法

抄録

A simple measuring method for impact tensile strength of brittle materials is proposed and examined for plaster and ceramic specimens. The experiment is based on the propagation of the tensile stress waves reflected from the free end of the specimen bars by utilizing a modified Hopkinson bar method. The stress waves transmitting into the specimens were detected by a set of two strain gages pasted diametrically at two positions on the input bar. The measuring method and fracture behavior of the specimens are presented and discussed by means of a simple theory of one-dimensional elastic waves in a bar. The impact fracture tests are performed under various loading conditions. The statistical analysis of the impact tensile strength of the specimens by using the Weibull distribution is presented. It is found that the impact tensile strength of both materials is not influenced so much by loading rate.