水泥砂浆石在一维与准一维应变状态下动态力学响应的比较和讨论

DISCUSSION ON DYNAMIC MECHANICAL BEHAVIORS OF CEMENT MORTAR UNDER QUASI-ONE AND ONE DIMENSIONAL STRAIN STATES

分别采用改进了的SHPB被动围压试验方法及一级气炮 ,研究了水泥砂浆石在准一维应变及一维应变下的动态力学响应。分别得到了水泥砂浆石经摩擦力修正后的动态弹性常数、屈服强度以及高压下含损伤水泥砂浆石的冲击绝热关系。对水泥砂浆石在准一维应变、一维应变、一维应力下的应力 应变关系与高压下静水压缩曲线进行了比较和讨论。发现若以一维应变代替准一维应变 ,其弹性区模量。

The dynamic mechanical behaviors of cement mortar under quasi-one and one-dimensional strain states are studied by using an improved passive confining SHPB method and one stage gas gun respectively. The friction-corrected dynamic elastic constants and the yield strength are calculated. And the shock adiabatics at intense dynamic loading by taking into account the internal damage is obtained. Furthermore the stress-strain curves of cement mortar under three different stress states and the initial behavior of hydrodynamic curve are compared and analyzed. It is shown that the results obtained from the tests with confined pressure are quite different from the results obtained from the gas gun tests, so that a quasi-one dimensional strain test with confined pressure should not be approximately dealt with as an one dimensional strain test.