【摘要】 综合分析了多冲载荷的特性及有关多冲试验的文献,得出多冲载荷兼有循环载荷和冲击载荷的特点,循环载荷的特点导致材料在多冲载荷下的破断过程不同于一次摆锤冲击载荷下的破断过程,多冲试验有别于一冲试验。多冲载荷下材料的破坏过程是循环载荷作用下的裂纹萌生及扩展过程,属于疲劳范畴,但冲击载荷的特性又导致应力波的传播和叠加及加载速率的作用变得重要起来,与一般疲劳试验相比,多冲试验具有其独特的性质,不能被疲劳试验所代替。更多还原

【Abstract】 Based on analyzing and summing up literatures on repeated impact load character and test this paper shows that repeated impact load has not only repeated load character but also impact load character, Repeated load character makes the tracture procedure of materials under repeated impact load differ from that under impact ductility test. The fracture procedure under repeated impact load is also the crack initiation and crack prpagation under repeated load. It is a kind of fatigue. Repeated impact test is different from impact ductility test. Impact load character makes the propagation and repeated addition of stress wave and the rate of strain become more important. In comparision with non-impact fatigue test, repeated impact test has special character. It can not’ be replaced by non-impact fatigue test.更多还原