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从超声疲劳载荷的主要特征出发,通过三维有限元计算及动态模态分析,研究了超声疲劳载荷下包括整体裂纹扩展试件及聚能器在内的振动体的应力、应变场和位移场分布;分别讨论了超声疲劳载荷(R=-1)和超声疲劳载荷叠加平均应力(R>-1)两种情况下振动体固有振动模态的变化规律.为便于理解,简要综述了超声疲劳试验机的工作原理以及应用超声疲劳试验技术研究工程结构材料疲劳裂纹扩展性能的方法.
Based on the main characteristics of ultrasonic fatigue loading, the stress, strain and displacement fields of the vibrating body including the whole crack propagation specimen and the concentrator under the ultrasonic fatigue loading were studied by means of three-dimensional finite element analysis and dynamic modal analysis The variation regularity of natural vibration mode of the vibrating body under the two conditions of ultrasonic fatigue load (R = -1) and ultrasonic fatigue load superimposed average stress (R> -1) are discussed respectively. For easy understanding, the ultrasonic fatigue test Machine working principle and application of ultrasonic fatigue test technology engineering structural materials fatigue crack growth performance of the method.