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首页> 外文会议>International Conference on Structural Integrity and Fracture, SIF 2002, Sep 25-27, 2002, Perth, Australia >On the influence of the factors on fatigue crack growth retardation
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On the influence of the factors on fatigue crack growth retardation

机译：影响疲劳裂纹扩展的因素

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摘要

Constant ΔK fatigue crack growth tests were performed by applying an intermediate multiple overload for S45C steel. The purpose of the present study is to investigate effects of specimen thickness at various baseline stress intensity factor range levels (ΔK_b), the application position of the overload (a/W) and the application frequency of the overload (OL_(Hz)) on fatigue crack growth retardation behavior. The principal results are summarized as follows. The amount of retardation for a given ΔK_b level is increased with increasing ΔK_b for all specimen thickness. The normalized minimum crack growth rate is increased with increasing the specimen thickness, except for ΔK_b = 45 MPa m~(1/2). The retardation cycle is decreased with increasing a/W and increased with OL_(Hz).
机译：通过对S45C钢施加中等多次过载，进行了恒定的ΔK疲劳裂纹扩展测试。本研究的目的是研究试样厚度在各种基线应力强度因子范围水平（ΔK_b），过载的施加位置（a / W）和过载的施加频率（OL_（Hz））的影响。疲劳裂纹的生长迟缓行为。主要结果总结如下。对于所有样品厚度，给定ΔK_b水平的延迟量随ΔK_b的增加而增加。除ΔK_b= 45 MPa m〜（1/2）外，归一化的最小裂纹扩展速率随样品厚度的增加而增加。延迟周期随a / W的增加而减小，随OL_（Hz）的增加而增加。

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