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首页> 外文期刊>Engineering Fracture Mechanics >Elastic-plastic fracture resistance of carbon steel for cyclic load (prediction of J-R curve assuming fatigue crack growth)
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Elastic-plastic fracture resistance of carbon steel for cyclic load (prediction of J-R curve assuming fatigue crack growth)

机译：碳钢的弹性塑性断裂抗循环载荷（疲劳裂纹增长的J-R曲线预测）

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摘要

It is well known that the elastic-plastic fracture toughness for a cyclic load is smaller than that for a monotonic load. This study was aimed at investigating the root cause for the reduction in the fracture toughness of carbon steel due to application of a cyclic load. First, fatigue crack growth tests were conducted using plate specimens for a fully-reversed load of various stress amplitudes. The crack growth equation, in which the effective strain intensity factor range was quoted as the crack driving force, was derived to predict the crack growth up to 0.5 mm/cycle. Then, the same material was used to conduct the fracture toughness tests for monotonic and cyclic loading conditions. Plate specimens were used to enable the nominal strain to be measured during the tests. It was shown that the J-R curve and J(0.2) fracture toughness were reduced due to application of the cyclic load. To investigate why the fracture toughness was reduced, it was assumed that the ductile crack extension was enhanced by the cyclic load. It was concluded that the reduction in the fracture toughness due to application of the cyclic load could be attributed to the fatigue crack growth. The fatigue crack growth was brought about not only by the unloading cycles but also by monotonic loading. The growth of the ductile crack extension was well predicted by considering the fatigue crack growth and the apparent crack growth caused by crack tip blunting.
机译：众所周知，环状载荷的弹性塑性断裂韧性小于单调负荷的韧性。该研究旨在研究由于施用循环载荷而降低碳钢的断裂韧性的根本原因。首先，使用板标本进行疲劳裂纹生长试验，用于全逆转各种应力幅度的完全反转负载。推出引用有效应变强度因子范围的裂纹生长方程，以预测裂纹增长至0.5mm /循环。然后，使用相同的材​​料来进行单调和环状负载条件的断裂韧性试验。使用板材标本来使得在测试期间能够测量标称菌株。结果表明，由于循环载荷的施用，J-R曲线和J（0.2）断裂韧性降低。为了调查裂缝韧性的原因，假设通过环状载荷提高了延性裂纹延伸。得出结论是，由于循环载荷的施用而导致的断裂韧性的降低可能归因于疲劳裂纹生长。疲劳裂纹增长不仅由卸载循环引起，而且通过单调载荷引起。通过考虑疲劳裂纹的裂纹生长和由裂纹尖端钝化引起的表观裂缝生长，延伸延伸延伸的生长。

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