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首页> 外文期刊>Key Engineering Materials >Effect of Cyclic Loading on Crack Propagation of X-70 Pipeline Steel in Near-Neutral pH Solution
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Effect of Cyclic Loading on Crack Propagation of X-70 Pipeline Steel in Near-Neutral pH Solution

机译：循环载荷对X-70管线钢在近中性pH溶液中裂纹扩展的影响

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摘要

Crack propagation of X-70 pipeline steel in near-neutral pH solution was studied under different modes of cyclic loading. A revised equation of crack growth rate vs. △ K was obtained. Average crack growth rate increased with cycles under conditions of different R values. Linear shape notch specimen made cracks much easier to initiate and propagate than V-shaped notch specimen did. For different R values, the curves of crack growth rate with cycles were similar, but the platform propagation period and quick propagation period were different obviously. Crack growth rate at both periods increased and thus failure time decreased markedly with decrease of R value. The propagation directions of cracks were different under different cyclic loading conditions. Under mode I (single tensile stress) cyclic loading, cracks were straight and perpendicular to the tensile stress axis, while under mixed-mode Ⅰ/Ⅲ (tensile/shear stress) cyclic loading, cracks were sinuous and did not propagate in the direction perpendicular to the main tensile stress axis.
机译：研究了X-70管线钢在不同循环载荷模式下在近中性pH溶液中的裂纹扩展。得到了裂纹扩展速率与△K的修正方程。在不同R值的条件下，平均裂纹扩展速率随循环而增加。线性缺口样品比V形缺口样品更容易引发和扩展裂纹。对于不同的R值，裂纹扩展速率与循环的曲线相似，但平台的传播周期和快速传播的周期明显不同。随着R值的降低，两个时期的裂纹扩展速率均增加，因此失效时间明显减少。在不同的循环载荷条件下，裂纹的扩展方向不同。在I型（单拉伸应力）循环载荷下，裂纹是笔直且垂直于拉伸应力轴的；而在I / III混合模式（拉伸/剪切应力）循环载荷下，裂纹是弯曲的，并且不在垂直方向上扩展到主要拉伸应力轴。

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