Effect of pre-strain on low cycle fatigue strength of austenitic stainless steel SUS316NG

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2011-12-01 DOI:10.1299/KIKAIA.77.843

Shota Hasunuma, Y. Miyata, T. Ogawa, K. Sakaue

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引用次数: 13

Abstract

Low cycle fatigue tests were performed for austenitic stainless steel, SUS316NG. The effect of pre-strain history on the crack growth was investigated in detail using cellulose acetate replicas. In strain range, Δe = 2.5 % and 8 % constant tests, cracks initiated from slip bands near grain boundary, while intergranular crack initiations were prevailing when Δe = 16 % constant test. The cracks grew with several coalescences until the final fracture. Pre-strains were applied at Δe = 8 or 16 % followed by fatigue loading at Δe = 2.5 %.These tests revealed that contribution of cyclic strain hardening and softening were remarkable depending on the pre-strain history. Crack growth characteristics were well evaluated by J integral range, ΔJ, which is an elasto-plastic fracture mechanics parameter. Crack growth characteristic under Δe-constant tests as well as the pre-strained tests coincided with that measured by fracture mechanics experiment. Fatigue crack growth rates were predicted by elasto-plastic fracture mechanics approach in conjunction with cyclic stress-strain response.

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预应变对SUS316NG奥氏体不锈钢低周疲劳强度的影响

对奥氏体不锈钢SUS316NG进行了低周疲劳试验。利用醋酸纤维素试样，详细研究了预应变历史对裂纹扩展的影响。当应变范围Δe = 2.5%和8%恒定时，裂纹从晶界附近的滑移带开始，而当Δe = 16%恒定时，裂纹主要是从晶间开始。裂纹以几次合并的方式不断扩大，直到最终断裂。预应变施加在Δe = 8或16%，然后疲劳加载在Δe = 2.5%。这些试验表明，循环应变硬化和软化的贡献显著取决于应变前历史。J积分范围ΔJ是一种弹塑性断裂力学参数，可以很好地评价裂纹扩展特征。Δe-constant试验和预应变试验下的裂纹扩展特征与断裂力学试验结果一致。采用弹塑性断裂力学方法结合循环应力-应变响应预测疲劳裂纹扩展速率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Transactions of the Japan Society of Mechanical Engineers. A

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