The effectiveness evaluation of 314L stainless steel vibratory stress relief by dynamic stress
The effectiveness evaluation of 314L stainless steel vibratory stress relief by dynamic stress
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DOI：
10.1016/j.ijfatigue.2006.02.047
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发表时间：
2007-01-01
影响因子：
6
通讯作者：
Ni, C.
中科院分区：
文献类型：
--
作者：
Rao, D.;Wang, D.;Ni, C.
振动时效（VSR）是利用振动动态应力消除残余应力的一种工艺。目前，实时、定量地评估振动时效的有效性是一个重要问题。振动时效过程中施加在焊接结构上的循环载荷或动应力直接影响残余应力的降低。本文研究了304 L不锈钢焊接试件在振动时效过程中的循环应力和应变，提出了304 L不锈钢振动时效的循环蠕变机理。在实验的基础上，提出了动态应力作用下残余应力松弛的数学模型。应用该模型对HT-7 U托卡马克焊接结构制造过程中振动时效的有效性进行了评估。计算结果与实测值相比，残余应力降低了约11%.结果表明，利用动应力进行振动时效效果评价是可行的。(c)2006爱思唯尔有限公司保留所有权利。
Vibratory stress relief (VSR) is a procedure to reduce the residual stress by means of vibrating dynamic stress. Currently, real-time and quantitative evaluating the effectiveness of VSR is an important problem. Cyclic loading, or dynamic stress, imposed on the welded structure during VSR affect the reduction of residual stresses directly. This paper examines the cyclic stress and strain of type 304L stainless steel welded specimens and presents the cyclic creep mechanism during VSR of 304L. According to the experiments, a mathematic model of residual stress relaxation proposed which conducted against dynamic stress. The model is applied to evaluate the effectiveness of VSR during manufacturing HT-7U Tokamak welded structure. The difference of residual stress decrease between the calculated and measured is about 11%. The result shows that the effectiveness evaluation of VSR using dynamic stress is practical. (c) 2006 Elsevier Ltd. All rights reserved.