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X射线衍射法测量残余应力的相对误差及不确定度评定

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Indexed by:期刊论文

Date of Publication:2018-08-15

Journal:宇航材料工艺

Volume:48

Issue:4

Page Number:71-74

ISSN No.:1007-2330

Key Words:钛合金;X射线衍射;残余应力;误差;不确定度

Abstract:利用原位拉伸机进行单轴连续加载,对X射线法测量钛合金残余应力的应力增量进行验证;依据JJF 1059.1-2012标准,对钛合金高应力标样(-659±35)MPa的测量不确定度进行评定.结果表明,X射线衍射法测得残余应力的增量与理论计算应力增量有较好的一致性,随着应力水平的增加,应力增量的相对误差保持在11%以内.以测量重复性、应力常数K、应力因子M为不确定度分量对测量不确定度进行了评定,所得扩展不确定度为±32 MPa.

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