用逐层钻孔的小孔法测量非均匀残余应力
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O348; TG115; TH113

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Measurement of Non-uniform Residual Stresses by Incremental Hole-Drilling Method
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    摘要:

    针对传统的小孔法只能测量试件内沿深度方向均匀分布的残余应力,采用逐层钻孔的小孔法测量试件中的非均匀残余应力,通过有限元法标定计算校准系数矩阵,构建了一种实用的非均匀应力测试技术。首先,用ANSYS软件构造试件和应变花粘贴的三维有限元模型,采用分层加载的办法实现各层校准系数的仿真计算,标定计算出钻孔深度达到h=0.5D使应力完全释放时,用5步逐层钻孔法构造5层不均匀应力所需的校准系数矩阵;然后,利用标定出的校准系数矩阵,采用5步逐层钻孔的实验方法,测量构建Cr12MoV淬火件的5层非均匀残余应力,并与传统的小孔法进行测试比对。结果表明:用有限元仿真的方法可以模拟试件中的非均匀残余应力场,用于标定计算测量所需的校准系数矩阵;通过5步逐层钻孔实验测量,可以构建出Cr12MoV淬火件的5层不均匀残余应力。

    Abstract:

    While conventional hole-drilling methods can only measure uniform residual stresses along a specime′s depth, an incremental hole-drilling method is used to measure non-uniform residual stresses inside a specimen. The calibration constants matrix is calculated using the finite element calibration method, and a practical measurement technology of non-uniform stress is established. An agglutinate 3-D finite element model of a specimen with rosette is built using ANSYS software, and the calibration constants in each layer are calculated with a dividing-layer loading method. The calibration constants matrix is obtained when the hole depth reaches h=0.5 D to completely release residual stresses, and is used to form the five layer non-uniform stresses with the five-step hole-drilling method. Then, the five-step incremental hole drilling method and the calculated calibration constants matrix are used to experimentally measure the non-uniform residual stresses within the Cr12MoV quenching specimens. Comparing these measurements with the results of conventional hole-drilling methods shows that the finite element calibration method can simulate non-uniform residual stresses field inner specimen to calculate the calibration constants matrix. In addition, the five-step incremental hole-drilling results show that the five-layer non-uniform residual stresses can be built up in Cr12MoV quenching specimens.

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  • 在线发布日期: 2014-08-07
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