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钻孔法测量焊接残余应力误差因素分析

甘世明,韩永全,陈芙蓉

甘世明,韩永全,陈芙蓉. 钻孔法测量焊接残余应力误差因素分析[J]. 焊接学报, 2018, 39(10): 48-53. DOI: 10.12073/j.hjxb.2018390247
引用本文: 甘世明,韩永全,陈芙蓉. 钻孔法测量焊接残余应力误差因素分析[J]. 焊接学报, 2018, 39(10): 48-53. DOI: 10.12073/j.hjxb.2018390247
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GAN Shiming, HAN Yongquan, CHEN Furong. Analysis on error factors of welding residual stress measured by hole drilling method[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(10): 48-53. DOI: 10.12073/j.hjxb.2018390247
Citation: GAN Shiming, HAN Yongquan, CHEN Furong. Analysis on error factors of welding residual stress measured by hole drilling method[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(10): 48-53. DOI: 10.12073/j.hjxb.2018390247
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钻孔法测量焊接残余应力误差因素分析

Analysis on error factors of welding residual stress measured by hole drilling method

摘要

    摘要
  • 摘要: 为提高焊接残余应力钻孔法测量结果的可靠性，需分析其测量过程中的误差因素，依据误差传递理论推导了由应变误差与释放系数误差传递给最终测量结果的误差公式，并由测量过程中的误差因素建立了一条影响最终测量结果的误差链. 以2A12高强铝合金VPPA-MIG复合焊接板材为试验对象，定量分析了误差链中的弹性模量误差、贴片误差和应变读数取值时间误差传递到最终结果中的相对误差. 结果表明，由弹性模量误差传递到残余应力σ1，σ2中的相对误差均很小；由贴片误差传递到残余应力σ1，σ2和?角中的相对误差在贴片24 h后均降为0%；由应变取值时间误差传递到残余应力σ1，σ2和?角中的相对误差在应变释放150 min后均降为0%.
    Abstract: In order to improve the reliability of measuring results of welding residual stress, it is needed to analyze the error factors in the process of the residual stress measured by hole drilling method. The error expression where strain error and release coefficient error are passed to the final measuring result has been derived according to the theory of error propagation and one error chain that affects the accuracy of final measurement result is established by the influencing factors of actual measurement error. Taking 2A12 high strength aluminum alloy plates after VPPA-MIG hybrid welding into measuring experiment, the relative error of final measuring that results from the error of elastic modulus, the error of strain gauge paste and the time error of strain reading in the error chain are quantitatively analyzed. The relative error of residual stresses σ1 and σ2 from the error of elastic modulus are both very small. The relative error of residual stresses σ1, σ2 and ? angle from the error of strain gauge paste all reduce to 0% after the strain patch is pasted for 24 hours. The relative error of residual stresses σ1, σ2 and ? angle from the time error of strain reading all reduce to 0% after 150 minutes of strain release.
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    • 参考文献(18)
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  • 收稿日期:  2018-04-24

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