基于声发射非线性模型的损伤状态转变的评估

Change estimation of damage with acoustic emission nonlinear behavior model

建立了声发射非线性模型来监测和评估16Mn钢试样在拉伸过程中的损伤状态的转变.首先,建立声发射突变模型,判断试样在拉伸过程中从弹性损伤状态转变为屈服损伤状态可能的时间点.然后,根据声发射参数的特点和突变量的变化,建立声发射突变复检模型,从而得到试样在拉伸过程中从弹性损伤状态转变为屈服损伤状态确切的时间点.试验结果表明:应用声发射非线性模型可以快速、预先预测出材料损伤状态的转变.

An acoustic emission nonlinear behavior model which consists of acoustic emission（AE） cusp and review model was established,which can estimate the changed time at which the state of 16Mn steel was changed from elastic deformation to yield deformation.Firstly,some preliminary changed time at which the state of 16Mn steel plate specimen might be changed from elastic deformation to yield deformation was estimated with AE cusp model.Next,all preliminary changed time was rechecked by the review model,and the analytical changed time from elastic deformation to yield deformation of 16Mn steel was obtained.The experiment results show that the analytical changed time which was estimated by acoustic emission nonlinear behavior model was ahead of the actual time which was estimated by the load-time curve.Therefore,the acoustic emission nonlinear behavior model is helpful to monitor the safety and reliability of 16Mn steel structure on line.