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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference vol.7: Operations, Applications, and Components; 20050717-21; Denver,CO(US) >MODEL FOR PREDICTING LASER PEENING RESIDUAL STRESSES IN ARBITRARY 3D BODIES
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MODEL FOR PREDICTING LASER PEENING RESIDUAL STRESSES IN ARBITRARY 3D BODIES

机译：任意3D实体中激光穿透残余应力的预测模型

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摘要

This paper presents a methodology for predicting the residual stress resulting from laser peening treatment of arbitrary 3D bodies. The model consists of three basic steps. First, the inputs to the model are derived from residual stress measurements made on laser peened blocks of the pertinent material. The measured residual stress in the blocks consists of residual stress caused directly by laser peening and residual stress required for equilibrium. The laser peening induced residual stress is converted into an equivalent strain distribution that reproduces the stress state in an elastic model of the original body (called eigenstrain). Second, a finite element model representing the geometry of the actual part is constructed. Third, the laser peening induced eigenstrain is input into the finite element model at the locations where laser peening is to be applied (arbitrary coverage area). Solving for equilibrium provides a prediction for the residual stress resulting from laser peening treatment. The modeling procedure is verified using comparisons with residual stress measurements for specimens containing corner fillets of various sizes. The model predictions correlate well with the residual stress measurements over the range of conditions studied.
机译：本文提出了一种方法，用于预测由任意3D物体的激光喷丸处理产生的残余应力。该模型包括三个基本步骤。首先，模型的输入来自对相关材料的激光喷丸块进行的残余应力测量。块中测得的残余应力包括直接由激光喷丸引起的残余应力和平衡所需的残余应力。激光喷丸引起的残余应力被转换成等效的应变分布，该分布在原始物体的弹性模型（称为本征应变）中重现了应力状态。其次，构建代表实际零件几何形状的有限元模型。第三，在要进行激光喷丸的位置（任意覆盖区域）将激光喷丸引起的本征输入到有限元模型中。解决平衡问题可以预测由激光喷丸处理产生的残余应力。通过与包含各种尺寸拐角圆角的样本的残余应力测量值进行比较，验证了建模过程。模型预测值与所研究条件范围内的残余应力测量值具有很好的相关性。

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