中厚板减薄过程残余应力的演变行为

 针对中厚板使用过程中的变形行为，研究了中厚板因减薄引起横向残余应力重新分布规律。基于剥层法理论建立了中厚板减薄过程中残余应力分布模型和挠曲变形模型，应用有限元分析法模拟了厚板减薄过程。对比分析了残余应力分布形式和中厚板挠曲变形程度的计算结果和有限元仿真模拟结果，验证了两种分析方法的可行性，并进一步分析了应力分布状态及厚板减薄方式对薄板减薄过程变形的影响。结果表明，两种分析结果都能反映中厚板减薄变形特征，但有限元仿真模拟方法能够随薄板减薄而改变中厚板约束状态，结果更为准确；中厚板内部原始残余应力分布状态及使用过程减薄方式对其减薄过程变形有重要影响，为中厚板的合理生产设计和使用提供理论依据。

Evolution characteristics of residual stresses in medium-thick plate during thinning process

The redistribution law of the transverse residual stress due to the thinning of the medium and heavy plate was studied to understand the deformation mechanism of the medium-thick plate in service. Based on the theory of the peeling method，the residual stress distribution model and the deflection deformation model in the thinning process of the medium-thick plate were established，and the plate thinning process was simulated by the finite element method. The results of the residual stress distribution and the deflection degree of the plate were compared with those of the finite element simulation，which verified the feasibility of the two methods. Furthermore，the effect of the stress distribution and the thickness reduction on the thinning process was further analyzed. The results showed that both analysis results could reflect the deformation characteristics of the plate thinning process，but the results of the finite element simulation method were more accurate，which changed the restraint state of plate with thinning process. The research results provide a theoretical basis for the rational production design and use of medium-thick plate.