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首页> 外文会议>Asia-Pacific Symposium on Engineering Plasticity and Its Applications(AEPA 2004) pt.2; 20040922-26; Shanghai(CN) >Autofrettage analysis of thick-walled cylinder based on tensile-compressive curve of material
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Autofrettage analysis of thick-walled cylinder based on tensile-compressive curve of material

机译：基于材料拉伸压缩曲线的厚壁圆筒自紧分析

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The basic autofrettage theory is based on the elastic-perfectly plastic body. Real materials are not elastic-perfectly plastic, so there are some different autofrettage models based on different simplified material strain-hardening behaviors. Those models give more precise solutions than that of elastic-perfectly plastic model, and each of them suits for different strain-hardening material. In this paper, the tensile-compressive curves of several materials used for the autofrettaged thick-walled cylinder have been analyzed. All of those materials are of behaviors of loading linear strain-hardening or loading elastic-perfectly plastic and unloading power function hardening stress-strain relationship. Based on the actual tensile-compressive curve of material and modified yield criterion, an autofrettage model considering this type of material strain-hardening relationship and Bauschinger effect has been proposed. The analytic expressions of residual stress distribution have been obtained by the analysis. The optimum clasto-plastic radius and optimum autofrettage pressure have been discussed. The data of autofrettage experiments using different steels reported in the literature were used to exam the validity of this model, it shows that this model can give more accurate results. Those parameters needed in this model are determined by curve fitting of the tensile-compressive curve of the material.
机译：基本的自动加强理论是基于弹性完美的塑性体。实际材料不是具有完美弹性的塑料，因此基于不同的简化材料应变硬化行为，存在一些不同的自动强化模型。这些模型比弹性完全塑性模型提供了更精确的解决方案，并且每种模型都适合于不同的应变硬化材料。在本文中，分析了用于自动装填厚壁圆筒的几种材料的拉伸-压缩曲线。所有这些材料具有加载线性应变硬化或加载弹性完美塑性以及卸载幂函数硬化应力-应变关系的行为。基于材料的实际拉伸压缩曲线和修正的屈服准则，提出了一种考虑这种材料的应变硬化关系和鲍辛格效应的自增强模型。通过分析得到了残余应力分布的解析表达式。讨论了最佳的弹塑性半径和最佳的自动强化压力。利用文献中报道的不同钢种进行的自动强化试验数据验证了该模型的有效性，表明该模型可以给出更准确的结果。该模型中所需的那些参数由材料的拉伸-压缩曲线的曲线拟合确定。

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