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首页> 外文期刊>The Journal of Strain Analysis for Engineering Design >A general autofrettage model of a thick-walled cylinder based on tensile-compressive stress-strain curve of a material
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A general autofrettage model of a thick-walled cylinder based on tensile-compressive stress-strain curve of a material

机译：基于材料的拉-压应力-应变曲线的厚壁圆筒通用自紧模型

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摘要

The basic autofrettage theory assumes elastic-perfectly plastic behaviour. Because of the Bauschinger effect and strain-hardening, most materials do not display elastic-perfectly plastic properties and consequently various autofrettage models are based on different simplified material strain-hardening models, which assume linear strain-hardening or power strain-hardening or a combination of these strain-hardening models. This approach gives a more accurate prediction than the elastic-perfectly plastic model and is suitable for different strain-hardening materials. In this paper, a general autofrettage model that incorporates the material strain-hardening relationship and the Bauschinger effect, based upon the actual tensile-compressive stress-strain curve of a material is proposed. The model incorporates the von Mises yield criterion, an incompressible material, and the plane strain condition. Analytic expressions for the residual stress distribution have been derived. Experimental results show that the present model has a stronger curve-fitting ability and gives a more accurate prediction. Several other models are shown to be special cases of the general model presented in this paper. The parameters needed in the model are determined by fitting the actual tensile-compressive curve of the material, and the maximum strain of this curve should closely represent the maximum equivalent strain at the inner surface of the cylinder under maximum autofrettage pressure.
机译：基本的自动加强理论假设弹性完全是塑性行为。由于包辛格效应和应变硬化，大多数材料没有弹性表现出完美的塑性，因此，各种自动强化模型都基于不同的简化材料应变硬化模型，这些模型假定采用线性应变硬化或功率应变硬化或两者结合。这些应变硬化模型。与完全弹性的塑性模型相比，此方法可提供更准确的预测，并且适用于不同的应变硬化材料。本文提出了一种基于材料实际拉伸-压缩应力-应变曲线的，结合了材料应变-硬化关系和包辛格效应的通用自增强模型。该模型包含了冯·米塞斯屈服准则，不可压缩的材料和平面应变条件。推导了残余应力分布的解析表达式。实验结果表明，该模型具有更强的曲线拟合能力，并且给出了更准确的预测。其他几种模型被证明是本文提出的通用模型的特例。模型中所需的参数是通过拟合材料的实际拉伸压缩曲线确定的，该曲线的最大应变应紧密代表最大自紧压力下气缸内表面的最大等效应变。

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