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中文摘要：
由于扁挤压筒同时受到内压，预紧，热载荷作用，因此有必要考虑内压-预紧-热载荷的耦合作用。本文运用ANSYS分析软件，利用物理环境分析法建立了三层套组合式扁挤压筒内压-预紧-热载荷耦合有限元模型。模拟结果表明热应力的存在对扁挤压筒的等效应力分布影响较大，可以有效地降低内层套的最大等效应力值，但是扁挤压筒的应力分布形式并未改变，为进一步优化扁挤压筒结构尺寸、装配条件提供参考。同时表明了物理环境分析法分析耦合效应的可行性。
英文摘要：
With the FEA software ANSYS, the coupling model of coupling the pressure-prestress-heat stress flat container of three-layer is built using the physical environment approach. The results show that the presence of the thermal stress hasa great influence on the distributing of the equivalent stress of the flat container. The thermal stress can lower down the maximal equivalent stress effectively, but it cannot change the stress distribution. Pressure pre- stress and thermal stress affect the flat container at the same time, so it is necessary to consider the coupling of the pressure-prestress-thermal stress. The physical environment approach give the approval of the flexibility for coupling analysis, and the support for the design of shrink-fitting and structural optimization of flat container.
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