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在内燃机制造业中,人们正越来越多地用有限元法来分析应力,求解热负荷和(或)机械负荷下的部件弹性应力和新近发展的塑性应力。本文通过把某一中速柴油机的活塞顶作为试验模型来检验各种有限元技术在部件塑性分析中的效果。文章所涉及的内容包括: a)有限元的单元数量和单元类型; b)应力-应变曲线的标绘法; c)材料特性值的精度和形式; d)材料特性值与温度关系的确定方法。有限元法的这些内容以及其他一些问题,例如数据的准备和检验,将在电算费用,计算精度和分析所花的全部时间方面加以论述。
In the internal combustion engine manufacturing industry, people are increasingly using finite element method to analyze stress and solve the component elastic stress and the newly developed plastic stress under thermal load and / or mechanical load. In this paper, the piston top of a medium-speed diesel engine is used as a test model to test the effect of various finite element techniques in the plastic analysis of components. The contents of the article include: a) the number of elements and unit type of the finite element; b) the plotting method of the stress-strain curve; c) the accuracy and form of the material property value; d) the method of determining the relationship between the material property value and the temperature . These elements of the finite element method, as well as other issues such as the preparation and testing of data, will be discussed in terms of the cost of the computer, the accuracy of the calculations, and the total time it takes the analysis.