活塞式铝合金蠕变性能的比较评价

Q4 Engineering
A. Marchenko, V. Pylyov, O. Linkov, S. Lykov
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引用次数: 0

摘要

本文讨论了发动机在提高功率过程中活塞材料的可靠性问题。在确保环境和经济要求的同时,提高发动机的升功率正是当今发动机制造的主要工作领域之一。研究表明,材料蠕变对内燃机零件的可靠性有显著影响。热负荷最大的发动机元件是活塞。可以确定其主要关键区域:燃烧室边缘,活塞环和活塞裙的区域。有时甚至在发动机初始试验中,在发动机功率增加时,也会观察到活塞裙部出现抽搐现象。因此,我们可以谈谈确定活塞材料达到临界状态的原因的问题的相关性。根据这些数据,可以制定保证活塞可靠运行的措施。制造活塞最常用的材料是铝合金AL25和AK4。这些合金的化学成分差别很大。研究得到了计算这些材料蠕变速率的系数。对铝合金在不同应力水平、不同温度下的蠕变变形进行了识别计算。在温度和应力方面,确定了模型适当区域的上界。分析了铝合金在不同温度下的蠕变速率。在结论中,对活塞材料进行了比较,指出了AK4合金与AL25合金相比在发动机功率增大时所显现出的优势。指出了进一步研究的方向,这与分析所考虑的材料在蠕变第一阶段的变形有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
COMPARATIVE EVALUATION OF THE CREEP OF PISTON ALUMINUM ALLOYS
The paper deals with the issues of reliability of piston materials in the process of increasing engine power. It is precisely the increase in the liter power of engines while ensuring environmental and economic requirements that is today one of the main areas of work in engine manufacturing. Studies have shown that material creep has significantly affects on the reliability of internal combustion engine parts. The most thermally loaded engine element is a piston. The main critical areas for it can be identified: the edge of the combustion chamber, the area of the piston rings and the piston skirt. The appearance of seizures on the piston skirt is sometimes observed even during the engine initial tests at the engine power increasing. Thus, we can speak about the relevance of the problem of identifying the reasons for reaching the critical state of the piston material. Based on these data, it becomes possible to develop measures to ensure the reliable operation of the piston. Among the most common materials for the manufacture of pistons are aluminum alloys AL25 and AK4. The chemical composition of these alloys varies considerably. The study obtained coefficients for calculating the creep rate for these materials. The identification of the calculation of the creep deformation of aluminum alloys at different stress levels, for different temperatures is carried out. The upper boundary of the region of model adequacy in terms of temperatures and stresses is determined. The creep rate of aluminum alloys is analyzed at different temperatures. In the conclusions, a comparison of the piston materials is made and the advantages of the AK4 alloy in comparison with the AL25 alloy, which are coming out when the engine power is increased, are indicated. The direction of further research is also indicated, which is associated with the analysis of the deformation of the considered materials at the first stage of creep.
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