目的 确定HT240材料发动机缸体疲劳寿命,从而验证其可靠性.方法 参照AVL的缸体疲劳试验标准,根据该型发动机的爆发压力,选取一定安全裕度的脉动液压压力,在疲劳试验机上模拟实际工况对四件样品进行缸体脉冲加载试验.结果 在缸体上部易出现裂缝.对缸套的实验数据进行处理,确定了其在运行一定次数下不发生破坏的条件疲劳极限为17.89 MPa.同时明确了缸体主轴承壁在21 MPa下未破坏的循环次数及其他破坏位置.结论 该批次缸体基本满足设计要求.为该材料发动机缸体的批量生产及进一步优化设计提供了理论依据.%Objective To determine the fatigue life and verify its reliability of the HT240 cylinder block. Methods Standard for fatigue test of AVL cylinder block was referred. According to the peak firing pressure of the engine, a certain safety margin of pulsating hydraulic pressure was selected to carry out pulse loading test of the cylinder block by simulating the actual work-ing condition for four pieces of sample on a fatigue test machine. Results Cracks were easy to occur on the upper part of the cylinder block and the condition fatigue limit of the cylinder liner was 17.8 MPa under the condition of running for a certain number of times by the experimental data processing. At the same time, the number of cycles and the failure position of cylinder block main bearing wall at safety pressure of 21 MPa were determined. Conclusion These cylinder blocks basically meet the design requirements. It provides a theoretical basis for the bulk production and further optimization of cylinder blocks.
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