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建立了国-Ⅴ柴油机活塞、活塞销、连杆和缸套等的有限元模型;利用非线性有限元软件ABAQUS分别计算了该柴油机活塞在最大热负荷工况下的温度场和热机耦合工况下的变形和应力,确定了活塞的最大热负荷区和最大应力区,并对活塞和缸套的接触应力进行了分析。模拟结果表明:活塞喉口部位承受最大热负荷,其温度为321.6℃,低于活塞材料的极限温度;在热机耦合工况下活塞裙部的最大应力为58MPa、最大变形为0.1mm,都在可接受范围之内;同时,活塞与缸套的最大接触应力为29.4MPa,在许用应力范围内。通过上述对国-Ⅴ柴油机活塞强度及变形的分析,可以判定此活塞结构能够满足设计要求。
The finite element model of the piston, piston pin, connecting rod and cylinder liner of the national-V diesel engine was established. The nonlinear finite element software ABAQUS was used to calculate the temperature field and the thermal-mechanical coupling condition of the piston of the diesel engine under the maximum thermal load condition Under the deformation and stress to determine the piston maximum heat load zone and the maximum stress zone, and piston and cylinder liner contact stress was analyzed. The simulation results show that the piston throat portion is subjected to the maximum thermal load, its temperature is 321.6 ℃, which is lower than the limit temperature of the piston material. The maximum stress of the piston skirt is 58MPa and the maximum deformation is 0.1mm Acceptable range; the same time, the piston and cylinder liner maximum contact stress of 29.4MPa, within the allowable stress range. Through the above analysis of the national-V diesel piston strength and deformation, we can determine the piston structure to meet the design requirements.