| Citation: | WANG Yan, WANG Xiaoqing, GUO Shengrong, et al. Fatigue analysis and life prediction method for cylinder block of aviation piston pump[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(7): 1314-1321. doi: 10.13700/j.bh.1001-5965.2018.0646(in Chinese)
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The cylinder block is the crucial part of the aviation piston pump, which can directly affect the function of aviation piston pump. In view of the drawbacks of long test period and lacking theoretical approaches, a method for fatigue analysis and life prediction of the cylinder block is proposed based on finite element method and linear cumulative damage theory. Firstly, the mechanical model of the cylinder block is established using theoretical mechanics and material mechanics, and the force analysis calculation is implemented on MATLAB. Then, the finite element model of the cylinder block is established on ANSYS platform in order to simulate the stress and strain. Further, the results of stress and strain are imported into nCode to find out the weak parts of the cylinder block and investigate the affecting factors of the fatigue life based on linear cumulative damage theory. Finally, the verification test is carried out. The result shows that the outer wall of the piston chamber near the side of the distribution plate is weak and prone to fatigue damage, and the damage part of the experimental pump is approximately coincident with the simulation, which can validate the correctness of method for the fatigue analysis and life prediction of the cylinder block. The study findings of this paper can provide guidelines for designing the cylinder block of compact piston pumps.
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