毫米级球状沙尘颗粒连续冲击损伤的力学模型与数值模拟研究  

Mechanical Modeling and Numerical Simulation for Continuous Impact Damage of Sand Particles

作　　者：游文俊 王计真 杨强[2] 詹志新 胡伟平[1] You Wenjun;Wang Jizhen;Yang Qiang;Zhan Zhixin;Hu Weiping(Beihang University,Beijing 100191,China;Aviation Key Laboratory of Technology and Science on Structure Impact Dynamics,AVIC Aircraft Strength Research Institute,Xi’an 710065,China)

机构地区：[1]北京航空航天大学,北京100191 [2]中国飞机强度研究所结构冲击动力学航空科技重点实验室,陕西西安710065

出　　处：《航空科学技术》2023年第1期84-96,共13页Aeronautical Science & Technology

基　　金：航空科学基金(20200041051001)。

摘　　要：在服役环境中,航空发动机叶片易受到沙尘颗粒的连续冲击作用,产生凹陷、撕裂、微裂纹等损伤,从而影响其高周疲劳性能。为保证航空发动机的结构完整性和安全可靠性,有必要深入分析沙尘颗粒连续冲击对叶片造成的影响。本文基于损伤力学理论,开展了毫米级球状沙尘颗粒连续冲击损伤的力学模型与数值模拟研究。首先,推导了损伤耦合的J-C本构模型和连续冲击损伤模型,给出了材料参数的标定方法。其次,基于ABAQUS平台,编写Vufield子程序和Python脚本,实现了连续冲击损伤的数值计算。通过将计算结果与文献中的试验数据进行对比,验证了该方法的有效性。最后,分别进行单个和多个沙粒连续冲击的数值模拟,分析了冲击变形、残余应力和冲击损伤的变化规律。单个沙粒连续冲击叶片的计算结果表明,冲击凹坑深度、冲击残余应力的影响跨度及最大冲击损伤随冲击速度、沙粒尺寸和冲击次数的增大而增大。针对两种不同的随机冲击方式,多个沙粒连续冲击叶片的计算结果表明,沙粒个数越多,最大冲击凹坑深度越深,冲击损伤主要发生在沙粒与叶片接触部位,冲击损伤随冲击次数变化呈阶段性突增。In the service environment,the aero-engine blade is vulnerable to the continuous impact effect of sand and dust particles,which makes the blade produce dents,tears,micro-cracks and other damage,thus affecting the high cycle fatigue properties of the blade.In order to ensure the structural integrity and safety reliability of the aero-engine,it is necessary to analyze the impact of continuous impact of sand and dust particles on the blade in depth.Based on the damage mechanics theory,studies are carried out on the mechanical modeling and numerical simulation for the continuous impact damage of sand particles.Firstly,the J-C constitutive model coupled with damage and the continuous impact damage model are derived,and the calibration method of material parameters is presented.Secondly,based on the ABAQUS platform,the Vufield subroutine and the Python script are written to implement the numerical calculation of the continuous impact damage.The effectiveness of the method is verified by the comparison between the experimental data and computed results.Finally,the numerical simulations of continuous impacting of single and multiple sand particles are conducted to analyze the variation laws of impact deformation,residual stresses and impact damage.For the impact of single sand particle,it is observed that the impact pit depth,impact residual stress influence span and maximum impact damage increase with the increase of impact speed,sand size and the number of impacts.For the two different random impact modes,the computed results of multiple sand particles reveals that the more the number of sand particles,the deeper the maximum impact pit depth.The impact damage mainly occurs in the contact area between the sand particles and blade,and the impact damage shows a sudden increase in phase with the number of impact.

关 键 词：连续冲击 损伤 力学模型 数值模拟 二次开发 

分 类 号：V215[航空宇航科学与技术—航空宇航推进理论与工程]