铝合金工字梁预弯喷丸成形曲率半径建模  

Curvature Radius Modeling for Aluminum Alloy I-beam Prebending Shot Peening

作　　者：孙小钦 高国强 王永军[1] 肖静怡 王世浩 SUN Xiaoqin;GAO Guoqiang;WANG Yongjun;XIAO Jingyi;WANG Shihao(School of Mechanical Engineering,Northwestern Polytechnical University,Xi'an 710072,China;AVIC Xi'an Aircraft Industry Group Co.,Ltd.,Xi'an 710089,China)

机构地区：[1]西北工业大学机电学院,西安710072 [2]中航西安飞机工业集团有限公司,西安710089

出　　处：《机械科学与技术》2024年第12期2176-2184,共9页Mechanical Science and Technology for Aerospace Engineering

摘　　要：采用等效喷丸成形诱导应力,建立了航空铝合金2024-T351工字梁预弯喷丸成形曲率半径分析数学模型,分析了等效喷丸诱导应力对喷丸成形曲率的影响规律;采用JC(Johnson-Cook)本构模型和代表单元法分析了不同喷丸覆盖率下诱导应力的变化规律,并分析得到24.8%、35.3%和50.3%覆盖率下代表单元尺寸约是冲击区的3.1、3.7和4.4倍时,得到稳定的模拟结果。在此基础上,采用有限元直接应力法分析了有预弯和无预弯情况下喷丸成形的曲率半径的变化规律,通过实验验证了所建立数学模型和有限元模拟模型的有效性。A model for analyzing the curvature radius in the pre-bending shot peening of 2024-T351 I-beam of aviation aluminum alloy was established by using the equivalent shot peening induced stress.The JC(Johnson-Cook)constitutive model and representative volume element method are employed to analyze the variation law of shot peening induced stress under different shot peening coverage rates,as a result that the stable simulation results are obtained when the representative volume element size is 3.1,3.7,4.4 times the size of the impact zone for 24.8%,35.3%,50.3%coverage rates respectively.On this basis,the finite element direct stress method is used to simulate the law of curvature radius in the shot peeningof I-beam with pre-bending and without prebending with defining coverage rate on different zone.A least square method is used to calculate the curvature radius with the coordinate data form simulation result.The effectiveness of the present model and finite element simulation are verified by using experiment.

关 键 词：喷丸成形 2024-T351铝合金 预弯曲 曲率半径 数学模型 有限元模拟 

分 类 号：V262.3[航空宇航科学与技术—航空宇航制造工程]