CAJ | 학술논문

预浸带铺放过程中的温度历程和热应力对复合材料构件成型后的质量有很大的影响. 基于生死单元和循环载荷方法,对预浸带铺放成型复合材料构件的应力场进行了数值模拟,利用ANSYS中间耦合方法,实现铺放过程的温度-应力耦合分析:首先对铺放过程的温度历程进行求解,然后将温度场计算结果作为热载荷进行应力场分析,得到了预浸带铺放过程中构件内部的热应力分布及成型后的残余应力,最后分析了不同铺放参数对残余应力的影响. 研究结果表明:在各层中,第一层的轴向、横向热应力最大,分别为64.8、11 MPa,随着铺放进行,各层自身的热应力逐渐增大;铺放头移动速度一定,热气温度从500 ℃升高到700 ℃时,构件成型后的轴向、横向残余应力分别增大了14、5.5 MPa;热气温度一定,铺放头移动速度从10 mm/s增加到30 mm/s时,构件成型后的轴向、横向残余应力分别减小了23.6、6.12 MPa,随着铺放层数增加,铺放速度对残余应力影响越来越小.
예침대포방과정중적온도역정화열응력대복합재료구건성형후적질량유흔대적영향. 기우생사단원화순배재하방법,대예침대포방성형복합재료구건적응력장진행료수치모의,이용ANSYS중간우합방법,실현포방과정적온도-응력우합분석:수선대포방과정적온도역정진행구해,연후장온도장계산결과작위열재하진행응력장분석,득도료예침대포방과정중구건내부적열응력분포급성형후적잔여응력,최후분석료불동포방삼수대잔여응력적영향. 연구결과표명:재각층중,제일층적축향、횡향열응력최대,분별위64.8、11 MPa,수착포방진행,각층자신적열응력축점증대;포방두이동속도일정,열기온도종500 ℃승고도700 ℃시,구건성형후적축향、횡향잔여응력분별증대료14、5.5 MPa;열기온도일정,포방두이동속도종10 mm/s증가도30 mm/s시,구건성형후적축향、횡향잔여응력분별감소료23.6、6.12 MPa,수착포방층수증가,포방속도대잔여응력영향월래월소.
Temperature history and thermal stress in the process of prepreg tape lay-up have a great influence on the quality of composite component. In this paper, on the basis of life and death unit and cyclic loading method, the process of stress field numer-ical simulation was studied.Temperature stress coupling was studied by using ANSYS intermediate coupling method:First the tem-perature history in the process of lay up was resolved,then temperature field analysis results was taken as the heat load stress field to obtain the distribution of stress and component residual stress. Finally effects of heater air temperature and roller speed on residu-al stress were analyzed. The research results show that the axial/transverse thermal stress of the first layer is the biggest,which are 64.8 MPa,11 MPa respectively;with the increase of placement layers,thermal stress of each layer is gradually increased;roller spee-dremains constant,when the hot air temperature increased from 500℃ to 700℃, axial/transverse residual stress are increased by 14 MPa, 5.5 MPa respectively;hot air temperature remains constant,when roller speed increased from 10 mm/s to 30 mm/s, axial/transverse residual stress are reduced by 23.6 MPa, 6.12 MPa respectively,with the increase of placement layers, the effect of lay up rate on residual stress become smaller.