基于RVE模型的开孔层合板拉伸强度不确定性分析OA

Aiming at the problem of dispersion of mechanical properties of open-hole laminates due to fiber and pore inhomogeneity during material preparation,this study develops an algorithm for generating a three-phase RVE model with randomly distributed fibers-substrate-pores,performs macro-and fine-scale progressive damage analyses of open-hole laminates,and solves for the sensitivities of the dimensions of the fibers and pores(Rf,Rv)and the vol-ume fractions(Vf,Vv)by using a polynomial chaos expansion method,to realize the uncertainty prediction of tensile strength of open-hole laminates.The analytical results show that under the combined effect of Vf decrease and Vv in-crease,the maximum decrease in the elastic performance parameters of the open pore plywood is 29.47%,and the ul-timate load decrease is 14.51%,which are significantly more than the corresponding maximum decreases caused by the changes of a single parameter(Vf or Vv)by 19.5%and 10.94%,respectively.For the failure displacements of open-hole laminates,the parameter influences were ranked as Vf>Rf>Vv>Rv;for the ultimate loads of open-hole laminates,the parameter influences were ranked as Vv>Vf>Rv>Rf.Which showed that the effects of the changes in volume fraction were greater than the effects of the changes in dimensions.