摘要
考虑纱线截面的变化、相互挤压,建立了三维四向复合材料内部单胞、表面单胞及角胞细观模型。对三种单胞模型施加了相应的周期性边界条件,采用刚度体积平均法,建立了三维四向复合材料刚度预测模型,预测了切边和非切边三维四向碳/碳复合材料纵向弹性模量。结果表明,三单胞预测模型在材料宽度为8、13、16、21mm的预测值时,与试验平均值的误差分别为18.3%、5.8%、4.2%和5%,模型预测精度在材料宽度增加时,预测精度明显提高,当材料宽度大于13mm时,能较好的预测三维四向碳/碳复合材料纵向弹性模量,且三单胞模型的预测精度显著优于内部单胞模型。
The interior unit cell,surface unit cell and corner unit cell of three-dimensional four directional composites were established in mesoscopic scale,and the models considered the changes of the yarn cross section and mutual extrusion.Applying the corresponding periodic boundary conditions,and using the stiffness volume average method,the threedimensional four directional composites stiffness prediction models were established.The longitudinal elasticity modulus of trimming and non-trimming three-dimensional four directional carbon/carbon composites were predicted.The results show that the predicted values of 8,13,16,21 mm width three-dimensional four directional carbon/carbon composites and experimental values have 18.3%,5.8%,4.2%and 5%errors,respectively.The prediction results have a higher precision when widening the specimens,and the three unit cells＇model has good precision in longitudinal elasticity modulus which is much better than that of interior unit cell method when the width of specimens is over 13 mm.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2017年第11期2721-2728,共8页
Journal of Aerospace Power
基金
江苏省高校研究生创新基金(KYLX_0238)
中央高校基本科研基金(1002-56XQA15002)
关键词
三维四向
内部单胞
表面单胞
角胞
刚度体积平均法
three-dimensional four directional
interior unit cell
surface unit cell
corner unit cell
stiffness volume average method
