平面编织复合材料层板弹性性能的预测

THEORETICAL PREDICTION OF ELASTIC BEHAVIOUR OF PLAIN WEAVE COMPOSITE LAMINAE

本文在平面编织纤维增强树脂复合材料的单方向直波纹模型的基础上,分别采用经典层合板理论和有限元应变能等效方法,预测了平面编织复合材料层合板迭层对其弹性性能的影响。根据经典层合板理论,由对平面织物复合材料的单向直纹模型的上、下表面施加不同的约束条件,得出层板弹性常数变化范围。用有限元能量法,则预测出不同铺层数的编织复合材料层板的弹性性能。与实验结果比较,表明纵向模量的预测是可靠的。

The present paper deals with the problem of the micromeehanics analysis of tho elastic constants of a one-ply plain weave composite and plain weave cemposite laminae. By assuming a straight undulation in one direetion only the plain weave composite is modeled. Based on the straight undulation model of a plain weave reinforced resin lamina, the prediction of elastic behaviour of plain weave laminae- has been presented by both the Classical Lamination Theory (CLT) and the Strain Energy Equivalency Principle (SEEP) , from which the elastic properties are determined by equating the composite strain (or complementary) energy to the summation of tho constituent material strain (or complementary) energies.The bounds of the laminae elastic moduli are given by different constraint conditions applied on the top and bottom surfaces of a plain weave laminae based on the CLT, while tho elastic constants of the laminae with different ply number are piesonted based on the SEEP.They give tho relationship between the micromechanical aspects of the woven fabric structure and the macro-mechanical properties of the fabric composite. The predictions are confirmed by some limited experimental data available.