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针对加捻植物纤维增强树脂基复合材料偏轴拉伸非线性力学行为展开研究,以宏、细观相结合的思路,建立了融合植物纤维微纤丝角、纱线加捻表面捻转角和复合材料偏轴拉伸角的多层次角度融合本构模型,在实际计算时,由于微纤丝角的随机性、难于测量和对复合材料偏轴拉伸性能相对表面捻转角和偏轴拉伸角的较小影响,假定微纤丝角是常量,计算时仅考虑表面捻转角和偏轴拉伸角,适当简化。最后,本文利用单向亚麻纤维织物增强环氧树脂基复合材料拉伸实验数据和文献数据验证模型的有效性,模型计算结果与实验结果吻合较好。
Aiming at the non-linear mechanical behavior of twisting plant fiber reinforced resin matrix composites during off-axis stretching, a combination of macroscopic and microscopic view was used to establish the relationship between the microfibril angle of plant fiber, twist angle of yarn twisting surface and composite In the actual calculation, due to the randomness of the microfibril angle, it is difficult to measure and compare the relative surface twist angle and off-axis drawing angle , Assuming that the microfibril angle is a constant, only the surface twist angle and the off-axis stretch angle are taken into account in the calculation, appropriately simplified. Finally, the uniaxial flax fiber reinforced tensile test data and literature data are used to verify the validity of the model. The calculated results are in good agreement with the experimental results.