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采用非织造结合热压成型工艺制备了亚麻落麻纤维增强聚乳酸(PLA)基可降解复合材料(亚麻落麻/PLA),研究了纤维体积分数对材料拉伸强度的影响,并利用Kelly-Tyson拉伸强度预测模型及相关修正理论,提出了非连续植物纤维增强可降解复合材料(D-NFRBC)强度预测模型,该模型考虑了纤维长度、取向角、直径、强度概率分布及材料界面剪切强度与材料中纤维临界长度、纤维极限拉伸强度三者间制约关系对复合材料强度的影响。结果表明:亚麻落麻/PLA拉伸强度在纤维体积分数为39.6%时达到最大,应用本文建立的强度预测模型所得亚麻落麻/PLA拉伸强度预测值与实验值吻合良好。
Flax fiber-reinforced polylactic acid (PLA) -based composites (flax / hemp / PLA) were prepared by non-woven and thermocompression molding. The effects of fiber volume fraction on the tensile strength of the fiber were studied. The Kelly- Tyson tensile strength prediction model and the corrective theory, the prediction model of non-continuous plant fiber-reinforced biodegradable composites (D-NFRBC) is proposed. The model considers the fiber length, orientation angle, diameter, strength probability distribution and material interface shear The relationship between the shear strength and the critical length of the fiber in the fiber and the ultimate tensile strength of the fiber have an impact on the strength of the composite. The results showed that the tensile strength of flax / PLA reached the maximum when the volume fraction of fiber was 39.6%. The predicted value of flax / PLA tensile strength obtained from the strength prediction model established in this paper was in good agreement with the experimental data.