本发明涉及属于汽车用复合材料研究领域,涉及一种长纤维增强复合热塑性复合材料能量吸收模型建立方法；包括以下步骤：1、建立不同厚度和质量分数落锤冲击计算模型；2、研究落锤回弹时LFT平板能量吸收特性；3、对不同纤维质量分数不同厚度LFT平板进行非线性拟合,获得落锤临界穿透速度和最小穿透能量；4、建立能量吸收分析模型；5、验证能量吸收分析模型。本发明考虑复合材料应变率效应,拟合得到平板临界穿透速度和最小穿透能量；本发明以最小穿透能量为归一化参数建立表征冲击能量与吸收能量关系的分析模型,预测不同工况复合材料能量吸收量。

The invention relates to the research field of composite materials for automobiles, and relates to a method for establishing an energy absorption model of a long-fiber reinforced composite thermoplastic composite material; including the following steps: 1. Establishing a falling weight impact calculation model for different thicknesses and mass fractions; 2. Studying a falling weight Energy absorption characteristics of the LFT plate during rebound; 3. Non-linear fitting of LFT plates with different fiber mass fractions and thicknesses to obtain the critical penetration velocity and minimum penetration energy of the drop weight; 4. Establish an energy absorption analysis model; 5. Validation Energy absorption analysis model. The present invention considers the strain rate effect of the composite material, and obtains the critical penetration speed and the minimum penetration energy of the flat panel by fitting; the present invention uses the minimum penetration energy as the normalized parameter to establish an analysis model that characterizes the relationship between impact energy and absorbed energy, and predicts different work The energy absorption capacity of composite materials.