本发明公开了一种长纤维增强热塑性复合材料多尺度仿真方法,为解决长纤维增强热塑性复合材料由于应变率效应和各向异性的力学特性在仿真中很难准确模拟的问题,步骤：1.对LFRP平板进行不同方向不同应变率下的拉伸试验；2.对LFRP平板测试区域进行x射线CT扫描；3)对LFRP平板进行多尺度仿真验证：1)粘弹粘塑性材料模型及失效；2)仿真验证：使用ABAQUS软件与Digimat软件耦合建立仿真有限元模型,仿真计算三个应变率下的拉伸试验,其中0.001s-1和1s-1采用隐式算法,100s-1采用显示算法；令有限元样件模型一端固定,另一端延长度方向施加载荷,仿真计算得的各力学特征曲线与试验数据进行对比。

The present invention discloses a multi-scale simulation method of long fiber reinforced thermoplastic composite material, in order to solve the problem that long fiber reinforced thermoplastic composite material is difficult to accurately simulate in simulation due to the strain rate effect and anisotropic mechanical properties, the steps are: 1. Carry out tensile tests on the LFRP plate under different directions and different strain rates; 2. Carry out X-ray CT scan on the test area of the LFRP plate; 3) Carry out multi-scale simulation verification on the LFRP plate: 1) Viscoelastic viscoplastic material model and failure; 2) Simulation verification: use ABAQUS software and Digimat software to couple to establish a simulation finite element model, simulate and calculate the tensile test at three strain rates, of which 0.001s-1 and 1s-1 use implicit algorithms, and 100s-1 use display algorithms ; Make one end of the finite element sample model fixed, and apply a load in the direction of extension at the other end, and compare the mechanical characteristic curves calculated by the simulation with the test data.