Low velocity impact resistance of woven fabric reinforced T-shaped composites
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摘要: 为解决当前T字型铺层复合材料抗层间剪切能力弱的问题，通过对复合材料预制件织造工艺进行合理设计，使用SGA598小样织机织造了T字型织物，采用真空辅助树脂传递模塑(VARTM)工艺将其制备成复合材料，并研究其在低速冲击下的抗冲击性能；使用有限元软件ABAQUS建立了几何与材料模型，模拟了不同冲击能量下的冲击响应过程。研究结果表明，T字型加筋板具有较高的抗冲击能力，模拟结果与实验测试结果吻合较好，该有限元模型具有较好的可靠性。Abstract: In order to solve the problem of weak interlaminar shear resistance of T-shaped laminate composites, the weaving process of composite preform was reasonably designed, and the T-shaped fabric was woven by SGA598 small sample loom. The T-shaped fabric was prepared by vacuum assisted resin transfer molding (VARTM) process, and its impact resistance under low velocity impact was studied. The geometric and material models were established by using the finite element software ABAQUS to simulate the impact response process under different impact energies. The results show that the T-shaped stiffened plate has high impact resistance, and the simulation results are in good agreement with the experimental results. The finite element model has good reliability.
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图 1 T字型加筋板径向截面示意图
Figure 1. Warp section schematic diagram of T-shaped stiffened plate
H—Total height of fabric; H1—Rib height of the stiffened plate; H2—Floor height; L—Bar width
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图 3 T字型加筋板截面与纱线屈曲状态
Figure 3. Warp section schematic diagram of T-shaped stiffened and yarn buckling state
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图 4 不同冲击能量下T型加筋板载荷峰值
Figure 4. Peak load of T-stiffened plate under different impact energies
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图 7 T型加筋板1/4冲击载荷与边界条件模型
Figure 7. 1/4 impact load and boundary condition model of T-stiffened plate
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图 10 纱线局部坐标与单胞全局坐标
Figure 10. Yarn local coordinates and unit cell global coordinates
W—Unit cell width; L—Unit cell length; L1—Weft width; L2—Binding width; W1—Warp width; W2—Binding length; H1—Weft height; H2—Warp height
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图 11 试验与有限元模拟(FEM)的机织T型加筋板载荷-时间曲线
Figure 11. Test and finite element modelling (FEM) load-time curves of woven T-stiffened plate
EX—Text
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图 12 试验与FEM的机织T型加筋板收能量-时间曲线
Figure 12. Absorb energy-time curves of test and FEM of woven T-stiffened plate
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图 13 机织T型加筋板试验与有限元模拟冲击正面、背面图
Figure 13. Front and back view of impact of experiment and FEM of woven T-stiffened plate
表 1 环氧树脂JC-03 A的规格和性能
Table 1 Specifications and properties of epoxy resin JC-03 A
Material function Numerical value Density/(g·cm−3) 1.12-1.14 Tensile strength/MPa 80 Tensile modulus/MPa 2400 Bend strength/MPa 130 Flexural modulus/MPa 3500 Curing time/h 5-7 Thermal expansion coefficient/(10−6 ℃−1) 37 Curing temperature/℃ 70 
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表 2 T型加筋板复合材料规格
Table 2 Specifications of T-stiffened plate composites
Specification Numerical value Length/mm 150 Width/mm 50 Thickness of base plate/mm 5 Rib height/mm 5
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表 3 正交各向异性复合材料力学性能参数
Table 3 Mechanical property parameters of orthotropic composites
Elastic constant Numerical value Young's modulus, E1/MPa 4644 Young's modulus, E2/MPa 5627 Young's modulus, E3/MPa 3705 Shear modulus, G23/MPa 1744 Shear modulus, G13/MPa 1633 Shear modulus, G12/MPa 1855 Poisson’s ratio, ν23 0.32 Poisson’s ratio, ν13 0.33 Poisson’s ratio, ν12 0.19
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表 4 机织T型加筋板 FEM与实验测试误差
Table 4 FEM and experimental test error of woven T-stiffened plate
Energy/J Load peak error/% Maximum absorption
energy error/%20 2.4 2.0 30 4.4 3.6 50 7.2 −2.4 80 2.6 −1.5
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