A fiber fabric unit-cell model based on FEM-SPH coupling algorithm and application on analyses of hypervelocity impact
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摘要: 目前,对纤维织物超高速碰撞过程中的变形、断裂、破碎等力学行为已有较广泛的研究,但对碰撞过程中纱线间接触问题的分析尚未见公开文献报道。考虑纱线间的相互作用,建立了纤维织物的FEM-SPH耦合单胞模型,该模型不仅能够进行纤维织物超高速碰撞过程中的穿孔断裂、破碎、碎片云扩展等损伤行为分析,还能够进行纱线间的接触作用过程分析。结果表明,该模型分析结果与试验结果具有较好的一致性。
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关键词:
- 纤维织物 /
- 超高速碰撞 /
- FEM-SPH耦合算法 /
- 单胞模型 /
- 空间碎片
Abstract: The deformation, fracture, and fragmentation of fiber fabric happened in the process of hypervelocity impact have been widely researched. However, the analysis of the contact between yarns during the impact has not been reported. Considering the contact behavior between fabric fibers, a unit cell model for fiber fabric was established, based on the FEM-SPH coupling algorithm. The model can be used to analyze the damage behavior such as the perforation, fracture, fragmentation, and cloud propagation, as well as provide the mechanical information of the interaction process between yarns during the hypervelocity impact between fiber fabric and space debris. The analysis results obtained by the model are in good agreement with experimental measurements.-
Key words:
- fiber fabric /
- hypervelocity impact /
- FEM-SPH coupling algorithm /
- unit-cell model /
- space debris
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Parameter Value ρ/(g·cm−3) 1.45 Ea/GPa 164.0 Eb/GPa 3.28 Ec/GPa 3.28 νab 0.01 νbc 0.01 νca 0.01 Gab/GPa 3.28 Gbc/GPa 3.28 Gca/GPa 3.28 σfail/GPa 3.88 εfail 0.045 Notes: E, ν and G—Elastic modulus, Poisson′s ratio and shear modulus, respectively; σfail—Failure stress; εfail—Failure strain. Parameter Value ρ/(g·cm−3) 2.78 G/GPa 27.5 A/MPa 369 B/MPa 684 n 0.73 C 0.0083 Tr 273 Tm 775 m 1.7 Cp/(J·(kg·K)−1) 875 Γ 2.0 C/(m·s−1) 5 328 S1 1.338 a 0.875 Notes: ρ—Density; G—Shear modulus; A—Yield strength; B—Strain hardening parameter; n—Strain hardening parameter; C—Strain rate sensitivity constant; m—Thermal softening parameter; Tr—Reference temperature; Tm—Melting temperature; Cp—Specific heat capacity; Γ—Mie-Gruneisen gamma; S1—Mie-slope; C—Reference speed of sound; a—First order volume correction coefficient. 表 3 纤维织物靶板吸能特性
Table 3. Comparison of energy absorption results of fabric target plates
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