Characterization of the tool/fabric and fabric/fabric friction for woven-fabric composites during the thermostamping process
Characterization of the tool/fabric and fabric/fabric friction for woven-fabric composites during the thermostamping process
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DOI：
10.1007/s12289-011-1072-5
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发表时间：
2013-06-01
影响因子：
2.4
通讯作者：
Chen, Julie
中科院分区：
文献类型：
--
作者：
Fetfatsidis, Konstantine A.;Jauffres, David;Chen, Julie
对复合热冲压过程中工具/织物和织物/织物界面处 TwintexA (R) 混合玻璃-聚丙烯平衡平纹织物和不平衡斜纹织物的动态摩擦系数进行了表征。研究了在类似于热冲压过程的条件下织物速度和压力对摩擦系数的影响。基于实验结果开发了考虑压力和速度依赖性的唯象摩擦模型，并通过用户定义的子程序将其实现到商业有限元代码 ABAQUS/Explicit 和 LS-DYNA 中。使用介观方法对织物的机械行为进行建模。摩擦子程序通过实验摩擦测试的有限元模型进行验证。使用 ABAQUS 和 LS-DYNA 模拟半球形圆顶的形成。对可变摩擦模型和恒定摩擦模型之间的冲头力和纱线应力进行了比较，仿真结果证明了可变摩擦模型准确预测零件质量的必要性。
The dynamic coefficients of friction for TwintexA (R) commingled glass-polypropylene balanced plain-weave and unbalanced twill-weave fabrics at the tool/fabric and fabric/fabric interfaces during the composite thermostamping process are characterized. The effects of fabric velocity and pressure on the coefficients of friction under conditions similar to those during the thermostamping process are studied. A phenomenological friction model accounting for pressure and velocity dependence is developed based on the experimental results and implemented into the commercial finite element codes ABAQUS/Explicit and LS-DYNA via user-defined subroutines. The mechanical behavior of the fabric is modeled using a mesoscopic approach. The friction subroutines are validated with a finite element model of the experimental friction test. The forming of a hemispherical dome is simulated using ABAQUS and LS-DYNA. Punch forces and yarn stresses are compared between variable friction and constant friction models, and the simulation results justify the necessity for a variable friction model to accurately predict part quality.