Modelling of chip separation in machining unidirectional FRP composites by stiffness degradation concept
Modelling of chip separation in machining unidirectional FRP composites by stiffness degradation concept
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DOI：
10.1016/j.compscitech.2009.01.004
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发表时间：
2009-04-01
影响因子：
9.1
通讯作者：
El Mansori, M.
中科院分区：
文献类型：
--
作者：
Lasri, L.;Nouari, M.;El Mansori, M.
使用正交加工中的有限元分析研究了单向玻璃纤维增强聚合物复合材料 (FRP) 的渐进失效。通过降低材料性能来模拟切屑形成过程和损伤模式，例如基体开裂、纤维基体脱粘和纤维断裂。使用 Hashin、最大应力和霍夫曼失效准则进行损伤分析。检测到损坏后，对工件材料进行选择性刚度降低。本研究的目的是更好地了解切屑形成过程，并分析从起始阶段到完全切屑形成的切削引起的损伤。使用不同的失效准则研究了纤维取向对切削力和亚表面损伤的影响。结果根据加工过程中复合材料结构的切削力演变和损伤进展进行了讨论。事实证明，使用刚度退化概念和适当的失效准则可以以可预测的方式响应 FRP 加工过程中切屑形成过程的变化。 (C) 2009 Elsevier Ltd. 保留所有权利。
Progressive failure of unidirectional glass fiber-reinforced polymer composites (FRP) was studied using finite element analysis in orthogonal machining. Chip formation process and damage modes such as matrix cracking, fiber-matrix debonding and fiber breaking were modelled by degrading the material properties. Damage analysis was carried out using Hashin, Maximum stress and Hoffman failure criteria. After damage was detected, selective stiffness degradation was applied to the workpiece material. The objective of this study is to better understand the chip formation process and to analyse the cutting-induced damage from initiation stage until complete chip formation. The effect of the fiber orientation on cutting forces and sub-surface damage was investigated with different failure criteria. The results were addressed in terms of cutting forces evolution and damage progression in the composite structure during machining. It was demonstrated that the use of the stiffness degradation concept with the appropriate failure criterion responds potentially in a predictable fashion to changes in chip formation process for machining of FRPs. (C) 2009 Elsevier Ltd. All rights reserved.