Failure behaviour of metal inserts embedded in CFRP subsequent to thermal, mechanical and cyclic pre-damage
Failure behaviour of metal inserts embedded in CFRP subsequent to thermal, mechanical and cyclic pre-damage
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DOI：
10.1016/j.compstruct.2020.111877
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发表时间：
2020-03
影响因子：
6.3
通讯作者：
M. Muth;F. Pottmeyer;K. Weidenmann
中科院分区：
文献类型：
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作者：
M. Muth;F. Pottmeyer;K. Weidenmann
轻量化设计最有效的实施方式之一是使用碳纤维增强塑料，因为其具有出色的特定机械性能。对于多材料设计，碳纤维增强塑料部件必须与其他部件连接，例如负载框架或功能元件。优选使用嵌入式金属元件，即所谓的嵌件，以避免对复合材料进行钻孔。确保光纤的连续性并且不会出现局部承载应力。在手头的工作中，通过用各种冲击能量对部件进行预损坏来评估冲击损坏对准静态和循环强度的影响。在冲击能量高达 12 J 的情况下，这些部件的机械性能仅略有下降。对于 12 J 到 16 J 之间的冲击能量，机械性能的损失很明显，但仅当冲击能量高于 16 J 时才会发生最终故障。本研究的另一个目的是使用多步测试得出使用寿命预测，并通过实验确定的 S-N 曲线进行验证。由于准静态和循环载荷下发生的损坏机制不同，基于多步测试的使用寿命预测是不可行的，但是给出了基于实验数据的使用寿命预测。
One of the most efficient implementations of lightweight design is the use of carbon fibre reinforced plastics due to their outstanding specific mechanical properties. With respect to multi-material-design, carbon fibre reinforced plastic parts have to be joined to other components such as load frames or functional elements. The use of embedded metal elements, so called inserts, is favoured to avoid drilling of composites. The fibre continuity is ensured and no local bearing stresses occur. In the work at hand the influence of impact damage on the quasi-static and cyclic strength was evaluated by pre-damaging the components by various impact energies. The components show only a minor reduction of the mechanical properties for impact energies up to 12 J. For impact energies between 12 J and 16 J, a loss in the mechanical properties is evident but final failure only occurred for impact energies above 16 J.Another aim of this study was to derive service-life-prognosis using multiple step tests and to validate these with experimentally determined S-N curves. Due to different damage mechanisms occurring under quasi-static and cyclic loads, a service-life-prognosis based on the multiple step tests was not feasible, however, a service-life-prognosis based on the experimental data is given.