Moderate energy impact analysis combining phenomenological contact law with localised damage and integral equation method
Moderate energy impact analysis combining phenomenological contact law with localised damage and integral equation method
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DOI：
10.1016/j.ijimpeng.2011.11.008
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发表时间：
2012-05
影响因子：
5.1
通讯作者：
A. McMillan;C. Aceves;M. Sutcliffe
中科院分区：
文献类型：
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作者：
A. McMillan;C. Aceves;M. Sutcliffe
基于模态分析和局部接触力-偏转模型，已经开发出一种计算影响分析方法。接触定律基于赫兹接触理论，而接触应力是弹性的，定义了修正的接触理论以考虑局部永久压痕，并考虑卸载期间的弹性恢复。该模型通过玻璃-碳混合编织复合材料板的冲击测试进行了实验验证。样本安装在支撑框架中，接触力是通过高速摄影测量的冲击器的减速度推断出来的。对面板和支撑框架组件进行有限元分析以计算模态响应。新的接触模型在预测中等能量冲击 (15 J) 的峰值力和冲击持续时间方面表现良好，其中接触应力局部超过线性弹性极限，并且可能被视为已发生损坏。 C 扫描测量显示，冲击能量在 30-50 J 范围内会造成严重损坏。对于这种情况，新模型的预测可能会通过卸载阶段接触定律滞后的表征以及根据冲击过程中获得的损坏水平修改弹性振动响应来改进。
A computational impact analysis methodology has been developed, based on modal analysis and a local contact force-deflection model. The contact law is based on Hertz contact theory while contact stresses are elastic, defines a modified contact theory to take account of local permanent indentation, and considers elastic recovery during unloading. The model was validated experimentally through impact testing of glass-carbon hybrid braided composite panels. Specimens were mounted in a support frame and the contact force was inferred from the deceleration of the impactor, measured by high-speed photography. A Finite Element analysis of the panel and support frame assembly was performed to compute the modal responses. The new contact model performed well in predicting the peak forces and impact durations for moderate energy impacts (15 J), where contact stresses locally exceed the linear elastic limit and damage may be deemed to have occurred. C-scan measurements revealed substantial damage for impact energies in the range of 30–50 J. For this regime the new model predictions might be improved by characterisation of the contact law hysteresis during the unloading phase, and a modification of the elastic vibration response in line with damage levels acquired during the impact.