目的 为了研究聚苯乙烯泡沫在连续压缩载荷作用下的力学行为,进行一系列的试验与模型建立研究。方法 首先,利用ogden超弹模型,建立聚苯乙烯泡沫在单次加载条件下的本构模型,并利用试验数据识别了应变率对本构模型的作用规律。然后考虑EPS的应力软化效应,建立EPS在卸载与再次加载条件下的Mullins效应本构模型。最后建立易损件-质量主体-EPS泡沫系统动力学模型,预测质量主体加速度-时间曲线、易损件加速度曲线以及易损件冲击响应谱。结果 理论预测结果与试验结果的良好吻合,验证了本文所建立的本构模型与动力学模型的正确性与可靠性,所得结果可为EPS缓冲设计提供分析手段。结论 EPS缓冲系统在连续冲击载荷下具有良好的缓冲性能。
Abstract
The work aims to carry out a series of experiments and theoretical studies to study the mechanical behavior of polystyrene foam under consecutive impact loads. Firstly, the ogden hyperelastic model was used to establish a constitutive model of polystyrene foam under single-loading conditions, and the action law of strain rate on the constitutive model was identified according to the experimental data. Then, considering the stress softening effect of EPS, a constitutive model of the Mullins effect of EPS under unloading and reloading conditions was established. Finally, a dynamic model of the vulnerable parts-mass body-EPS foam system was established to predict the acceleration-time curve of the mass body, the acceleration curve of the vulnerable parts, and the impact response spectrum of the vulnerable parts. The acceleration pulse predicted by the constitutive relation is in good agreement with the experimental results, which proves the correctness and reliability of the constitutive mode and the dynamic model established . The results obtained can be applied to the buffer design of EPS. The EPS cushioning system exhibits excellent shock absorption performance under continuous impact loads.
关键词
聚苯乙烯泡沫 /
连续冲击 /
本构模型 /
动态响应
Key words
polyethylene foam /
consecutive impact /
constitutive model /
dynamic responses
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参考文献
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基金
湖南省教育厅科学研究重点项目（22A0397）; 国家自然科学基金（11402232）
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