Characterization of the Tensile Behavior of Expanded Polystyrene Foam as a Function of Density and Strain Rate,Advanced Engineering Materials

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Characterization of the Tensile Behavior of Expanded Polystyrene Foam as a Function of Density and Strain Rate
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-08-13 , DOI: 10.1002/adem.202000794
Dimitris Zouzias ₁ , Guido De Bruyne ₂ , Ramon Miralbes ₃ , Jan Ivens ₁

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Expanded polystyrene (EPS) foam is a material, frequently used in a range of applications for its good energy absorption, thermal insulation, durability, and acoustic absorption. In this wide range of applications, the material undergoes a variety of loads that can extend from static to dynamic. When it comes to crush applications, these loading profiles create the need of well‐defined compression and tensile properties for a range of densities and strain rates. Herein, static and dynamic tension tests are conducted on EPS foam dog‐bone samples for material characterization. The target of the study is to obtain stress–strain curves for a range of densities spreading from 60 to 120 g L⁻¹. For the low‐strain rates, tensile testing machines are used, whereas for the high‐strain rates, a modified drop tower set‐up is used. The influence of the strain rate on the stress–strain behavior, the dynamic strength, Young's modulus, and energy absorption capacities for different foam densities is measured. Furthermore, the experimental results for each density are compared with the predictions of Avalle's model for crushable foams to evaluate the validity of the model. The quality of fit obtained between experimental and theoretical is between 70% and 97% depending on the strain rate.

中文翻译：

发泡聚苯乙烯泡沫的拉伸行为随密度和应变率的变化特征

发泡聚苯乙烯（EPS）泡沫是一种材料，由于其良好的能量吸收，隔热，耐用性和吸声性而经常在各种应用中使用。在如此广泛的应用中，材料承受的载荷可以从静态扩展到动态。在压碎应用中，这些载荷曲线需要在一定范围的密度和应变速率下需要明确定义的压缩和拉伸性能。在此，对EPS泡沫狗骨头样品进行了静态和动态拉伸测试，以进行材料表征。该研究的目标是获得一系列密度从60到120 g L ^-1的应力-应变曲线。对于低应变率，使用拉伸试验机，而对于高应变率，则使用改进的吊塔设置。测量了不同泡沫密度下，应变速率对应力应变行为，动态强度，杨氏模量和能量吸收能力的影响。此外，将每种密度的实验结果与可压碎泡沫的Avalle模型的预测结果进行了比较，以评估该模型的有效性。根据应变率，在实验和理论之间获得的拟合质量在70％至97％之间。

更新日期：2020-08-13

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