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首页> 外文期刊>Proceedings of the institution of mechanical engineers >Inductive quantification of energy absorption of high-density polyethylene foam for repeated blunt impact
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Inductive quantification of energy absorption of high-density polyethylene foam for repeated blunt impact

机译：高密度聚乙烯泡沫对反复钝击的能量吸收的归纳量化

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摘要

Foams are used in a variety of impact energy absorption applications because of their ability to engage in large deformations under steady load transfer during the cell collapse. Quantification of the energy absorption capabilities of foams, including those resulting from repeated loading and unloading, is critical to both modeling and prototype development of systems utilizing these important materials. This paper details a novel process of characterizing a cross-linked high-density polyethylene foam for its applicability within helmet liners designed for low-velocity blunt impact. The foams are characterized using various forms of compression testing and physical measurements. The analyses include examination of the tangent modulus, strain hardness, energy absorption ideality, and energy absorption efficiency. Together, these analyses identify the regions of changing behavior of the nonlinear impact absorption material system. A case study for the materials is presented, which reveals that the examined high-density polyethylene foam exhibits some of the most efficient impact properties during the first impact. However, this case study also identifies that those impact properties can reduce significantly, e.g. a 55% increase in stress in the case of a 0.50 strain-level deformation in the first impact, for a subsequent impact after only a 120 s rest period. The novel combination of testing and analysis presented within this paper enables the developer of a foam energy absorption system to advance their interrogation of foams for repeated large strain deformations and temperature variations.
机译：由于泡沫能够在电池塌陷期间在稳定的载荷传递下发生较大的变形，因此泡沫可用于各种冲击能量吸收应用中。泡沫的能量吸收能力的量化，包括由于反复加载和卸载而产生的能量吸收能力，对于使用这些重要材料的系统的建模和原型开发都是至关重要的。本文详细介绍了一种新的表征交联高密度聚乙烯泡沫的方法，该方法适用于设计用于低速钝击的头盔衬里。使用各种形式的压缩测试和物理测量来表征泡沫。分析包括切线模量，应变硬度，能量吸收理想性和能量吸收效率的检查。这些分析共同确定了非线性冲击吸收材料系统行为变化的区域。提出了一种针对该材料的案例研究，该案例研究表明，经检查的高密度聚乙烯泡沫在首次冲击过程中表现出一些最有效的冲击性能。但是，此案例研究还确定了这些冲击特性会大大降低，例如在第一次冲击中变形水平为0.50的情况下，应力增加55％，而在仅120 s的休息时间之后的后续冲击中。本文中提出的测试和分析的新颖组合使泡沫能量吸收系统的开发人员能够进行对泡沫的询问，以实现重复的大应变变形和温度变化。

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