| 摘要: |
| 目的 研究发泡聚乙烯( EPE) 缓冲衬垫在受到内装产品长期静态压载后的缓冲特性变化规律。方法 设定 2 个不同负载(15 . 3 ,22 . 2 kg) 模拟某一类电子产品自重,并设置对照组,预载时间为 72 h,进行静、动态缓冲特性实验,对比分析 EPE 产生不同程度的永久变形后,在不同预载量下的应力- 应变曲线、最大加速度-静应力曲线及缓冲系数-最大应力曲线。 结果 预载使 EPE 静压的屈服阶段变短,吸能特性降低,最小加速度增大,最小缓冲系数增大。 结论 蠕变会显著降低 EPE 的缓冲性能,在对发泡材料进行缓冲特性研究时,应增加对材料初始形态的预处理,使其更加符合实际使用状况。 |
| 关键词: EPE 蠕变 永久变形 最大加速度 缓冲系数 |
| DOI： |
| 分类号:TB485.1;TB487 |
| 基金项目: |
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| Effects of Cushion Property of Foamed Polyethylene EPE Cushioning Material Exerted by the Creep |
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LIU Ji-fei1, HAN Xue-shan2, WANG Wei2, GE Jie1
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1.Tianjin University of Science and Technology, Tianjin 300222, China;2.China Packaging Research & Test Center, Tianjin 300457, China
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| Abstract: |
| Objective To analyze the changing characteristics of foamed polyethylene EPE cushion after a long time of product loading. Methods Two different load weights (-15. 3, 22. 2 kg) were set to simulate the weight of certain electronic product in this controlled study, with a preloading of 72 h, and the deformation of the internal buffer material after long time stacking compression was checked. Then the stress-strain curves, the maximum acceleration-static stress curves and cushion coefficient-maximum static stress curves under two different pre-loading weights were compared. Results Preloading could shorten the yield segments, decrease the property of energy-absorbing, and increase the minimal acceleration values and minimal cushion coefficient values. Conclusion Preloading could greatly weaken the cushioning performance of EPE buffer material. It is recommended that pre-conditioning should be done prior to the dynamic test for expanded materials, therefore it could better resemble the actual using condition. |
| Key words: EPE creep permanent deformation maximum acceleration cushion coefficient |
