聚烯烃弹性体的力学性能及对床垫体压分布的影响  

Mechanical properties of polyolefin elastomer and its effect on pressure distribution of mattress body

作　　者：潘宏阳 陈宗勇 廖廷茂 袁鸿[1,3] PAN Hongyang;CHEN Zongyong;LIAO Tingmao;YUAN Hong(Institute of Applied Mechanics,MOE Key Laboratory of Disaster Forecast and Control in Engineering,Jinan University,Guangzhou 510632,China;Vonature Co,Ltd,Guiyang 550000,China;School of Architectural Engineering,Guangzhou Institute of Science and Technology,Guangzhou 510540,China)

机构地区：[1]暨南大学重大工程灾害与控制教育部重点实验室,应用力学研究所,广州510632 [2]大自然科技股份有限公司,贵阳550000 [3]广州理工学院建筑工程学院,广州510540

出　　处：《中国塑料》2023年第11期24-34,共11页China Plastics

基　　金：黔科合GZ字(2014)3016。

摘　　要：选择聚烯烃弹性体(POE)作为床垫的芯层材料,通过对POE试件进行静力学测试和疲劳耐久性测试,比较分析各试件的加载变形曲线,探讨POE的抗疲劳压缩性能、支撑性能影响因素。同时,选择二阶Ogden模型和三参数Mooney-Rivlin模型表征POE的非线性力学行为,简化人-床界面接触过程,利用有限元评估出POE床垫的减压性能。结果表明:POE的厚度、硬度损失两者之间无明显的几何关系,并未随着密度的增大显著增大,密度对最小静态缓冲系数影响不大;POE压缩系数大于2.8,硬度压力值达到0.77 N/cm^(2),满足不同重量的人对床垫材料的支撑要求;二阶Ogden模型和三参数Mooney-Rivlin模型具备预测POE材料大变形的能力,但三参数Mooney-Rivlin模型在描述小变形范围内存在不足;2种密度的POE床垫较于乳胶/山棕床垫应力传导均匀、层次分明,峰值压力减压百分比最高达94.11%、94.23%,足以满足日常生产生活的需要。In this paper,polyolefin elastomer(POE)was selected as the core material for the mattress.Through the static and fatigue durability tests towards POE specimens,the loading deformation curves of each specimen were compared and analyzed,and the influencing factors of POE on their antifatigue compression and support performance were discussed.Meanwhile,the nonlinear mechanical behavior of POE was characterized by choosing the 2nd-order Ogden model and the 3rd-parameter Mooney-Rivlin model to simplify the humanbed interface contact process.The pressurereducing performance of the POE mattress was evaluated through finite elements.The results indicated that there was no apparent geometric relationship between the thickness and hardness loss of POE,which seems not to increase significantly with an increase in the density.The density had little effect on the minimum static buffer coefficient.The compression coefficient of POE was greater than 2.8,and the hardness pressure reached 0.77 N/cm^(2).These results can meet the support requirements of people with different weights for mattress materials.The 2nd-order Ogden model and the 3-parameter Mooney-Rivlin model have an ability to predict the large deformation of POE materials.However,the 3-parameter Mooney-Rivlin model is insufficient in describing the small deformation range.The POE mattress with two densities was more uniform and hierarchical in stress transmission than the natural latex/palm fiber mattress.The peak pressure decompression percentage was as high as 94.11% and 94.23%,which was enough to meet the requirement of daily production and life.

关 键 词：聚烯烃弹性体 力学性能 超弹性模型 有限元仿真 减压性能 

分 类 号：TQ325.1[化学工程—合成树脂塑料工业]