3D打印硅橡胶泡沫的压缩力学及长时应力松弛行为研究  

Study on Compression Mechanics and Long-Term Stress Relaxation Behavior of 3D Printed Silicone Rubber Foam

作　　者：肖体伟 陈勇前 徐小博 邵虹[2] 李洁华[1] 谭鸿[1] 唐昶宇 XIAO Tiwei;CHEN Yongqian;XU Xiaobo;SHAO Hong;LI Jiehua;TAN Hong;TANG Changyu(College of Polymer Science and Engineering,Sichuan University,State Key Laboratory of Polymer Materials Engineering,Chengdu 610065,China;Development Center of Chengdu Science&Technology,China Academy of Engineering Physics,Chengdu 610200,China)

机构地区：[1]四川大学高分子科学与工程学院,高分子材料工程国家重点实验室,成都610065 [2]中国工程物理研究院成都科学技术发展中心,成都610200

出　　处：《有机硅材料》2024年第6期1-6,共6页Silicone Material

基　　金：NASF联合基金(U1930204);四川省科技计划(2022YFS0559)。

摘　　要：以3D打印硅泡沫为研究对象,通过对其压缩应力应变曲线和原位压缩图像的分析,解释了不同压缩应变下的力学响应行为。结果表明:随打印层数增加,压缩平台高度降低而平台宽度增加,这与硅泡沫的应力“长柱”效应有关。进一步选用了层数为12层的3D打印硅泡沫,对其在机械-温度场作用下的应力松弛行为进行分析,发现机械作用和温度对应力松弛的增大有耦合作用,在50%压缩应变和353.15 K温度下其载荷保持率为0.89,在所有试样中最低。最后通过时温等效原理对3D打印硅泡沫的长时应力松弛行为进行了预测。结果表明:在298.15 K温度下,当硅泡沫处于密实化阶段时,其载荷保持率下降最快。但相较于无序泡沫,打印泡沫的长时应力松弛更低,以1年的时长为例,3D打印硅泡沫的载荷保持率为0.87,无序发泡硅泡沫的载荷保持率为0.82,这可能得益于其均匀的压缩应力分布。这项研究为理解和预测3D打印硅泡沫在不同压缩应变的长时应力松弛性能提供了参考。Compression stress-strain and in-situ compression of 3D printed silicone foam have been analyzed,and the mechanical response behavior under different compression strains has been explained.The results show that with the increase of printing layers,the height of the compression platform decreases while the width increases,which is related to the long column effect of the silicone foam.Furthermore,the 3D printed silicone foam with 12 layers was selected to analyze its stress relaxation behavior under the mechanical temperature field.The results show that the mechanics and temperature will greatly increase the stress relaxation,with the lowest load retention rate of 0.89 at 50%compression strain and 353.15 K.Finally,we predict the long-term stress relaxation behavior of 3D printed silicone foam by time-temperature equivalence principle.At the room temperature of 298.15 K,the load retention rate of silicone foam decreases the fastest when the foam is compressed.However,compared with disordered foam,the foam has a lower long-term stress relaxation,showing greater advantages,which may be due to its uniform compressive stress distribution.It provides a reference for predicting the long-term stress relaxation properties of 3D printed silicone foam under different compression strains.

关 键 词：3D 打印 硅泡沫 压缩 应力松弛 时温等效原理 

分 类 号：TQ333.93[化学工程—橡胶工业]