泡沫硅橡胶的力热响应特性实验  

Thermal and Mechanical Response Characteristics of Silicone Rubber Foam

作　　者：伍璧超 卢玉斌[1] 

机构地区：[1]西南科技大学制造过程测试技术教育部重点实验室,四川绵阳621010

出　　处：《高分子材料科学与工程》2015年第11期130-136,共7页Polymer Materials Science & Engineering

基　　金：留学回国人员科技活动项目择优资助(14zd3102);西南科技大学研究生创新基金项目(14ycx119)

摘　　要：利用三维数字散斑动态变形测量分析技术联合材料试验机对泡沫硅橡胶进行准静态拉伸、压缩实验,获得其在不同应变率、不同取样方向、不同温度等条件下的力热响应特性。实验结果表明,在拉伸和压缩实验中都具有不太显著的应变率效应及一定的温度效应,压缩试验中的温度敏感性要强于拉伸试验,且其拉伸强度和屈服应力随温度的升高而降低;拉伸试验和压缩试验中试件力学性能都表现为各向异性;压缩实验中试件尺寸的不同对研究其力学性能几乎没有影响;拉伸试验中试件因泡孔壁沟槽的产生而破坏,压缩试验中试件由于泡孔受力压溃而出现裂痕;试验过程中试件内部温度在破坏时达到最高,试件不同位置处的温度变化情况基本一致,最大温升为2℃左右,可视为是等温实验,表明其实验结果是可靠、有效的。Based on the three-dimensional digital specMe dynamic deformation measurement and anatysis techniques together with the material testing system, quasi-static tensile and compression tests of silicone rubber foam （SR） were performed. The thermal and mechanical behavior of SR under various conditions such as different strain- rates, sampling directions and temperatures were obtained. Experimental results show that, under the investigated conditions, the strain-rate effect and temperature effect in both tension and compression experiments of SR are not quite obvious. However, the temperature sensitivity in compression tests is stronger than that in tensile tests, and the tensile strength and yield strength of SR decrease with the increase of temperature. The specimens show anisotropic behavior in compression tests and in tensile tests. Different specimen sizes of compression tests have negligible influence on the mechanical behavior of SR. The damage of specimens in tensile tests is observed to be caused by the production of bubble hole groove, but the failure of compression specimens is due to the collapse of cells under external loading. When the destruction of specimens occurs, the internal temperature of specimens reaches highest. Temperature variations at different locations of specimens are basically identical, and the maximum temperature rise is about 2℃. Therefore, experiments conducted in this study can be regarded as isothermal tests, and experimental results shown above are reliable and effective.

关 键 词：泡沫硅橡胶 力学性能 数字图像相关 真实应力-应变曲线 

分 类 号：TQ333.93[化学工程—橡胶工业]