回温效应对典型泡沫塑料准静态力学特性的影响  

Effect of Temperature Cycle on Quasi-static Mechanical Behavior of Representative Foam Plastics

作　　者：江伟[1] 卢玉斌[1] 苏实[1] 余昆岭 

机构地区：[1]西南科技大学制造科学与工程学院,四川绵阳621010 [2]北京睿拓时创科技有限公司,北京100025

出　　处：《中国塑料》2017年第1期36-42,共7页China Plastics

基　　金：NSAF联合基金(U1430110);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,结合材料试验机对回温处理后的硅橡胶泡沫(SRF)以及硬质聚氨酯泡沫(RPUF)试件进行准静态拉伸、压缩实验研究了回温效应对材料力学特性的影响。结果表明,在准静态拉伸过程中,SRF和高密度RPUF的拉伸强度受回温效应的影响较低密度RPUF显著;SRF的压缩强度和弹性模量均得到了极大提升且弹性变形阶段相对延长,但屈服现象不显著;低密度RPUF的屈服应力显著提高,但屈服台阶缩短,塑性变形降低;高密度RPUF的弹性变形阶段和屈服阶段均有所增加,但其承载抗压强度的能力降低。The quasi-static tensile and compression tests of temperature-cycling treated silicone rubber foam（SRF） and rigid polyurethane foam （RPUF） were conducted to investigate the effect of temperature cycle on their mechanical properties l^y three-dimensional digital speckle dynamic deformation techniques. The results indicated the tensile strength of SRF and high-density RPUF were influenced by temperature cycle more significantly compared with low-density RPUF in the quasi-static tensile process, which led to a remarkable improvement in tensile strength. In the case of SRF, the compressive strength and Young＇s modulus were improved remarkably, and,the elastic deformation was also increased to some extent. However, its yield phenomenon was not so evident. In the case of low-density RPUF, the temperature-cycling treatment led to an improvement in yield stress but resulted in shortening of yield stage and a decrease in plastic deformation. As for the high density RPUF, not only the elastic deformation was improved, but the yield stage was also extended due to the temperature-cycling treatment. However, its loading capability to pressure was reduced in the quasi-static compression process.

关 键 词：硅橡胶泡沫 硬质聚氨酯泡沫 回温效应 应力分布 

分 类 号：TQ328[化学工程—合成树脂塑料工业]