聚氨酯复合泡沫塑料的动态压缩力学性能  

Mechanical Properties of Polyurethane Syntactic Foams Under Dynamic Compression

作　　者：卢子兴[1] 严寒冰[1] 王建华[2] 

机构地区：[1]北京航空航天大学固体力学研究所,北京100083 [2]中国工程物理研究院化工材料研究所,四川绵阳621900

出　　处：《中国塑料》2004年第3期67-70,共4页China Plastics

基　　金：NSAF联合基金(10 2 760 0 4);国家自然科学基金 (10 0 72 0 0 7)资助项目

摘　　要：针对几种不同密度、不同玻璃微珠填充比的聚氨酯复合泡沫塑料进行了动态压缩实验 ,研究了这类材料的宏观动态力学性能。结果表明 ,动态应力 -应变曲线与准静态压缩加载下的应力 -应变曲线具有相同的特征 ,也分为弹性区、平台区和致密区 ;在较大的应变率范围内 ,复合泡沫塑料的应变率效应是明显的 ,高密度复合泡沫塑料的屈服强度随应变率的增加而增加 ,而中、低密度材料的屈服强度则先随应变率的增加而提高 ,然后在某一高应变率下强度反而下降 。Dynamic compressive experiments were carried out with an SHPB testing set for polyurethane (PU) foam with different densities and different volume fraction of hollow glass micro spheres. The dynamic stress strain curves are similar to those obtained in the experiments of quasi static compression and can also be divided into the elastic region, yielding region and densification region. In a large range of strain rates, the PU foam shows significant strain rate effects. The yielding strength of high density foam increases with increasing strain rates. However, the yielding strength of moderate density foam increases first and subsequently decreases with increasing strain rates, which indicated the softening of the materials.

关 键 词：复合泡沫塑料 力学性能 动态压缩 聚氨酯 应变率效应 

分 类 号：TQ328[化学工程—合成树脂塑料工业]