压缩条件下发泡聚苯乙烯蠕变本构关系及有限元分析  

Constitutive Law for Creep and FEM Analysis of Expanded Polystyrene under Uniaxial Compression

作　　者：刘晓曦[1] 岑国平[1] 

机构地区：[1]空军工程大学工程学院,陕西西安710038

出　　处：《中国塑料》2006年第4期86-90,共5页China Plastics

基　　金：军队科研项目(KH0017001)

摘　　要：为提高应用发泡聚苯乙烯(EPS)工程的长期稳定性,对EPS的蠕变性能进行了试验分析。试验中EPS试件随着密度变小压缩蠕变量的增大幅度逐渐变大,从密度为30．9 kg/m3时的蠕变应变0．8％增加到20．5kg／m3时的 4．9％;随着恒定荷载的增加相同时间所对应的蠕变变形量增大,从荷载40 kPa时的应变0．5％增加到80 kPa时的 3．7％。在试验结果的基础上提出了EPS块体的压缩蠕变本构关系。采用有限元软件对EPS块体的蠕变模型进行分析。两者同现场实测的EPS板蠕变结果进行了比较,三者图形趋势较为一致,说明用该本构模型预测EPS块体的蠕变性能是可行的。In order to improve the long-term stability of expanded polystyrene（EPS） engineering, uniaxial compression creep tests were conducted on EPS board. It was shown that the creep strain increased with the density of EPS specimen and loading, the creep strain of EPS was increased to 4.9 % by 20.5 kg/m^3 from 0.8 % by 30.9 kg/m^3, and the strain was increased to 3.7 % under 80 kPa from 0.5 % under 40 kPa, respectively. Based on these experimental results, the constitutive law of EPS compression creep was established. The finite element software was adopted to study the creep characteristics of EPS board. Compared these creep results to the creep measurement in-situ, it was pointed that the figures of these forecasts and inspection are similar. The result indicates that it is feasible using the model to forecast the creep of EPS board.

关 键 词：发泡聚苯乙烯 蠕变 本构关系 有限元 

分 类 号：TQ325.2[化学工程—合成树脂塑料工业]