作　　者： ; ; ; ; ; ;

机构地区： 华南理工大学土木与交通学院

出　　处： 《哈尔滨工程大学学报》 2013年第8期1000-1005,共6页

摘　　要： 为探讨泡沫铝在静态压缩时的温度效应，开展了-50℃～300℃范围内不同温度下的泡沫铝静态压缩实验，分析了泡沫铝在不同温度下的力学性能，测得不同温度下泡沫铝的单轴压缩应力应变关系。通过分析Liu和Subhash的六参数本构模型的特点，提出将其简化为五参数模型。并应用五参数模型对不同温度下的实验数据拟合，拟合效果很好。分析和确定了模型中五参数随温度变化的函数，并代入五参数模型，从而建立了考虑温度效应的泡沫铝静态压缩本构模型。对该理论模型进行外推，可以得到更高温度下的泡沫铝应力应变关系，揭示随着温度升高，泡沫铝屈服后依次存在“无密实”、“完全流动”和“软化”等不同的状态。 To investigate the temperature effect of aluminum foam under compression in a static state, compressive experiments of aluminum foam under the temperature ranging from -50℃ to 300℃ were carried out. The mechani-cal behaviors of aluminum foam under different temperatures were analyzed, and the uniaxial stress-strain relation-ships of aluminum foam were measured. Based on the analysis of Liu and Subhash's six-parameter constitutive mod-el, a simplified five-parameter model was proposed. The five-parameter model was used to fit the experimental data at different temperatures, and the fitting results meet the experimental data well. The functions between the revised five parameters and changing temperature were analyzed and determined, and a constitutive model of aluminum foam with temperature effect was established. A further study on extrapolation of the theoretical model is investiga-ted, and the stress-strain relations of aluminum foam at higher temperatures can be obtained. The results show that the aluminum foam experiences three different states of 'none compaction','full flow' and 'softening' after the yield with the increment of temperature gradually.

关 键 词： 泡沫铝 温度效应 静态压缩 本构模型

领　　域： [理学] [理学]