基于纳米压痕的线性黏弹材料泊松比的测试方法  

Measurement of Poisson’s Ratio of Linear Viscoelastic Materials by Nano-indentation

作　　者：周沙溆[1,2] 胡宏玖[1] 李洁[3] 贺耀龙[1] 李达开[1] 

机构地区：[1]上海大学上海市应用数学和力学研究所,上海200072 [2]吉首大学张家界学院,湖南张家界427000 [3]上海大学分析测试中心,上海200444

出　　处：《润滑与密封》2010年第1期37-40,44,共5页Lubrication Engineering

基　　金：国家自然科学基金资助项目(10672095)

摘　　要：将Berkovich压针纳米压痕蠕变和单轴拉伸蠕变试验相结合,提出了一种适合于线性黏弹材料泊松比的测试方法,并采用恒定荷载与恒加载速率2种加载模式测试了聚碳酸酯的泊松比。结果表明:在纳米压痕试验的时间尺度内,线性黏弹材料的泊松比可视为不变,其测量值与电阻应变法的试验结果基本一致,二者相差小于7%,其中恒加载速率压痕蠕变的试验结果更为稳定。Combining dynamic nano-indentation using Berkovich tip with tensile creep testing, a new method to measure Poisson＇ s ratio of linear viscoelastic materials was suggested, and the method was used to measure the Poisson＇ s ratio of polycarbonate with nano-indentation at a constant indentation loading rate and constant amplitude loading indentation. The results show that Poisson＇ s ratio can be regarded as constant within the time scale of nano-indentation, the testing value obtained by the presented method is close to the experimental results using electric resistance strain gage, and the average percent error of Poisson＇ s ratio is less than 7%. The Poisson＇ s ratio data measured with nano-indentation at a constant in- dentation loading rate is much more accurate than those at constant amplitude loading indentation.

关 键 词：泊松比 线黏弹性 纳米压痕 蠕变 

分 类 号：TB42[一般工业技术]