高温环境下材料泊松比测试方法研究  

Material Poisson’s Ratio Measurement Method at Elevated Temperatures

作　　者：余建新[1] 王晓鹏[1] 崔喜平[1] YU Jianxin;WANG Xiaopeng;CUI Xiping(Center of Analysis,Measurement and Computing,Harbin Institute of Technology,Harbin 150080,China)

机构地区：[1]哈尔滨工业大学分析测试与计算中心,哈尔滨150080

出　　处：《实验科学与技术》2022年第1期28-33,共6页Experiment Science and Technology

基　　金：国家自然科学基金(51771064,51971074)。

摘　　要：对高温环境下材料泊松比测试的共振法进行了研究,提出一种矩形样品的陶瓷杆三点支撑方法,结合弯曲模态振型节点和剪切模态振型节点确定样品支撑位置,采用脉冲激励技术同步测量弹性模量、剪切模量、泊松比、阻尼因子等材料参数,给出了高温下泊松比测试流程,讨论了试验相关注意事项。以碳化硅颗粒增强铝合金为例,获得了泊松比随温度变化曲线。结果表明,随着温度升高,泊松比微小幅度增加。该方法可用于金属、陶瓷、钛合金等其他固体材料在高温环境下的泊松比测试。Resonance method of the material Poisson’s ratio measurement at elevated temperature is investigated. A method for supporting rectangular sample based on three ceramic rods is proposed, the supporting positions are determined based on the modal nodes of both bending and shearing mode shapes, material parameters such as elastic modulus, shear modulus, Poisson’s ratio and damping factor are tested by impulse excitation technology, the flowchart for Poisson’s ratio measurement at elevated temperature is illustrated, and related issues are discussed. A SiC grain reinforced Aluminum alloy is taken as an example, the relationship between Poisson’ s ratio and temperature is obtained. Results show that Poisson’ s ratio slightly increased as temperature increased. The discussed Poisson’s ratio measurement method is feasible for the measurement of other solid materials, such as metals, ceramics and titanium, at elevated temperatures.

关 键 词：弹性模量 剪切模量 泊松比 脉冲激励技术 高温环境 

分 类 号：TP302.1[自动化与计算机技术—计算机系统结构]