基于单轴拉伸试验机的双轴拉伸夹具设计与应用  

Design and Application of Biaxial Tensile Fixture Based on Uniaxial Tensile Testing Machine

作　　者：周龙早 刘杰 刘辉[1] ZHOU Longzao;LIU Jie;LIU Hui(School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学材料科学与工程学院

出　　处：《实验科学与技术》2020年第1期1-5,11,共6页Experiment Science and Technology

基　　金：华中科技大学教学研究项目(2015010)

摘　　要：该文针对单轴拉伸试验机不能实现双轴拉伸试验的问题,设计了一种能够将单轴拉伸运动精准地转换成为双轴拉伸运动的双轴拉伸夹具。首先介绍了双轴拉伸夹具的基本原理和运动机构;然后以细菌纤维素水凝胶十字拉伸试样进行双轴拉伸试验,通过对水平和垂直方向拉伸位移的比较,来对双轴拉伸运动的精度和可靠度进行验证。结果表明:双轴拉伸垂直位移Y与水平位移X的线性回归关系为Y=0.9998X+0.002,样本判定系数R^2=1;水平位移和垂直位移在0~10s内的标准差基本在千分之一的水平。试验结果有力地证明了双轴拉伸夹具具有较高的精度和可靠度,能够较精确地将单轴拉伸力转换成为双轴拉伸力,从而成功实现基于单轴拉伸试验机的双轴十字拉伸实验。Aiming at the problem that the uniaxial tensile testing machine cannot achieve the biaxial tensile test,a biaxial tensile fixture capable of accurately converting the uniaxial tensile motion into the biaxial tensile motion is designed.First,the basic principle and motion mechanism of the biaxial stretching jig is introduced;then,a biaxial tensile test is performed with a bacterial cellulose hydrogel cross tensile sample,and the comparison of the horizontal and vertical tensile displacement is performed to complete verification of the accuracy and reliability of biaxial stretching movements.The results show that the linear regression relationship between the vertical displacement Y and the horizontal displacement X is Y=0.9998X+0.002,the determinants of coefficient R^2=1.The standard tolerances between the horizontal displacement and the vertical displacement within 0 to 10 seconds are almost in the level of one in a thousand.The test results suggest that the biaxial tensile fixture could transform a uniaxial tensile motion into a biaxial one.It can successfully realize the biaxial cruciform tensile test based on the uniaxial tensile testing machine.

关 键 词：单轴拉伸试验机 双轴拉伸夹具 双轴拉伸试验 力学测试 

分 类 号：TB302.3[一般工业技术—材料科学与工程]