偏心拉杆极值应力的电测法研究  

Electrometric method experiment study on extremum stress of eccentric tensile links

作　　者：蔡瑜玮[1] 李顺才[1] 吴明明[1] 

机构地区：[1]江苏师范大学机电学院,江苏徐州221116

出　　处：《江苏师范大学学报（自然科学版）》2014年第3期50-53,共4页Journal of Jiangsu Normal University：Natural Science Edition

基　　金：江苏省"青蓝工程"基金资助项目(10QLD006);江苏省"333工程"人才资助项目

摘　　要：基于组合变形理论推导了偏心拉杆危险点的拉、压应力计算公式;利用静态电阻应变仪及材料力学多功能台,采用半桥单臂惠斯通电桥测得了杆件材料的杨氏弹性模量及偏心拉杆的危险点应力;采用半桥双臂及全桥对臂法分别测得了轴向力及弯矩单独作用下的拉应变,并由胡克定律得到了偏心拉伸截面上的最大拉应力及压应力.研究表明,通过电测法所得危险点应力与理论值非常吻合,研究结果证实了方法的可行性.The formula of calculating tensile and compressive stress of dangerous point on eccentric tensile links is derived based on composite deformation theory.Young's elastic modulus and the stress at the dangerous point are measured by a material mechanics multi-function test-bed and a static resistance strain instrument and by the half bridge-single arm of Wheatstone bridge.The tensile strain under the independent effect of axial force and bending moment is measured respectively by the half bridge-dual arm and full bridge-opposite arm method,then maximum tensile and compressive stress on the section of the tensile eccentric links are obtained by Hooke law.The results show that the stress of the dangerous point by electrometric-method experiment is approximately equal to the theo-retical solution and the research results prove that the experiment method is reliable.

关 键 词：偏心拉伸 极值应力 电测法 惠斯通电桥 

分 类 号：O348.2[理学—固体力学]