摘要本文通过对现有的关于叠合梁的大量文献以及论文的整理归纳，详细介绍了叠合梁的研究现状以及研究意义，通过对相关文献的查阅与对相关知识的学习，在现有理论公式的基础上分别推导出了同材料自由叠合梁的纯弯曲应力公式以及不同材料的自由叠合梁的纯弯曲应力公式。为了验证这一公式，选择力尔试验机作为试验器材，采用电测法的试验方法，制定了详细的试验方案，在叠合梁的合适位置粘贴应变片，并通过惠更斯电桥的连接方式将应变片接入力尔试验机，完成了同材料自由叠合梁的纯弯曲应力试验，实现了构件应变信息到电信号的转换，得到了不同高度处同材料自由叠合梁的应力应变试验值。在测出试验值后，将试验值与计算得到的理论值值进行比较，研究表明试验值与理论值的规律基本一致。74040

【毕业论文关键词】 叠合梁，纯弯曲，电测法，应变片

Experimental study on pure bending stress of composite beams with the same material and different materials

Abstract [] in this paper, through to existing on iterated combined beam of a large number of documents and the finishing induction, details of the composite girder's research situation and the significance of the research through the literature review and the relevant knowledge of learning, on the basis of the existing theoretical formula were deduced with free material stack combined beams of pure bending force formula and free of different materials stacked together pure bending of beam should force formula。 In order to verify the formula, in after careful consideration we choose lifein testing machine as a test equipment, electrometric method test method uses, formulated the detailed test plan, laminated beam at the appropriate position of the strain gage in the and by Huygens bridge connection will be variable fin access lifein testing machine, completed the material with free laminated beams of pure bending test force, realizes conversion component strain information into electrical signals has been at different heights with free material stack combined beam, the stress and strain of the experimental values。 After the test values are measured, the test values are compared with the experimental values obtained from the calculation, and the conclusion is obtained that the theoretical value of this paper can be used。

[Key words] composite beam, pure bending, electric measurement strain gauge, 

目    录

摘要。。Ⅲ

Abstract。。。Ⅳ

第1章 绪论 1

1。1 研究背景与研究意义 1

1。2研究现状 1

1。3研究方法及技术路线 5

第2章 叠合梁的纯弯曲正应力公式 6

2。1 模型分析 6

2。2单梁的纯弯曲应力 7

2。3自由叠合梁的纯弯曲应力 9

第3章 电测法技术基础 12

3。1 电测法原理 12

3。2电阻应变片 13

3。3 电桥特性 17

3。5温度补偿 19

3。6应变片在电桥中的接线方法 20

第4章 叠合梁纯弯曲正应力电测法试验 22

4。1 拉扭试验机简介 22

4。2 力尔试验系统简介 23