摘要基于梁的弯曲理论推导了楔块叠合梁的正应力公式，得到了叠合梁截面上不 同高度上点的正应力分布规律，设计了电测法试验方案，在叠合梁上粘贴应变片。 完成了对两种楔块叠合梁组合的剪切弯曲应力的电测法试验，得出了如下结论：

（1）楔块叠合梁的中性轴所在位置和两种材料的弹性模量有关系。（2）当两个 梁的材料相同时它们的应力应变规律和整体一个梁基本上是一致的。（3）如果 两个梁的材料不同，应力在接合处会有突变。（4）将实验值与理论值比较，两 者大致一致。（5）如果出现了一些偏差也是试验过程和应变片的粘贴中出现了 一些误差，其中，主要的影响因素还是对于应变片的选择和对其进行粘贴。72672

该论文有图 34 幅，表 4 个，参考文献 32 篇

[毕业论文关键词]：叠合梁 剪切弯曲 电测法试验 应力计算 应变片粘贴

Experimental research on shear stress measuring method bending composite beams hit the wedge

Abstract Through a combination of the two wedges composite beam bending shear stress measuring method test, the following conclusions: usually seen wedge composite beams are rigid constraints, and this time the beam, they where the neutral position of the shaft and the elastic modulus of the two materials are。When the two beams of the same material stress-strain laws and their overall listing of a beam substantially the same, if the two beams of different materials, there will be different, there will be stress at the junction mutation, and the strain of the basic law, or Changeless。The calculated theoretical value from our values and doing pre-test measurements are compared, is basically the same, also proved the theoretical formula derived is correct, if there is some deviation and paste the testing process in the emergence of strain gages some errors, especially in the choice of the strain gauge and pasting accuracy of the test results greater impact。

Key Words:Composite beam Electrical measuring method experiment bending Stress calculation Paste gage

目录

摘要 I

Abstract II

目录 III

1 绪论 1

1。1 研究意义 1

1。2 研究现状 2

1。3 研究方法和技术路线 6

2 楔块叠合梁剪切弯曲应力 7

2。1 完全刚性楔块叠合梁理论分析 7

2。2 理论公式推导 8

3 电阻应变测量技术原理及方法 11

3。1 概述 11

3。2 电阻应变片的工作原理 12

3。3 电阻应变片的具体构造及其特性 13

3。4 电阻应变片的分类 15

3。5 电阻应变片的选择、安装和防护 17

4 楔块叠合梁剪切弯曲正应力电测法 37

4。1 实验目的 37

4。2 实验原理和装置 37

4。3 试验软件介绍 39