《材料力学》课程PPT教学课件（双语版）第一章 轴向拉和压缩

Mechanics of materials CHAPTERI AXIALTEI SIONAND COMPRESSION

Mechanics of Materials 1

树料力 ALA 上且A 2

2

CHAPTER 1 AXIAL TENSION AND COMPRESSION D s1-1 Concepts and practical examples of axial tension and compression □]§1-2 Internal force、 method of section、 axial force and its diagram D 81-3 Stresses on the section and strength conditions 81-4 Deformation of the rod in axial tension and compression law of elasticity D$1-5 Elastic strain energy of the rod in axial tension and compression 81-6 Statically indeterminate problems and their treatment methods of axial tension and compression $ 1-7 Mechanical properties of materials in axial tension and compression

CHAPTER 1 AXIAL TENSION AND COMPRESSION §1–1 Concepts and practical examples of axial tension and compression §1–2 Internal force、method of section、axial force and its diagram §1–3 Stresses on the section and strength conditions §1-4 Deformation of the rod in axial tension and compression  law of elasticity §1-5 Elastic strain energy of the rod in axial tension and compression §1-6 Statically indeterminate problems and their treatment methods of axial tension and compression §1-7 Mechanical properties of materials in axial tension and compression 3

第一章轴向拉伸和压缩 §1-1轴向拉压的概念及实例 §1-2内力、截面法、轴力及轴力图 □§1-3截面上的应力及强度条件 §1-4拉压杆的变形.弹性定律 」§1-5拉压杆的弹性应变能 回§1-6拉压超静定问题及其处理方法 §1-7材料在拉伸和压缩时的力学性能

4 §1–1 轴向拉压的概念及实例 §1–2 内力、截面法、轴力及轴力图 §1–3 截面上的应力及强度条件 第一章 轴向拉伸和压缩 §1-4 拉压杆的变形  弹性定律 §1-5 拉压杆的弹性应变能 §1-6 拉压超静定问题及其处理方法 §1-7 材料在拉伸和压缩时的力学性能

AXIAL TENSIONAND COMPRESSION 81-1 CONCEPTS AND PRACTICAL EXAMPLES OF AXIAL TENSION AND COMPRESSION l、 Concepts Characteristic of the external force: The acting line of the resultant of external forces is coincided with the axis of the rod Characteristic of the deformation: Deformation of the rod is mainly elongation or contraction along the axis of the rod and companied with lateral reduction or enlargement Axial tension Deformation of the rod is axial elongation and lateral shortening. Axial compression: Deformation of the rod is axial shortening and lateral enlargement

§1–1 CONCEPTS AND PRACTICAL EXAMPLES OF AXIAL TENSION AND COMPRESSION Characteristic of the external force：The acting line of the resultant of e x t e r n a l fo r c e s i s co i n c i d ed w i t h t h e a x i s o f t h e ro d . 1、Concepts Characteristic of the deformation：Deformation of the rod is mainly elongation or contraction along the axis of the rod and companied with lateral reduction or enlargement. Axial tension ：Deformation of the rod is axial elongation and lateral shortening. Axial compression：Deformation of the rod is axial shortening and lateral enlargement. 5

§1-1轴向拉压的概念及实例 概念 轴向拉压的外力特点:外力的合力作用线与杆的轴线重合。 轴向拉压的变形特点:杆的变形主要是轴向伸缩,伴随横向 缩扩。 轴向拉伸:杆的变形是轴向伸长,横向缩短。 轴向压缩:杆的变形是轴向缩短,横向变粗

6 §1–1 轴向拉压的概念及实例 轴向拉压的外力特点：外力的合力作用线与杆的轴线重合。 一、概念 轴向拉压的变形特点：杆的变形主要是轴向伸缩，伴随横向 缩扩。 轴向拉伸：杆的变形是轴向伸长，横向缩短。 轴向压缩：杆的变形是轴向缩短，横向变粗

AXAL TENSIONAND COMPRESSION Mechanical models are shown in the figures P P In axial tension, the corresponding force is called tensile rce P—E P In axial compression, the corresponding force is called compressive force

In axial compression，the corresponding force is called compressive force. In axial tension，the corresponding force is called tensile force. Mechanical models are shown in the figures P P P P 7

力学模型如图 P P 轴向拉伸,对应的力称为拉力。 P 轴向压缩,对应的力称为压力

8 轴向压缩，对应的力称为压力。 轴向拉伸，对应的力称为拉力。 力学模型如图 P P P P

AXAL TENSIONAND COMPRESSION 2 区区区区还 Practical examples In engineering

Practical examples in engineering 2、 9

区区区区还 工程实例 10

10 工程实例 二