《材料力学》课程PPT教学课件（双语版）第四章 弯曲内力

Mechanics of materials CHAPTERA INE⊥ LFORCES INBENDING

1 Mechanics of Materials

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CHAPTER 4 INTERNAL FORCES IN BENDING 84-1 Concepts of planar bending and calculation sketch of the beam 84-2 The shearing force and bending moment of the beam s 84-3 The shearing-force and bending-moment equations the shearing force and bending-moment diagrams > 84-4 Relations among the shearing force the bending moment and the density of the distributed load and their applications >s4-5 Plot the bending-moment diagram by the theorem of superposition >84-6 The internal-force diagrams of the planarrigid theorem frame and curved rods D Exercise lessons about the internal force of bending

3 §4–1 Concepts of planar bending and calculation sketch of the beam §4–2 The shearing force and bending moment of the beam §4–3 The shearing-force and bending-moment equations · the shearing￾force and bending-moment diagrams §4–4 Relations among the shearing force、the bending moment and the density of the distributed load and their applications §4–5 Plot the bending-moment diagram by the theorem of superpositiom §4–6 The internal-force diagrams of the planar rigid theorem frames and curved rods Exercise lessons about the internal force of bending CHAPTER 4 INTERNAL FORCES IN BENDING

第四章弯曲内力 §4-1平面弯曲的概念及梁的计算简图 §42梁的剪力和弯矩 §4-3剪力方程和弯矩方程剪力图和弯矩图 §44剪力、弯矩与分布荷载集度间的关系及应用 □§4-5按叠加原理作弯矩图 §46平面刚架和曲杆的内力图 弯曲内力习题课

4 §4–1 平面弯曲的概念及梁的计算简图 §4–2 梁的剪力和弯矩 §4–3 剪力方程和弯矩方程 ·剪力图和弯矩图 §4–4 剪力、弯矩与分布荷载集度间的关系及应用 §4–5 按叠加原理作弯矩图 §4–6 平面刚架和曲杆的内力图 弯曲内力习题课 第四章 弯曲内力

INTERNAL FORCESIN BENDING 84-1 CONCEPTS OF PLANAR BENDING AND CALCULATION SKETCH OF THE BEAM 1、 CONCEPTS OF BENDING 1). BENDING: The action of the external force or external the couple vector perpendicular to the axis of the rod makes the axis of the rod change into curve from original straight lines, this deformation is called bending. M M 2) BEAM: The member of which the deformation is mainly bending is generally called beam

5 §4–1 CONCEPTS OF PLANAR BENDING AND CALCULATION SKETCH OF THE BEAM 1、CONCEPTS OF BENDING 1). BENDING: The action of the external force or external the couple vector perpendicular to the axis of the rod makes the axis of the rod change into curve from original straight lines, this deformation is called bending. 2).BEAM：The member of which the deformation is mainly bending is generally called beam

意曲内为 §4-1平面弯曲的概念及梁的计算简图 一、弯曲的概念 1.弯曲:杆受垂直于轴线的外力或外力偶矩矢的作用时,轴 线变成了曲线,这种变形称为弯曲。 M M 2.梁:以弯曲变形为主的 构件通常称为梁

6 §4–1 平面弯曲的概念及梁的计算简图 一、弯曲的概念 1. 弯曲: 杆受垂直于轴线的外力或外力偶矩矢的作用时,轴 线变成了曲线，这种变形称为弯曲。 2. 梁：以弯曲变形为主的 构件通常称为梁

INTERNAL FORCESIN BENDING 3). Practical examples in engineering about bending 桥式吊梁在自重及 重量作用下发生弯曲变形

7 3).Practical examples in engineering about bending

意曲向为 3.工程实例 桥式吊梁在自重及 重量作用下发生弯曲变形

8 3. 工程实例

INTERNAL FORCESINBENDING

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