10-1纯弯曲时梁的正应力 10-2正应力公式的推广强度条件 10-3提高梁强度的主要措施

5-1、材料力学简史

13-1基本概念 13-2细长压杆的临界力 13-3压杆的临界应力 13-4压杆的稳定校核 13-5稳定系数法 13-6提高压杆稳定性的措施

超静定结构是具有多余约束的几何不变体系,仅 由静力平衡条件不能完全求出它的反力和内力

12-1概述 12-2斜弯曲 12-3拉(压)弯组合变形

7-1连接件的强度计算 1.剪切的工程实例

3-1力对点之矩 3-2力偶·力偶矩 3-3平面力偶系的合成与平衡条件

1-1静力学的基本概念 1-2静力学公理

1 Introduction Background for New methodology Modern natural science methodology is mainly based on matter and energy Even though matter and energy are still necessitate factors in information system, yet the characteristic feature of information systems, particularly the complex ones, is neither matter nor energy but information Without information, the complex information systems, like brain and intelligent life. cannot be understood

1.1 System Fundamentals Definitions System: Definitions System- integrity of elements that form a certain structure internally and perform certain functions externally. L von Bertalanffy: System --set of interrelated elements