Mechanics of materials CHAPTERI3 IDYNAMI CLOADS
1 Mechanics of Materials
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CHAPTER 13 DYNAMIC LOADS □§13-1 BASIC CONCEPTS □§13-2 DYNAMIC RESPONSE ABOUT THE PROBLEM OF ACCELERATIVE MOTIONS 习§13-3 DYNAMIC RESPONSE ABOUT THE PROBLEM OF IMPACT LOADS
CHAPTER 13 DYNAMIC LOADS §13–1 BASIC CONCEPTS §13–2 DYNAMIC RESPONSE ABOUT THE PROBLEM OF ACCELERATIVE MOTIONS §13–3 DYNAMIC RESPONSE ABOUT THE PROBLEM OF IMPACT LOADS
第十三章动荷载 §13-1基本概念 §13-2加速运动问题的动响应 §13-3冲击荷载问题的动响应
第十三章 动荷载 §13–1 基本概念 §13–2 加速运动问题的动响应 §13–3 冲击荷载问题的动响应
DYNAMIC LOAD §13-1 BASIC CONCEPTS 1、 Dynamic loa The loads don t change with time(or change very stably and slowly )and acceleration of each member is zero or may be neglected, this kind of the loads are called static loads. The loads change sharply w ith time and the velocity of the member changes obviously the member produces the inertia force ) this kind of load is loads are called dynamic loads 2、 Dynamic responses: Various responses (such as stress, strain, displacement and so on )ofthe member under the action of dynamic loads are called dynamic responses. Experiment prove that Hooke law applied validly under static loads may be applied to the case of dynamic loads with Estat ic=edvnamic as long as the stress does not exceed the proportional limit
1、Dynamic loads： §13-1 BASIC CONCEPTS 2、Dynamic responses： The loads don’t change with time(or change very stably and slowly) and acceleration of each member is zero or may be neglected ，this kind of the loads are called static loads. The loads change sharply with time and the velocity of the member changes obviously（the member produces the inertia force），this kind of load is loads are called dynamic loads. Various responses (such as stress、strain、displacement and so on)of the member under the action of dynamic loads are called dynamic responses. Experiment prove that Hooke’law applied validly under static loads may be applied to the case of dynamic loads with Estatic=Edynamic as long as the stress does not exceed the proportional limit