能量滤 (Energy Method) 四、功能原理( Work-energy principle) 可变形固体在受外力作用而变形时,外力和内力均将作功对 于弹性体,不考虑其他能量的损失外力在相应位移上作的功在数 值上就等于积蓄在物体内的应变能 The formula V=N ( Work-Energy Principle We will not consider other forms of energy such as thermal energy, chemical energy, and electromagnetic energy. Therefore, if the stresses in a body do not exceed the elastic limit, all of work done on a body by external forces is stored in the body as elastic strain energy共1页 4 (Energy Method) 可变形固体在受外力作用而变形时,外力和内力均将作功. 对 于弹性体,不考虑其他能量的损失,外力在相应位移上作的功,在数 值上就等于积蓄在物体内的应变能. Vε = W 四、功能原理（Work-energy principle） The formula: （Work-Energy Principle） We will not consider other forms of energy such as thermal energy, chemical energy, and electromagnetic energy. Therefore, if the stresses in a body do not exceed the elastic limit, all of work done on a body by external forces is stored in the body as elastic strain energy