介绍了一种关于材料力学中轴力、扭矩、剪力及弯矩等内力图的规律画法,建立了内力的增减与外力方向间的关系,并对利用该规律法绘制内力图进行了实例说明,以达到准确、快速的绘制内力图.%This article introduced a kind of law method of internal force diagram on the torque, axial force, shear force and bending moment in mechanical of materials, established the relationship between the change of internal force and the direction of the external force, and gave an example to illustrate the internal force diagram by using this method,in order to achieve accurate and quick draw internal force diagram.
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