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本文在文献[3]的基础上,应用力——位移图,较直接明瞭地证明弹性体在一般荷载作用下,对于任意选择的可能位移场和可能应力场,分别有最小势能原理和最小余能原理成立,从而使读者对这两个能量原理有一个几何图形的概念。
Based on the literature [3], the force-displacement diagram is more straightforwardly proved that the elastic body has the minimum potential energy principle and the minimum possible residual stress field for any possible displacement field and potential stress field under normal load. The principle can be established, so that readers have a geometric concept of these two energy principles.