With upper bound method and leastenergyprinciple, the conditions are established of drawing and breaking workpiece with cross wedge rolling technique to form axial symmetry spare parts.
利用上限原理和最小能量原理，获得了用楔横轧工艺成形阶梯轴类件时杆部拉断的条件。
2
Some end value condition derived by variational method in accordance with the leastenergy loss principle and their mechanical background are also dealt with.
同时从能量最小原理出发，用变分的方法推导出几种端值条件，说明它们的力学背景。
3
Application of leastenergy consumption principle in structural analysis is dis - cussed in this paper.