压杆稳定问题的差分法

Calculation for stability of compressive rod

用差分法导出两端铰支压杆临界力计算公式，并提出一个求解压杆失稳时挠曲线的迭代公式．同时找出该公式同传统的两端铰支压杆临界力计算公式的关系，并进一步对该公式的结果进行了分析．

This papers a formula to calculate critical load of compressive rod pinned at two ends is provided, and a new iterative formula is given to get the curve of rod when the rod lost it's stability straoght line equilibrium position. At the some time, the relationships between the formula and the traditional formula of compressive rod pinned at two ends are given. Frothermore it makes analysis of the formula.