首先应用小挠度弹性理论，在一些合理简化假设的基础上，推导自平衡索桁架的初始刚度、松弛刚度及临界松弛荷载公式。
Based on the small-deflection elastic theory and some simplified assumptions, the initial stiffness, the slack stiffness and the critical slack load have been derived theoretically.
采用双扭试件常位移松弛法，对金川软弱复杂矿岩进行亚临界裂纹扩展试验研究。
The constant-displacement-relax method of double torsion specimens was applied to(study) subcritical crack growth of flabby and intricate ore in Jinchuan mine.
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