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压杆在临界力作用下会由稳定平衡状态转变到不稳定平衡状态,即材料力学教材中提到的的压杆失稳。对于压杆失稳后其挠曲线的形态是各不相同的,影响挠曲线形态变化的因素有轴向荷载、压杆两端约束条件以及挠曲线方程中的自然数n等,随着这些因素的变化,压杆失稳时的挠曲线也将会出现不同的形态。于是我们来浅谈一下临界力作用下的细长压杆在失稳时的挠曲线形态随杆端约束条件以及n的的变化而变化的规律。
Under the action of critical force, the pressure rod will change from a stable equilibrium state to an unstable equilibrium state, that is, the pressure rod instability mentioned in the textbook of material mechanics. For the buckling of the buckling after the shape of the bend is different from the deflection of the shape of the factors that affect the axial load, the constraints at both ends of the bar and the flexural equation of the natural number n and so on, with these factors Variations, deflection curves when the strut will also appear in different forms. So we come to talk about the critical force under the action of the elongated flexible rod in the instability of the deflection curve with the rod-side constraints and n changes in the law.