论文部分内容阅读
针对以往研究只考虑充气内压的预应力效应,且存在褶皱判据定义不科学的问题,该文依据薄膜材料褶皱的基本理论,采用“最小主应力为零”作为薄膜褶皱判据,以承受端部集中载荷而弯曲的充气悬臂梁为研究对象,基于Euler-Bernoulli梁模型,加入了压力追随效应修正,推导了充气悬臂梁挠度计算的基本方程,并给出了可行的求解方法及计算程序。搭建了充气悬臂梁非线性挠曲变形行为的实验平台,设计了力控制与位移控制相结合的加载方式,并采用非接触式的位移测量方式,进行了充气悬臂梁的弯曲挠度实验研究,分析了充气内压对充气悬臂结构承弯能力和弯曲刚度的影响。理论计算和实验结果的对比分析表明进行充气悬臂梁的弯曲挠度计算时,压力追随效应的贡献非常重要而不可忽视。
In view of the fact that the prestressing effect of inflatable internal pressure is only considered in the previous studies, and there is an unscientific problem of the definition of wrinkle criterion, based on the basic theory of film material wrinkle, the criterion of “minimum principal stress is zero” Based on the Euler-Bernoulli beam model, the pressure follow-up correction was added to the inflatable cantilever beams that were subjected to the concentrated bending loads at the ends. The basic equations for calculating the deflection of the inflatable cantilever beams were deduced. Calculation procedures. The experimental platform of the nonlinear bending deformation behavior of the inflatable cantilever was established. The loading method combining the force control and the displacement control was designed. The bending deflection experiment of the inflatable cantilever was carried out by using the non-contact displacement measurement method. Effect of Inflatable Internal Pressure on Bending Capacity and Bending Stiffness of Inflatable Cantilever Structure. The comparison of theoretical calculation and experimental results shows that the contribution of pressure follow-up effect is very important and can not be neglected in the calculation of bending deflection of inflatable cantilever beam.