含初始挠度加筋板的稳定性分析

为了确定初始挠度变形对加筋板稳定性的影响作用,根据实际情况假设初始挠度为双三角级数形式,利用Ansys计算分析了整体初始挠度的幅值与半波数对弹性失稳压力的影响,并得到初始挠度对加筋板稳定性的影响因子计算方法.计算结果分析表明,随着初始挠度的幅值和半波数的增加,加筋板弹性失稳压力逐渐减小;对于含有某种初始挠度的加筋板,其影响因子主要受加筋板的厚度和加强筋间距的影响,而加筋板长宽比的影响较小,可以忽略.

The buckling analysis of the stiffened plate with initial deflection

For the research,the mode of the initial deflection was regarded as the double trigonometric series based on the practical truth and the effect of the amplitude and the number of half-waves on the critical stress entirely was analyzed by computing with ANSYS.The impact factor of the initial deflection was obtained.Results indicate that with the increasing of amplitude and the number of half-waves,the critical stress decreases.For the stiffened plate with one kind of initial deflection,the impact factor is up to the thickness of the stiffened plate and the space between stiffeners.The length-width ratio has little influence on the impact factor and it can be ignored.