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目前待矫直板材缺陷类型及程度的判断仍然是依赖现场工作人员的经验,具有很大的不确定性。为了获得待矫直板材残余应变(应力)的大小及分布,根据薄板大挠度屈曲理论和最小势能原理,建立了基于浪形几何参数的反解计算模型。通过实测的浪形几何参数和预设挠曲函数,对引起边浪、中浪(肋浪)等典型的浪形缺陷的残余应变(应力)进行求解,并与实测值进行对比。结果表明,残余应变(应力)的分布与浪形几何形状相对应,但压应力宽度略小于屈曲宽度,即紧邻压应力的拉应力区也产生了挠曲;几何非线性及后屈曲强度对浪形状态的影响是显著的;求解过程与板厚无关,所需几何参数较少,便于现场应用。
Currently to be straightened plate defect type and degree of judgment is still dependent on the experience of field staff, with great uncertainty. In order to obtain the size and distribution of the residual strain (stress) of the plate to be straightened, an inverse solution calculation model based on the geometric parameters of the corrugated plate is established according to the principle of large deflection buckling and the principle of minimum potential energy. Residual strain (stress) caused by typical wave-shaped defects such as side waves and mid-waves (rib waves) is solved by the measured wave geometry parameters and the preset deflection function, and compared with the measured values. The results show that the distribution of residual strain (strain) corresponds to the wave geometry, but the width of compressive stress is slightly less than the buckling width, that is, the tensile stress zone adjacent to compressive stress also produces flexural deformation. Geometrical nonlinearity and posterior buckling strength The influence of shape state is remarkable. The solving process has nothing to do with the thickness of the slab, the geometric parameters needed are less, and it is easy to apply on site.