论文部分内容阅读
采用预埋缺陷的方法,制备含有面芯脱焊缺陷的高温合金蜂窝板,进行了三点弯曲试验,研究了缺陷形状、大小、位置和蜂窝芯取向对蜂窝板三点弯曲损伤模式和承载能力的影响。研究发现,含面芯脱焊缺陷的蜂窝板在缺陷受压部位产生反向鼓包,并沿着宽度方向扩展为完全破坏;随着缺陷尺寸的增大,蜂窝板承载能力逐渐降低;当缺陷位于三点弯曲受拉面时,蜂窝板具有更高的三点弯曲极限载荷,且矩形缺陷试样的弯曲极限载荷要高于相同缺陷面积的圆形试样。最后,利用LS-DYNA对含圆形缺陷高温合金蜂窝板的三点弯曲性能进行了数值模拟分析,得到其三点弯曲过程中的应力分布状态。
A three-point bending test was conducted on the superalloy honeycomb panels with the defects of surface core de-bonding. The three-point bending damage modes and carrying capacity of the honeycomb panel were investigated. The defect shape, size, location and orientation of the honeycomb core were studied. Impact. It was found that the honeycomb panels with face-core de-bonding defects produced reverse bulging in the flawed parts and expanded completely along the width direction. With the size of the defects increasing, the carrying capacity of honeycomb panels decreased gradually. The honeycomb panels had higher three-point bending ultimate load at three-point bending, and the bending ultimate load of rectangular defect specimens was higher than that of the circular specimens with the same defect area. Finally, LS-DYNA was used to simulate the three-point bending behavior of honeycomb panels with circular defects. The stress distribution during three-point bending process was obtained.