Abstract To instruct optimal design of sandwich panel with cutout, stress/strain concentration factor (SCF) and failure envelope of composite lattice-core sandwich panel (LSP) with circular cutout under multi-axial in-plane loads were investigated by numerical simulations and verified by digital image correlation (DIC) technique. SCF of the laminated composite skin is much higher than the orthotropic lattice core. Under different loading cases, skin layers with different orientations have different SCFs. SCF is also sensitive to the relation between the cutout diameter and the lattice cell dimension. Intersection of the lattices always produces a local peak value of SCF. Lower SCF can be designed by optimizing the diameter and location of the cutout. Strengthening effects of the strengthening range and strengthening material were discussed to reduce the SCF of the LSP.

中文翻译：

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面内加载格芯夹芯板的开孔效果

摘要 为了指导带切口夹芯板的优化设计，通过数值模拟研究了多轴面内载荷作用下圆形切口复合晶格芯夹芯板（LSP）的应力/应变集中系数（SCF）和破坏包络线，并进行了验证。通过数字图像相关（DIC）技术。层压复合蒙皮的 SCF 远高于正交各向异性晶格核。在不同的载荷情况下，不同方向的表层具有不同的 SCF。SCF 对切口直径和晶格单元尺寸之间的关系也很敏感。晶格的相交总是产生 SCF 的局部峰值。可以通过优化切口的直径和位置来设计更低的 SCF。