Composite sandwich materials provide high bending performance-to-weight ratios. However, these materials are vulnerable to impact damages which can drastically reduce their load-bearing capability. Presently there is a lack of standardised test methods for impact assessment. This study compares three different test methods for impact assessment; single skin compression after impact (CAI-SS), sandwich compression after impact (CAI-SW) and four-point bending-after-impact (BAI). The CAI-SS test method shows high compressive strength and strain at failure and the tesr is relatively easy to evaluate. For finite size plates with significant impact damage, the CAI-SS test method is recommended for post impact strength assessment. For large sandwich panels with relatively small impact damages the CAI-SW test method could be more relevant since it includes effects of panel asymmetry generated from the impact damage. The BAI test method may be recommended as an alternative to CAI but quite long specimens are required in order to assure compressive failure in the tested face-sheet, making the test both demanding and expensive. On the other hand, lower load levels are required to break the specimens and there is less need for precise machining during specimen manufacturing. A finite element model including progressive damage evolution was used to estimate the post impact strength. The simulations showed generally good agreement with the experiments.

复合夹层材料提供高弯曲性能重量比。然而，这些材料容易受到冲击损坏，这会大大降低它们的承载能力。目前缺乏用于影响评估的标准化测试方法。本研究比较了三种不同的影响评估测试方法；冲击后单层皮肤压缩 (CAI-SS)、冲击后夹层压缩 (CAI-SW) 和冲击后四点弯曲 (BAI)。CAI-SS 测试方法显示出较高的抗压强度和破坏应变，并且测试仪相对容易评估。对于具有显着冲击损伤的有限尺寸板，推荐使用 CAI-SS 测试方法进行冲击后强度评估。对于具有相对较小冲击损坏的大型夹层板，CAI-SW 测试方法可能更相关，因为它包括由冲击损坏产生的面板不对称的影响。可以推荐 BAI 测试方法作为 CAI 的替代方法，但需要相当长的样本以确保测试面板的压缩破坏，这使得测试要求高且成本高。另一方面，破坏试样所需的载荷水平较低，并且在试样制造过程中对精密加工的需求较少。包括渐进损伤演变的有限元模型用于估计冲击后强度。模拟显示总体上与实验一致。可以推荐 BAI 测试方法作为 CAI 的替代方法，但需要相当长的样本以确保测试面板的压缩破坏，这使得测试要求高且成本高。另一方面，破坏试样所需的载荷水平较低，并且在试样制造过程中对精密加工的需求较少。包括渐进损伤演变的有限元模型用于估计冲击后强度。模拟显示总体上与实验一致。可以推荐 BAI 测试方法作为 CAI 的替代方法，但需要相当长的样本以确保测试面板的压缩破坏，这使得测试要求高且成本高。另一方面，破坏试样所需的载荷水平较低，并且在试样制造过程中对精密加工的需求较少。包括渐进损伤演变的有限元模型用于估计冲击后强度。模拟显示总体上与实验一致。包括渐进损伤演变的有限元模型用于估计冲击后强度。模拟显示总体上与实验一致。包括渐进损伤演变的有限元模型用于估计冲击后强度。模拟显示总体上与实验一致。