The mechanical behavior of a sandwich structure made of woven glass/epoxy skins and an additive manufactured (AM) core was studied. The AM core was fabricated using polyetherimide and fused deposition modeling. This combination was chosen to increase the out-of-plane strength of an AM aircraft part. Tensile, flexural, and puncture tests were conducted for both the AM core and sandwich structure. The behavior of the beams was governed by the skins; however, the effect of the AM core for one-sided beams was significant. The tensile strength predicted by the simple mixture rule was in good agreement with the experimental results. For the flexural test specimen, sandwich beams were tested under three-point bending. The addition of composite skins increased the elastic modulus and flexural strength in both directions. The prevalent failure modes were skin wrinkling and core failure, and failure of the compressive skin was more likely. Puncture tests were conducted at three different temperatures. Owing to the increased bending stiffness, the sandwich structure did not exhibit ductile-to-brittle transition behavior.

研究了由机织玻璃/环氧树脂蒙皮和增材制造（AM）芯制成的三明治结构的机械性能。AM核是使用聚醚酰亚胺和熔融沉积模型制造的。选择该组合以增加AM飞机零件的平面外强度。对AM芯和三明治结构都进行了拉伸，弯曲和穿刺测试。光束的行为受皮肤控制。但是，AM磁芯对单边光束的影响是显着的。简单混合法则预测的抗拉强度与实验结果吻合良好。对于挠曲测试样品，在三点弯曲下测试了夹层梁。复合表皮的添加增加了两个方向上的弹性模量和抗弯强度。普遍的失败模式是皮肤起皱和核心失败，而压迫性皮肤的失败更有可能发生。在三个不同的温度下进行穿刺测试。由于增加的弯曲刚度，三明治结构没有表现出韧性到脆性的转变行为。