The trapped air in unvented honeycomb core and the surrounding environment can induce a pressure differential across the facesheet during launch ascent. Combined with the presence of a defect, the pressure differential across a facesheet in combination with external loads can cause facesheet failure or unstable facesheet debond growth. While honeycomb core venting is the recommended solution, there might be practical limitations in implementing this solution or the possibility that a structure intended to be vented is partially unvented due to manufacturing issues. A methodology for accepting composite sandwich structures for space applications is presented, which heavily relies on the building block approach to characterize the facesheet strength and interfacial fracture toughness. To demonstrate the approach, an allowable flaw size is defined for a hypothetical flight condition using analyses anchored to subscale tests.

未排气的蜂窝芯和周围环境中滞留的空气会在发射上升过程中引起面板上的压力差。结合缺陷的存在，面板上的压差与外部负载相结合会导致面板故障或面板脱粘生长不稳定。虽然蜂窝芯排气是推荐的解决方案，但在实施该解决方案时可能存在实际限制，或者由于制造问题，打算排气的结构可能部分不排气。提出了一种接受用于空间应用的复合夹层结构的方法，该方法在很大程度上依赖于构建块方法来表征面板强度和界面断裂韧性。为了演示该方法，