Debonds and other interfacial damages in sandwich composites can occur during manufacturing processes, accidental overloads and material manipulation, and debonds might propagate under both static and cyclic loading scenarios during the service lifetime of the structure (Shipsha et al 1999, Quispitupa et al 2008). Debonds are of great concern, since the bending stiffness of a sandwich structure is dominated by the contribution of the faces with respect to the neutral axis of the entire sandwich, and in the absence of the bond between faces and core, almost the entire bending stiffness and thus the strength of the structure are lost. To investigate and measure interface fracture properties the mixed mode bending (MMB) (Reeder and Crews 1990) test is a promising candidate, Fig. 1.
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机译：三明治中的脱胶和其他界面损伤
复合材料可能会在制造过程中发生，意外的过载和材料处理，并且在结构的使用寿命期间，在静态和循环载荷的情况下，粘结可能会扩散（Shipsha等，1999; Quispitupa等，2008）。脱胶非常令人担忧，因为夹心结构的弯曲刚度受面相对于整个夹心中性轴的影响所支配，并且在面与芯之间不存在粘结的情况下，几乎整个抗弯刚度从而失去了结构的强度。为了研究和测量界面断裂特性，混合模式弯曲（MMB）测试（Reeder and Crews 1990）是一个很有前途的候选者，图1。
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