本文件规定了通过纤维增强塑料复合材料的双梁剪切（DBS）试验确定层间强度和模量的程序。 该方法适用于具有热固性基体的玻璃或碳纤维增强塑料复合材料，前提是获得可接受的层间失效。 本文件仅适用于具有对称和平衡铺层的层压板，因为它避免了弯曲/扭曲或弯曲/伸展耦合变形（见6.2）。首选的铺层是单向的，纤维沿试样（轴向）长度对齐。 测试对特定铺层的适用性- ups、基体和纤维（如天然纤维）通过试验进行评估，以确保获得正确的分层失效。

This document specifies a procedure for determining the interlaminar strength, and modulus, by double beam shear (DBS) tests of fibre-reinforced plastic composites. The method is suitable for use with glass or carbon fibre-reinforced plastic composites with thermoset matrices, providing an acceptable interlaminar failure is obtained. This document only applies to laminate with a symmetrical and balanced lay‐up as it avoids bending/twisting or bending/extension coupling deformations (see 6.2). The preferred lay-up is unidirectional, with fibres aligned along the specimen (axial) length. The suitability of the test for specific lay-ups, matrices and fibres (e.g. natural) are assessed by trial tests to ensure the correct delamination failures are obtained.