1.1本国际标准规定了测定纤维增强的面内剪切模量(G12)的方法 使用标准板试样的塑料复合材料。当应用于各向同性材料时，剪切 测量的模量与方向无关。 1.2该方法用于测定试样的剪切模量，但不用于测定剪切 力量。它适用于在一条对角线上的两点上支撑并在另一条对角线上由 连接到横梁上的两个加载点同时移动。 1.3该方法适用于具有热固性和热塑性的纤维增强塑料复合材料 矩阵。 由于在弯曲条件下施加剪切变形，对于具有不同纤维的层压材料 格式和/或不同的取向，材料层必须很好地分布在整个截面上，以便 在整个厚度方向上近似“均匀”。 主要材料轴（如果存在）必须垂直于板边缘（见3.8）。 注:该方法可应用于未增强的聚合物和其他材料（例如金属、陶瓷和金属-或 陶瓷基复合材料）。 对于使用单向板层制造的材料，使用多向试样获得的剪切模量 （即0/90°/_45°）与单向或交叉层（0/90°）材料获得的不同。 1.4该方法使用可模制至选定尺寸的试样进行，该试样由 测试板或从产品的平坦区域加工而成。 1.5该方法规定了样品的优选尺寸。对以下样本进行的测试 其他尺寸，或在不同条件下制备的样品上，可能会产生以下结果: 没有可比性。其他因素，如测试速度和样品的调节，也会影响 结果。因此，当需要比较数据时，必须仔细控制这些因素 录下来了。 注意，在较高的应变水平下，剪切中的应力-应变响应是非常非线性的。本试验方法确定 模量在低应变区域内，不适用于较高应变。

1.1 This International Standard specifies a method for determining the in-plane shear modulus (G12) of fibrereinforced plastic composites using a standard plate specimen. When applied to isotropic materials, the shear modulus measured is independent of direction. 1.2 The method is used to determine the shear modulus of the test specimens but not to determine the shear strength. It applies to a plate supported on two points on one diagonal and loaded on the other diagonal by the simultaneous movement of two loading points attached to a cross-beam. 1.3 The method is suitable for use with fibre-reinforced plastic composites with both thermoset and thermoplastic matrices. Due to the shear deformation being applied under flexural conditions, for laminated materials with different fibre formats and/or different orientations, the layers of material must be well distributed across the section so that it is approximately "homogeneous" in the through-thickness direction. The principal material axes, if present, must be orientated normal to the plate edges (see 3.8). NOTE This method can be applied to unreinforced polymers and other materials (e.g. metals, ceramics and metal- or ceramic-matrix composites). For material fabricated using unidirectional plies, the shear modulus obtained using a multidirectional specimen (i.e. 0°/90°/_ 45°) is not the same as that obtained for unidirectional or cross-ply (0°/90°) material. 1.4 The method is performed using specimens which may be moulded to the chosen dimensions, machined from test plates or machined from flat areas of products. 1.5 The method specifies preferred dimensions for the specimen. Tests which are carried out on specimens of other dimensions, or on specimens which are prepared under different conditions, may produce results which are not comparable. Other factors, such as the speed of testing and the conditioning of the specimens, can influence the results. Consequently, when comparative data are required, these factors must be carefully controlled and recorded. NOTE The stress-strain response in shear is very non-linear at higher strain levels. This test method determines the modulus within a low strain region and is not applicable to higher strains.