1.1 本试验方法包括测定与面板平面内剪切变形相关的木质结构面板的剪切模量。该方法适用于所有类型的木质结构面板。单个层、叠片或层的晶粒方向或取向应与试样边缘平行或垂直。如果层、叠片或层的材料或弹性财产不同，则该方法可给出有效剪切模量。使用的木质结构面板包括胶合板、定向刨花板、单板和木质层复合材料。 注1: 该试验方法主要设计用于单个层、叠片或层的晶粒或方向与试样边缘平行或垂直的材料。 然而，如果使用具有相同厚度的四层面板，则可将其用于纹理与试样边缘成45°的胶合板试样。控制条件是EI（弹性模量 × 惯性矩）值应相等。 1.2 以英寸-磅单位表示的值应视为标准值。括号中给出的值是对SI单位的数学转换，仅供参考，不被视为标准值。 1.3 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 4.1 该试验方法对于确定正交各向异性材料的刚度模量最为有用，因为不能根据弹性模量和泊松比计算刚度模量。通过该方法确定的剪切模量出现在控制板弯曲的方程式中。这是讨论板的挠曲和屈曲所需的模量。 注2: 试验方法 718年 描述了用于确定结构板的刚度模量的板方法。

1.1 This test method covers determination of the shear modulus of wood-based structural panels associated with shear distortion in the plane of the panels. The method is applicable to all types of wood-based structural panels. The grain direction or orientation of the individual plies, laminations, or layers shall be parallel or perpendicular to the edge of the test specimen. If the plies, laminations, or layers are of different material or elastic properties, the method gives the effective shearing modulus. Wood-based structural panels in use include plywood, oriented strand board, and composites of veneer and of wood-based layers. Note 1: This test method is primarily designed for material in which the grain or orientation of the individual plies, laminations, or layers is parallel or perpendicular to the edge of the specimen. It may be used, however, for plywood specimens in which the grain is at 45° to the specimen edges if a four-ply panel with all plies of the same thickness is used. The controlling condition is that the EI (modulus of elasticity × moment of inertia) values along both diagonals shall be equal. 1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 This test method is most useful for determining the moduli of rigidity of orthotropic materials for which moduli of rigidity cannot be computed from elastic moduli and Poisson's ratios. The shear modulus determined by this method appears in the equation governing the bending of a plate. This is the modulus that is needed in discussing the deflection and buckling of plates. Note 2: Test Methods D2718 describes a plate method for determination of modulus of rigidity of structural panels.