1.1 本试验方法包括测量基本共振频率，以计算环境温度下耐火材料的动态杨氏模量、动态剪切模量（也称为刚度模量）和动态泊松比。这些材料的试样具有特定的机械共振频率，由试样的弹性模量、质量和几何形状决定。因此，如果可以测量适当试样的几何形状、质量和机械共振频率，则可以计算动态弹性特性。动态杨氏模量使用弯曲振动模式中的共振频率确定，动态剪切模量使用扭转振动模式中的共振频率确定。 泊松比由动态杨氏模量和动态剪切模量计算得出。 1.2 尽管本文没有具体描述，但该方法也可以在高温下进行，并进行适当的设备修改和计算修改，以补偿热膨胀。 1.3 这些数值以国际单位制表示，并被视为标准。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 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《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 该测试方法是非破坏性的，通常用于材料表征和开发、设计数据生成和质量控制目的。该测试假设试样的特性完全各向同性，这可能不适用于某些耐火材料。 试验还假设试样均匀且有弹性。微裂纹试样很难测试，因为它们不会产生一致的结果。低密度的试样具有阻尼效应，并且在冲击点处容易局部损坏。绝缘砖通常可以用这种技术进行测试，但纤维绝缘材料通常太弱和软，无法测试。 4.2 为了进行质量控制，该试验方法可仅用于测量任何标准尺寸试样的共振频率。如果形状不标准，例如含有孔的滑动门板，则可能不需要或甚至不可行进行弹性模量计算。 由于试样的尺寸和质量不同，因此必须根据统计数据确定每个形状和材料的可接受频率。 4.3 尺寸变化可能会对根据频率测量计算的模量值产生重大影响。可能需要进行表面研磨，以使某些材料达到规定的公差范围。 4.4 由于圆柱形状通常不是由耐火材料制成的，因此本试验方法不包括圆柱形状，但试验方法包括圆柱形状 C215型 .

1.1 This test method covers the measurement of the fundamental resonant frequencies for the purpose of calculating the dynamic Young’s modulus, the dynamic shear modulus (also known as the modulus of rigidity), and the dynamic Poisson’s ratio of refractory materials at ambient temperatures. Specimens of these materials possess specific mechanical resonant frequencies, which are determined by the elastic modulus, mass, and geometry of the test specimen. Therefore, the dynamic elastic properties can be computed if the geometry, mass, and mechanical resonant frequencies of a suitable specimen can be measured. The dynamic Young’s modulus is determined using the resonant frequency in the flexural mode of vibration and the dynamic shear modulus is determined using the resonant frequency in the torsional mode of vibration. Poisson’s ratio is computed from the dynamic Young’s modulus and the dynamic shear modulus. 1.2 Although not specifically described herein, this method can also be performed at high temperatures with suitable equipment modifications and appropriate modifications to the calculations to compensate for thermal expansion. 1.3 The values are stated in SI units and are to be regarded as the standard. 1.4 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. 1.5 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 nondestructive and is commonly used for material characterization and development, design data generation, and quality control purposes. The test assumes that the properties of the specimen are perfectly isotropic, which may not be true for some refractory materials. The test also assumes that the specimen is homogeneous and elastic. Specimens that are micro-cracked are difficult to test since they do not yield consistent results. Specimens with low densities have a damping effect and are easily damaged locally at the impact point. Insulating bricks can generally be tested with this technique, but fibrous insulating materials are generally too weak and soft to test. 4.2 For quality control use, the test method may be used for measuring only resonant frequencies of any standard size specimen. An elastic modulus calculation may not be needed or even feasible if the shape is nonstandard, such as a slide gate plate containing a hole. Since specimens will vary in both size and mass, acceptable frequencies for each shape and material must be established from statistical data. 4.3 Dimensional variations can have a significant effect on modulus values calculated from the frequency measurements. Surface grinding may be required to bring some materials into the specified tolerance range. 4.4 Since cylindrical shapes are not commonly made from refractory materials they are not covered by this test method, but are covered in Test Method C215 .