1.1 本试验方法包括在室温下，在四点载荷下，使用简单的方形截面梁，测定从石墨电极上切下的试样弯曲时的断裂模量。 1.2 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.3 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。 1.4 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《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 本试验方法提供了一种测定方形截面石墨试样断裂模量的方法，该试样由根据实践获得的电极芯样品加工而成 C783 ，最小芯径57 毫米。本试验方法推荐用于质量控制或质量保证目的，但不应依赖于比较粒径或取向特性完全不同的材料。由于这些原因以及 4.2 可能无法获得弯曲强度的绝对值。 4.2 试样尺寸- 制造的石墨电极的最大粒径和最大孔径变化很大，通常随电极直径增加而增加。试验是在相当短的短短梁上进行的，因此，与弯曲应力相比，剪切应力并不微不足道，并且当使用不同的比率或试样尺寸时，试验结果可能不一致。

1.1 This test method covers determination of the modulus of rupture in bending of specimens cut from graphite electrodes using a simple square cross section beam in four-point loading at room temperature. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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 provides a means for determining the modulus of rupture of a square cross section graphite specimen machined from the electrode core sample obtained according to Practice C783 , with a minimum core diameter of 57 mm. This test method is recommended for quality control or quality assurance purposes, but should not be relied upon to compare materials of radically different particle sizes or orientational characteristics. For these reasons as well as those discussed in 4.2 an absolute value of flexural strength may not be obtained. 4.2 Specimen Size— The maximum particle size and maximum pore size vary greatly for manufactured graphite electrodes, generally increasing with electrode diameter. The test is on a rather short stubby beam, therefore the shear stress is not insignificant compared to the flexural stress, and the test results may not agree when a different ratio or specimen size is used.