1.1 本试验方法描述了使用热机械分析仪（TMA）在三点弯曲中使用线性控制加载速率来确定矩形棒材形式的各向同性试样的弹性模量。 注1: 该方法旨在提供与试验方法类似的结果 D790号 或 D5934型 但使用较小的试样在热机械分析仪上进行。在用户证明等效性之前，该方法的结果应被视为独立的，与试验方法的结果无关 D790号 或 D5934型 . 1.2 该试验方法为确定应力线性区域内的弹性模量提供了一种方法- 应变曲线（参见 图1 ). 本试验在-100°C至300°C的等温温度条件下进行。 图1 应力-应变曲线（线性区域） 1.3 典型试样为薄带0.5 厚度mm，1.5 mm宽，6 长度为mm。试样尺寸受三点弯曲操作模式中所用支架之间的距离限制，通常为0.5 厘米 1.4 以国际单位表示的数值视为标准值。本标准不包括其他计量单位。 1.5 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。 1.6 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====== 5.1 本试验方法提供了一种方法，用于表征使用少量材料（包括热塑性和热固性聚合物、复合材料和金属）的材料的机械性能。 5.2 所得数据可用于研究、开发和确定最佳工艺条件。 这些数据不用于设计或预测性能。 注2: 该试验方法可能不适用于各向异性材料。

1.1 This test method describes the use of linear controlled-rate-of-loading in three-point bending to determine the elastic modulus of isotropic specimens in the form of rectangular bars using a thermomechanical analyzer (TMA). Note 1: This method is intended to provide results similar to those of Test Methods D790 or D5934 but is performed on a thermomechanical analyzer using smaller test specimens. Until the user demonstrates equivalence, the results of this method shall be considered independent and unrelated to those of Test Methods D790 or D5934 . 1.2 This test method provides a means for determining the elastic modulus within the linear region of the stress-strain curves (see Fig. 1 ). This test is conducted under isothermal temperature conditions from –100 °C to 300 °C. FIG. 1 Stress-Strain Curve (Linear Region) 1.3 Typical test specimens are in the form of thin strips 0.5 mm in thickness, 1.5 mm in width, and 6 mm in length. The size of the test specimen is limited by the distance between the supports used in the three-point bending mode of operation, commonly 0.5 cm. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 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. 1.6 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 ====== 5.1 This test method provides a means of characterizing the mechanical behavior of materials using very small amounts of material including thermoplastic and thermoset polymers, composites, and metals. 5.2 The data obtained may be used for research and development and establishment of optimum processing conditions. The data are not intended for use in design or for predicting performance. Note 2: This test method may not be suitable for anisotropic materials.