1.1 本试验方法规定了形状记忆合金（SMA）材料和部件在恒定力下的热机械循环程序。当SMA在恒定的作用力下通过相变进行热循环时，该方法表征了相变特性，如相变温度、致动应变和残余应变。本试验旨在为SMA材料的选择、质量控制、设计容许值和致动器设计提供数据。 1.2 单位- 以国际单位制表示的数值应视为标准。本标准中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。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 恒力热循环试验确定了应力对形状记忆合金的转变温度、恢复应变和残余应变的影响。测试可能针对一个热循环。 形状记忆合金的力控制重复热循环的标准测试方法目前正在开发中。 5.2 试样热机械性能的测量与许多形状记忆应用密切相关，并提供了适用于材料功能的结果。 5.3 此测试方法可用于但不限于金属丝、圆管或条形样品。因此，它能够提供对半成品形式的产品的评估。 5.4 该试验方法提供了一种简单的方法，通过加热和冷却试样，使其在力作用下完全热转变，从而确定转变温度。 5.5 该测试方法可用于半成品中经过训练和加工的材料- 通过比较没有最小施加应力的奥氏体状态和马氏体状态下的应变来测量双向形状记忆效应。将力设置为不超过7MPa对应应力的最小值（根据试验方法 第516页 )。 5.6 这种测试方法有助于质量控制、规范验收和研究。 5.7 由于应变和应力对转变的影响，从该试验方法得出的转变温度可能与通过其他试验方法获得的转变温度不一致。 5.8 弹簧或其他半成品等部件可以使用客户和供应商同意的方法进行测试。应力和应变的单位可以用力和位移来代替。

1.1 This test method defines procedures for thermomechanical cycling of shape memory alloy (SMA) material and components under constant force. This method characterizes the transformation properties such as transformation temperatures, actuation strain and residual strain, when a SMA is thermally cycled through the phase transformation under a constant applied force. This test is done to provide data for the selection of SMA materials, quality control, design allowables and actuator design. 1.2 Units— 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 ====== 5.1 Constant force thermal cycling tests determine the effect of stress on the transformation temperatures, recovered strain and residual strain of a shape memory alloy. The tests may be for one thermal cycle. A standard test method for force controlled repeated thermal cycling of shape memory alloys is currently under development. 5.2 Measurement of the specimen's thermomechanical behavior closely parallels many shape memory applications and provides a result that is applicable to the function of the material. 5.3 This test method may be used for, but is not limited to, wire, round tube, or strip samples. Thus it is able to provide an assessment of the product in its semi-finished form. 5.4 This test method provides a simple method for determining transformation temperatures by heating and cooling specimens through their full thermal transformation under force. 5.5 This test method can be used on trained and processed material in a semi-finished form to measure Two Way Shape Memory Effect by comparing the strain in the austenite state and martensite states with no minimal applied stress. The force is set to a minimum value not to exceed a corresponding stress of 7 MPa (in accordance Test Method F2516 ). 5.6 This test method is useful for quality control, specification acceptance, and research. 5.7 Transformation temperatures derived from this test method may not agree with those obtained by other test methods due to the effects of strain and stress on the transformation. 5.8 Components such as springs or other semi-finished parts can be tested using this method as agreed upon by the customer and supplier. Units of stress and strain can be replaced with force and displacement.