1.1 本规程提供了有关设备、试样制备和程序的信息，用于对从壁厚约为1的聚乙烯管中的对接熔合接头上取下的试样上切下的横向试样进行导向三点侧弯评估 在里面（25 mm）及更厚。看见 图1 . 本规程提供了一种评估对接熔合接头延展性的方法，方法是在从全对接熔合横截面（从外径到内径）取的试样上施加横向（侧）弯曲应变。 注1: 壁厚小于1英寸。用户参考实践 F2620 ，附录X4.1，用于弯曲试验。 图1 导向侧弯概念示意图 1.2 本规程未提供测试值。结果是非数值报告。标准或规范中提供了测试结果评估标准，这些标准或规范通过与中所述的基准实验室结果进行比较来规定本规程的使用 5.3 或与中给出的示例结果进行比较 附录X1 这种做法。 1.3 单位- 以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 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。 注2: 通常用于测试聚乙烯对接熔合接头的实验室方法包括测试方法 D638 ，试验方法 D790 和试验方法 F2634 . 注3: 本规程适用于壁厚为1的聚乙烯管中的对接熔合接头。 00英寸。或更大。本规程可用于壁厚较薄的聚乙烯管中的对接熔合接头。然而，实践的适用性应由实践的用户决定。 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====== 5.1 本标准实施规程是评估侧弯试样延展性的程序，侧弯试样是管壁和对接熔合的横截面。侧弯试样是从使用壁厚约为1的聚乙烯管制成的样品聚乙烯管对接熔合接头的弯曲试样中制备的 在里面 （25 mm）及以上。通过用加载头将侧弯试样压入两个可旋转支架之间的间隙，对侧弯试样施加三点弯曲。施加弯曲载荷，使弯曲应变横向于熔合接头的平面。 5.2 用于切割弯曲试样、制备侧弯试样和进行此实践的设备可供实验室和现场使用。 5.3 评估现场测试结果的基准标准是通过在受控环境中测试样本对接熔合的统计有效数量来制定的，最好使用现场使用的设备。然后，通过与受控环境的基准测试结果进行比较，对现场测试的导向侧弯测试结果进行评估。

1.1 This practice provides information on apparatus, specimen preparation and procedure for conducting a guided three point side bend evaluation of a transverse specimen cut from a coupon removed from a butt fusion joint in polyethylene pipe having a wall thickness of approximately 1 in. (25 mm) and thicker. See Fig. 1 . This practice provides a means to assess ductility of a butt fusion joint by applying a lateral (side) bending strain across a specimen taken from the full butt fusion cross-section, from outside diameter to inside diameter. Note 1: For wall thicknesses less than 1 in. the user is referred to Practice F2620 , Appendix X4.1 for bend back testing. FIG. 1 Guided Side Bend Conceptual Schematic 1.2 No test values are provided by this practice. The result is a non-numerical report. Criteria for test result evaluation are provided in standards or codes that specify the use of this practice by comparison to benchmark laboratory results as described in 5.3 or by comparison to example results presented in Appendix X1 to this practice. 1.3 Units— 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. 1.4 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. Note 2: Laboratory methods that are commonly used for testing polyethylene butt fusion joints include Test Method D638 , Test Method D790 and Test Method F2634 . Note 3: This practice has been developed for use on butt fusion joints in polyethylene pipe with a wall thickness of 1.00 in. or greater. The practice may be used on butt fusion joints in polyethylene pipe with thinner wall thicknesses. However, the applicability of the practice should be determined by the user of the practice. 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 ====== 5.1 This standard practice is a procedure to evaluate the ductility of side bend test specimens that are a transverse section of the pipe wall and butt fusion. Side bend test specimens are prepared from bend test coupons from sample polyethylene pipe butt fusion joints that are made using polyethylene pipe having a wall thickness of approximately 1 in. (25 mm) and greater. A three-point bend is applied to the side bend test specimen by pressing the side bend test specimen into a gap between two rotatable supports with a loading nose. The bending load is applied such that the bending strain is transverse to the plane of the fusion joint. 5.2 Equipment for cutting bend test coupons, preparing side bend test specimens and conducting this practice is available for laboratory and for field use. 5.3 Benchmark criteria for evaluating field testing results are developed by testing a statistically valid number of sample butt fusions in a controlled environment, preferably using equipment for field use. Guided side bend test results from field tests are then evaluated by comparison to benchmark test results from the controlled environment.