1.1 本试验方法旨在补充试验方法 D1002 和试验方法 D3163 并将其应用扩展到使用塑料粘合剂的单搭接剪切粘接接头。该试验方法可用于生成由多种塑料制成的接头的比较剪切强度数据。它还可以提供一种方法来比较几种塑料表面处理。 1.2 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 注1: 测试方法的完整公制配套工具 D3164 已开发- D3164M . 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和健康实践，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 由于粘结而非机械固定接头具有固有优势，特别是应力升高和应力开裂的缓解，因此越来越多地使用粘结塑料，因此需要进行标准试验，通过这些试验可以比较各种基材和粘合剂的接头。本试验方法旨在满足此类需求。 4.2 本试验方法仅限于测试低于受试者粘附物软化点的温度，不适用于各向异性粘附物，如增强塑料层压板。 4.3 将本试验方法获得的强度值误用为结构接头的设计应力允许值可能会导致产品失效、财产损失和人身伤害。 4.4 从给定的单搭接小试样中获得的粘合剂的表观剪切强度可能不同于从由不同粘附物或不同粘接工艺制成的接头中获得的表观剪切强度。使用环境中温度和湿度的正常变化会导致粘附物和粘合剂膨胀和收缩。粘附物和粘合剂可能具有不同的热膨胀系数和水分膨胀系数。 4.5 即使在小样本中，短期环境变化也可能导致粘合剂中的内应力或化学变化，从而永久影响粘合剂的表观强度和其他机械性能。 如果在较大的结构接缝中使用不同类型的粘附物，而不是在小样本中使用，则在不断变化的环境中预测接缝行为的问题更加困难。 4.6 使用单搭接试样测量的表观剪切强度不适用于确定设计结构接缝的允许设计应力，这些结构接缝在任何方面都不同于未彻底分析和理解接缝和粘合行为的测试接缝。 4.7 单搭接试验可用于比较和选择对疲劳和环境变化敏感的粘合剂或粘接工艺，但进行此类比较时必须非常小心，因为不同的粘合剂在不同的接头中可能会有不同的反应。请参阅指南 D4896 进一步讨论与胶粘剂粘接单搭接接头解释相关的概念。

1.1 This test method is intended to complement Test Method D1002 and Test Method D3163 and extend its application to single-lap-shear adhesive joints employing plastic adherends. The test method is useful for generating comparative shear strength data for joints made from a number of plastics. It can also provide a means by which several plastics surface treatments can be compared. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. Note 1: A complete metric companion to Test Method D3164 has been developed — D3164M . 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 and health 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 Due to the increased use of adhesively bonded plastics as a result of the inherent advantages afforded by bonded rather than mechanically fastened joints, particularly the alleviation of stress risers and stress cracking, there is a need for standard tests by which joints of various substrates and adhesives can be compared. This test method is intended to meet such a need. 4.2 This test method is limited to test temperatures below the softening point of the subject adherends, and is not intended for use on anisotropic adherends such as reinforced plastic laminates. 4.3 The misuse of strength values obtained from this test method as design stress allowable values for structural joints could lead to product failure, property damage, and human injury. 4.4 The apparent shear strength of an adhesive obtained from a given small single-lap specimen may differ from that obtained from a joint made with different adherends or by a different bonding process. The normal variation of temperature and moisture in the service environment causes the adherends and the adhesive to swell and shrink. The adherends and adhesive are likely to have different thermal and moisture coefficients of expansion. 4.5 Even in small specimens, short-term environmental changes can induce internal stresses or chemical changes in the adhesive that permanently affect the apparent strength and other mechanical properties of the adhesive. The problem of predicting joint behavior in a changing environment is even more difficult if a different type of adherend is used in a larger structural joint than was used in the small specimen. 4.6 The apparent shear strength measured with a single-lap specimen is not suitable for determining allowable design stresses for designing structural joints that differ in any manner from the joints tested without thorough analysis and understanding of the joint and adhesive behaviors. 4.7 Single-lap tests may be used for comparing and selecting adhesives or bonding processes for susceptibility to fatigue and environmental changes, but such comparisons must be made with great caution since different adhesives may respond differently in different joints. See Guide D4896 for further discussion of the concepts relative to interpretation of adhesive bonded single lap joints.