1.1 本试验方法旨在补充试验方法 2002年1月 并将其应用扩展到刚性塑料被粘物的单搭接剪切粘合接头。该试验方法可用于生成由多种塑料制成的接头的比较抗剪强度数据。它还可以提供一种比较几种塑料表面处理的方法。 1.2 以国际单位制表示的数值应视为标准。括号中的值仅供参考。 1.3 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建立适当的安全、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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 4.1 由于粘结而非机械紧固接头所提供的固有优势，特别是应力增加和应力开裂的缓解，粘合剂粘结塑料的使用量增加，因此需要进行标准测试，通过标准测试可以比较各种塑料基材和粘合剂的接头。 该测试方法旨在满足这种需求。 4.2 该试验方法仅限于低于受试被粘物软化点的试验温度，不适用于各向异性被粘物，如增强塑料层压板。 4.3 误用本试验方法获得的强度值作为结构接头的容许设计应力值可能导致产品失效、财产损失和人身伤害。从给定的小单搭接试样获得的粘合剂的表观剪切强度可能不同于从由不同的被粘物或通过不同的粘结工艺制成的接头获得的粘合剂。使用环境中温度和湿度的正常变化会导致被粘物和粘合剂膨胀和收缩。 被粘物和粘合剂可能具有不同的热膨胀系数和湿膨胀系数。即使在小样本中，短期环境变化也会在粘合剂中引起内应力或化学变化，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头中使用不同类型的被粘物，则预测变化环境中的接头行为的问题甚至更困难。 4.3.1 使用单搭接试样测量的表观抗剪强度不适用于确定设计结构接头的容许设计应力，该结构接头在任何方面都不同于未对接头和粘合性能进行彻底分析和了解的试验接头。 4.3.2 单搭接试验可用于比较和选择粘合剂或粘合工艺对疲劳和环境变化的敏感性，但此类比较必须非常谨慎，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型 以进一步讨论与粘合剂粘结单搭接接头的解释相关的概念。

1.1 This test method is intended to complement Test Method D1002 and extend its application to single-lap shear adhesive joints of rigid 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 plastic surface treatments can be compared. 1.2 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only. 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 Due to the increased use of adhesive-bonded plastics as a result of the inherent advantages afforded by bonded rather than mechanically fastened joints, particularly the alleviation of stress raisers and stress cracking, there is a need for standard tests by which joints of various plastic 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 allowable design-stress values for structural joints could lead to product failure, property damage, and human injury. 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. 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. 4.3.1 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. 4.3.2 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.