1.1 本试验方法包括在规定的制备、调节和压缩载荷条件下，在标准试样上进行试验时，测定用于粘合木材和其他类似材料的粘合剂的比较剪切强度。本试验方法主要用于评估木材粘合剂。 1.2 以国际单位制表示的数值应视为标准值。国际单位制后括号中给出的值仅供参考，不被视为标准值。 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、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《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 不能假设该试验方法测量粘合剂的真实剪切强度。许多因素干扰或影响测量，包括木材强度、试样、剪切工具设计本身以及加载速率。 4.1.1 在使用强力粘合剂制成的接头中，木材断裂非常常见。虽然通常需要较高的木材破坏，但当发生这种情况时，测得的强度低于真实的粘合强度。 4.1.2 试样缺口处的应力集中往往会降低测得的强度。在实木抗剪强度的类似试验中，试验方法 D143 ，这些影响是自校正的，因此测量的强度接近木材的真实剪切强度。通过类比，在本试验方法中可能也是如此，但也涉及其他因素，可能会改变关系。 4.1.3 加载速率根据粘合剂的流变特性影响粘合剂的强度。 粘合剂的粘弹性或塑性越大，效果越明显。像尿素和酚醛这样的热固性粘合剂是有弹性的。可以在0.038至1.27 cm/min（0.015至0.5 in/min）的加载速率范围内测量其粘结强度，且无明显影响。热塑性胶粘剂，如聚醋酸乙烯酯、热熔胶和弹性体基胶粘剂，表现出广泛的弹性、粘弹性和塑性行为。通过改变加载速率，它们的粘结强度将受到不同程度的影响。通常，增加速率会增加测量强度。 4.2 本试验方法适用于产品研究和开发、根据某些产品或性能规范鉴定粘合剂以及监测粘接过程控制。本试验方法可能适用于比较和选择粘合剂，但是，必须小心进行此类比较，因为在不同类型的接头中，某些粘合剂的测量强度可能不同。 通过本试验方法获得的强度值不适合作为未经某些工程设计因素调整的设计抗剪强度值。

1.1 This test method covers the determination of the comparative shear strengths of adhesive bonds used for bonding wood and other similar materials, when tested on a standard specimen under specified conditions of preparation, conditioning, and loading in compression. This test method is intended primarily as an evaluation of adhesives for wood. 1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered 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 ====== 4.1 It cannot be assumed that this test method measures the true shear strength of the adhesive bond. Many factors interfere or bias the measurement including the strength of the wood, the specimen, the shear tool designs themselves, and the rate of loading. 4.1.1 Wood failure is very common in joints made with strong adhesives. Although high wood failure is normally desired, when it occurs the measured strength is lower than the true adhesive bond strength. 4.1.2 Stress concentrations at the notches of the specimen tend to lower the measured strength. In a similar test for the shear strength of solid wood, Test Methods D143 , these effects are self correcting so that the measured strength is close to the true shear strength of the wood. By analogy the same may be true in this test method, however, other factors are also involved and may alter the relationship. 4.1.3 The rate of loading affects the strength of an adhesive bond according to the adhesive’s rheological properties. The more viscoelastic or plastic the adhesive, the greater effect. Thermosetting adhesives like urea- and phenol-formaldehyde are elastic. Their bond strengths can be measured over a range of loading rate from 0.038 to 1.27 cm/min (0.015 to 0.5 in./min) with no apparent affect. Thermoplastic adhesives like polyvinyl acetate, hot melts, and elastomer-based adhesives exhibit a broad range of elastic, viscoelastic, and plastic behaviors. Their bond strengths will be affected to varying degrees by changing the loading rate. Generally, increasing the rate, increases the measured strength. 4.2 This test method is suitable for product research and development, qualifying adhesives in accordance with certain product or performance specifications, and monitoring bonding process control. This test method may be suitable for comparing and selecting adhesives, however, such comparisons must be made with caution since the measured strength of some adhesives may be different in different types of joints. Strength values obtained by this test method are not suitable as design shear strengths values without adjustment by certain engineering design factors.