1.1 该测试方法用于测定涂层的内部拉伸或压缩应力，是定量的。它适用于通过电镀或化学沉积工艺施加的金属层，其内部拉伸或压缩应力值为200 psi至145 000 psi（1.38 兆帕  至1000MPa）。 1.2 单位- 以国际单位制或英寸磅单位表示的数值应单独视为标准值。每个系统中所述的值不一定完全相等；因此，为了确保符合标准，每个系统应独立使用。单元系统之间的转换可能会导致错误，从而导致混淆，应避免此类错误。 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====== 5.1 由于微裂纹和宏观裂纹的形成，涂层内的内应力可能导致抗腐蚀和侵蚀能力的破坏- 涂层内开裂。这种现象还会导致起泡、剥落、疲劳强度降低和损耗。由此产生的应力可以是拉伸性质的，导致沉积物收缩，也可以是压缩性质的，造成沉积物膨胀。 5.2 为了通过弯条法保持质量保证，有必要监测生产过程中所施加涂层的内部沉积应力的可接受水平。大多数低值都是假的。由于原料边缘毛刺的影响以及原料的抗弯曲性，初始值往往低于实际值。过大的沉积物厚度会导致低于真实值，因为涂层会使试件的初始弹性模量变得过大并发生变化，当涂层继续在其上形成时，试件的弹性模量变得更难弯曲。 这一现象可以通过使用一个公式来显著纠正，该公式可以补偿沉积物和基底材料之间的弹性模量差异，但它仍然是一个因素。看见 公式3 . 注1: 在应力-镀层厚度曲线上获得的内部沉积应力的最高值通常是内部沉积应的最真实值。

1.1 This test method for determining the internal tensile or compressive stress in applied coatings is quantitative. It is applicable to metallic layers that are applied by the processes of electroplating or chemical deposition that exhibit internal tensile or compressive stress values from 200 psi to 145 000 psi (1.38 MPa  to 1000 MPa). 1.2 Units— The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other. Conversion between unit systems may result in errors that can cause confusion and should be avoided. 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 Internal stress in applied coatings exhibits potential to cause a breakdown of resistance to corrosion and erosion as a result of the formation of fractures from micro-cracking and macro-cracking within the applied coating. This phenomenon can also cause blistering, peeling, reduction of fatigue strength, and loss. The resulting stress can be tensile in nature, causing the deposit to contract, or compressive in nature, causing the deposit to expand. 5.2 To maintain quality assurance by the bent strip method, it is necessary to monitor production processes for acceptable levels of internal deposit stress in applied coatings. Most low values are false. Initial values tend to be lower than the actual value because of the effect of stock material edge burrs and the resistance of the stock material to bending. Excessive deposit thickness causes lower-than-true value since the coating overpowers and changes the initial modulus of elasticity of the test piece, which becomes more difficult to bend as the coating continues to build upon it. This phenomenon can be corrected considerably by use of a formula that compensates for modulus of elasticity differences between the deposit and the substrate materials, but it does remain a factor. See Eq 3 . Note 1: The highest value of the internal deposit stress as obtained on a stress-versus-plating-thickness curve is usually the truest value of the internal deposit stress.