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ASTM C978-02
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Standard Test Method for Photoelastic Determination of Residual Stress in a Transparent Glass Matrix Using a Polarizing Microscope and Optical Retardation Compensation Procedures
使用偏光显微镜和光学延迟补偿程序对透明玻璃基体中的残余应力进行光弹性测定的标准测试方法
1.1本试验方法包括使用零补偿或延迟补偿程序,通过偏光显微镜测定透明玻璃基质中的残余应力。
1.2此类残余应力测定对于评估玻璃基质中由于帘线、配合程度、玻璃基质和搪瓷的特定组合的适用性或应用的彩色标签(ACL)而产生的残余应力的性质和程度具有重要意义。
1.3光学测定和评估搪瓷或ACL残余应力系统的延迟补偿方法由于其简单性、再现性和精度,与需要物理性能测量或陶瓷性能测试的方法相比具有明显的优势。
1.4
局限性
-本试验方法基于应力光学延迟补偿原理,因此仅适用于透明玻璃基板,不适用于不透明玻璃系统。
1.5由于不同成分的玻璃之间的离子交换可能产生额外的残余应力,由于缺乏对感兴趣区域化学成分的准确知识,可能会在感兴趣点的应力光学系数值中引入一些不确定性。
1.6本试验方法在数量上适用于且仅适用于此类重要离子交换不是因素且应力光学系数已知或可确定的应用。
1.7离子交换过程的程度以及由此产生的残余应力的大小将取决于交换过程参数。在离子交换发生的系统上进行的残余应力测定应考虑到这些相关性。
1.8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。
1.9
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。
1.1 This test method covers the determination of residual stresses in a transparent glass matrix by means of a polarizing microscope using null or retardation compensation procedures.
1.2 Such residual stress determinations are of importance in evaluating the nature and degree of residual stresses present in glass matrixes due to cord, or the degree of fit, or suitability of a particular combination of glass matrix and enamel, or applied color label (ACL).
1.3 The retardation compensation method of optically determining and evaluating enamel or ACL residual stress systems offers distinct advantages over methods requiring physical property measurements or ware performance tests due to its simplicity, reproducibility, and precision.
1.4
Limitations
—This test method is based on the stress-optical retardation compensation principle, and is therefore applicable only to transparent glass substrates, and not to opaque glass systems.
1.5 Due to the possibility of additional residual stresses produced by ion exchange between glasses of different compositions, some uncertainty may be introduced in the value of the stress optical coefficient in the point of interest due to a lack of accurate knowledge of chemical composition in the areas of interest.
1.6 This test method is quantitatively applicable to and valid only for those applications where such significant ion exchange is not a factor, and stress optical coefficients are known or determinable.
1.7 The extent of the ion exchange process, and hence the magnitudes of the residual stresses produced due to ion exchange will depend on the exchange process parameters. The residual stress determinations made on systems in which ion exchange has occurred should be interpreted with those dependencies in mind.
1.8 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.9
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.