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GB/T 36405-2018: Test Method for Stress in Flat Glass Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 36405-2018: Test Method for Stress in Flat Glass---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT36405-2018GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA Test Method for Stress in Flat Glass Issued on: JUNE 7, 2018 Implemented on: MAY 1, 2019 Issued by. State Administration for Market Regulation of the People’s Republic of China; Standardization Administration Committee of the People’s Republic of China. Table of ContentsForeword ... 3 1 Scope ... 4 2 Normative References ... 4 3 Terms and Definitions ... 4 4 Test Principle ... 5 5 Stress Test Method ... 7 6 Test Report ... 15ForewordThis Standard is drafted in accordance with stipulations in GB/T 1.1-2009. This Standard is proposed by China Building Materials Federation. This Standard is summarized by National Technical Committee 255 on Architectural Glass of Standardization Administration of China (SAC/TC 255). This Standard is drafted by China Building Material Test & Certification Group Qinhuangdao Co., Ltd. (National Glass Quality Supervision and Inspection Center), China Construction Fourth Engineering Division Co., Ltd., TAIWANGLASS CFG, Center Testing International Group Co., Ltd., Beijing Aoptek Scientific Co., Ltd., Flat Glass Group, Fuyao Glass, Foshan Shunde District Quality and Technology Supervision Standard and Coding Office, Hubei Provincial Academy of Building Research and Design, Sichuan Henggu Construction Project Examination Co., Ltd., Dongguan HUAXI Mechanical and Electrical Engineering Co., Ltd., Hebei RUN’AN Building Material Co., Ltd., Beijing Xin Yuan Bo Heng Detection Science and Technology Co., Ltd., Hebei Macros Star Detection Co., Ltd. The main drafters of this Standard include. Ji Shuwei, Zhang Zhemin, Wuxiao, Huang Jianbin, Li Xingang, Liyao, Lihu, Yangwei, Xujiang, Ruan Hongliang, Gaofeng, He Shimeng, Li Junsheng, Zhouqun, Shen Minqi, Wen Hanping, Sang Luming, Meng Caiqing, Ligen. Test Method for Stress in Flat Glass1 ScopeThis Standard specifies terms, definition, test principle, stress test method and test report related with flat glass stress test. This Standard is applicable to the test of annealed flat glass plane stress and plate thickness stress.2 Normative ReferencesThe following documents are indispensable to the application of this Standard. In terms of references with a specified date, only versions with a specified date are applicable to this Standard. The latest version (including all the modifications) of references without a specified date is also applicable to this Standard. GB/T 15764 Standard Definitions of Terms Relating to Flat Glass3 Terms and DefinitionsThe following terms and definitions, as well as terms and definitions provided in GB/T 15764 are applicable to this Standard. 3.1 Plane Stress Plane stress is permanent tensile stress or compressive stress that exists among different areas of plane glass after the glass is molded. 3.2 Interior Stress It is permanent stress generated by temperature gradient under the plate thickness direction after the glass is molded. Compressive stress exists on the surface, and tensile stress exists in the central area. 3.3 Polarizer Polarizer is placed between light source and the sample being tested. It turns natural light into a device with plane polarized light and a certain vibration direction. 3.4 Analyzer Analyzer is placed between the sample being tested and the observer. It is a polarizing device adopted to analyze polarization. Randomly draw a piece of finished product, and cut 600 mm x 600 mm of sample along the same direction or the direction of the board width. 5.1.3.2 Sample processing Rinse the sample, guarantee that the surface is clean and there’s no attachment. 5.1.4 Determination of test area The central section (diameter. 500 mm) of the sample is test area. 5.1.5 Test steps Please see the test steps below. a) Measure the thickness of the sample (accurate to 0.1 mm); b) Activate stress detector; make the main direction of the polarizer and analyzer mutually orthogonal; c) Place the test sample between the polarizer and analyzer, then, make the surface of the sample vertical to the optical path; horizontally place the samples in accordance with the pulling direction; d) Operate the stress detector through the test and control software in accordance with the instrument specification, then, complete the stress test and calculation of the test area; e) Record stress distribution diagram and the measured stress value of various points in the test area in accordance with the sample number. 5.1.6 Expression of test result 5.1.6.1 Plate stress distribution diagram Calculate the stress value of the test area of the test sample in accordance with Formula (6). Calculate the absolute value of the stress value on the plane of x y coordinate; draw the plane stress distribution of the test sample with grayscale or colors. 5.1.6.2 Average value of plate stress Calculate the positive value of tensile stress and compressive stress; calculate the arithmetic mean value of stress within the test area. 5.1.6.3 Maximum value of plate stress The maximum value of the absolute value of stress within the test area. Where. I (x, y) - Light intensity distribution detected by camera; Io - Same as Formula (7); T - Same as Formula (7); ẟ (x, y) - Stress birefringence phase difference of the test point, expressed in (rad). Stress birefringence phase difference of the test point shall be calculated in accordance with Formula (9). 5.2.4 Stress calculation Birefringence optical path difference △ (x, y) shall be calculated in accordance with Formula (2). Plate thickness stress of various test points shall be calculated in accordance with Formula (10). Where. σ (x, y) - The stress value of the test sample, expressed in (MPa); C - The stress-optical constant of the test glass, expressed in (MPa-1); the stress- optical constant of soda-lime silica glass shall be calculated as 2.6x10-6 MPa-1; d - The distance of light transmission in the glass, expressed in (mm); the actual measured value between the two polished sides in the central part of the test sample shall be calculated; △ (x, y) - The birefringence optical path difference of the test sample, expressed in (nm). 5.2.5 Plate thickness stress distribution curve In terms of different y in Formula (10), respectively take 20 adjacent pixels in the central part of the sample under x direction. Calculate the distribution curve of stress arithmetic mean value that corresponds with the various y values; smooth and fit . Uniformly take 50 points of y in accordance with glass plate thickness. Obtain plate thickness stress distribution curve σ (y), as it is shown in Figure 6. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 36405-2018 be delivered?Answer: The full copy PDF of English version of GB/T 36405-2018 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 36405-2018_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 36405-2018_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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