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GB/T 38494-2020 PDF in English
GB/T 38494-2020 (GB/T38494-2020, GBT 38494-2020, GBT38494-2020)
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GB/T 38494-2020
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Test method for impact resistance of ceramic wares
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GB/T 38494-2020
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GB/T 38494-2020: PDF in English (GBT 38494-2020)
GB/T 38494-2020 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 81.060.20 Y 24 Test Method for Impact Resistance of Ceramic Wares ISSUED ON: MARCH 06, 2020 IMPLEMENTED ON: OCTOBER 01, 2020 Issued by: State Administration for Market Regulation; Standardization Administration of PRC. Table of Contents Foreword ... 3 1 Scope ... 4 2 Terms and Definitions ... 4 3 Principle ... 4 4 Apparatus and Utensils ... 5 5 Specimen ... 5 6 Procedures ... 5 7 Calculation Formula ... 6 8 Presentation of Results ... 7 9 Test Report ... 7 Test Method for Impact Resistance of Ceramic Wares 1 Scope This Standard specifies the test method for the impact resistance of ceramic wares. This Standard is applicable to the impact test of the centre and edge of the bottom of the ceramic wares. 2 Terms and Definitions For the purpose of this document, the following terms and definitions apply. 2.1 Impact energy The energy that is required for generating cracks or breakage of ceramic wares. 2.2 Impact resistance The impact energy (edge impact strength) or the square ratio of impact energy to thickness (centric impact strength) that is required for generating cracks or breakage of ceramic wares. 2.3 Centric position The centre of the bottom of the ceramic wares. 2.4 Edge position The position, when the bottom of the ceramic ware is placed flat on a plane, that the edge of the mouth is in contact with the pendulum. 3 Principle The method, when the pendulum is released from a certain height to the lowest point, and the potential energy is converted into kinetic energy to impact the ceramic wares to cause cracks or breakage, which is used to characterize the impact resistance of the ceramic wares. 6.1.3 Incremental test Place the pendulum at the lowest energy position; release the pendulum to impact the specimen; block the pendulum with hand or other objects to avoid secondary impact; observe whether the specimen is cracked or damaged. Gradually increase the impact energy until the sample is cracked or damaged. 6.1.4 Results recording Record the impact energy when cracks or breakage occur, and measure the thickness of the centric point of the specimen. 6.2 Edge impact test 6.2.1 Placement of the sample The sample is placed flat on the fixed table and fixed; the pendulum is placed at the lowest point. And the sample fixed table is adjusted so that the impact point of the pendulum is at the thinnest and most prominent position of the edge of the specimen. 6.2.2 Fixed value test Place the pendulum at a predetermined energy position; release the pendulum to impact the specimen; block the pendulum with hand or other objects to avoid secondary impact. Take out the specimen, and observe whether the specimen is cracked or damaged. 6.2.3 Incremental test Place the pendulum at the lowest energy position; release the pendulum to impact the specimen; block the pendulum with hand or other objects to avoid secondary impact; observe whether the sample is cracked or damaged. Gradually increase the impact energy until the sample is cracked or damaged. 6.2.4 Results recording Record the impact energy when cracks or breakage occur. 7 Calculation Formula The calculation of impact resistance in the centric impact test is shown in Formula (1): Where:
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Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.