GB/T 2423.55-2023 PDF EnglishUS$505.00 · In stock · Download in 9 seconds
GB/T 2423.55-2023: Environmental testing - Part 2: Test methods - Test Eh: Hammer tests Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 2423.55: Historical versions
Similar standardsGB/T 2423.55-2023: Environmental testing - Part 2: Test methods - Test Eh: Hammer tests---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/GBT2423.55-2023GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 19.040 CCS K 04 GB/T 2423.55-2023 / IEC 60068-2-75.2014 Replacing GB/T 2423.55-2006 Environmental testing - Part 2.Test methods - Test Eh. Hammer tests (IEC 60068-2-75.2014, Environmental testing -- Part 2-75.Tests -- Test Eh. Hammer tests, IDT) Issued on: SEPTEMBER 07, 2023 Implemented on: APRIL 01, 2024 Issued by. State Administration for Market Regulation; Standardization Administration of the People's Republic of China. Table of ContentsForeword... 4 Introduction... 6 1 Scope... 7 2 Normative references... 7 3 Terms and definitions... 8 4 General principles for hammer test methods... 9 4.1 Severity level... 9 4.2 Test apparatus... 9 Table 1 -- Striking element characteristics... 10 Figure 1 -- Typical schematic diagram of an striking element... 10 4.3 Pretreatment... 11 4.4 Initial testing... 11 4.5 Test... 11 4.6 Restoration... 12 4.7 Final testing... 12 4.8 Information to be provided in the relevant specifications... 12 5 Test Eha. Pendulum... 13 5.1 Test apparatus... 13 Figure 2 -- Measuring points... 13 5.2 Height of fall... 14 Table 2 -- Height of fall... 14 5.3 Tests... 14 6 Test Ehb. Spring hammer... 14 6.1 Test apparatus... 14 Figure 3 -- 2 J release end shape... 15 6.2 Effect of gravity... 15 6.3 Calibration... 16 7 Test Ehc. Vertical drop weight... 16 7.1 Test apparatus... 16 7.2 Height of fall... 16 Annex A (normative) Shape of the striking element... 17 Figure A.1 -- Examples of striking elements with a force less than or equal to 1 J... 18 Figure A.2 -- Example of a 2 J striking elements... 18 Figure A.3 -- Example of a 5 J striking element... 19 Figure A.4 -- Example of a 10 J striking element... 19 Figure A.5 -- Example of a 20 J striking element... 20 Figure A.6 -- Example of a 50 J striking element... 20 Annex B (normative) Calibration of spring hammer... 21 B.1 Calibration principle... 21ForewordThis document was drafted in accordance with the rules given in GB/T 1.1-2020 "Directives for standardization - Part 1.Rules for the structure and drafting of standardizing documents". This document is Part 55 of GB/T 2423.The published parts of GB/T 2423 are listed in Annex NA. This document replaces GB/T 2423.55-2006 "Environmental testing for electric and electronic products - Part 2.Test method - Test Eh. Hammer tests". Compared with GB/T 2423.55-2006, in addition to structural adjustments and editorial changes, the main technical changes are as follows. a) Changed the setting of test parameter values and the consideration of their continuity (see 4.1.2, Table 1 and Table 2 of this Edition); b) Changed the terms and definitions, and centralized the terms of different types of comparable test devices to reflect standardization and uniformity (see Chapter 3 of this Edition; 3.1, 4.1 and 5.1 of Edition 2006); c) Added the description of the installation requirements in the hammer test. "Care shall be taken to ensure that there is no obvious air gap between this layer of nylon and the support." (see 4.2.2 of this Edition; 3.3.2 of Edition 2006); d) Changed the description of the striking element in the vertical drop hammer test device (see 7.1 of this Edition; 6.2 of Edition 2006); e) Added further provisions and example descriptions of the surface and internal structure of the basic test device components (see Figure 1, Figure 2 and Figure E.1 of this Edition); f) Changed the applicable scope of the basic test device components (see 6.1, Figure D.2 of this Edition; 5.1, Figure D.2 of Edition 2006); g) Added more accurate instructions and annotations for the test device structure and parts in the pictures (see the figure notes in Annex A, Annex B and Annex E of this Edition). This document identically adopts IEC 60068-2-75.2014 "Environmental testing -- Part 2-75.Tests -- Test Eh. Hammer tests". The following minimal editorial changes were made to this document. a) Added the informative appendix "Constituent documents of GB/T 2423" (see Annex NA). Environmental testing - Part 2.Test methods - Test Eh. Hammer tests1 ScopeThis document describes three equivalent test methods for subjecting samples to striking under specified severity levels, including the number of striking, energy and direction of striking. It is used to assess the robustness of products in terms of electrical safety. This document is applicable to tests with energy levels from 0.14 J to 50 J. This document gives three suitable apparatuses for the tests. Annex C provides guidance in this regard.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1052, Steels for general engineering purposes NOTE. GB/T 3934-2003, Specification of gauges for general purpose screw threads (ISO 1502.1996, MOD) ISO 2039-2, Plastics -- Determination of hardness -- Part 2.Rockwell hardness NOTE. GB/T 3398.2-2008, Plastics -- Determination of hardness -- Part 2.Rockwell hardness (ISO 2039-2.1987, IDT) ISO 2041, Vibration and shock and condition monitoring -- Vocabulary NOTE. GB/T 2298-2010, Mechanical vibration, shock and condition monitoring -- Vocabulary (ISO 2041.2009, IDT) ISO2768-1, General tolerances -- Part 1.Tolerances for linear and angular dimensions without individual tolerances indications NOTE. GB/T 1804-2000, General tolerances -- Tolerances for linear and angular dimensions without individual tolerance indications (ISO 2768-1.1989, IDT) The calibration striking element is suspended by four ropes "h" at four suspension points located on a horizontal plane 2000 mm above the last stop position of the calibration striking element. The calibration striking element swings the contact point "k" of the striking pendulum. The dynamic contact point shall not move downward more than 1 mm relative to the static position. It can be adjusted by raising the position of the suspension point. The raised distance is equal to the distance between the dynamic and static contact points. With the suspension adjusted, the axis of the calibrated striking element "g" shall remain horizontal and perpendicular to the striking surface of the pendulum "c" during striking. When the calibration striking element is in the static position, the calibration device shall be set so that the head of the calibration striking element is exactly in contact with the contact point "k". To obtain reliable results, the calibration device shall be securely fastened to a heavy support, such as a structural part of a building. The height of fall can be conveniently measured at the center of gravity of the calibrated striking element using a liquid level consisting of two glass tubes "j" connected by a hose. One of the glass tubes is fixed and marked with a scale "1". The calibrated striking element can be positioned with a thin wire "m". The calibrated striking element is released when the thin wire is cut. To determine the scale for the calibration device, draw a circle on the dial, concentric with the bearing of the pendulum and with a radius that extends the circle to the pointer. When the pendulum is in its rest position with a slight block before being struck, the pointer position is marked as 0 J (see Figure B.6). The mass of the calibration striking element is 250 g. A calibration striking energy of 1 J can be obtained using a height of fall of 408 mm ± 1 mm. The suspended calibrated striking element is struck against the spring contact point "k" at the lower end of the pendulum to obtain a 1 J point on the scale. After the striking, the pendulum shall not move any more. This operation is repeated at least 10 times. The average of the pointer indicated points is taken as the 1 J scale. The other scale values on the dial are determined as follows. a) Draw a straight line through the center of the scale circle and the 0 J point; b) The perpendicular projection point of the 1 J point on this line is indicated as P; c) Divide the distance between the 0 J point and the P point into ten equal parts; d) Draw a perpendicular line to the 0 J-P line through each dividing point; ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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