1、 ENGINEERING STANDARDS Test Procedure SUPERCEDED EDS-T-7742 Steel Ball Impact Test This standard may be applied only for current projects. It is Superceded for all future projects and replaced by GME60407. 8TdD9 9PE8 !2e 4G - Note: 8 E:48t G8 =97 FF7 957%L+ , FG P-P Program .Bd# GME60407 ) $4=F7 957
2、F$ . Copyright 2011 General Motors Company All Rights Reserved November 2011 Originating Department: GM Korea Engineering Standards Page 1 of 5 Version : 4 1 Scope Note: Nothing in this standard supersedes applicable laws and regulations. Note: In the event of conflict between the Korean and English
3、 language, the Korean language shall take precedence. 1.1 Purpose. This standard specifies the test method of determining the impact resistance of the organic coating when dropping the hardened steel ball from a specified height onto the coating surface. 1.2 Applicability. This standard shall be use
4、d to determine the impact resistance of organic coatings. It is applicable for single or multi-coat systems applied onto metallic or polymeric. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standard
5、s/Specifications. None 2.3 Additional References. None 3 Resources 3.1 Equipment. 3.1.1 Steel Ball.10 mm diameter balls made from high carbon chromium bearing steels, hardened to HRC (Rockwell hardness scale C) 633. 3.1.2 Wool Felt. A rod of 10 mm thick wool felt is used as a support for test pieces
6、. 3.1.3 Coating-Thickness-Measuring Device (Elcometer). 1 P7 :0 : ., E:48 6%L6 $4 )=7 $4d7 )=%P$ . 4.2.8 4.2.6 4.2.7 8 4G 8x 4G D8 $*8 1 cm28 +958p) -I* D# .*%T &: :FF$ . GM KOREA ENGINEERING STANDARDS EDS-T-7742 Copyright 2011 General Motors Company All Rights Reserved November 2011 Page 4 of 5 Ver
7、sion : 4 5 Data 5.1 Evaluation. The impact resistance, expressed as number of test balls per coating thickness shall be calculated using the following formula. S Nd Where, S = Impact resistance in 1/ . N = Total number of balls used. D = Coating thickness in . 6 Safety This standard may involve haza
8、rdous materials, operations, and equipment. This standard does not propose to address all the safety problems 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
9、prior to use. 7 Notes 7.1 Glossary. Not applicable. 7.2 Acronyms, Abbreviations, and Symbols. Not applicable. 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: 5 4G $8Bd 5.1 D4 . !2e 4G 8 0# $8 47 8F 1%P$ . S Nd 7 d2P , S = !2e 1/ . N = 7 17%P I= 8 Q P
10、3L . d = $*8 % . 6 6|987 $4F 7 9 ., E:48t 88G ,p: , 86 , 8/x &%8x E FF 3L 8$ . ., E:48t 87 $4F 170 4)%P +& 6|98 ,l9P8 F8x 9P4F:# 6#$ . &d(2P 17 987 95FF 6|980 I 1B* 9DF , -18 9PF 728 957 7 .* 9IF# 8t ., E:4 1788 =y8 1F8$ . 7 768 9I8 7.1 98,l 76 . F$-1F 68 . 7.2 66 -C dGl . F$-1F 68 . 8 Ed - $* ,l2P!
11、 $+ &%72P ., E:48 87%T &# $80 M8 EdF$ . English Impact Resistance to EDS-T-7742 - 1500 / min. Test Code Test Method Designation ,l 8TdD9 9PE8 !2e - EDS-T-7742 - 1500 / min. 7 9 4G - 4G F+ GM KOREA ENGINEERING STANDARDS EDS-T-7742 Copyright 2011 General Motors Company All Rights Reserved November 201
12、1 Page 5 of 5 Version : 4 9 Release and Revisions This standard was originated in October 1994. It was first approved by Engineering Standard Committee in October 1994. It was first published in October 1994. 9 9P9I -C P9I 8)Y ., E:48t 1994“x 1087 E:4 -Gl4 .7 %L6 , d3TE:41,h7 8F 1994 “x 10 87 38%L6$ . ., E:48t 1994 “x 10 87 ) 9P9I / -PF%L6$ . Issue / P9I8)Y Publication Date / 38 88 Description (Organization) / 9PP9I76 (:04.2P ) 4 NOV 2011 Apply new Engineering Standard Template. Superceded (Polymer / Organic Material Lab Team) / 4 d3TE:4 64 957 . F9I957 =* (G)8*4G D4 )
