1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW14093 Determination of Impact Resistance of Plastic Components Copyright 2013 General Motors Company All Rights Reserved June 2013 Page 1 of 4 1 Scope Note: Nothing in this standard supercedes applicable laws and regulations. Note: In the event of c
2、onflict between the English and domestic language, the English language shall take precedence. 1.1 Purpose. The object of this test procedure is to determine the impact resistance of plastic components under specified conditions. 1.2 Foreword. Not applicable. 1.3 Applicability. This test procedure s
3、hall be used for plastic components, which are likely to be subjected to impact stresses. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. GMW3221 2.3 Additional References. N
4、one. 3 Resources 3.1 Facilities. Not applicable. 3.1.1 Calibration. The test facilities and equipment shall be in good working order and shall have a valid calibration label. 3.1.2 Alternatives. Alternative test facilities and equipment may also be used. However, all measuring variables as specified
5、 in this standard shall be determined correctly with respect to their physical definition. 3.2 Equipment. The following apparatus shall be used for the determination of impact resistance: 3.2.1 Apparatus A - Falling Tup Testing Device (See Figure 1). A falling tup/ball testing device where an impact
6、 hammer drops from a predetermined height so as to produce the specified impact energy in free fall onto the test piece. 3.2.2 Apparatus B - Pendulum Impact Testing Machine (See Figure 2). A pendulum impact testing machine where an impact hammer, suspended on a pendulum of specified length, drops fr
7、om a predetermined height so as to produce the specified impact energy on the test piece. Impact hammer to the paragraphs 3.2.1 and 3.2.2: The impact hammer shall have the following dimensions: Diameter 50 mm 1 mm Nose radius 25 mm 1 mm Mass 510 g 1 g 3.2.3 Apparatus C - Steel Ball (See Figure 3). A
8、 steel ball having a weight of 510 g 1 g, which drops from a predetermined height so as to produce the specified impact energy in free fall onto the test piece. 3.2.3.1 Brazil Only. A steel ball having a weight of 500 g 5 g is also permitted. 3.2.4 Low temperature cabinet capable of maintaining -30
9、C 3 C. 3.3 Test Vehicle/Test Piece. 3.3.1 Test Piece. When available, the test sample should be a production representative part. 3.3.2 Test Sample Preparation. The finished component shall be tested. 3.3.3 Conditioning. To GMW3221 - Code A. 3.3.4 Test Piece Supports. Supports shall be provided such
10、 that test pieces may securely fasten to simulate service conditions (in vehicle position) as closely as possible, and to ensure that the impact hammer will strike at right angle to any designated spot on the surface. The supports shall be rigid enough to ensure that the impact force is totally abso
11、rbed by the test piece. 3.4 Test Time. Not applicable. 3.5 Test Required Information. Not applicable. 3.6 Personnel/Skills. Not applicable. 4 Procedure 4.1 Preparation. Not applicable. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduc
12、tion or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14093 Copyright 2013 General Motors Company All Rights Reserved June 2013 Page 2 of 4 4.2 Conditions. The test shall be performed under any of the following test conditions. Such conditions shall be stipu
13、lated on the relevant drawings, material specifications, etc., by the following codings: 4.2.1 Environmental Conditions. Not applicable. 4.2.2 Test Conditions. Deviations from the requirements of this standard shall have been agreed upon. Such requirements shall be specified on component drawings, t
14、est certificates, reports, etc. 4.2.3 Coding 1. Test after accelerated aging and cooling to +23 C 5 C. Accelerated aging according to special data; testing period X, temperature Y (defined on drawing or material specifications). 4.2.4 Coding 2. Test at a temperature of +23 C 5 C. 4.2.5 Coding 3. Mai
15、ntain the plastic component for 4 h at a temperature of -30 C 3 C and test immediately after removal from the low temperature cabinet. 4.3 Instructions. The test piece shall be supported as paragraph 3.3.4 and subjected to the test conditions specified in paragraph 4.2. The test piece and the test p
16、iece support shall be positioned in such a manner that the contact face is at right angles to the direction of movement of the impact hammer. The hammer shall be lifted to the position specified and dropped. Care shall be taken to ensure that only one impact on the same test point occurs. Tests shal
17、l not be repeated on the same test point. 5 Data 5.1 Calculations of Impact Force. In order to clarify how impact energies are calculated for the two pieces of test apparatus specified in paragraph 3.2, the following examples are given in Table 1: Table 1: Force Diagram Symbol Item Unit E Impact for
18、ce J h Drop height (distance between impact hammer and test piece surface) m m Mass of hammer kg Angle of deflection (angle between pendulum at rest and at time of impact) r Length of pendulum measured to impact nose m 5.1.1 Apparatus A - Falling Ball Test. See Figure 1. Impact energy: E = m g h J o
19、r h Em g m A A = Direction of impact force Figure 1: Apparatus A in Principle 5.1.2 Apparatus B - Pendulum Impact Test. See Figure 2. Impact energy: E = m g h J Where: h = r (1 - cos ) m or gmr Egmrarccos Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot f
20、or ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14093 Copyright 2013 General Motors Company All Rights Reserved June 2013 Page 3 of 4 A A = Direction of impact force Figure 2: Apparatus B in Principle During pendulum impact testing,
21、 care shall be taken that the pendulum arm mass acts through the center of gravity of the hammer and is counter-balanced. 5.1.3 Apparatus C - Steel Ball. See Figure 3. Impact energy: E = m g h J or h Em g m A A = Direction of impact force Figure 3: Apparatus C in Principle 5.2 Interpretation of Resu
22、lts. Not applicable. 5.3 Test Documentation. The results of the measurements shall be presented in a test report. 6 Safety This standard may involve hazardous materials, operations, and equipment. This standard does not propose to address all the safety problems associated with its use. It is the re
23、sponsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 7 Notes 7.1 Glossary. Impact Resistance: The impact resistance to this test method is defined as the resistance of plastic components
24、 to impact stress. 7.2 Acronyms, Abbreviations, and Symbols. Not applicable. 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Impact Resistance to GMW14093, Apparatus X, Code Y, Z. Where: X = Test apparatus A, B, C or All (where “All” means either app
25、aratus A, B or C is acceptable) per 3.2. Y = Code 1, 2, or 3 per 4.2 (if Code 1, time and temperature must be defined. Example: Code 1 (24 h at 110 C). Z = Requirement in Joules. Example: Impact Resistance to GMW14093, Apparatus A, Code 3, minimum 5 J. Impact Resistance Designation. GMW14093 Test Me
26、thod. Apparatus A Test Apparatus A to 3.2.1. Code 3 Test condition 3 to 4.2.3. Minimum 5 Joule Requirement. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINE
27、ERING STANDARDS GMW14093 Copyright 2013 General Motors Company All Rights Reserved June 2013 Page 4 of 4 9 Release and Revisions This standard was originated in February 2005. It was first approved by the Global Plastics Team in April 2005. It was first published in April 2005. Issue Publication Dat
28、e Description (Organization) 1 APR 2005 Initial publication. 2 JUN 2010 Five year review, converted to new global template. (Global Plastics Team) 3 JUL 2010 Examples added to Section 8. (Global Plastics Team) 4 OCT 2010 Corrected reference numbers in section 8. (Global Plastics Team) 5 JAN 2011 Sim
29、plified callout nomen-clature. (Global Plastics Team) 6 JUN 2013 Corrected typo on impact hammer radius in paragraph 3.2.2. (Plastics Global Subsystem Leadership Team) Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
