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1、MG ROVER GROUP ENGINEERING STANDARDS Issue No: MGR ES: TITLE: Page 1 of 6 Date: - Printed Copy is Uncontrolled - Check Issue is Current - 12 Accelerated Testing of Non-Metallic Components whenever possible production parts such as screws, bezels, housings, sheet metal stamping etc. shall be employed
2、. 4.1.2 Condition the specimens at 23C 2C and 65% 5% RH for 24 hours. 4.1.3 Subject components to 80C for 2 hours to simulate the maximum environment liable to be encountered during on - wheels paint repair. 4.1.4 Condition components at 23C 2C and 65% 5% RH for 2 hours prior to subjecting them to t
3、hree cycles of the environmental test schedule defined in Table 1. 4.2 UV Exposure When specified by a U suffix (see clause 6.1) components shall be assessed for light fastness. This shall be performed on samples currently undergoing testing and should be carried out at the end of Cycle 1 and before
4、 the start of Cycle 2. Light fastness shall be assessed in accordance with clauses 4.3 to 4.5. For those components that are too large to fit into the UV equipment (see clause 2.4) fresh samples of their constituent materials shall be tested separately. Assessments should be made on the materials st
5、ability to UV light from tests performed. MG ROVER GROUP ENGINEERING STANDARDS MGR ES: Page 3 of 6 Date: Issue No: TITLE: - Printed Copy is Uncontrolled - Check Issue is Current - Accelerated Testing of Non-Metallic Components & Materials 12 30.EE.102 March 2004 Table 1 Cycle 1 (hours) Cycle 2 (hour
6、s) Cycle 3 (hours) Pre - Conditioning See Clauses 4.1.2 4.1.4 - - Cold Temperature Cycle (-40C) 22 22 22 Room Temperature (min) 2 2 2 In Service Temperature (C) (see Table 2) (see clauses 5.1, 6.1 and 7.1). 22 22 22 Room Temperature (min) 2 2 2 Humidity Cycle (See Clause 2.3) 22 22 22 Room Temperatu
7、re See Clause 7.1 for minimum assessment hours UV Exposure (where specified, see Section 4.2) 72 - - Note: When UV exposure has been completed no further exposure is required in any of the subsequent test cycles. (i.e. One 72 hour UV exposure only during this test programme) 4.3 Visible exterior com
8、ponents shall be tested and assessed for colour fastness to light in accordance with MGR ES.30.AA.101. 4.4 Interior components located directly below glass (i.e. requiring testing to both MGR ES.30.EE.102 and MGR ES.30.EE.105) shall be tested and assessed for colour fastness to light in accordance w
9、ith MGR ES.30.CF.005. 4.5 Interior components not located directly under glass shall be tested and assessed for colour fastness in accordance with MGR ES.30.AA.101: Method 2 except that the UV radiation shall be further filtered by a sheet of clear toughened window glass as fitted to the production
10、vehicle, and the exposure period terminated after 72 hours. 5 In-Service Temperature & UV Exposure 5.1 The temperature which a component/material is required to withstand in service depends on vehicle design and component location. This shall be determined by MG Rover Group Materials Engineering and
11、 defined on the engineering drawing in accordance with clause 6.1. In-service temperatures are shown in Appendix 1, Table 2. 5.2 UV exposure tests shall be carried out on those components/materials normally exposed to light and shall be specified, when required, by means of a U suffix shown in claus
12、e 6.1. MG ROVER GROUP ENGINEERING STANDARDS MGR ES: Page 4 of 6 Date: Issue No: TITLE: - Printed Copy is Uncontrolled - Check Issue is Current - Accelerated Testing of Non-Metallic Components & Materials 12 30.EE.102 March 2004 6 Application Of Standard To Engineering Drawings 6.1 The drawing for th
13、e component shall be endorsed with the reference for this Standard followed by the in-service temperature and, if required, a U suffix. For example MGR ES.30.EE.102/90U if the component is normally exposed to light and 90C is the maximum temperature to which will be subjected in service. 6.2 The Eng
14、ineering drawing shall identify any allowable dimensional or other changes. 7 Requirements 7.1 Temperature and Humidity There shall be no evidence of distortion, cracking, crazing, colour change or dimensional change on the component/material after stoving and after each test cycle unless otherwise
15、stated. The criteria for acceptance of changes in optical properties subject to legal requirements shall be as defined in the appropriate Standard. 7.2 UV Exposure There shall be no change of shade worse than grey scale 4 (min) or any other deleterious effect such as cracking, chalking etc. Any off-
16、tone fade will also be cause for rejection. MG ROVER GROUP ENGINEERING STANDARDS MGR ES: Page 5 of 6 Date: Issue No: TITLE: - Printed Copy is Uncontrolled - Check Issue is Current - Accelerated Testing of Non-Metallic Components & Materials 12 30.EE.102 March 2004 Appendix 1 - In-Service Test Temper
17、atures for Passenger Vehicles Table 2 Location Component In-Service Test Temperature ( C) Vehicle Interior Fascia and Console Facia Panel 105 Instrument Panel 105 Steering Wheel 105 Upper Centre Console 95 Gearbox Console 85 Gearbox Lever Gaiter 85 Vertical Trim A, B, C, D, E Post Trim 105 Waist Rai
18、l Finishers 95 Door Casings Upper 95 Door Casing Middle/Lower 85 Boot Trim - Saloon 75 Boot Trim 5 door & Tourer 85 Roof and Floor Trim Sun Visor 105 Rear View Mirror 105 Rear Parcel Tray and Associated Parts 105 Loadspace Covers and Associated Parts 95 Carpets 85 Headliners 85 Boot Trim 85 Seating
19、Seat Squab and Associated Parts 105 Seat Base and Associated Parts 85 Vehicle Exterior Horizontal Surfaces 90 Vertical Surfaces 75 Underfloor Components (not near heat source) 50 Engine Bay General 100 High Temperature 140 MG ROVER GROUP ENGINEERING STANDARDS MGR ES: Page 6 of 6 Date: Issue No: TITL
20、E: - Printed Copy is Uncontrolled - Check Issue is Current - Accelerated Testing of Non-Metallic Components & Materials 12 30.EE.102 March 2004 Appendix 2 - Environmental Test Schedule COMPONENT NAME:_ PART NUMBER:_ COLOUR:_ JOB NUMBER:_ IN-SERVICE TEST TEMPERATURE (C):_ All components to complete t
21、hree environmental cycles. Cycle Test Description 1 2 3 Observations Condition Samples at 23C & 65% RH for 24 hours Condition Samples at 80C for 2 hrs Condition Samples at 23C & 65% RH for 2 hours 22 hours at -40C 2 hours (minimum) at room temperature 22 hours at in-service temperature 2 hours (minimum) at room temperature 22 hours humidity (to MGR ES 30 CT 900) 2 hours (minimum) at room temperature 72 hours UV* 2 hours (minimum) at room temperature *UV light resistance only where specified