1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW16381 Light Weight Reinforced Thermoplastic Underbody Panel Materials Copyright 2012 General Motors Company All Rights Reserved January 2012 Originating Department: North American Engineering Standards Page 1 of 5 1 Scope This standard descr
2、ibes the requirements for Light Weight Reinforced Thermoplastic (LWRT) materials used to make panels that are attached to the underside of the vehicle and used to improve the aerodynamics of the vehicle. 1.1 Material Description. The material shall be supplied in sheet form with a thickness of 4 to
3、6 mm. The sheet is expandable upon heating and formed to final shape in a compression mold. The material shall be suitable for use in exterior underbody vehicle environments. 1.2 Symbols. Not applicable. 1.3 Typical Applications. Components made from this material are used to close off open areas on
4、 the underside of the vehicle. They are intended to provide improved aerodynamic performance of the vehicle. The material can be attached to body and frame components with standard mechanical fasteners such as push pins, threaded fasteners, etc. 1.4 Remarks. Acoustic grade material shall be designat
5、ed as GMW16381 Type A. 1.5 Limitations on Usage. The materials described in this specification are designed for use in applications where the component will not exceed temperatures of 120 C. Above this temperature additional insulators or reflectors can be applied and shall be tested in vehicle. 2 R
6、eferences Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ISO 178 ISO 1183 ISO 6603-2 ISO 527 ISO 4577 ISO 9053 ISO 1172 ISO 5084 ISO 17025 2.2 GM Standards/Specifications. GMW3059 GMW3221 GMW14124 GMW15725 GMW3182 GMW14093 G
7、MW14700 2.3 Additional References. GM Materials File or MATSPC TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requirements 3.1 Requirements on Test Specimens. All test specimens shall be conditioned to GMW3221, Code A, unless the test procedure, or GM Engineering, indicates
8、that standard conditioning is not required. 3.1.1 Test Data. The supplier is responsible for all testing required by this specification. Lab testing is to be performed by a laboratory that conforms to ISO 17025 and is acceptable to the customer (GM). Test reports must conform to ISO 17025 Test Repor
9、ts and Calibration Certificates. 3.1.2 Data Reporting. If all individual readings of a specific test meet or exceed the specified requirements, report the average. Unless otherwise stated, any individual reading outside the specified limit does not meet the requirement. Report all individual test re
10、sults that do not meet the requirements. Any additional test requirements shall be provided to GM upon request (i.e., high speed stress strain and compression curves for use in Computer Aided Engineering analysis. Copyright General Motors Company Provided by IHS under license with General Motors Com
11、panyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16381 Copyright 2012 General Motors Company All Rights Reserved January 2012 Page 2 of 5 3.1.3 Samples for Test. All testing shall be conducted on production representative fo
12、rmed parts when possible. Flat panels can be used when required for specific tests and must be representative of production materials and process. All tests on flat panels must be approved in advance by GM Engineering. 3.1.4 The material used for producing the part shall be tested to the requirement
13、s listed in Table 1 and approved in the GM Materials File (MATSPC). Each increment of areal weight of the material shall be tested to the requirements of Table 1. 3.1.5 The production part shall meet the performance requirements as listed in Table 2 or as indicated on engineering drawings. 3.2 Areal
14、 Weight. Use the procedure described in GMW3182. Test three (3) specimens minimum and report the average in grams per meter squared (g/m2). Specimens shall be taken from significant areas of the part, especially deep draw or high strain areas. Acceptable production tolerances shall be 10%. Any devia
15、tion must be agreed to by GM Engineering. Refer to the part drawing for weight specifications. 3.3 Thickness. For fibrous materials use the procedure described in ISO 5084. For solid materials use calipers, micrometers or similar measurement tools. Thickness measurements shall be made from designate
16、d areas of the part as shown on the drawing or as defined by GM Engineering. Report the average of three (3) measurements taken from the defined areas. Report the values in millimeters to the nearest 0.1 mm. 3.4 Environmental Cycle. Test an entire part in “vehicle position” mounted in a rack or fixt
17、ure. Test the part to GMW14124 Cycle F, seven (7) cycles. The part shall exhibit no objectionable degradation after the test such as; wrinkling, distortion, delaminating, expansion, shrinkage or other change that will interfere with normal function. 3.5 Heat Aging. Test an entire part in “vehicle po
18、sition” mounted in a rack or fixture in an oven at 120 C for 400 h. The part shall exhibit no objectionable degradation after the test such as; wrinkling, distortion, delaminating, expansion, shrinkage or other changes that will interfere with normal function. 3.6 Impact Resistance. Perform impact t
19、esting using GMW14093 apparatus B or C codes 1 thru 3. Impact a minimum of three points on the part. Impact zones shall include the leading edge of the part and other significant impact susceptible areas or areas as defined by GM Engineering. The impact energy shall be 10 J. Impact testing shall als
20、o be conducted at -30 C, with an impact energy of 5 J. After completion of the test the component shall show no breakage, or cracks or other defects that will interfere with normal function. 3.7 Impact Resistance (Gravelometer). Use the procedure described in GMW14700 Method B. Specimens shall be ta
21、ken from significant stone impact areas of the part. Specimens shall be subjected to 100 kg of gravel impingement at 90 Impact angle, following the conditions listed below: As received = after 16 h at 23 C, 50% Relative Humidity (RH) Following 3.2.4 Heat Age The part shall exhibit no objectionable d
22、egradation after the test such as; wrinkling, distortion, delamination, shrinkage, folding, cracking or other changes that will interfere with normal function. 3.8 Water and Splash Resistance. Weigh a production part. Completely immerse the part in water for 1 hr. Remove from the water and let the p
23、art sit in vehicle position for 24 h. Reweigh the part. The part weight shall not have increased more than10% from the original dry weight. 3.9 Laminate Peel Strength. For sandwich or laminated constructions, all layers must meet the minimum peel strength of 750 N/m with cohesive failure of the core
24、. Breaks in the laminate skin are acceptable provided the load at break is 750 N/m minimum. Run the peel tests of the laminated face skins or films at an angle of 90 on a power driven machine with a constant rate of 300 mm/minute jaw separation. Report results for regions of the part designated by G
25、M Engineering. Run the peel test as received, following 3.2.3 Environmental Cycle, 3.2.4 Heat Aging, and 3.2.6 Impact Resistance. Test a minimum of three (3) specimens for each condition. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo repro
26、duction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16381 Copyright 2012 General Motors Company All Rights Reserved January 2012 Page 3 of 5 Table 1: Material Requirements (All Tests Performed on Samples 4 mm Thick) Property Test Method Requirement Fibe
27、r Reinforcement, percent (%) ISO 1172 2% absolute Specific Gravity (s.g.) ISO 1183 Report Areal Weight. gram per meter squared (g/m2) GMW3182 Target Value 1400 gm/m2 Flexural Modulus ISO 178 Method 1 a. As received b. Following Thermal Test 3000 x (s.g.) MPa minimum Tensile Strength at Break ISO 527
28、 a. As received b. Following Thermal Test 50 x (s.g.) MPa minimum High Speed Instrumented Impact ISO 6603-2 Speed of testing, 2.2 m/s a. At +22 C b. At -30 C Energy to maximum Load/Total Energy 3.0 J minimum/5.0 J minimum 3.0 J minimum/5.0 J minimum Thermal Oxidative Stability ISO 4577 150 C for 400
29、 h No loss in properties Chemical Resistance GMW15725 Resistance to fluids No change Acoustic Permeability Note 1 ISO 9053, Pressure shall be 500 Pa and orifice size of 100 mm2 Flow resistivity of 1500 500 mks RAYLS. Note 1: For acoustic grade material only. Table 2: Part Performance Requirements Te
30、st Test Method Requirement 3.2 Areal Weight. gram per meter squared (g/m2) GMW3182 10% of Nominal 3.3 Thickness. millimeter (mm) ISO 5084 0.2 mm of drawing dimension 3.4 Environmental Cycle GMW14124 Cycle F No change 3.5 Heat Aging 120 C for 400 h No change 3.6 Impact Resistance GMW14093 a. As recei
31、ved b. Tested at -30 C No breakage or cracks 10 J energy input 5 J energy input 3.7 Stone Abrasion Resistance at 23 C GMW14700 100 kg (cycles) a. As received b. Following Heat Age 3.2.4 No cracking, blistering, delamination 3.8 Water and Splash Resistance 1 h water immersion 10% maximum weight gain
32、after 24 h 3.9 Laminate Peel Strength. Newton per meter (N/m) 90 Peel at 300 mm/minute a. As Received b. Following Environmental Cycle 3.2.3 c. Following Heat Aging 3.2.4 d. Following Stone Abrasion Resistance 3.2.6 750 N/m minimum Copyright General Motors Company Provided by IHS under license with
33、General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16381 Copyright 2012 General Motors Company All Rights Reserved January 2012 Page 4 of 5 4 Manufacturing Process 4.1 Manufacturers Identification. Not applic
34、able. 4.2 Alignment. Not applicable. 4.3 Quality Control Monitoring. All quality control processing guidelines provided by the material source must be followed by the molder. The molder must also show process control in all areas associated with this specification and document process parameters in
35、the appropriate document or control plan. All deviations to material source guidelines must be documented in drawing/math notes by engineering work order sign off by Body Structures Lowers Global Subsystem Leadership Team and Program Materials Engineer. All materials require approval from Materials
36、Engineering. 4.4 Part Performance/Processability. All materials covered by this specification are subject to part performance testing through part validation. 5 Rules and Regulations 5.1 Legal Regulations. All materials must satisfy applicable laws, rules, regulations and recommendations valid in th
37、e country of usage. 5.2 Language. In the event of conflict between the English and domestic language, the English language shall take precedence. 5.3 Inspection and Rejection. Samples of components or materials released to a GM material specification shall be tested for conformity with the requireme
38、nts of this material specification and approved by the responsible Engineering department prior to commencement of delivery of bulk supplies. A new approval must be received for any changes, e.g., properties, manufacturing process, location of manufacture, etc. If not otherwise agreed, all testing a
39、nd documentation normally required for initial release must be completed. It is the responsibility of the supplier to inform the customer in a timely manner, without solicitation, and to include documentation of all modifications of materials and/or processes and to apply for a new release. If not o
40、therwise agreed, all release tests shall be repeated and documented by the supplier prior to commencement of delivery of non-conforming bulk supplies. In individual cases, a shorter test can be agreed to between the responsible Engineering department and the supplier. 5.4 Initial Source Approval. No
41、 shipments shall be made by any supplier until representative initial production samples have been approved by the appropriate Materials Engineering department(s) as meeting the requirements of this specification. 5.5 Material Safety Data Sheets/Safety Data Sheets (MSDS/SDS). For new product submiss
42、ions, or when a change in chemical composition of an existing product has occurred, a complete copy of the Material Safety Data Sheet/Safety Data Sheet must be submitted in compliance with the Globally Harmonized System of Classification and Labeling of Chemicals (GHS) requirements or other country-
43、specific MSDS/SDS requirements. In addition, product MSDS/SDS submissions must be in compliance with specific country General Motors TMC003 Material Safety Data Sheet/Safety Data Sheet guidance documents where available. 5.6 All materials supplied to this standard must comply with the requirements o
44、f GMW3059, Restricted and Reportable Substances for Parts. 6 Approved Sources Engineering qualifications of an approved source are required for this standard. Only sources listed in the GM Materials File, MATSPC, under this standard number have been qualified by Engineering as meeting the requiremen
45、ts of this standard. For other GM locations, the responsible Engineering group should be contacted to obtain the approved source in that individual country. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted
46、 without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16381 Copyright 2012 General Motors Company All Rights Reserved January 2012 Page 5 of 5 7 Notes 7.1 Glossary. MATSPC: GM approved materials database. Global repository of GM approved materials for corresponding GM Engineering Stand
47、ards. 7.2 Acronyms, Abbreviations, and Symbols. GHS Globally Harmonized System GSSLT Global Subsystem Leadership Team LWRT Light Weight Reinforced Thermoplastic MSDS Material Safety Data Sheet RH Relative Humidity SDS Safety Data Sheet s.g. Specific Gravity 8 Coding System This standard shall be ref
48、erenced in other documents, drawings, etc., as follows: Material per GMW16381 9 Release and Revisions This standard was originated in May 2010. It was first approved by the Global Composites Team in December 2011. It was first published in January 2012. Issue Publication Date Description (Organization) 1 JAN 2012 Initial publication. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
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