1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW16563 Structural Low-Density, Carbon/Glass Hybrid Sheet Molding Composite Copyright 2011 General Motors Company All Rights Reserved October 2011 Originating Department: North American Engineering Standards Page 1 of 5 1 Scope 1.1 Material De
2、scription. This specification covers the properties of a polyester low density Sheet Molding Compound (SMC), reinforced with 15% carbon fiber and 30% glass fibers, all are randomly oriented and 25 mm in length. The cured material shall have a density of 1.4 g/cm3 maximum. 1.2 Symbols. Not applicable
3、. 1.3 Typical Applications. Typical applications include the following: Structural Body Panels. 1.4 Remarks. The material must meet the bondability requirements of GMW15921. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specif
4、ications. ISO 62 ISO 1172 ISO 178 ISO 1183 ISO 180/U ISO 2577 ISO 527 ISO 6603-2 ISO 527-1/2 ISO 11359-2 2.2 GM Standards/Specifications. GMW3059 GMW15921 GMW3221 2.3 Additional References. TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requirements 3.1 Test Procedures. Test
5、s shall be conducted using the latest issue of the test methods indicated. Suitable precautions should be taken to ensure that applicable safe limits are not exceeded when conducting test procedures, processes, and/or handling the materials required by this specification. 3.1.1 Properties shall be d
6、etermined using test specimens router cut from SMC test plaques. Plaques shall be molded as shown in Appendix A, Figure A1. Plaques shall be molded using the mold temperatures, mold pressure and cure cycle that will be used to mold production parts. Each material vendor shall define these molding co
7、nditions in this certifiable data package. The length and width of the test mold, as well as the gate configuration, shall be included in the certification package. Plaques shall be 2.5 mm 0.1 mm thick. Weight variation between plaques shall not exceed 3.0%. 3.1.2 Raw materials used for compounding
8、shall be within their vendor defined shelf life. Plaques shall be molded 7 days maximum after compounding. Plaques shall be uniform in appearance and free from blisters, pregels, knit lines, cracks, and surface contamination. Porosity shall be one pit maximum per 625 mm2. Surfaces shall also be free
9、 of external mold release. (Mold and scrap a minimum of three plaques after using external mold release). 3.1.3 An equal number of specimens shall be cut from both the longitudinal and transverse plaque directions for each mechanical property. The specimens shall be tested and the results averaged.
10、The average value is the material property value. This value is compared to the required value shown in Table 1. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16563 Copyright 2011 General Motors Company All Rig
11、hts Reserved October 2011 Page 2 of 5 3.1.4 Tests shall be conducted 40 h minimum after molding and immediately following a conditioning period of 24 h minimum at 22 C 3 C and 50 5% relative humidity (RH) unless otherwise specified. All testing shall be done on unannealed samples. 3.1.5. Requirement
12、s on Test Specimens. Reference GMW3221, Code A. 3.2 Compound Properties. 3.2.1 Compound Properties (Natural, Gray and Black). See Table 1. Table 1: Compound Properties Properties Test Values Test Methods Glass Fiber Reinforcement 28 to 35% ISO 1172 Carbon Fiber Reinforcement 13 to 17% ISO 1172 Moist
13、ure Absorption 0.5% maximum ISO 62 Method 1 Density 1.4 g/cm3 maximum ISO 1183 Method A Flexural Modulus At +22 C 0.5 mm deflection 2.5 mm deflection At 150 C 0.5 mm deflection 2.5 mm deflection 9400 MPa minimum 8000 MPa minimum Report Report ISO 178 Method 1. Three point loading. 1.3 mm/minute, 70
14、mm length 10 mm wide, thickness 2.5 mm to 3.0 mm, 60 mm span, secant calculations at 0.5 mm and 2.5 mm deflection. Flexural Strength 140 MPa minimum ISO 178 Method 1 Tensile Strength at Break 50 MPa minimum ISO 527 Tensile Modulus 12 000 MPa minimum ISO 527 Multiaxial Instrumented Impact Maximum Loa
15、d Deflection to Maximum Load Energy to Maximum Load Total Energy 680 N minimum 6 mm maximum 1.8 J minimum 2.3 J minimum ISO 6603-2/40/20/c/2.2 Poissons Ratio Report ISO 527-1/2 Coefficient of Linear Thermal Expansion (CLTE) Report ISO 11359-2, Mean secant value over the temperature range -30 C to +1
16、50 C Unnotched Izod Impact Report kJ/m2 ISO 180/U Mold Shrinkage Note 1 +0.0003 0.013% ISO 2577 Note 1: This property assures reproducible mold shrinkage, but does not indicate the shrinkage to use to cut tools for production parts. 3.2.2 Constituent Materials. Individual specifications for the mate
17、rials which constitute the SMC molding compound shall be established by the molder. Incoming materials shall be approved to those specifications by the molders laboratory before release for production. Test results shall be maintained by the molder and be available for GM review. 3.3 Suggested Compo
18、und Verification. Inherent compound properties and test procedures that may be used to identify this material are as follows. The test value and test procedure requirements are identical to those listed in 3.2.1. Provided by IHSNot for ResaleNo reproduction or networking permitted without license fr
19、om IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16563 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 3 of 5 Filler Content Glass Fiber Content Infrared Characterization Scan Density 3.4 Identification. The molding compound shall be identified by the specification code,
20、the manufacturers identification code and lot number, along with any additional vehicle group and component division requirements. 4 Manufacturing Process Not applicable. 5 Rules and Regulations 5.1 Legal Regulations. All materials must satisfy applicable laws, rules, regulations and recommendations
21、 valid in the 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 t
22、he requirements 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, a
23、ll testing and 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 relea
24、se. If not otherwise 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
25、Approval. No 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 pro
26、duct submissions, 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 ot
27、her country-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 re
28、quirements of 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 (i.e., GM MATSPC) under this standard number have been qualified by Engineering as m
29、eeting the requirements of this standard. 7 Notes 7.1 Glossary. MATSPC: Global repository of GM approved materials for corresponding GM Engineering Standards. 7.2 Acronyms, Abbreviations, and Symbols. CLTE Coefficient of Linear Thermal Expansion GHS Globally Harmonized System Provided by IHSNot for
30、ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16563 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 4 of 5 MSDS Material Safety Data Sheet RH Relative Humidity SDS Safety Data Sheet SMC Sheet Molding Compo
31、und 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Material per GMW16563 9 Release and Revisions This standard was originated in March 2011. It was first approved by the Composites Global Subsystem Leadership Team in October 2011. It was first publi
32、shed in October 2011. Issue Publication Date Description (Organization) 1 OCT 2011 Initial publication. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16563 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 5 of 5 Appendix A Figure A1: Plaque Molding Configuration Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
