1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW16564 Structural Low-Density, Carbon Fiber Liquid Molded Composite Copyright 2011 General Motors Company All Rights Reserved October 2011 Originating Department: North American Engineering Standards Page 1 of 4 1 Scope 1.1 Material Descripti
2、on. This specification covers the properties of a compression molded, hand poured Liquid Molded Composite (LMC) polyester incorporating nano-type fillers and using a directed carbon fiber preform. The cured material shall have a density of 1.4 g/cm3 maximum and 30% random oriented chopped carbon fib
3、ers about 25 mm long. 1.2 Symbols. Not applicable. 1.3 Typical Applications. Typical applications include the following: Structural Reinforcements, non-class A. 1.4 Remarks. The material must meet the bondability requirements of GMW15921. 2 References Note: Only the latest approved standards are app
4、licable unless otherwise specified. 2.1 External Standards/Specifications. 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 do
5、cuments (available at ). 3 Requirements 3.1 Test Procedures. Tests 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 mate
6、rials required by this specification. 3.1.1 Properties shall be determined using test specimens router cut from compression molded LMC test plaques. Plaques shall be molded using the mold temperatures, mold pressure and cure cycle that will be used to mold production parts. Each material vendor shal
7、l define these molding conditions 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 materi
8、als used for compounding shall be within their vendor defined shelf life. 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 of external mold release. (Mold
9、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. The average value is the material
10、 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 GMW16564 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 2
11、of 4 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. Requirements on Test Specimens. Reference GM
12、W3221 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 Carbon Fiber Reinforcement 26 to 34% ISO 1172 Moisture Absorption 1.0% maximum ISO 62 Method 1 Density 1.40 g/cm3 maximum ISO 1183
13、 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 24 900 MPa minimum 6200 MPa minimum Report MPa Report MPa ISO 178 Method 1. Three point loading. 1.3 mm/minute, 70 mm length 10 mm wide, thickness 2.5 mm to 3.0 mm, 60 mm span, secant
14、 calculations at 0.5 mm and 2.5 mm deflection. Flexural Strength 390 MPa minimum ISO 178 Method 1 Tensile Strength at Break 216 MPa minimum ISO 527 Tensile Modulus 24 000 MPa minimum ISO 527 Multiaxial Instrumented Impact Maximum Load Deflection to Maximum Load Energy to Maximum Load Total Energy Re
15、port N Report mm Report J Report J 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 +150 C Unnotched Izod Impact 1200 kJ/m2 minimum ISO 180/U Mold Shrinkage Note 1 +0.0003
16、 0.013% maximum 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 materials which constitute the molding compound shall be established by the
17、 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 Compound Verification. Inherent compound properties and test procedures that may
18、 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 from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16564 Copyright 2011 Gener
19、al Motors Company All Rights Reserved October 2011 Page 3 of 4 Filler Content Carbon Fiber Content Infrared Characterization Scan Density 3.4 Identification. The molding compound shall be identified by the specification code, the manufacturers identification code and lot number, along with any addit
20、ional 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 valid in the country of usage. 5.2 Language. In the event of conflict bet
21、ween 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 requirements of this material specification and approved by the respons
22、ible 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 and documentation normally required for initial release must be
23、 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 otherwise agreed, all release tests shall be repeated and docum
24、ented 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 shipments shall be made by any supplier until representative
25、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 submissions, or when a change in chemical composition of an existing
26、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-specific MSDS/SDS requirements. In addition, product MSDS/SDS
27、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 of GMW3059, Restricted and Reportable Substances for Parts. 6 A
28、pproved 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 meeting the requirements of this standard. 7 Notes 7.1 Glossary. Not applic
29、able. 7.2 Acronyms, Abbreviations, and Symbols. CLTE Coefficient of Linear Thermal Expansion GHS Globally Harmonized System LMC Liquid Molded Composite Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16564 Copyri
30、ght 2011 General Motors Company All Rights Reserved October 2011 Page 4 of 4 MSDS Material Safety Data Sheet RH Relative Humidity SDS Safety Data Sheet 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Material per GMW16564 9 Release and Revisions This
31、 standard was originated in March 2011. It was first approved by the Composites Global Subsystem Leadership Team in October 2011. It was first published 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-,-,-
