40207_appb - SPECIFICATIONS AND STANDARDS FOR POLYMER...

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SPECIFICATIONS AND STANDARDS FOR POLYMER COMPOSITES APPENDIX B Frank T. Traceski B.l USES OF SPECIFICATIONS STANDARDS AND Material specifications and engineering stan- dards for advanced composite materials have a very broad applicability across the entire spectrum of defense and commercial applica- tions. From basic research, through engineering and manufacturing development, in produc- tion, and for maintenance and field repair, material and process specifications establish requirements and procedures. In research and development, testing stan- dards are used for material characterization to determine physical, chemical, mechanical, ther- mal and electrical properties. In manufacturing development, material specifications are used to establish material quality and processability requirements. In production, the material pro- ducer uses test standards and material specifications for statistical process control (SPC) to ensure batch-to-batch consistency. Material testing standards are used exten- sively in design engineering to determine material design allowables (i.e. strength and stiffness limits beyond which catastrophic fail- ure occurs) at various temperatures and environments. Material testing to standards enables one to quantify material performance Handbook of Composites. Edited by S.T. Peters. Published in 1998 by Chapman &Hall, London. ISBN 0 412 54020 7 limits. A list of typical composite material qualification tests is provided in Table B.l. These examples are representative of the mate- rial properties which are determined in a typical material qualification program in accordance with various test standards. A concurrent engineering approach to com- posites engineering requires that material selection (as part of the design process) be inte- grally linked with engineering and manufacturing process development. In com- posite manufacturing development, material process specifications are defined for a given composite material and manufacturing process. Once optimized, process specifications reduce manufacturing risk and enhance producibility. Another aspect of composites manufactur- ing is the nondestructive testing and inspection (NDTI) of composite structures to verify structural integrity during production. Ultrasonic inspection, infrared thermography, and a host of other NDTI methods are employed to locate voids, delaminations, cracks, and other types of structural defects. Standards are also employed here to define NDTI procedures and acceptance criteria. In summary, engineering test standards and material and process specifications are employed extensively in composites research, development and production. Appendix B identifies specific material specifications and test standards for polymer composites and the
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1060 Specifications and standards for polymer composites Table B.1 Typical composite material qualification tests Physical Mechanical Resin content Resin areal weight Resin flow Glass transition temperature Rheological dynamic spectroscopy (RDS) Gel time Volatiles content Fiber density
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This note was uploaded on 03/16/2010 for the course MECHANICAL ME765401 taught by Professor Prof.sulis during the Spring '10 term at Institut Teknologi Bandung.

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40207_appb - SPECIFICATIONS AND STANDARDS FOR POLYMER...

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