DOT/FAA/AR- 02/109 Guidelines and Recommended Criteria for the Development of a Material Specification For Carbon Fiber/Epoxy Unidirectional Prepregs Overview.

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Presentation transcript:

DOT/FAA/AR- 02/109 Guidelines and Recommended Criteria for the Development of a Material Specification For Carbon Fiber/Epoxy Unidirectional Prepregs Overview Presented by Stephen Ward, SW Composites FAA Workshop on Key Characteristics for Advanced Material Control Chicago, IL September 16, 2003

9/16/2003FAA Workshop on Composite Material Control2 Document Development Team –Will McCarvillCurtis Davies –Stephen WardLarry Ilcewicz –Gregg BoguckiRichard Moulton –John TomblinDavid Swartz Time Line –First Draft:April - July 2002 –FAA Workshop:August 2002 –Final Draft:October 2002 –Release by FAA:April 2003

9/16/2003FAA Workshop on Composite Material Control3 Document Outline 1.0Introduction 2.0Development of Material Controls 3.0Scope 4.0Applicable Documents 5.0Technical Requirements 5.1Definitions 5.2Material Requirements 5.3Prepreg Ingredient and Process Requirements 5.4Uncured Prepreg Requirements 5.5Cured Prepreg Property Requirements 5.6Material Characterization 6.0Quality Assurance 6.1Changes to Qualified Materials 6.2Supplier Site Qualification 6.3Statistical Process Control 6.4Reduced Testing 6.5Product Certification 6.6Material Test Methods 6.7Test Panel Fabrication 7.0Packaging and Shipping 8.0Acknowledgement 9.0Rejection 10.0Notes

9/16/2003FAA Workshop on Composite Material Control4 Guidelines Limited to Hot Melt Uni-tape Easiest product form to tackle first. Familiar industry standard for manufacture, design, and use. Addresses common themes such as resin mixing, combining resin with fiber, and testing.

9/16/2003FAA Workshop on Composite Material Control5 Shared Databases Document promotes approach for shared material property databases The material supplier will benefit by: –Not conducting multiple qualifications of the same material to various user specifications. –Manufacturing fewer materials, gaining better efficiency. The user will benefit by: –Simpler, easier, cheaper qualifications and certifications. –Better understood, more consistent materials.

9/16/2003FAA Workshop on Composite Material Control6 Technical Requirements - Highlights Detailed definitions for “material batch” Strongly recommends establishment of PCD for prepreg –Determine process parameter targets and ranges by engineering trials Each specification designation to include: –Single resin formulation, single specific fiber –Unique “slash sheet” for industry specification Recommends characterization of resin cure kinetics Recommends demonstration that properties are valid over entire prepreg process window (time/temp extremes) Recommends tracking storage/out-life from date of manufacture

9/16/2003FAA Workshop on Composite Material Control7 Technical Requirements - Highlights Recommends prepreg manufacturer establish baseline cure cycle for initial database Recommends minimum set of uncured and cured laminate properties –Initial characterization (qualification) –Establish specification –Material allowables –Database for batch acceptance and equivalency evaluations Recommends additional tests for expanded database –Extent to depend on end-user requirements

9/16/2003FAA Workshop on Composite Material Control8 Technical Requirements – Recommended Characterization Test Matrices Neat resin properties Carbon fiber properties Uncured prepreg properties Cured laminate physical properties Cured laminate mechanical properties –Minimum set Unidirectional and cross-ply strength and modulus –Additional for general applications Open hole tension, compression strength

9/16/2003FAA Workshop on Composite Material Control9 Technical Requirements – Recommended Expanded Database Tests Quasi, hard, soft layups: –Unnotched tension and compression –Open hole tension and compression –Filled hole tension and compression –Bearing Interlaminar shear Sandwich flexure (unnotched, open hole, impacted) In-plane shear (solvent sensitivities) Fracture toughness Laminate compression after impact Open hole fatigue

9/16/2003FAA Workshop on Composite Material Control10 Technical Requirements - Qualification Initial material characterization –Minimum of 3 prepreg batches (3 resin, 2 fiber batches) –Use AGATE developed procedures for establishing acceptance limits and equivalency requirements –Batch acceptance tests: Fiber, resin, volatile contents Flow, HPLC Cured thickness RT [0/90] tension Hot [90/0] compression RT SB shear

9/16/2003FAA Workshop on Composite Material Control11 Technical Requirements – Expanded Batch Testing Recommends expanded batch testing: –Provide robust equivalency database –Ongoing validation of structural properties –Reduce chances for “surprises” for re-qualifications, equivalency demonstrations –Potential for higher allowables –Reduced levels of testing once material is demonstrated to be in control

9/16/2003FAA Workshop on Composite Material Control12 Quality Assurance Requirements - Highlights Recommends SPC for key characteristics and key process parameters –KCs: batch acceptance tests –KPPs: resin mixing and prepreg processing parameters that have a significant influence on the KCs Determine prior to qualification Document in PCD –Data should be collected, plotted, analyzed and acted upon

9/16/2003FAA Workshop on Composite Material Control13 Quality Assurance Requirements - Highlights Changes to qualified materials –Expansion of AGATE equivalency procedures –Defines 5 levels of change Based on FAA draft composite material TSO Recommends types of changes that apply to each level

9/16/2003FAA Workshop on Composite Material Control14 Changes in Final Version Major changes based on FAA workshop input: –Aligned document to SAE specification format –Revised batch definitions –Simplified and removed FAA policy wording from material qualification process sections (2.4, 2.5) –Clarified recommendations on demonstrating capability of prepreg for cure process extremes –Separated test conditions and methods in tables –Added test method recommendations –Clarified expanded batch testing recommendations –Added Glossary