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Material Qualification and Equivalency for Polymer Matrix Composite Material Systems; Updated Procedure

This document presents the detailed background information and engineering practices that
provides the basis for a qualification methodology to help ensure the control of repeatable base
material properties and processes that are applied to both primary and secondary structures for
aircraft products using composite materials. This document includes recommendations for the
original qualification as well as procedures to statistically establish equivalence to the original
data set. The document describes in detail the procedures to generate statistically based design
allowables for both A- and B-basis applications. Specific test matrices are presented that
produce lamina-level composite material properties for various loading modes and
environmental conditions for aircraft applications not exceeding 200°F. This document only
covers the initial material qualification at the lamina level and does not include procedures for
laminate or higher-level building block tests. The general methodology, however, is applicable
to a broader usage.

This document presents the detailed background information and engineering practices that
provides the basis for a qualification methodology to help ensure the control of repeatable base
composite material properties and processes for use in aircraft products. These engineering
procedures apply to the original material qualification and provide a benchmark for subsequent
material and process control. Over time, changes to the material, process, tooling, and facility
require a review, and it may be required that some (or all) of these tests be repeated.

This methodology includes recommendations for an original qualification as well as procedures
to statistically establish equivalence to the original data set. This report describes in detail the
procedures to generate statistically based design allowables for both A- and B-basis applications.
Specific test matrices are presented that produce lamina-level composite material properties for
various loading modes and environmental conditions. This document only covers the initial
material qualification at the lamina level and does not include procedures for laminate or higher-
level building block tests. Specifically, it covers qualification methodology for no—bleed prepreg
systems manufactured using vacuum bagging techniques (autoclave or oven cure) only.
However, the methodology described is this plan is applicable to broader usage.