SAMPE Journal - July/August 2016 - 31

Feature Article
Table 1. Qualitative levels for prepreg tack.

lay-up are sensitive to ambient conditions. Material
system susceptibility to ambient temperature
and relative humidity depends on formulation of
the resin system. MTMĀ®45-1 is highly sensitive
to ambient conditions as it increases in tack with
higher temperature and relative humidity. Since
tack level is essential to ply consolidation, it is
important to be able to provide a quick quantitative
assessment prior to fiber placement.

ply may be expected to differ from the rest of the
lay-up. There are two approaches to adhere the
first ply laid by AFP to the tool: 1) using a layer of
prepreg material on the tool surface and 2) tackifier
made from the solvated matrix resin. Tackifier can
be more challenging since insufficient tackifier
levels will lead to poor adherence of the first ply and
too much tackifier can lead to sliding of the tows on
the tool surface.

First Ply Adhesion
AFP relies on the combined tackiness of the
already laid ply and the new ply being placed on the
part. The placement parameters for the first placed

Heat & Compaction Optimization
The primary method Lockheed Martin uses to
optimize process parameters for OoA AFP is the
fiber placement of process control strips. Process

SAMPE Journal, Volume 52, No. 4, July/August 2016

31


http://www.matec.com

Table of Contents for the Digital Edition of SAMPE Journal - July/August 2016

Contents
SAMPE Journal - July/August 2016 - Cover1
SAMPE Journal - July/August 2016 - Cover2
SAMPE Journal - July/August 2016 - Contents
SAMPE Journal - July/August 2016 - 2
SAMPE Journal - July/August 2016 - 3
SAMPE Journal - July/August 2016 - 4
SAMPE Journal - July/August 2016 - 5
SAMPE Journal - July/August 2016 - 6
SAMPE Journal - July/August 2016 - 7
SAMPE Journal - July/August 2016 - 8
SAMPE Journal - July/August 2016 - 9
SAMPE Journal - July/August 2016 - 10
SAMPE Journal - July/August 2016 - 11
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