SAMPE Journal - January/February 2023 - 10
FEATURE
AUTOMATED EVALUATION METHOD
An Automated Evaluation Method of Tool Surface
Condition in Composites Manufacturing Using
Machine Learning and Sparse Sensing
Caleb Schoenholz1, Shuangshan Li1,2
1
, Kyle Bainbridge1
, Vy Huynh1, Alex Gray1
, Xu Chen3, Navid Zobeiry1
Materials Science & Engineering Department, University of Washington, Seattle, WA
2
Applied Mathematics Department, University of Washington, Seattle, WA
3
Mechanical Engineering Department, University of Washington, Seattle, WA
Email: Navidz@uw.edu
ABSTRACT
The interaction between a tool and part during composites manufacturing may significantly contribute to the
formation of residual stresses and process-induced deformations (PIDs). Aerospace manufacturers typically
treat tool surfaces with release coatings to minimize tool-part interaction. During autoclave processing,
tool surfaces undergo physicochemical changes due to the aging of release coating and cure-induced
contamination. The aging of release coating and surface contamination may strongly influence the level of
tool-part interaction and PIDs in subsequent processing cycles. Production tools are frequently retreated
with fresh layers of release coating and intermittently cleaned to mitigate aging and contamination effects.
However, release coating reapplications and tool surface cleaning are often performed based on know-how in
production environments, leading to cost-deficient tool preparation schedules and in some cases, excessive
PIDs. This paper presents an automated method to evaluate the surface condition of large production tools for
composites manufacturing using machine learning (ML) and sparse sensing. ML methods are used in conjunction
with multiple measurement techniques for fast global digital mapping and sparse local physicochemical
evaluation of a tool surface. The technology can be integrated into a robotic platform for automatic inspection
of large tools to improve production efficiency and potentially mitigate PIDs in composites manufacturing.
10 | SAMPE JOURNAL | JANUARY FEBRUARY 2023
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SAMPE Journal - January/February 2023
Table of Contents for the Digital Edition of SAMPE Journal - January/February 2023
Contents
SAMPE Journal - January/February 2023 - Cover1
SAMPE Journal - January/February 2023 - Cover2
SAMPE Journal - January/February 2023 - Contents
SAMPE Journal - January/February 2023 - 2
SAMPE Journal - January/February 2023 - 3
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SAMPE Journal - January/February 2023 - Cover3
SAMPE Journal - January/February 2023 - Cover4
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