Troubleshooter Column
Revisiting the double vacuum debulk process
Evolution of the double vacuum debulk (DVD) process over the years continues to advance its “near autoclave quality” for low-void, highly compacted repair patches.
Understanding vacuum bagging layers in production, repair
Recognizing the functions of each layer in a vacuum bag schedule can help users discover what vacuum bag schedules work best for their application.
Read MoreReal-time assessment of thermoset composites curing
The combination of material state management (MSM) software and an encapsulated sample rheometer (ESR) enables real-time cure recipe management or cure model development inside the autoclave.
Read MoreNine factors to consider when designing composites cure tooling
Gary Bond discusses the common pitfalls and compromises when designing good cure tooling and their holistic significance for a robust composite production process.
Read MoreProper application of semi-permanent mold release systems
Performing regular maintenance of the layup tool for successful sealing and release is required to reduce the risk of part adherence.
Read MoreThe importance of resin mixing procedures in the composites shop
What is considered to be common knowledge when storing, handling, weighing, mixing and deploying epoxy resins and adhesives has brought to light the need for tighter control, improved practices.
Read MoreWhy does my composite mold leak under vacuum or applied pressure?
Louis Dorworth of Abaris Training Resources outlines key considerations to make when fabricating quality composite molds to minimize risk of leakage under pressure or vacuum.
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Nondestructive inspection methods available to composites manufacturers
An overview of composite laminate inspection techniques ranging from manual testing methods to more advanced, noncontact options.
Doing the twist: A look at dimensional issues in high-temperature cured laminates
When it’s not the tooling, the root cause of dimensionally inaccurate composite parts often boils down to two things: fiber form(s) used and laminate symmetry.
Read MoreFostering best practices for wet layup procedures
As fabricators continue to manufacture composite tools and parts using an open mold, wet layup process — often with mixed success — it’s important to stress proper preparation, materials, application methods and standardization.
Read MoreTroubleshooting thermal design of composite battery enclosures
Materials, electrical insulation and certification are all important factors to consider when optimizing electric battery performance against potential thermal runaway.
Read MoreAlternate heat sources for hot-bonded composite repairs
Successfully using an alternate heat source for repairing composite structures requires an awareness of thermal dynamics and effective heat transfer management.
Read MoreA second look at cobonded tapered scarf repairs for composite structures
Composites repairs, such as cobonded tapered scarf repairs, seek to sufficiently restore structural loads so that components perform without failure
Read MoreAvoiding the pitfalls of vacuum infusion processing
Understand the fundamentals of vacuum infusion processing (VIP), including pressure, permeability and race tracking, to prevent issues and produce consistent results.
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Aerodynamic considerations when repairing complex composite structures
An example process gives steps and issues to consider when determining the most effective repair method for preserving the aerodynamic surface of a complex-contoured composite sandwich structure.
Troubleshooting thermoforming of thermoplastic composites
Challenges with the thermoforming/stamping process and potential solutions addressing the associated parameters and complex material behaviors.
Read MorePorosity, voids and bridging in prepreg autoclave and vacuum bag-only laminates
Consideration of materials, methods and systems explores ways to reduce potential surface porosity, voids, resin-rich areas, bridging and other flaws in composite laminates.
Read MoreChallenges of laser-assisted tape winding of thermoplastic composites
Practical solutions for process-related challenges in LATW, which has great potential for pressure vessels and storage tanks.
Read MoreTroubleshooting failures in adhesive-bonded composite joints
Cause of adhesive bonding inconsistencies or failure may be numerous. According to Louis Dorworth, the following points should be examined to determine the culprit.
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The basics of composite drawing interpretation
Knowing the fundamentals for reading drawings — including master ply tables, ply definition diagrams and more — lays a foundation for proper composite design evaluation.
