scholarly journals Consolidation Modeling during Thermoforming of Thermoplastic Composite Prepregs

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2853 ◽  
Author(s):  
Hu Xiong ◽  
Nahiène Hamila ◽  
Philippe Boisse
Keyword(s):  
Thermoplastic Composite ◽  
Solid Shell ◽  
Composite Part ◽  
Intimate Contact ◽  
Compaction Test ◽  
Proposed Model ◽  
Thermoforming Process ◽  
Shell Finite Element ◽  
Plane Shearing ◽  
Consolidation Behavior

This article describes the modeling of the compaction/consolidation behavior of thermoplastic composite prepregs during the thermoforming process. The proposed model is principally based on a generalized Maxwell approach. Within a hyperelastic framework, viscoelasticity is introduced for the compaction mode in addition to the in-plane shearing mode by taking into account the influence of the resin and its flow during consolidation. To reveal the evolution of the consolidation level, which reflects the number of voids in the composite, an intimate contact model was used during the process. The model was characterized by a compaction test at a high temperature. It was implemented into a recently developed prismatic solid-shell finite element. The analysis of the thermoforming of a double dome demonstrated the relevance of the consolidation computation in determining the process parameters leading to a composite part free of voids.

scholarly journals Advanced Thermoplastic Composite Manufacturing by In-Situ Consolidation: A Review

2020 ◽  
Vol 4 (4) ◽  
pp. 149
Author(s):  
Isabel Martin ◽  
Diego Saenz del Castillo ◽  
Antonio Fernandez ◽  
Alfredo Güemes
Keyword(s):  
Composite Materials ◽  
Manufacturing Process ◽  
Industrial Process ◽  
Thermoplastic Composite ◽  
High Deposition Rate ◽  
Intimate Contact ◽  
Thermoset Composites ◽  
Spatial Gradients ◽  
Laser Focusing

This article provides an overview of the evolution of the in-situ consolidation (ISC) process over time. This evolution is intimately linked with the advancements in each of the steps of the ISC manufacturing process, is additive in nature, and is limited by the orthotropic nature of composite materials and the physicochemical behavior of the thermoplastic matrix. This review covers four key topics: (a) Thermal models—simulation tools are critical to understand a process with such large spatial gradients and fast changes. Heating systems once marked a turning point in the development of industrial ISC systems. Today, lasers are the most recent trend, and there are three key issues being studied: The absorption of energy of light by the material, the laser profile, and the laser focusing. Several approaches have been proposed for the distributed temperature measurements, given the strong temperature gradients. (b) Adhesion—this refers to two subsequent mechanisms. In the first place, the process of intimate contact is one by which two surfaces of thermoplastic pre-impregnated composite materials are brought into contact under pressure and temperature. This enables closure of the existing gaps between the two microscopic irregular surfaces. This process is then followed by the healing or diffusion of polymer molecules across the interface. (c) Crystallinity—mostly influenced by the cooling rate, and strongly affects the mechanical properties. (d) Degradation—this refers to the potential irreversible changes in the polymer structure caused by the high temperatures required for the process. Degradation can be avoided through adequate control of the process parameters. The end goal of the ISC manufacturing process is to achieve a high product quality with a high deposition rate through an industrial process competitive with the current manufacturing process for thermoset composites.

scholarly journals A GPU Based Explicit Solid-Shell Finite Element Solver

2018 ◽  
Vol 1063 ◽  
pp. 012191
Author(s):  
Andrew J.E. Stephan ◽  
William J.T. Daniel ◽  
Michael C. Elford
Keyword(s):  
Finite Element ◽  
Solid Shell ◽  
Shell Finite Element

scholarly journals A nine nodes solid-shell finite element with enhanced pinching stress

2020 ◽  
Vol 65 (5) ◽  
pp. 1377-1395
Author(s):  
Mouhamadou Dia ◽  
Nahiene Hamila ◽  
Mickaël Abbas ◽  
Anthony Gravouil
Keyword(s):  
Finite Element ◽  
Solid Shell ◽  
Shell Finite Element

A solid-shell finite element for fibre reinforced composites

PAMM ◽  
2012 ◽  
Vol 12 (1) ◽  
pp. 329-330
Author(s):  
Jaan-Willem Simon ◽  
Bertram Stier ◽  
Stefanie Reese
Keyword(s):  
Finite Element ◽  
Solid Shell ◽  
Reinforced Composites ◽  
Shell Finite Element ◽  
Fibre Reinforced Composites

Welding of Fiber Reinforced 5-Harness Satin Woven Thermoplastic Composite Fabrics by Ultra-High Frequency Induction System

2021 ◽  
Author(s):  
Oner Hasim Olgun ◽  
UGUR CAVDAR
Keyword(s):  
High Frequency ◽  
Sem Analysis ◽  
Woven Fabrics ◽  
Thermoplastic Composite ◽  
Intimate Contact ◽  
Ultra High Frequency ◽  
Induction System ◽  
Composite Fabrics ◽  
Glass Surfaces ◽  
High Frequency Induction

Abstract In this study, we report 6 plies of 5-harness satin woven fabrics were welded each other by ultra high frequency induction system between two tempered glass surfaces at 400°C under 640 kPa pressure for 120 seconds. The results of mechanical properties, Brinell hardness tests and SEM analysis proved an intimate contact between plies allowing the fusion in the bonding area for PEEK matrix.

Sign in / Sign up

Export Citation Format

Share Document