Forming of composites: thermal analysis of processes
Fully understanding heat transfer in forming processes for polymers and composite materials is a major industrial factor.
Our work ranges from characterizing your composite materials to optimizing thermal parameters for your manufacturing processes. Throughout the course of our aerospace projects, we have acquired unique know-how for understanding and optimizing the heat transfers involved in welding composite materials.
Our engineering and R&D services
Our PhD engineers conduct cutting-edge research in heat transfers and put their scientific expertise to use for your R&D projects. They use innovative techniques to meet your industrial needs: process optimization, maximizing product quality, superior assembly performance.
Conductivity – Effusivity – Thermal Diffusivity
Characterizing thermal conduction properties in conditions representative of processes.
Measuring the thermal conductivity tensor of an anisotropic composite on reinforcement alone or on cured / uncured composites
Measurements on partially crosslinked materials
Measuring thermal resistance on thin film
Volumetric shrinkage – Thermal dilation
Understanding the coupling between thermal and chemical effects through the precise characterization of volumetric variations of polymers and composites.
Alpha-PVT: chemical shrinkage of a thermosetting matrix
3D PVT: anisotropic chemical shrinkage of composites
Thermoplastic PVT: PVT Diagrams – crystallization shrinkage – Tait model – crystallization under pressure
Thermal expansion coefficients on uncured, rubbery or glass resin
Bulk modulus evolution of resin while curing
Determining resin viscosity in the melted state and understanding temporary or permanent deformations of your composite materials.
Viscosity of reactive systems
Identifying the relaxation time of polymer chains
Measurements of complex and non-Newtonian fluids
Infra-red heating – Radiative properties
Mastering infra-red heating processes for polymers and composites in order to reach target temperatures in tools and parts.
Characterizing absorption, reflection, and transmission properties
Dependence on temperature and the angle of incidence
Welded composites assembly
Defining a process window for welding thermoplastic composites
Measuring creep time for high-performance matrices
Welding tests on composite specimens
Associated mechanical tests (G1c, SLS)
Identifying parameters for thermo-kinetic models to predict phase changes
Crosslinking a thermosetting resin
Crystallization of a semi-crystalline polymer
Vulcanization of elastomers
Kinetic reactions of glues
Glass transition temperature evolution with the degree of cure (Di Benedetto)
Simulation and thermal modeling
Predicting heat transfers for sizing, understanding, or optimizing polymer and composite forming processes
Sizing of forming tools
Thermo-kinetic models to predict a part’s degrees of cure
Optimizing heating and cooling cycle time
Multiphysics simulations: coupling with the kinetics of polymerization, mechanics, electricity, etc.
Developing personalized metrology solutions for measuring your composite materials’ thermal behavior and associated processes
Instrumentation of on-site composite parts and industrial machines, thermal mapping
Developing specialized innovative sensors and measurement protocols
Designing and making original test benches
Support from research laboratories
Our teams receive support from the laboratories at the University of Nantes and benefit from their technical equipment in order to successfully complete your innovative projects.
Heat transfer of polymers and composites
Professor at the University of Nantes, member of the LTeN team for “Thermal Transfers in Materials and at Interfaces,” Scientific manager at Capacités.
His research activities focus on the thermal science of polymer and compositeforming and concern three complementary areas:
Thermal characterization of polymers and composites during the transformation process and developing novel apparatuses.
Modeling coupled transfers in the formingprocess (thermoplastic injection, RTM, FFF…).
Heat Transfer and Energy Laboratory at Nantes (LTeN)
LTeN is a heat transfer research unit that is recognized nationally and internationally, as well as in the industrial sector. The laboratory has two research areas: transfers in fluids and energy systems and thermal transfers in materials and at interfaces.
More than 220 pieces of industry-specific equipment
Our team has a rich and varied fleet of machines at its disposal. We make sure to utilize the most suitable technical means for each project. To do so, we design specialized test benches that are tailored to polymers, resins or composites representative of each process.
A key player in the aeronautics sector called on Capacités’s specialists to determine the thermal conductivity properties of a composite material reinforced with short fibers during the injection process.