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Koyanagi Lab
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The lab investigates carbon-fiber composite materials through both computation and experiment.
AboutAbout the lab
Unraveling the properties of composite materials through mechanics
The Koyanagi Lab studies, from a mechanics perspective, polymer-based composite materials used in aerospace that are strong for their weight.
With the design of aircraft and spacecraft in mind, the lab evaluates the thermal and mechanical properties of composite materials and structures through both experiments and analysis.
The lab also aims to improve material properties by creating new composite materials.
Key terms
- CFRP
- A polymer composite reinforced with carbon fiber. It is the central material the lab works with.
- Finite element method
- A numerical simulation method that divides an object into small elements and calculates deformation, temperature, and other quantities.
- Molecular dynamics
- A method that follows the motion of atoms and molecules by computation to study the properties of materials.
ResearchResearch themes
To contribute to the design and manufacturing technology of carbon fiber reinforced polymer composites (CFRP), the lab uses a variety of simulations, centered on the finite element method and including molecular dynamics. Results are verified by experiments, and the key point is how to connect phenomena at the nanoscale and the macroscale.
*Illustrative imagePredicting the Residual Strength and Life of CFRP
The lab aims to quantitatively predict the residual strength and life of CFRP, using thermodynamic entropy as a measure of microscopic damage. Viscoelastic and viscoplastic constitutive equations are applied to the resin, and fracture is investigated by comparing experimental and numerical results.
*Illustrative imageThermal Protection for Spacecraft Entering the Atmosphere
The lab studies how to protect spacecraft from the heat generated during entry into the atmosphere of Mars or Earth. It carries out heat shield design, heat resistance evaluation, thermal analysis, and evaluation of thermal insulation materials, in joint research with JAXA.
*Illustrative imageMaterials Design from the Atomic Level
This research designs materials from an atomic perspective using molecular dynamics. It deals with interfacial bonding, graphene composites, liquid crystals, biomimetics, and more, and the lab is a core member of the molecular dynamics research group of the Japan Society for Composite Materials.
*Illustrative imageAnalysis of Ultrasonic Welding of CFRP
The lab uses two-dimensional finite element models to study how the shape of the resin bead (energy director) placed between CFRP parts affects temperature rise and deformation during ultrasonic welding. It finds that triangular beads heat up more easily, but are not always advantageous.
MembersFaculty
The Koyanagi Lab consists of faculty members, researchers, and master's and undergraduate students.As of 2025
- ProfessorJun Koyanagi
- Assistant Professor (Former Title, Jokyoju)Youtong Li
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Examples of TFP performs produced with carbon, glass (left) or metallic fibers (right) (2)” Xabier.irastorza / CC BY-SA 3.0 (cropped)
- Predicting the Residual Strength and Life of CFRP: “UV Cured Powder Coating on Carbon Fiber” Speedoflight1 / CC BY-SA 4.0 (cropped)
- Thermal Protection for Spacecraft Entering the Atmosphere: “Blunt body reentry shapes” NASA / Public domain (cropped)
- Materials Design from the Atomic Level: “The surface of highly curved lipid bilayer” Semen Yesylevskyy / CC BY 4.0 (cropped)
- Analysis of Ultrasonic Welding of CFRP: “Ultraschall-Schweißmaschine” Herrmann Ultraschalltechnik GmbH & Co. KG / CC BY-SA 4.0 (cropped)
- Related lab (新井研究室): “KSC-06pd0021 - Engineer testing a new Space Shuttle thermal tile” NASA / Public domain (cropped)
- Related lab (望月研究室): “Crystal structure of gamma-Oxygen” Forbes72 / CC BY-SA 4.0 (cropped)
- Related lab (西尾研究室): “CO2 Sensor SCD30” Sensirion AG / CC BY-SA 4.0 (cropped)
- Related lab (勝又研究室): “Tomek Rygalik Kobro Tribute Chair 2026 transparent glass Polish modernism exhibition Warsaw 2026” Siarhei V / CC BY-SA 4.0 (cropped)
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