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Okabe-Ryuzono-Mishima Lab
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The lab investigates how composite materials fail.
AboutAbout the lab
How do composite materials fail?
The Okabe-Ryuzono-Mishima Lab studies how fiber-reinforced composite materials such as CFRP deform and fail.
Composite materials are strong and stiff for their weight, and the next-generation passenger aircraft under development plan to use CFRP for major structures such as the fuselage and main wings.
Compared with homogeneous materials such as metals and ceramics, composite materials fail in a much wider variety of ways, and methods for analyzing their damage have developed in their own right.
In recent years, advances in computers have made it possible to examine in detail, on a computer, damage processes that experiments could capture only in fragments.
Key terms
- Composite material
- A material that combines constituents with different properties, such as fibers and resin, to achieve properties superior to those of any single constituent
- CFRP
- Carbon fiber reinforced plastic. A structural material with excellent specific strength and specific stiffness
- Damage mechanics
- Mechanics that treats the effect of growing microcracks and voids as a change in the properties of the material as a whole
NewsLab news
Paper on the viscoelastic response of crosslinked rubber accepted to Macromolecular Theory and Simulations
Paper on the synthesis of branched poly(phenylene ether) published in Polymer Chemistry
Paper on network heterogeneity during epoxy curing published in Polymer
Paper on a multiscale model of toughening of thermosetting resins published in International Journal of Solids and Structures
Paper on the three-dimensional structure and mass transport of silicone hydrogels published in Soft Matter
ResearchResearch themes
The lab studies fiber-reinforced composite materials, whose use in the aerospace field is expected to expand, focusing in particular on fracture and deformation. As composite materials reach the stage of being used in actual structures, clarifying how they fail has become a key challenge.
*Illustrative imageHow do composite materials fail?
The lab focuses on the fracture and deformation of fiber-reinforced composite materials. They fail in far more varied ways than homogeneous materials, and simply applying fracture mechanics or damage mechanics cannot evaluate them correctly.
*Illustrative imageKnowledge manifolds: turning documents into a map
A space in which many documents are arranged according to their semantic relationships is called a knowledge manifold. The lab converts the text of papers into numerical vectors and projects them into two dimensions to build a semantic map of papers, and studies a method for estimating even hypothetical knowledge that lies between existing papers.
MembersFaculty
The Okabe-Ryuzono-Mishima Lab consists of faculty members, researchers, technical assistants, secretaries, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorTomonaga Okabe
- Assistant ProfessorKazuki Ryuzono
- Assistant ProfessorShoko Mishima
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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: “" 13 Fiat-Chrysler - Safety - Carbon Fiber Composite Roof Assembly SRT Viper capote” spe.automotive / CC BY 2.0 it (cropped)
- How do composite materials fail?: “Tests de rupture sur des assemblages de raidisseurs (Ifremer )” Stephane Lesbats / CC BY 4.0 (cropped)
- Knowledge manifolds: turning documents into a map: “Linkedin maps data visualization” Luc Legay / CC BY-SA 4.0 (cropped)
- Related lab (山本(剛) 研究室): “Carbon fiber pieces for Shell Eco-marathon prototype wheels Proto INSA Club” Proto INSA Club / CC BY-SA 4.0 (cropped)
- Related lab (田中
(秀)・VERGARA・GUO 研究室): “AE National Semiconductor B9212 GAL16V8QS-25QNC c AST B AD” Epop / CC BY-SA 3.0 (cropped) - Related lab (塚本 研究室): “Integrated-circuit-open” 作者不詳 / Public domain (cropped)
- Related lab (山﨑・RANULFO 研究室): “ER-FLEX manipulator” Auledas / CC BY 4.0 (cropped)
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