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Yamamoto (Go) Lab
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The lab uncovers the strength of composite materials from nanoscale fibers.
AboutAbout the lab
Nanoscale threads determine a material's strength.
The Yamamoto Lab studies the mechanics of composite materials made with carbon fibers and carbon nanotubes.
Using in situ observation with synchrotron X-rays and electron microscopes, the lab examines where and how materials fail, and builds models that predict strength.
It links the nano, micro, and macro scales to clarify the relationship between structure and mechanical properties.
The lab is also developing methods to measure the elastic constants of materials with complex shapes without cutting them.
Key terms
- Carbon nanotube
- A nanometer-scale fiber in which carbon atoms are joined in a tubular shape. Light and strong
- Elastic constant
- A number expressing how much a material deforms when force is applied. In some materials the value differs by direction
- Synchrotron radiation
- Extremely bright X-rays emitted by accelerated electrons. Used to see the inside of objects in fine detail
NewsLab news
Paper on the interfacial shear strength of carbon fiber reinforced injection-molded materials accepted to Composites Part B
Paper on the anisotropic elastic constants of complex-shaped Ti-6Al-4V accepted to Journal of Materials Research and Technology
Paper on the fracture behavior of carbon nanotube yarns in resin accepted
Paper investigating the role of yarn-to-yarn interaction in the fracture behavior of unidirectional CNT yarn reinforced plastics accepted to Composites Science and Technology
Book "Surface Treatment, Dispersion, and Compounding Technologies of Carbon Nanotubes and Industrial Applications" published; a section on structure control of multi-walled carbon nanotubes by heat treatment was written for it
ResearchResearch themes
The lab investigates the relationship between structure and mechanical properties at the nano, micro, and macro scales in composite materials reinforced with carbon fibers or carbon nanotubes. It captures fracture processes through synchrotron X-ray imaging and mechanical testing inside electron microscopes, and uses the results to develop strength prediction models and methods for measuring elastic constants.
*Illustrative imageWatching CNT yarns at the moment they break
Twisted yarns of multi-walled carbon nanotubes are nano- to micro-scale in size, which made it difficult to observe how they fail inside a resin. Using synchrotron X-ray nano-imaging of model specimens with two CNT yarns embedded in resin, the lab has captured, for the first time in the world, the fracture process in three dimensions and in situ as the tensile load increases.
*Illustrative imageMeasuring material stiffness without cutting
The lab is developing a method that uses resonant ultrasound spectroscopy, which exploits the resonant vibration of solids, to measure the elastic constants of materials that have complex three-dimensional shapes and direction-dependent properties. If the independent elastic constants can be measured all at once without machining or surface treatment, the method would be useful for quality evaluation of 3D-printed materials, among other applications.
*Illustrative imagePulling a yarn inside an electron microscope
In CNT spun yarns, tension causes the helically arranged CNTs to generate a compressive force toward the center of the yarn, a self-constraining mechanism. To confirm whether this mechanism also works inside resin, the lab conducts tensile tests inside a transmission electron microscope and examines changes in twist angle and diameter as strain increases.
*Illustrative imagePredicting the strength of carbon fiber composite materials
The lab has built a numerical analysis model that accounts for the stress concentration a broken carbon fiber exerts on neighboring intact fibers, and has succeeded in predicting the tensile strength of unidirectional carbon fiber reinforced plastics with high accuracy. The method has been shown to be highly general, working even when the type of resin or carbon fiber changes.
MembersFaculty
The Yamamoto Lab consists of faculty members, secretaries, researchers, and doctoral, master's, and undergraduate students.As of 2026
- Associate ProfessorGo Yamamoto
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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: “Carbon fiber pieces for Shell Eco-marathon prototype wheels Proto INSA Club” Proto INSA Club / CC BY-SA 4.0 (cropped)
- Watching CNT yarns at the moment they break: “Industrial Computed Tomography - Failures - Void” Jgarant / CC BY-SA 4.0 (cropped)
- Measuring material stiffness without cutting: “FZU 3Dprinting 4” René Volfík / CC BY-SA 4.0 (cropped)
- Pulling a yarn inside an electron microscope: “CSIRO ScienceImage 988 Carbon nanotubes spun to form a yarn” CSIRO / CC BY 3.0 (cropped)
- Predicting the strength of carbon fiber composite materials: “Carbon fiber (cropped)” Cjp24 / Public domain (cropped)
- Related lab (岡部・龍薗・三島 研究室): “" 13 Fiat-Chrysler - Safety - Carbon Fiber Composite Roof Assembly SRT Viper capote” spe.automotive / CC BY 2.0 it (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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