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Metal Fatigue and Fracture Mechanics Lab
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The lab works toward the safety of mechanical structures by studying metal fatigue and the strength of materials.
AboutAbout the lab
Investigating material strength to keep machines operating safely
With the ultimate goal of making mechanical structures operate "safely," the Solid Mechanics Lab studies the strength of materials and how they fail.
Its basic evaluation model is the Stress-Strength Model, which compares the stress generated in a mechanical structure with the strength of the material.
Because many problems remain unsolved on the strength side, the lab conducts experiments and analyses from the viewpoint of micromechanics and connects the results to computational science methods.
Taking into account failures caused by several factors combining, the lab also studies methods for preventing failures of real-world mechanical systems, such as automobiles, at the development stage.
Key terms
- Metal fatigue
- A phenomenon in which cracks form and grow in a metal component, eventually leading to fracture
- Stress-Strength Model
- A model that evaluates safety by comparing the stress generated in a machine with the strength of the material
- Hydrogen embrittlement
- The process by which a metal becomes brittle and more prone to fracture because of the effects of hydrogen
NewsLab news
A master's student received the 3rd Best Poster Award at ECF25
A doctoral student received the FY2025 Graduate Research Encouragement Award from the Society of Automotive Engineers of Japan
An undergraduate student received the Outstanding Presentation Award at the Undergraduate Thesis Presentation Meeting of the Kyushu Branch of the Japan Society of Mechanical Engineers
A master's student received the Young Researcher Award at a meeting of the Kyushu Branch of the Society of Materials Science, Japan
A doctoral student received the FY2025 Women's Future Award from the Japan Society of Mechanical Engineers
ResearchResearch themes
Aiming to make mechanical structures operate safely, the lab investigates the strength of materials through experiments and analysis from the viewpoint of micromechanics. Centered on metal fatigue, it also works on the effects of hydrogen, materials for electronic devices, and the evaluation of local mechanical properties.
*Illustrative imageElucidating Metal Fatigue and Evaluating Materials
The lab works on clarifying the mechanisms of metal fatigue and on simulating crack propagation and arrest. It also studies the fatigue strength of light metals, the fatigue properties of rail steel, and the creation and evaluation of new fatigue-resistant steel materials.
*Illustrative imageEffects of Hydrogen on Metals
The lab investigates fatigue crack propagation behavior in hydrogen environments. It also studies simulation of hydrogen embrittlement using the finite element method, and the effect of hydrogen localization on tensile properties.
*Illustrative imageThermal Fatigue of Electronic Device Materials
In the field of electronic devices, the lab evaluates the thermal fatigue properties of epoxy composites.
*Illustrative imageLocal Fatigue Properties and Residual Stress
This research uses indentation to determine the local mechanical fatigue properties and residual stress of materials.
MembersFaculty
The Solid Mechanics Lab consists of faculty members, technical staff, administrative assistants, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorShigeru Hamada
- Associate ProfessorToshiyuki Kondo
VoicesStudent voices
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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: “CR510 steel bridge 1922” Michigan State Highway Department / Public domain (cropped)
- Elucidating Metal Fatigue and Evaluating Materials: “Crankshaft fatigue” Peterlewis / CC BY-SA 3.0 (cropped)
- Effects of Hydrogen on Metals: “Hydrogen scooter ICE-metal hydride storage” U.S. DOE Energy Efficiency and Renewable Energy (EERE) / Public domain (cropped)
- Thermal Fatigue of Electronic Device Materials: “Soldering iron (UK Plug)” Soldering_iron_and_accessories.jpg: oomlout derivative work: Bomazi / CC BY-SA 2.0 (cropped)
- Local Fatigue Properties and Residual Stress: “STRESS MAPPING FACILITY AT ORNL” ENERGY.GOV / Public domain (cropped)
- Related lab (Hydrogen-Compatible Materials and Hydrogen Embrittlement Prevention Lab): “CERAMIC CREEP TEST FIGURES AND SECTIONS - NARA - 17444514” Martin Brown / Public domain (cropped)
- Related lab (Hydrogen Equipment Tribology Lab): “Rolling-element bearing (numbered)” Niabot / CC BY-SA 3.0 (cropped)
- Related lab (Hydrogen Equipment Tribology Lab (Hiroyoshi Tanaka)): “Silicon nitride Si3N4 bearing ball 10 mm G10” Lucasbosch / CC BY-SA 3.0 (cropped)
- Related lab (Hydrogen Embrittlement of Metallic Materials Lab): “Liquid hydrogen storage tank at Launch Pad 39B” TomFawls / CC BY-SA 3.0 (cropped)
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