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Solid Mechanics Lab
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The lab investigates the strength of materials so that machines can be used safely.
AboutAbout the lab
Exploring material strength for the safe use of machines.
The Solid Mechanics Lab studies the strength of materials used in machines, with the ultimate goal of making mechanical structures operate safely.
The safety of a machine is evaluated with the Stress-Strength Model, which compares the applied force (Stress) with the strength of the material (Strength), but many problems remain unsolved on the strength side.
The lab therefore examines strength experimentally and analytically from the viewpoint of micro-scale mechanics, and links the results to computer-based analysis methods.
While investigating metal fatigue and the effects of hydrogen, the lab also works on solving failure problems in real mechanical systems such as automobiles.
Key terms
- Stress-Strength Model
- A model that evaluates safety by comparing the force applied to a structure (Stress) with the strength the material can withstand (Strength)
- Metal fatigue
- A phenomenon in which a metal subjected to repeated loading develops cracks and fails
- Hydrogen embrittlement
- A phenomenon in which hydrogen enters a metal, making it brittle and more likely to fracture
NewsLab news
A master's student won the 3rd Best Poster Award at ECF25
A paper on hydrogen-related fracture of ultra-high-strength martensitic steel was published in Engineering Fracture Mechanics
A paper on the fatigue limit of low-carbon low-alloy martensitic steel was published in ISIJ International
A doctoral student received the 2025 Graduate Student Research Encouragement Award from the Society of Automotive Engineers of Japan
An undergraduate student received the Excellent Presentation Award at the Undergraduate Thesis Presentation Meeting of the Kyushu Branch of the Japan Society of Mechanical Engineers
ResearchResearch themes
The Solid Mechanics Lab investigates the strength of materials through experiments and analysis from the viewpoint of micro-scale mechanics, so that mechanical structures operate safely. Its research is presented in four areas: metal fatigue, hydrogen-related topics, electronic devices, and material properties.
*Illustrative imageMechanisms of metal fatigue and strength evaluation
The lab studies the mechanisms by which metal fatigue occurs. Targeting light metals such as flame-retardant Mg alloys, and rail materials, it works on crack growth simulation, methods for predicting fatigue life, and the creation and evaluation of new fatigue-resistant steel materials.
*Illustrative imageEffects of hydrogen on material strength
The lab studies how fatigue cracks grow in a hydrogen atmosphere. It also conducts finite element simulations of hydrogen embrittlement and research on how hydrogen localization affects tensile properties.
*Illustrative imageThermal fatigue properties of electronic device materials
In the field of electronic devices, the lab works on evaluating the thermal fatigue properties of epoxy composites.
*Illustrative imageLocal fatigue properties and residual stress
Using indentation, the lab works on identifying the local mechanical fatigue properties and residual stress of materials.
MembersFaculty
The members of the Solid Mechanics Lab are faculty, 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: “Tensile testing on a coir composite” Kerina yin / CC0 (cropped)
- Mechanisms of metal fatigue and strength evaluation: “MetalFatigue 003” National Institute of Standards and Technology / Public domain (cropped)
- Effects of hydrogen on material strength: “Steel-with-Hydrogen-Induced-Cracks-01” CEphoto, Uwe Aranas / CC BY-SA 4.0 (cropped)
- Thermal fatigue properties of electronic device materials: “Cold solder joint2” MyName (Coronium (talk)) / CC BY-SA 3.0 (cropped)
- Local fatigue properties and residual stress: “STRESS MAPPING FACILITY AT ORNL” ENERGY.GOV / Public domain (cropped)
- Related lab (構造材料評価研究室): “TiAl duplex” Lne / CC0 (cropped)
- Related lab (設計工学研究室): “Prosthesis 002” National Institute of Standards and Technology / Public domain (cropped)
- Related lab (材料加工学研究室): “Iron powder” Anonimski / CC0 (cropped)
- Related lab (マイクロメカニクス): “L-R, front to back - Inconel nickel-copper; Beryllium-copper (no-spark tools); steel; magnesium; aluminum; titanium” Bill Abbott / CC BY-SA 2.0 (cropped)
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