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Materials Structural Integrity Evaluation Lab
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A lab that studies the mechanisms of fracture in order to prevent structures from breaking.
AboutAbout the lab
Understanding how things break, to keep them from breaking.
The Materials Structural Integrity Evaluation Lab (Ohata Lab) studies the mechanisms by which large structural members, such as steel for buildings, bridges, and other infrastructure structures, fracture.
Guided by the philosophy of "knowing how things break, to research how to keep them from breaking," the lab works to build the foundations of fracture evaluation technology and to develop theory and simulation technology that lead to the design of new materials and joints.
By linking different hierarchical levels, from the performance of structural members to the properties of materials, the lab approaches the mechanisms of fracture.
Key terms
- Mesoscale
- The level from material properties to microscopic structure. The level from the performance of structural members to material properties is called the macroscale
- Local approach
- A method of approaching the mechanisms of fracture phenomena not only through mechanics but also from the perspectives of materials science and microscopic structure
- Fracture mode
- A type of way in which fracture occurs. This lab lists ductile fracture, brittle fracture, fatigue, and environmental fracture
ResearchResearch themes
Large structural members such as steel for buildings, bridges, and other infrastructure structures must not fail under actual operating conditions, for safety. Starting from understanding the mechanisms of fracture phenomena, the lab conducts research that leads to the design of reliable, safe structures and to the development of materials and joining processes.
Linking Fracture Performance across Scales
The lab calls the level from the performance of structural members to material properties the macroscale, and the level from material properties to microscopic structures the mesoscale. It pursues a discipline that quantitatively bridges fracture performance and properties across these different levels in both directions.
*Illustrative imageAdvanced Fracture Simulation
The lab uses the local approach to model the mechanisms of fracture mathematically and incorporates them into numerical analysis, developing technology to capture the fracture behavior of microstructures, materials, and structures. It aims to capture fracture modes such as ductile fracture, brittle fracture, fatigue, and environmental fracture, as well as their transitions and superposition.
MembersFaculty
The Materials Structural Integrity Evaluation Lab (Ohata Lab) consists of faculty members, technical assistants, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorMitsuru Ohata
- LecturerHiroto Shoji
- Assistant ProfessorKazuma Shimizu
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: “Steel Girder Bridge - geograph.org.uk - 6113684” David Robinson / CC BY-SA 2.0 (cropped)
- Advanced Fracture Simulation: “Biomechanics-Femur-Fracture-Nail-Internal Fixation-CAD-FEM” Fry72 Karel Frydrýšek, Tomáš Halo, Daniel Čepica / CC BY-SA 4.0 (cropped)
- Related lab (Process Mechanics Lab): “Ultrasonic Welding” NearEMPTiness / CC BY-SA 3.0 (cropped)
- Related lab (Joining Microstructure Design Lab [Joining and Welding Research Institute]): “Stainless pipe weld joints” Flattrackers and Caferacers Parts and bikebuilds / CC BY-SA 2.0 (cropped)
- Related lab (Solid Mechanics Lab): “The brittle fracture surface of low-carbon steel” DanilovVA / CC BY-SA 4.0 (cropped)
- Related lab (Process Metallurgy Lab): “US Army soldier welding two metal pieces, Fort Gregg-Adams, Virginia, March 2025” Juan F. Jimenez, Army / Public domain (cropped)
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