Fatigue, Fracture, Welding Mechanics and Production Systems

Research

HOME  >  Research  >  Department of Marine Systems Engineering  >  Laboratories  >  Fatigue, Fracture, Welding Mechanics and Production Systems

Fatigue, Fracture, Welding Mechanics and Production Systems

Overview

photo

An example of fatigue crack growth analysis
of steel floodgate

Education and research areas in our laboratory include: 1) the construction and production systems of large structures; 2) the evaluation of the integrity of structures and materials based on strength of materials, elasticity, plasticity, fracture mechanics, reliability analysis and evaluation of material deterioration that occurs in processing and in service conditions. Our laboratory focuses on developing the concept of Fracture Control Design by Analysis, which corresponds to the combination of Fracture Control Design with the methodology of Design by Analysis. We aim to develop a design method that will allow analytical prediction of the entire process of fatigue crack nucleation and propagation, as well as the limits of unstable fracture occurrence. The design method will be applicable to various structures and will take into account the production process. If the development of this method is accomplished, not only will it be possible to predict fracture occurrences quantitatively at the design stage and reasonably plan for maintenance inspections, but large-scale rationalization of the production line will also be made possible. Furthermore, in the case of structures that are in service, the assessment of remaining life and maintenance checks will be more accurate; and in the case of new structures, the assessment of their resistance to fracture will be markedly more accurate.

Staff

Associate Professor Koji Gotoh
Assistant Professor Seiichrio Tsutsumi
Technical Staff Koji Murakami

The Main Research Topics

  • Numerical simulation of fatigue crack growth based on the strip yield model under variable loading histories
  • Strain rate and temperature effects on unstable fractures
  • Practical estimation of deformations and residual stresses caused by welding
  • Mechanical properties of polyethylene resin materials applied to the city gas pipelines
Back to top