Strength and Reliability Analyses of Energy and Marine Transportation Structures

Shuji AIHARA

Professor, Graduate School of Engineering, The University of Tokyo

Profile: Nippon Steel Corporation (1981.4～2006.3) Professor, Dept. Environmental & Ocean Engineering (2006.4～2008.3), Dept. Systems Innovation (2008.4～), Graduate School of Engineering, The University of Tokyo Main Works: Materials Science, Fracture Mechanics, Welding Metallurgy, Structural Reliability

Introduction ●The recent rapid economic growth in the BRICs has been demanding more energy supply, worldwide. ●Total primary energy demand in 2035 will become 1.5 times that of 2009. ●Mass transportation between countries has become more important for maintaining world's economic activities. ●Higher production of oil and gas and safer and more secure mass transportation are one of the major issues in engineering. ● A variety of structures, like energy transport pipelines, ships and offshore structures, have been developed, constructed and operated. ● Safe and secure operations of these structures are definitely important both for human lives and environmental protection.

Strength and Reliability of Pipelines for Energy Transportation

●Total primary energy supply by natural gas in the world in 2035 will become 1.6 times that of 2009. ● Most of natural gas is transported by pipelines. ● Higher operation pressure, longer distance of the pipelines for increasing demand for natural gas supply. ● Hydrogen gas pipelines for the future "hydrogen society. ● CO2 pipelines for Carbon Capture and Storage. ● Safer operation for these pipelines.

World’s first full-scale hydrogen gas pipeline burst test to examine the strength of the pipe

with SINTEF, Norway.

High-speed camera image of crack propagation and gas release

No long crack propagation was verified.

Computer simulation model to examine the effect of pressure, pipe diameter, pipe toughness, etc.

Strength and Reliability of Marine Transportation Structures

商船三井

Yamaguchi et al, ISOPE2010 Conf.

Full-scale tests for crack propagation and arrest in ship steels and welds

Yamaguchi et al, ISOPE2010 Conf.

Crack propagation path is important for crack arrest design.

Yamaguchi et al, ISOPE2010 Conf.

Crack deviation by welding residual stress

Computer simulation of crack propagation taking account of welding residual stress and toughness heterogeneity

Crack propagation along low toughness weld

Microscopic aspect of cleavage fracture

Crack front {100} planes

grain

Micromechanical model for cleavage fracture

grain size 20μｍ×20μm (simulation)

The model predicts how the crack propagates in microscopic level.

Collaborations between the University of Tokyo and Brazilian Universities

Dr. Marcos Pereira, MF ENGENHARIA & TECNOLOGIA

Dr. Marcos Pereira, MF ENGENHARIA & TECNOLOGIA

Technology development and education of engineers are urgent issues in marine and offshore development.

First Shipyard in Pernambuco -Estaleiro Atlântico Sul-

Dept. Naval Architecture established Aug.2011 at Federal University of Pernambuco (UFPE). Dr. Armando Hideki Shinohara Department of Mechanical-Materiails-Naval Engineering

Four students have been sent to U.Tokyo by Science without Borders program to study naval architectures and marine engineering, as pioneers, Nov. 2012.

Encouraged by the Brazilian Ambassador, Dec. 2012. Just arrived at Naria, Nov. 2012.

They are studying ship design and materials science at the Faculty of Engineering.

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Best fit m0b0 CTOD with experiment CTOD

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Weibull

Fracture toughness testing, electron microscopic observations and computer simulations of steels

Training at Nagasaki Shipyard, Mitsubishi Heavy Industries.

Design of Marine Structures

Ship Construction

● The Todai (U.Tokyo) Forums are aimed at strengthening academic ties with overseas universities and research institutions through collaborations of education and research in many academic fields. ● The Todai Forum 2013: Santiago, Chile (Nov. 7-8) Sao Paulo, Brazil (Nov. 11-12) workshop on fluid dynamics for marine structures, organized by U.Tokyo and U.Sao-Paulo. ● Many colleagues are welcome to join the forum!

Todai Forum