Marine Structures Research Recommendations Recommendations for the Interagency Ship Structure Committee's FY 1995 and Later-Years Research Program (1995) / Chapter Skim
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INTRODUCTION
INTRODUCTION
Pages 1-11
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The CMS keeps abreast of major technical issues of interest to federal agencies and national programs in which marine structures research can have significant positive impacts. During its 1994 meetings, the committee discussed agency research and development programs that were presented at the Ship Structure Subcommittee spring meeting; the areas of national 1
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In September 1994, the CMS held its annual joint meeting with the Ship Structure Subcommittee to discuss research areas of most interest to sponsoring agencies, the strategic plan, and the future financial status of the SSC and its potential effect on CMS efforts. The CMS recognizes that research in ship structures is being sponsored independently by agencies with relatively large funds compared with those available to the SSC.
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All thrust areas in the recommended research plan support at least two national goals of the SSC Strategic Plan, and one supports all three goals. The specific thrust areas and the goals they support are shown in the following figure, where the shaded area represents the SSC national goals addressed by each thrust area.
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The ship design process needs to be changed to reduce design time and cost; to improve design quality, including producibility; to reduce design errors: and to produce ships that yield .
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Examples of these improvements include laser alignment, faster welding techniques, improved accuracy control, the use of robotics, automated material handling, and automated storage equipment. On June 17, 1987, the CMS convened an ad hoc committee with experts in the subject areas of marine structures and structural reliability.
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In order to ascertain the large uncertainties associated with visual inspection data, and thus improve the ability to make fatigue reliability assessments, Project SR-1375, Detection Probability Assessment of Visual Inspection of Ships," will develop a probabilistic model of visual inspection. Completion of this project will improve the use of fatigue reliability in design and supplement the research project on ship inspection issues under Project SR-1355, UInspection of Marine Structures." In support of Goal ~-to improve safety and integri~reliability research goals should include: · improved methods of predicting hydrodynamic loads and structural response of ships in extreme seas; · improved methods of predicting fatigue stresses in structural components and details; · improved descriptions of material properties, including fracture, corrosion, and fatigue of common marine steels; and · development of structural-reliability theory, application to existing designs, and development of probability-based design criteria.
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and repair the following inspection/maintenance items are needed: Composites · Ship repair and construction capability must be made more economically viable through improved inspection techniques. · Repair time and material costs must be reduced and labor efficiency improvedthrough improved repair techniques such as new methods of underwater wet welding.
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and Canadian maritime industries in shipbuilding. maintenance and repair- research in composites needs to be coordinated and advanced for the determination of performance properties of anisotropic composite materials that will be used increasingly by the marine industry.
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For this and other reasons, an individual project may address more than one technology area, as well as more than one thrust area, SSC national goal, and SSC strategy. This may lead to some confusion in reading the report, but the effort has been to develop an integrated program that addresses multiple objectives.
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Number Project Title Technology Area PRODUCIBILIlY/COMPETITIVENESS PROJECTS 96-1 96-2 96-7 96-8 96-9 Evaluation of Effect of Construction Tolerances on Vessel Strength A Predictive Methodology for the Evaluation of Residual Stress and Distortion in Double-Hull Ship Structures Workshop on Industry Standards for Integrated Ship Design Software Interfaces Alternative Stiffening Systems for Double-Skin Tankers Rupture Resistance of Cargo Tanks of Double-Hull Tankers to Low Energy Impacts (95-12) 96-11 Evaluation and Assessment of Fillet Welding of Double-Bottom Structure to Resist Pollution in Groundings 96-15 Ship Bow Structural Guidance 96-16 Weldable Primers for Ship Construction (9SM-V)
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Number Project Title Technology Area INSPECTION/MAINTENANCE PROJECTS In Situ Nondestructive Evaluation of Fatigue and Fracture Properties for Aging Ship Structures (9SM-H) Methodology for Systematic Collection of Corrosion Data Using Ultrasonic Thickness Measurements of Ship Structures (9STC-B Revised)
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