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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APPENDIX A: LATER-YEAR POTENTIAL PROJECTS IN SUPPORT OF THRUST AREAS
APPENDIX A: LATER-YEAR POTENTIAL PROJECTS IN SUPPORT OF THRUST AREAS
Pages 93-118
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From page 93... ...
In the individual project descriptions, the initials of the work group member who originated the project is given r-~ ~ TABLE 7 Later-Years Potential Projects in Support of Thrust Areas. Sheet ~ Number Project Title Primaly Page Technology Area PRODUCIBILITY/COMPETITIVENESS PROJECTS 96D-P Student Design Competition for Innovative Design 95 Producible Marine Structures 96D-Q Integrate HOE Considerations into Ship Design 97 Structure Construction and Maintenance 96M-B The Definition of Local Brittle Zones in the Materials 98 Heat-Affected-Zones of Low-Alloy Criteria High-Strength Steel Weldments 96M-G Development of High-Performance Fabrication and 99 Tubular/Flux Cored Weld Filler Metal Maintenance 96M-H Effect of Weld Surface Quality on Hull Fabrication and 101 Structural Integrity Maintenance 96M-N Atias of Welding Properties and Procedures Materials 102 Criteria 96M-Q Performance and Optimized Weld Metal Materials 103 Properties of Domestically Produced Criteria AC/DQ Steels (]
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From page 94... ...
Development of Smart Coatings for Early Fabrication and 111 Detection of UnderfiIm Corrosion Maintenance 96M-M Underwater Wet Repair Using Solid State Fabrication and 112 Welding Maintenance 96M-S Retrofit of Marine Cathodic Protection Materials 113 Systems (9SM-A) Criteria 96M-U Threshold and Near-Threshold Corrosion Materials 114 Fatigue Testing of Marine Steels (9SM-N)
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From page 95... ...
and Canadian maritime industry in shipbuilding, maintenance, and repair. SSC Strategy Sponsoring university research in areas such as design tools development, producibility, production processes, reliability design, and damage-tolerant structures Background During the last few years, conferences have speculated on the next generation of commercial and naval ships and on offshore platforms ranging from nearshore to deep-water platform designs.
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From page 96... ...
Produce a final report and give an oral presentation to a special- meeting of the SSC in conjunction with a Society of Naval Architects and Marine Engineers meeting, pernaps as a special session in the regular meeting program. Duration 200 labor hours over 2 years, with up to $4S,000 in awards and prizes to schools.
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From page 97... ...
SSC Strategy · Development of better design tools and information systems · Improved engineering analysis and evaluation Background From 1993 to 1994, the Ship Structure Committee sponsored the project The Role of Human Error in Design, Construction, and Reliability of Marine Structures" (SSC-378~. This project explored the implications of HOE as it related to development of a probability-based load and resistance factor design guideline for ship structures.
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From page 98... ...
SSC National Goal Improve the safety and integrity of marine structures. SSC Strategies · Development of structures-related producibility technology · Development of reliability design techniques to optimize material use Background In recent years, the incidence of low fracture toughness in test-weld heataffected zones (HAZs)
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From page 99... ...
· Recommend criteria bounding the chemical composition of the steel, its thermal-mechanical processing parameters, and the welding parameters of the joining processes to reduce significantly, or eliminate, the incidence of low HAZ toughness. Duration 2,000 labor hours over 2 years BRS/96M-G Development of High-Performance Tubular/Flux Cored Weld Filler Metal Objective Reduce new-ship construction costs and improve reliability through the development of high-strength weld metals with yield strengths of 550 MPa to 690 MPa and above (80 ksi to 100 ksi)
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From page 100... ...
Closely aligned with the development of new consumables must be the development of better weldability test procedures for weld metals. The current project SR-1357, Retention of Weld Metal Properties and Hydrogen," addresses this area.
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· Recommend commercial specification and commercialization plan. Duration Phase ~ 1,500 labor hours over ~ year Phase 2 4,000 labor hours over 2 years IMS/96M-H Effect of Weld Surface Quality on Hull Structural Integrity Objective Investigate the available literature and data on the effect of weld quality as determined by visual inspection of the surface of the weld on weld properties and hull structural integrity.
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· Prepare a report summarizing results of the investigation, and make recommendations for further experimental work that may be needed to relate weld-surface quality to service performance and hull integrity. Duration 1,500 labor hours over ~ year DPE/96M-N Atlas of Welding Properties and Procedures Objective Provide an easy-to-use source of information for welding properties and procedures for common shipbuilding materials.
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From page 103... ...
Initial results from Project SR-1343, Optimized Weld Metal Properties for Ship Structure," on steels with a 100-ksi y~eld-strength indicates that weldment transverse strength is not affected by a slight yield-strength undermatch. If 70-class weld metals could be used to join a steel with a 65-ksi yield-strength steel, the shipbuilder could use 103
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From page 104... ...
SSC Strategies . · Development of reliability design techniques to optimize material use Development of better design tools Background A 5-year research program has been initiated by the SSC to apply reliability technology to marine structures and to develop probability-based design criteria for ship structures.
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From page 105... ...
summarized the present state of the art in reliability design. The fifth phase, recommended as Project 964, ~Probability-Based Design (Phase 5~: Load and Resistance Factor Design Method for Ship Structures," is a four-phase project that wait implement the load and resistance factor design methodology in ship designs.
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From page 106... ...
SSC Strategy Development of reliability design techniques to optimize material use Background The SSC sponsored a group of projects whose object was to develop load and resistance factor design criteria for ship structures. In order to achieve this objective, basic strength parameters need to be defined in statistical forms.
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From page 107... ...
and Canadian marine industry in shipbuilding, maintenance, and repair. SSC Strategy Development of reliability design techniques to optimize material use Background The SSC sponsored several projects whose goal was to develop load and resistance factor design criteria for ship structures.
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From page 108... ...
SSC National Goal Improve the safety and integrity of marine structures. SSC Strategy Development of reliability design techniques to optimize material use Background Charpy V-notch (CVN)
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From page 109... ...
Duration Phase ] : 750 hours over ~ year Phase 2: 1,500 hours over ~ year MCX/96D-L Strategies for Control of Bottom Pitting Corrosion in Tankers and Evaluation of Optimum Inspection Frequency Objective Recommend an optimum strategy for control of pitting corrosion in tankers, and develop a methodology for determining an optimum inspection interval that would minimize life-cycle inspection and maintenance costs and will meet safety and pollutionprevention requirements.
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SSC National Goal Improve the safety and integrity of marine structures. SSC Strategy Improvecl structural inspection techniques Background The ultrasonic testing method has been used extensively in Navy ship construction, and considerable documentation is available comparing ultrasonic methods with radiographic ones.
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Duration 1,000 labor hours over ~ year 'lFM/96M-} Development of Smart Coatings for Early Detection of Underf~Im Corrosion Objective Develop smart coatings that are capable of detecting early stages of corrosion. Benefit Smart coatings should greatly assist inspections, enhance reliability, and improve safety.
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From page 112... ...
: 3,000 labor hours over 2 years Phase 2: 2,000 labor hours over 2 years DPE/96M-M Underwater Wet Repair Using Solid State Welding Objective Evaluate the use of underwater friction welding for permanent repair of damaged commercial ship hulls. Benefits Solid-state underwater wet welding offers the potential for better properties, no porosit.v, and lower operator skill requirements when compared with conventional wet-arc welding.
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From page 113... ...
SSC National Goal Improve the safety and integrity of marine structures. SSC Strategy Improved efficiency for repair technology Background For the past several decades, the primary technique for protecting marine structures, such as tankers, offshore petroleum production structures, and pipelines from corrosion has been cathodic protection.
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From page 114... ...
SSC National Goal Improve the safety and integrity of marine structures. SS~ Strategy Development of reliability design techniques to optimize material use Background Fatigue and corrosion fatigue are generally recognized as important failure modes for marine structures because of the unsteady nature of service loadings.
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From page 115... ...
· Recommend a specimen type and test procedure for near-threshold fatiguecrack growth-rate and EKE determinations for test conditions relevant to · ~ marine service. -In Duration 3,000 labor hours over 2 years IFM/96M-K Implementation Plan for Use of Polymer-Based Composites in Ship Structures Objective Dentin applications for composite materials in ship structures.
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From page 116... ...
Duration 1,500 hours over ~ year 96M-W Analysis and Design Technology Development for Marine Composite Structures (95M-T) Objective Adapt and develop as required, current analysis and design techniques, methodologies, and practices to permit composite materials to become a practical and cost-effective option for the construction of ships and offshore-platform structural components.
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, and commercial marine vessels can benefit from increased usage of composite materials. In order to evaluate the use of composite materials, it is necessary to develop analytical and design techniques specific to the needs of marine structures.
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Phase 3 Design Studies · Exercise the analytical tools adapted from aerospace and automotive experience and developed in Phase 2 above to study critical design issues identified in Phase I Duration Phase 1: 2,000 labor hours over ~ year Phase 2: 2,000 labor hours over ~ year Phase 3: 2,000 labor hours over ~ year ~8
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