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Manufacturing Technology for Submarine Structures

Objective

Develop and demonstrate the technology that will allow the use of optimized weld assemblies for improved productivity, cost reduction, and structural integrity of Navy submarine nonpressure hull (NPH) structures. Evaluate new fastener materials.

Technical Approach

* Confirm structural performance requirements and criteria based on component stiffness, rupture, fracture, and fatigue * Provide analytical tools to evaluate manufacturing process parameters for NPH structures * Evaluate contributing factors and the interrelationship of these factors to the manufacturing process parameter selection * Evaluate an improved high-strength fastener material * Evaluate modified MP-159 material properties for use as a submarine fastener

Benefits

The use of optimized weld assemblies will result in a $4-million cost avoidance per submarine, lighter weight (up to 20-percent reduction) structural components for the New Attack Submarine (NSSN), lower costs for thinner structural elements, and increased performance of a lighter-weight submarine. Use of a more reliable high-strength, corrosion-resistant fastener material will improve life-cycle cost by $880,000 per year for the NSSN fleet.

Implementation

The resulting technology was transferred through close cooperation with Naval Sea Systems Command (NAVSEA), Naval Surface Warfare Center-Carderock, MD (NSWC-CD), Electric Boat to coordinate testing and disseminate results. Specification and design data sheet changes will be initiated by NAVSEA to incorporate undermatched weldments, as needed, for NPH NSSN components. The NCEMT has disseminated the project findings through published articles, deliverable reports, presentations at conferences, NCEMT and Manufacturing Technology (MANTECH) publications, and a project description added to the NCEMT website (www.ncemt.ctc.com).

Status

Completed