Accession Number:

ADA158967

Title:

Quality Assessment of Glass Reinforced Plastic Ship Hulls in Naval Applications. Course XIII-A.

Descriptive Note:

Master's thesis,

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF OCEAN ENGINEERING

Personal Author(s):

Report Date:

1985-06-01

Pagination or Media Count:

237.0

Abstract:

Important features of a Quality Assurance QA plan which could support a lower factor of safety structural design are explored. A survey of industry QA plans was used to identify significant management attributes. A methodology to develop important technical attributes and effectively engineer the QA plan to any GRP ship is presented. This methodology is then applied to a specific ship. A recent feasibility design of an advanced Minewarfare Ship MWSX, which was performed by the authors, is used as the example. The effect, detection and evaluation of defects is emphasized. Using existing models and a fracture mechanics analysis, the effects of key defects have been quantified. Cracks in the edges of hull penetrations are shown to be critical defects that have not previously been considered for typical design loadings is demonstrated. This equivalency is important in order to correctly proportion the efforts to control and correct defects. An integrated detection plan is proposed. Several testing and monitoring techniques are combined during various stages of construction and during the life of the ship. Unique aspects of this plan are the use of a bending proof test on a full scale prototype hull and the use of acoustic emission as a continuous, in service monitoring technique. Example evaluations of typical defects are made based on current standards and procedures. The results are compared for consistency to the estimates of the effects of defects previously derived.

Subject Categories:

  • Laminates and Composite Materials
  • Marine Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE