Accession Number:

ADA276220

Title:

Evaluation of Nondestructive Inspection Techniques for Quality Control of Alumina-Ceramic Housing Components

Descriptive Note:

Final rept.

Corporate Author:

NAVAL COMMAND CONTROL AND OCEAN SURVEILLANCE CENTER RDT AND E DIV SAN DIEGO CA

Report Date:

1993-09-01

Pagination or Media Count:

76.0

Abstract:

Alumina-ceramic pressure housings have been shown to be feasible and cost-effective alternatives to housings made from more traditional materials such as steel, titanium, or aluminum. The high specific compressive strength, and high specific elastic modulus of alumina ceramic allow engineers to design pressure housings having weight-to-displacement ratios lower than 0.60 for a service depth of 20,000 feet while remaining neutrally buoyant. Titanium housings designed to the same requirements have weight-to-displacement ratios in excess of 0.85. Although the difference may, at first glance, seem negligible, it accounts for a tripling of the housing payload weight capacity when alumina ceramic is substituted for titanium. The transition of alumina-ceramic pressure housing components from the developmental stage to the operational environment brings on the requirement for the capability of nondestructively inspecting these components for gross fabrication flaws and for in-service damage which may have occurred. Various radiographic and ultrasonic inspection methods are evaluated and compared based on their ability to detect defects, determine defect location, and characterize defect size and shape in large alumina-ceramic components used for deep submergence pressure housing applications. Recommendations based on the findings of the study are made for the nondestructive inspection of alumina-ceramic components.

Subject Categories:

  • Ceramics, Refractories and Glass
  • Properties of Metals and Alloys
  • Submarine Engineering
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE