Linear Elastic Fracture Toughness (KIc) and Dynamic Tear Transition

Abstract

The design of a modem warship is a very complex task. Some of the greatest concerns in the design are the selection of proper materials and welding techniques. The aim of the selection is to reach a design, which enables the whole structure to have a ductile behaviour under all operating conditions. This report concentrates on Linear Elastic (K type) tests at temperatures where the Dynamic Tear energy was less than 133 joules for a 16 mm specimen. 133 joules was selected since it has been suggested that nil ductility occurs at that point for a standard Dynamic Tear Specimen. A background on the subject at hand and a proposed new transition curve interpretation is given. The materials composition and the dynamic tear transition behaviour of three weldments and a Grade A steel chosen for testing are shown. Precracking and fracture toughness procedures are given. The fracture toughness experimental results are shown for all temperatures. A proposed relationship between the shear lip size and the critical plastic zone size is used to determine the validity of the results.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1999
Accession Number
AD1004979

Entities

People

  • J. R. Matthews
  • Ken Karisallen
  • Vincent Roy

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Buildings And Structures
  • Ductility
  • Engineering
  • Intensity
  • Materials
  • Nova Scotia
  • Physical Properties
  • Research Facilities
  • Standards
  • Thickness
  • Toughness
  • Transitions
  • Welding
  • Weldments

Fields of Study

  • Materials science

Readers

  • Electrical Engineering
  • Materials Science (Mechanical Engineering).
  • Systems Analysis and Design