Linear Elastic Fracture Toughness (K sub Ic) and Dynamic Tear Transition

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Authors
  1. Roy, V.
  2. KarisAllen, K.
  3. Matthews, J.R.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
The design of a modern 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. The results show that the transition curve is a useful guide to establish a temperature range where a valid plane strain test will exist. Lower shelf is not necessarily plane strain. TRUNCATED
Keywords
Dynamic tear
Report Number
DREA-SR-1999-162-PAP-25 — CONTAINED IN CA000150
Date of publication
01 Oct 1999
Number of Pages
23
DSTKIM No
CA000175
CANDIS No
511899
Format(s):
Hardcopy;Document Image stored on Optical Disk

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