The chevron notched drop-weight-tear-test specimen

Technical Report · Sat Sep 01 04:00:00 EDT 1990

OSTI ID:5787236

Maxey, W A; Barnes, C R

A search for a new type of notch for the standard drop-weight-tear-test (DWTT) specimen has been completed. This new notch specimen is to replace the precracked DWTT specimen which has been shown to predict full-scale behavior but has received little support from pipe manufactures. The new notch is a chevron notch causing fracture initiation to occur at a machined point located at mid-well thickness and about 0.2 inch below the specimen edge (i.e., at the same depth as the pressed-in notch of the standard DWTT). No precracking or other severe prestraining, which may create strain aging problems, is required to produce the specimen. A good correlation was obtained between the chevron-notched DWTT and the Charpy V-notch specimens for conventionally rolled steels; this correlation effectively ties the chevron notched data to past fracture research data and to published correlations that describe fracture in terms of Charpy upper-shelf energy. A procedure is included (appendix) for preparing and conducting the Chevron notched DWTT. 22 refs., 14 figs., 4 tabs.

• Research Organization: Battelle, Columbus, OH (USA)
• Sponsoring Organization: AGA; American Gas Association, Inc., Arlington, VA (USA)
• OSTI ID: 5787236
• Report Number(s): NG-18/190
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
032000* -- Natural Gas-- Transport
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36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
42 ENGINEERING
420500 -- Engineering-- Materials Testing
ALLOYS
CHARPY TEST
CRACKS
DESTRUCTIVE TESTING
IMPACT TESTS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
PIPES
SAMPLE PREPARATION
STEELS
TESTING