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Effects of root radius, stress, crack growth and rate on fracture instability

Journal Article:

Abstract

Of various criteria for fracture at the root of a notch, the energy, local stress, and displacement criteria have limited validity. More appropriate is the history of both stress and strain over a small region ahead of the crack, as required for fracture by the coalescence of holes. Expressions are given for crack initiation, growth, and subsequent instability in anti-plane strain of a nonhardening material. Instability is shown to depend primarily on those strain increments arising from crack growth at constant load rather than on those from increasing load at constant crack length. Thus final instability conditions are similar for single and double- ended cracks, round notches, and cracks cut under constant load. Round notches may give instability, restabilization and final instability. The growth and coalescence of holes in front of a crack in a linearly viscous material is studied for both tensile and anti-plant-strain cracks. The absence of residual strain eliminates instability, but the crack continually accelerates. (26 refs.)
Authors:
Publication Date:
Jan 01, 1965
Product Type:
Journal Article
Reference Number:
EDB-81-084773
Resource Relation:
Journal Name: Proc. R. Soc. London, Ser. A; (United Kingdom); Journal Volume: 285:1400
Subject:
02 PETROLEUM; 03 NATURAL GAS; 36 MATERIALS SCIENCE; 58 GEOSCIENCES; ALLOYS; FRACTURING; MECHANICAL PROPERTIES; GEOLOGIC STRUCTURES; METALS; NATURAL GAS WELLS; OIL WELLS; STEELS; PIPELINES; COMMINUTION; ELEMENTS; IRON ALLOYS; IRON BASE ALLOYS; WELLS; 020300* - Petroleum- Drilling & Production; 030900 - Natural Gas- Artificial Stimulation, Plowshare- (-1989); 360103 - Metals & Alloys- Mechanical Properties; 580300 - Mineralogy, Petrology, & Rock Mechanics- (-1989)
OSTI ID:
6220275
Research Organizations:
Massachusetts Inst. of Tech.
Country of Origin:
United Kingdom
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: PRLAA
Submitting Site:
TUL
Size:
Pages: 58-72
Announcement Date:

Journal Article:

Citation Formats

McClintock, F A. Effects of root radius, stress, crack growth and rate on fracture instability. United Kingdom: N. p., 1965. Web.
McClintock, F A. Effects of root radius, stress, crack growth and rate on fracture instability. United Kingdom.
McClintock, F A. 1965. "Effects of root radius, stress, crack growth and rate on fracture instability." United Kingdom.
@misc{etde_6220275,
title = {Effects of root radius, stress, crack growth and rate on fracture instability}
author = {McClintock, F A}
abstractNote = {Of various criteria for fracture at the root of a notch, the energy, local stress, and displacement criteria have limited validity. More appropriate is the history of both stress and strain over a small region ahead of the crack, as required for fracture by the coalescence of holes. Expressions are given for crack initiation, growth, and subsequent instability in anti-plane strain of a nonhardening material. Instability is shown to depend primarily on those strain increments arising from crack growth at constant load rather than on those from increasing load at constant crack length. Thus final instability conditions are similar for single and double- ended cracks, round notches, and cracks cut under constant load. Round notches may give instability, restabilization and final instability. The growth and coalescence of holes in front of a crack in a linearly viscous material is studied for both tensile and anti-plant-strain cracks. The absence of residual strain eliminates instability, but the crack continually accelerates. (26 refs.)}
journal = {Proc. R. Soc. London, Ser. A; (United Kingdom)}
volume = {285:1400}
journal type = {AC}
place = {United Kingdom}
year = {1965}
month = {Jan}
}