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Fracture Mechanics: Fifteenth Symposium
ASTM Selected Technical Papers
Fracture Mechanics: Fifteenth Symposium
By
RJ Sanford
RJ Sanford
1Department of Mechanical Engineering,
University of Maryland
,
College Park, Maryland
;
symposium chairman and editor
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ISBN-10:
0-8031-0208-9
ISBN:
978-0-8031-0208-8
No. of Pages:
771
DOI:
https://doi.org/10.1520/STP833-EB
Publisher:
ASTM International
Publication date:
1984
eBook Chapter

Dynamic Crack Branching—A Photoelastic Evaluation

By
M Ramulu
M Ramulu
1
Research Assistant Professor, Professor, and Graduate Student
, respectively, Department of Mechanical Engineering,
University of Washington
,
Seattle, Wash. 98195
.
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,
AS Kobayashi
AS Kobayashi
1
Research Assistant Professor, Professor, and Graduate Student
, respectively, Department of Mechanical Engineering,
University of Washington
,
Seattle, Wash. 98195
.
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,
BS-J Kang
BS-J Kang
1
Research Assistant Professor, Professor, and Graduate Student
, respectively, Department of Mechanical Engineering,
University of Washington
,
Seattle, Wash. 98195
.
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Doi:
https://doi.org/10.1520/STP32553S
Page Count:
19
  • Published:
    1984

A necessary and sufficient condition for crack branching based on a crack branching stress intensity factor, KIb, accompanied by a minimum characteristic distance of rc is proposed. This crack branching criterion is evaluated by dynamic photoelastic experiments involving crack branching of six single-edged notch specimens and six wedge-loaded rectangular double cantilever beam specimens. Consistent crack branching at KIb = 2.04 MPa√m and rc = 1.3 mm verified this crack branching criterion. The crack branching angle predicted by this crack branching criterion agreed well with those measured in the crack branching experiments.

Keywords:
dynamic fracture, crack curving, crack branching, branching angle, critical radial distance, dynamic stress intensity factor, nonsingular stress, finite element method, fracture (materials), crack propagation

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