A continuing investigation into the stress field around two parallet-edge cracks in a finite body
represent and analyze the stress field around two parallel edge cracks in a finite body.
The Westergaard-Schwarz method combined with the local collocation method was used
to analyze different cases of two parallel edge cracks in a finite body. Using this method
a determination of when two parallel edge cracks could be analyzed as isolated single
edge cracks was determined
Numerical experimentation was conducted using ABAQUS. It was used to obtain
the coordinate and stress information required in the local collocation method. The
numerical models were created by maintaining one crack at a fixed length while varying
the length of the second crack as well as the separation distance of the two cracks. The
results obtained through the local collocation method were compared with the finite
element obtained J-Integrals to verify the accuracy of the results.
The results obtained in the analysis showed that the major factor in determining
when the second crack?s stress field has to be considered was the crack separation
distance. It was found that a reduction in the second crack?s length did not have a
significant effect on overall stress intensity factors of the fixed crack. A larger change in
the opening mode stress intensity factor can be seen by varying the crack separation
distance. As well as seeing a steady reduction in shear mode stress intensity factors as the
crack separation was increased. The results showed that after a certain crack separation
distance the two cracks could be analyzed separately without introducing significant
error into the stress field calculations.
Advisor:Hogan, Harry; Chona, Ravinder; Fry, Gary; Reddy, J. N.
School:Texas A&M University
School Location:USA - Texas
Source Type:Master's Thesis
Keywords:stress intensity factors j integrals parallel cracks
Date of Publication:12/01/2004