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Development of an Extended Compact Crack Arrest Specimen
Last modified: 2013-05-07
Abstract
The compact crack arrest specimen is the standard specimen geometry used for
crack arrest testing in ASTM E1221. Many crack arrest tests are invalid because
of crack branching or otherwise leaving the intended crack plane during rapid
crack propagation. An extended compact specimen geometry was developed to
decrease the magnitude of the positive T-stress and improve the crack path
stability. Finite element analysis was performed to determine a suitable
compliance calibration of the specimen and to characterize the T-stress in the new
specimen. Results of the compliance calibration and the experimental validation
are presented. The T stress was reduced by 50% in the new specimen compared
with the standard compact specimen. A series of crack arrest tests were
performed using the standard compact crack arrest specimen and the extended
specimen geometry.
crack arrest testing in ASTM E1221. Many crack arrest tests are invalid because
of crack branching or otherwise leaving the intended crack plane during rapid
crack propagation. An extended compact specimen geometry was developed to
decrease the magnitude of the positive T-stress and improve the crack path
stability. Finite element analysis was performed to determine a suitable
compliance calibration of the specimen and to characterize the T-stress in the new
specimen. Results of the compliance calibration and the experimental validation
are presented. The T stress was reduced by 50% in the new specimen compared
with the standard compact specimen. A series of crack arrest tests were
performed using the standard compact crack arrest specimen and the extended
specimen geometry.
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