The development and growth of the curved crack front in a double-torsion fracture-mechanics specimen is investigated by direct observation of crack propagation during the test. The crack front motion is analysed from a video-recording of the fracture test, and three distinct stages of crack propagation are identified. This work shows some of the requirements for the application of conventional double-torsion analysis to this test configuration: the material characteristic -critical strain energy release rate as a function of crack velocity - can be correctly obtained, provided that three steady-state conditions (static, kinematic and dynamic) are all fulfilled.
An Evaluation of Double Torsion Testing of Polymers by Visualization and Recording of Curved Crack Growth
FRASSINE, ROBERTO;RINK SUGAR, MARTA ELISABETH;PAVAN, ANDREA
1988-01-01
Abstract
The development and growth of the curved crack front in a double-torsion fracture-mechanics specimen is investigated by direct observation of crack propagation during the test. The crack front motion is analysed from a video-recording of the fracture test, and three distinct stages of crack propagation are identified. This work shows some of the requirements for the application of conventional double-torsion analysis to this test configuration: the material characteristic -critical strain energy release rate as a function of crack velocity - can be correctly obtained, provided that three steady-state conditions (static, kinematic and dynamic) are all fulfilled.| File | Dimensione | Formato | |
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An evaluation of double torsion testing of polymers.pdf
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