ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Field tests show that cracks can propagate steadily at more than 300 m sec−1 along gas-pressurized pipelines of normally ductile polyethylene, once initiated by impact. Although the determination of safe operating conditions demands a knowledge of the pipe material's resistanceR to such high-velocity cracks, devising an appropriate small-scale test presents major problems. Instrumented drop-weight testing of double torsion specimens offers a promising solution: constant-velocity brittle crack propagation is observed and, since the static deformation mode remains admissible in the dynamic régime, a simple analysis is possible. From displacement data, this provided quite consistent results up to 200 m sec−1 crack velocity, whilst load measurements were more affected by transient torsional wave propagation. A simple dynamic analysis satisfying more boundary conditions supports the displacement-based quasi-static results, and offers to extend the method to higher crack velocities.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01103556
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