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 A technique is described which takes advantage of the good thermal insulation properties of polymers and their tendency to become embrittled when cooled to low temperatures and so make crack initiation in an embrittled part of a specimen a simple process. In many tests, the practice is to initiate a crack in a specimen of polymer or similar material by using an impacting device that also applies dynamically a three-point bend. A problem with this approach can be in determining how much the crack initiation and propagation is due to the strong transient forces relative to the bending or other dynamic loading. As the toughness, dynamic and other properties of materials are improved and hence higher impact velocities are required, so this factor becomes more difficult to resolve. Thus, there is increasing interest in different arrangements for testing these new materials that avoid transient impact problems, and also to provide better information concerning the threshold load for crack propagation and related factors. On-specimen gauges are used for some of these studies.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00576522
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