What is it about?
The geometry of a thin specimen with dog bone shape is developed using finite element analysis to guarantee that cracking occurs within the strain measuring zone. The steps for fabrication of specimens and avoiding eccentricity are presented as well as preliminary results
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Why is it important?
Current uniaxial fatigue tests generally result in end failures which invalidate the test results. This avoid wasting resources. Furthermore, in addition to laboratory test specimens, field specimens created from 6 inch (150 mm) cores can also be tested.
Perspectives
When I started performing uniaxial fatigue testing of asphalt concrete my goal was to characterize asphalt concrete mixes at high temperatures (representative of where I live). However, it soon became evident that end failures due to strain concentrations at the interface with the loading plates and load eccentricity were very common. After developing a technique to alter cylinders to dog bone shape, it became evident that the process was too laborious and not applicable to field specimens. This research avoids this two issues while overcoming end failures, even at the high temperatures at which these are more likely to occur. The preparation times for these specimens are comparable to those of cylindrical specimens.
Adrian Archilla
University of Hawaii at Manoa
Read the Original
This page is a summary of: A Novel Test Specimen Geometry for Uniaxial Fatigue Testing of Asphalt Concrete, Journal of Testing and Evaluation, February 2019, ASTM International,
DOI: 10.1520/jte20180564.
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