With the introduction of ISO 6892-1:2009, the principle of maintaining tight tolerances on the specimen strain rate during the test, to improve consistency of results, became more widely adopted. Previously, methods of this type had been mainly used within the aerospace industry. The method for maintaining the specimen strain rate in this manner is commonly referred to as “Method A”. The new ISO 6892-1:2009 standard supersedes both ISO 6892:1998 and EN 10002-1:2001, the testing procedures from these standards, stress rates with a strain rate limit, remained in what is known as “Method B”.
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Mechanical testing requirements for rebar can vary, but typically fall into the basic test categories of tensile, bend, compression, and fatigue. This document will focus primarily on the very common, yet sometimes challenging, tensile test.
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A guide that provides an overview of the requirements and important issues that arise when gripping composite laminate coupons, as well as to outline multiple gripping solutions.
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With new and advancing materials being developed every day, research and material testing has to adapt to keep up. For materials research current strain measurement techniques do not offer enough information about how failures occur, and so, engineers are looking for different methods. One such test technique is the use of Digital Image Correlation (DIC) in measuring full field strain over a materials surface.
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Gripping methods can significantly affect values and consistency of results in mechanical testing of composites. With a growing drive to measure and understand the dynamic behavior of composites, it is sometimes necessary to revisit previous methodologies for specimen gripping.
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During the European Congress on Composite Materials(ECCM16) seminar in Seville, Spain, Andrea Calzolari presented research that was carried out in cooperation with the University of Turin and the LIMA Corporate Group.
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