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The relationship between strain driven cracking and the mechanical properties of the materials has been reviewed by several authors.[289,290,291,292,293,294,295,296,297,299,303,304,305,306] Several of these papers, including the current paper, have pointed out the fact that in some alloys strain rates as slow as 10−8s−1 may be attained, comparable with the crack growth rates established for certain steels. This ‘super fast’ crack growth rate is often associated with the effects of crack localization and/or crack tip deceleration, mechanisms now believed to be controlled by temperature and activity of the grain boundaries.[302-316] These grain boundary mechanisms seem to be at play in the 5xxx alloys, as well as in other iron group alloys.[317-331]
Fatigue crack growth rates up to 10−8s−1, which are sometimes complex, can be measured in these materials by a number of techniques. ZIPTEX®, which is not a true fatigue crack growth rate test, was developed by Dufour et al.[324] They performed a variety of experiments and concluded that there was little difference between ZIPTEX and ISO 12855 (the two tests were identical except for the method of electrochemical weight change measurement) for fatigue crack growth rates in the 5xxx alloys, with the exception of IRIS that was more sensitive to accumulation of stresses during the test. As it involves passive electrochemical weight change only a small amount of stress is usually associated with the tests. ZIPTEX has the advantage that it can be used to test more complex crack morphology. Fatigue fatigue crack growth rates in some of the 5xxx alloys have been measured using electrochemical weight change techniques in the laboratory and under multidirectional fatigue loading in triaxial compression.[330-334]
As mobile phones became faster and more capable, an increasing number of new tasks were added, such as email, voice mail and games, that were not pre-installed on mobiles. Crack growth fatigue tests, using the Slow Strain rate to 600s−1, were carried out on six new phones to measure crack growth rates. 7211a4ac4a