Abstract
A new method of investigating the portion of plastic deformation during fatigue tests of copper samples has been developed. Until now plastic deformation could only be estimated as opposed to being directly measured. Cholesteric li-crystals were applied to the sample surfaces before the fatique test and the temperature distribution during deformation was measured by the change in colour of these crystals. This then allows the distribution of the plastic deformation along the sample to be calculated. Film recordings of the colour, and hence the temperature change showed that plastic deformation is spread along the sample in a manner similar to that predicted by theory; plastic deformation is not mainly concentrated in the middle of a specimen.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
