Week Four

We have been working on testing the stretchability of our DP980 specimens. To do this we have to prepare the samples by:

• Polishing the scrap edge (helps ensure that the crack propagates from sheared edge) 
• Etching a 1mm grid 
• Measuring the width and thickness 
• Painting a black and white speckle on the non etched side  

Next we preform the stretchability test using a tensile testing machine equipped with DIC technology that is used to track the painted speckles.