Chandrasekar Wear (IMAGE) Purdue University Caption This sequence of images reveals surprising fluid-like behavior in a solid piece of metal sliding over another, forming defects leading to wear in metal parts. (Top) Two image frames of the material flow showing how these defects are spawned in the wake of the contact. (Bottom) Scanning electron microscope pictures of the corresponding wear surfaces showing a tear and a crack. Wear particles are formed when the tears and cracks detach from the surfaces. Credit (Purdue University School of Industrial Engineering image/Anirban Mahato) Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.