Tip (image) Weizmann Institute of Science Share Print E-Mail Caption The trajectory of a crack tip, showing one cycle of oscillation. The horizontal wavy line shows the trajectory of the crack tip. Credit Weizmann Institute of Science Usage Restrictions None Share Print E-Mail 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.