Summary of Main Results (IMAGE) Queen Mary University of London Caption (a) Staggered fibrillar configuration and damageable mode II interface are responsible for hysteretic stress strain curve and heterogeneous fibrillar deformation. (b) The inclusion of staggered configuration and undamageable interface leads to hysteresis and homogeneous fibril deformation. (c) Aligned fibrillar configuration and no interface lead to no hysteresis and homogeneous fibril deformation. Credit QMUL 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.