Elastic deformation continues until the yield stress of the material if it is ductile, after which the material plastically deforms. A brittle material fractures before any plastic deformation occurs ...
Because of their very large molecular weight (~ 10 6) polymers behave differently from the low molecular weight metals during plastic deformation leading to a ductile fracture. The top diagram shows a ...
Anthony Seret, of France's Laboratoire Lagrange at the Université Côte d'Azur, suggest that both plastic deformation and fragmentation of chondrules can occur at low collision velocities.