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 ...

In a semi-brittle state, rocks exhibit a combination of brittle and ductile deformation, which is the process where rocks change shape permanently by "flowing" or "bending" under stress.

"Also, the principles of ductile deformation during hot collisions ... temperature), the chondrules behaved like a solid with brittle deformation and cracking, whereas above this the chondrules ...