habras purunemine polükristallilises materjalis, mille korral pragu läheb kristallide/terade vahelt (vt terapiir, habras purunemine, teraline murd; vrd terasisene purunemine), a brittle fracture of a polycrystalline material in which the fracture is between the grains or crystals, that forms the material (see: grain boundary, brittle fracture, granular fracture area; compare: transgranular fracture)