Catastrophic failure of nacre under pure shear stresses of torsion.
Sci Rep
; 7(1): 13123, 2017 10 13.
Article
em En
| MEDLINE
| ID: mdl-29030583
ABSTRACT
Nacre, a composite made from biogenic aragonite and proteins, exhibits excellent strength and toughness. Here, we show that nacreous sections can exhibit complete brittle fracture along the tablet interfaces at the proportional limit under pure shear stresses of torsion. We quantitatively separate the initial tablet sliding primarily resisted by nanoscale aragonite pillars from the following sliding resisted by various microscale toughening mechanisms. We postulate that the ductility of nacre can be limited by eliminating tablet interactions during crack propagations. Our findings should help pursuing further insights of layered materials by using torsion.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Nácar
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article