Anisotropic fracture in nacre-like alumina

被引：12

作者：

Duminy, Thomas ^{[1
,2
,3
]}

Henry, Ronan ^{[1
]}

Adrien, Jerome ^{[1
]}

Doitrand, Aurelien ^{[1
]}

Meille, Sylvain ^{[1
]}

机构：

[1] Uni Lyon, INSA Lyon, UCBL, MATEIS UMR CNRS 5510, F-69621 Villeurbanne, France

[2] 345 Ave Gaston Berger, F-69100 Villeurbanne, France

[3] Univ Rouen, Normandie Univ, INSA Rouen, CNRS,Grp Phys des Materiaux, F-76000 Rouen, France

来源：

THEORETICAL AND APPLIED FRACTURE MECHANICS | 2023年 / 123卷

关键词：

Finite fracture mechanics; Nacre-like alumina; Crack initiation; Anisotropy; NOTCH-ROOT RADIUS; CRACK INITIATION PREDICTION; MECHANICAL-PROPERTIES; COUPLED CRITERION; TOUGHNESS; STRENGTH; STRESS; COMPOSITES; SPECIMENS; CERAMICS;

D O I：

10.1016/j.tafmec.2022.103710

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Fracture in nacre-like alumina is studied experimentally and numerically with alumina platelets main alignment direction perpendicular (along-configuration) to the one commonly tested (across-configuration) in the literature. In along-configuration, brittle failure is noted after crack initiation with no macroscopic crack deviation, unlike what is observed in across-configuration. However, NLA exhibits in along configuration initiation critical stress intensity factor KIc = 5.3 +/- 0.5 MPa m1/2 , in the same order of magnitude as in across-configuration. The increase in KIc compared to monolithic alumina can be explained by a phenomenon of crack initiation containment at the interface between platelets. Unstable crack propagation occurs just after initiation, mainly following the platelet interfaces which results in crenelated fracture surfaces with crack decentering with respect to the initial notch tip.

引用

页数：12

共 51 条

[1] Anisotropy effect of bioinspired ceramic/ceramic composites: Can the platelet orientation enhance the mechanical properties at micro- and submicrometric length scale? [J].