Fracture initiation mechanisms in α -alumina under hypervelocity impact

Cheng Zhang; Rajiv K. Kalia; Aiichiro Nakano; Priya Vashishta

doi:10.1063/1.2786865

Fracture initiation mechanisms in α -alumina under hypervelocity impact

Cheng Zhang
, Rajiv K. Kalia
, Aiichiro Nakano
, Priya Vashishta

Research output: Contribution to journal › Article › peer-review

26 Scopus citations

Abstract

Atomistic mechanisms of crack initiation and fracture in α -alumina under hypervelocity impact are investigated using large-scale molecular-dynamics simulations involving 540× 106 atoms. The simulations reveal crack initiation due to amorphization, structural phase changes, and interaction between high strain rate deformation modes, which can advance at sustained speeds of 8 kms. Fracture toughness in the impact-damaged substrate is estimated to be around 2 MPam. Spallation at the interface of the amorphous region and twins causes eventual failure. The favorable cleavage planes normal to basal planes are found to be {2 1- 1- 0}. © 2007 American Institute of Physics.

Original language	English
Journal	Applied Physics Letters
Volume	91
Issue number	12
DOIs	https://doi.org/10.1063/1.2786865
State	Published - Sep 28 2007
Externally published	Yes

Access to Document

10.1063/1.2786865

Cite this

@article{1a884fd498214d0f8ffaad3c6ab13352,

title = "Fracture initiation mechanisms in α -alumina under hypervelocity impact",

abstract = "Atomistic mechanisms of crack initiation and fracture in α -alumina under hypervelocity impact are investigated using large-scale molecular-dynamics simulations involving 540{\texttimes} 106 atoms. The simulations reveal crack initiation due to amorphization, structural phase changes, and interaction between high strain rate deformation modes, which can advance at sustained speeds of 8 kms. Fracture toughness in the impact-damaged substrate is estimated to be around 2 MPam. Spallation at the interface of the amorphous region and twins causes eventual failure. The favorable cleavage planes normal to basal planes are found to be \{2 1- 1- 0\}. {\textcopyright} 2007 American Institute of Physics.",

author = "Cheng Zhang and Kalia, \{Rajiv K.\} and Aiichiro Nakano and Priya Vashishta",

year = "2007",

month = sep,

day = "28",

doi = "10.1063/1.2786865",

language = "English",

volume = "91",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

number = "12",

}

TY - JOUR

T1 - Fracture initiation mechanisms in α -alumina under hypervelocity impact

AU - Zhang, Cheng

AU - Kalia, Rajiv K.

AU - Nakano, Aiichiro

AU - Vashishta, Priya

PY - 2007/9/28

Y1 - 2007/9/28

N2 - Atomistic mechanisms of crack initiation and fracture in α -alumina under hypervelocity impact are investigated using large-scale molecular-dynamics simulations involving 540× 106 atoms. The simulations reveal crack initiation due to amorphization, structural phase changes, and interaction between high strain rate deformation modes, which can advance at sustained speeds of 8 kms. Fracture toughness in the impact-damaged substrate is estimated to be around 2 MPam. Spallation at the interface of the amorphous region and twins causes eventual failure. The favorable cleavage planes normal to basal planes are found to be {2 1- 1- 0}. © 2007 American Institute of Physics.

AB - Atomistic mechanisms of crack initiation and fracture in α -alumina under hypervelocity impact are investigated using large-scale molecular-dynamics simulations involving 540× 106 atoms. The simulations reveal crack initiation due to amorphization, structural phase changes, and interaction between high strain rate deformation modes, which can advance at sustained speeds of 8 kms. Fracture toughness in the impact-damaged substrate is estimated to be around 2 MPam. Spallation at the interface of the amorphous region and twins causes eventual failure. The favorable cleavage planes normal to basal planes are found to be {2 1- 1- 0}. © 2007 American Institute of Physics.

UR - https://www.scopus.com/pages/publications/34648819031

U2 - 10.1063/1.2786865

DO - 10.1063/1.2786865

M3 - Article

SN - 0003-6951

VL - 91

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 12

ER -

Fracture initiation mechanisms in α -alumina under hypervelocity impact

Abstract

Access to Document

Fingerprint

Cite this