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Finite element analysis of a subsurface crack on the
) R; J+ Y! x: h6 Minterface of a coateh material under a moving
; F5 _) ? J# b/ }, [# L3 t: _! acompressive load
4 ?$ w) y& a, ]117$ E& l( B& D+ w* p" P. }
K S. Leea**, J. T. Jinn” and Y. Y. Earmmeb
/ |0 K3 K9 G) I1 s6 f! V4 s“Department of Mechanical Engineering, University of ULran, San 29, Mugeodong, Namgu, Ulsan. u3 v& }* p# V& P* ]+ N
Gyeongnam, 680-749 Seoul (Korea)% c$ v( H( @4 d
“Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology,) p2 w+ B' d6 {" O
Seoul (Korea)
- d+ I. f7 ~/ L& \(Received July 11, 1991; revised and accepted, October 30, 1991)3 P. l) _) M* _% n. n! ^2 n; a. ]
Abstract
* y9 [( o- c6 T4 Q L5 r7 YA subsurface crack subjected to a moving compressive load is analysed with the finite
- ]# `- c. @+ {" J4 @element method (FEM) considering friction on the crack surface. By comparing the FEM: ^, Q0 n; Q/ H% Z/ ^
results with semianalytic results of the subsurface crack in a homogeneous medium, it is& N; i3 ]" }$ l( R
first verified that the present solution method gives a fairly good result. The fracture
) s* _4 x; h& }& K1 ^5 Rparameters for the subsurface crack on the interface of a coated material are then evaluated6 Q* u. }3 _) Z/ d
numerically for various cases such as different combinations of materials of the coating
- a& i( l2 n3 W1 |layer and the substrate, changes in the ratio of the length of the subsurface crack to the
, ?$ ]" a2 U B: H* [7 [: fthickness of the coating layer and changes in the coefficient of friction on the crack surface.: T; o! G c7 Q3 m# I, z3 Y& e0 V
The effects of the combination of materials, the geometry of the subsurface crack and the
7 j2 u$ \$ @4 n) _coefficient of friction on the fracture parameters are discussed. The conditions for the
% b# }# g m$ G3 X) ~5 i7 Asubsurface crack to propagate along the interface or to kink out of the interface are also7 r8 W* K8 ?/ t$ I
examined. |
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