Transient response of the crack-tip field in a magnetoelectroelastic half-space with a functionally graded coating under impacts

2008 ◽  
Vol 79 (12) ◽  
pp. 1099-1113 ◽  
Author(s):  
Xu-Long Peng ◽  
Xian-Fang Li
Keyword(s):  
Half Space ◽  
Transient Response ◽  
Crack Tip ◽  
Functionally Graded ◽  
Crack Tip Field ◽  
Functionally Graded Coating ◽  
Graded Coating

Stresses at the Interface between the Functionally Graded Coating and the Elastic Half-Space Caused by Spherical Indentation

2007 ◽  
Vol 345-346 ◽  
pp. 833-836 ◽  
Author(s):  
S.M. Aizikovich ◽  
L.I. Krenev ◽  
I.S. Trubchik
Keyword(s):  
Half Space ◽  
Elastic Properties ◽  
Layered Structures ◽  
Elastic Half Space ◽  
Functionally Graded ◽  
Shear Stresses ◽  
Functionally Graded Coating ◽  
Graded Coatings ◽  
Graded Coating ◽  
Functionally Graded Coatings

Recent advances in nanotechnology have revealed numerous new methods of manufacturing functionally graded coatings and materials, but progress in this field is limited by the lack of knowledge about the mechanical behavior of such structures. Existing models of the mechanics of layered structures are not generally adequate for this purpose, since functionally graded structures can exhibit both qualitative and quantitative behavioral differences in comparison with homogeneous or layered structures, particularly if there is a significant gradient of elastic properties in the coating. In applications, interest is focused mainly on the deformation fields and stresses inside the inhomogeneous material caused by the contact tractions. Stresses at the interface between the functionally graded coating and the elastic half-space are of particular interest because of their influence on the propagation of cracks and other defects on this interface. Shear stresses at this interface associated with rapid variation in elastic properties with depth are particularly dangerous because of potential delaminations. In their work the authors: • develop a precise mathematical model and of the computational methods which makes it possible to achieve stable numerical results while analyzing the mechanical properties of functionally graded coatings; • study the variation effect in elastic properties on the maximum stresses in the surface layers of materials with functionally graded coatings caused by indentation.

Torsion of a punch attached to transversely-isotropic half-space with functionally graded coating

2012 ◽  
Vol 61 ◽  
pp. 24-35 ◽  
Author(s):  
Andrey Vasiliev ◽  
Igor Sevostianov ◽  
Sergey Aizikovich ◽  
Yeau-Ren Jeng
Keyword(s):  
Half Space ◽  
Transversely Isotropic ◽  
Functionally Graded ◽  
Functionally Graded Coating ◽  
Graded Coating

Development of Functionally Graded Coating by Thermal Spray Deposition

2015 ◽  
pp. 121-162
Author(s):  
Jyotsna Dutta Majumdar ◽  
Indranil Manna
Keyword(s):  
Thermal Spray ◽  
Spray Deposition ◽  
Thermal Spraying ◽  
Chemical Vapor ◽  
Solid Substrate ◽  
Functionally Graded ◽  
Functionally Graded Coating ◽  
Energy Applications ◽  
Graded Coating ◽  
Gradient Coatings

Functionally Gradient Coatings (FGCs) are emerging materials with an improved service life and have a promising future for the production of (a) tailored components for applications subjected to large thermal gradients, (b) smart coating with improved corrosion and wear resistance, (c) improved fatigue wear, and (d) improved material structures for energy applications like batteries, fuel cells, etc. FGCs may be developed by physical/chemical vapor deposition, electro/electroless deposition, thermal spray deposition technique, etc. Thermal spraying refers to the technique or a group of techniques whereby molten or semi-molten droplets of materials are sprayed onto a solid substrate to develop the coating. In this chapter, detailed overviews of the development of functionally graded coating by thermal spray deposition techniques are presented. In addition, a few research results on the development of functionally graded coating for tribological and thermal barrier applications are presented.

Analysis on Functionally Graded Material Coating Interface Crack

2012 ◽  
Vol 602-604 ◽  
pp. 1596-1599
Author(s):  
Bo He ◽  
Chang Qing Sun
Keyword(s):  
Elastic Modulus ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Interface Crack ◽  
Functionally Graded ◽  
Physical Parameters ◽  
Mode I ◽  
Modulus Ratio ◽  
Functionally Graded Coating ◽  
Graded Coating

It is assumed that the physical parameters of functionally graded coating material accords with the variation of degree n polynomial, and based on this material model, the behavior of crack fracture on the interface of functionally graded coating is studied. The results show that when the functionally graded coating structure bears a tension load, stress intensity factors of mode I and mode II exist at the same time generally, and the intensity factor of mode I occupies a leading position all along. Besides, when the elastic modulus ratio of the base to the functionally graded coating top is 5 and the elastic modulus of functionally graded coating varies linearly, the stress intensity factor of interface crack is the smallest, and with the increasing of elastic modulus ratio, the optimal non-uniform parameter tends to be larger than 1.

Higher-Order Terms for the Mode-III Stationary Crack-Tip Fields in a Functionally Graded Material

2010 ◽  
Vol 78 (1) ◽  
Author(s):  
Linhui Zhang ◽  
Jeong-Ho Kim
Keyword(s):  
Functionally Graded Material ◽  
Crack Tip ◽  
Functionally Graded ◽  
Mode Iii ◽  
Stationary Crack ◽  
Crack Tip Field ◽  
Homogeneous Solutions ◽  
Variable Approach ◽  
Graded Material ◽  
Plane Displacement

This paper provides full asymptotic crack-tip field solutions for an antiplane (mode-III) stationary crack in a functionally graded material. We use the complex variable approach and an asymptotic scaling factor to provide an efficient procedure for solving standard and perturbed Laplace equations associated with antiplane fracture in a graded material. We present the out-of-plane displacement and the shear stress solutions for a crack in exponentially and linearly graded materials by considering the gradation of the shear modulus either parallel or perpendicular to the crack. We discuss the characteristics of the asymptotic solutions for a graded material in comparison with the homogeneous solutions. We address the effects of the mode-III stress intensity factor and the antiplane T-stress onto crack-tip field solutions. Finally, engineering significance of the present work is discussed.

Reciprocating Sliding Wear of Cu, Cu-SiC Functionally Graded Coating on Electrical Contact

2020 ◽  
Vol 29 (6) ◽  
pp. 3930-3940 ◽  
Author(s):  
Swastika Banthia ◽  
Mohammad Amid ◽  
Srijan Sengupta ◽  
Siddhartha Das ◽  
Karabi Das
Keyword(s):  
Sliding Wear ◽  
Electrical Contact ◽  
Functionally Graded ◽  
Functionally Graded Coating ◽  
Reciprocating Sliding ◽  
Graded Coating ◽  
Reciprocating Sliding Wear
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