Nonlocal fracture analysis of an interface crack between a functionally graded coating and a homogeneous substrate under thermal loading

2021 ◽  
Vol 257 ◽  
pp. 113096
Author(s):  
Wenzhi Yang ◽  
Amin Pourasghar ◽  
Zengtao Chen
Keyword(s):  
Interface Crack ◽  
Thermal Loading ◽  
Fracture Analysis ◽  
Functionally Graded ◽  
Functionally Graded Coating ◽  
Graded Coating

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.

Influence of Material Continuity of Functionally Graded Coating on Interface Crack

2012 ◽  
Vol 503-504 ◽  
pp. 760-763 ◽  
Author(s):  
Chang Qing Sun ◽  
Hua Wei ◽  
Hong Gao
Keyword(s):  
Elastic Modulus ◽  
Interface Crack ◽  
Fracture Resistance ◽  
Base Material ◽  
Functionally Graded ◽  
Functionally Graded Coating ◽  
Fracture Behaviors ◽  
Graded Coating ◽  
Practical Engineering ◽  
Functionally Graded Layer

In this paper, aiming at three material parameter functions of functionally graded coating (FGC) which have different continuities, the influence of functionally gradient coating material continuity on the fracture behaviors of the crack on the interface between the base material and coating is studied. The results show that when the functionally graded coating structure is under a tension load, if the ratio of maximum elastic modulus of the FGC to the elastic modulus of the base is less than 10, the functionally graded layer which has C02 continuity can help to improve the fracture resistance of the interface crack, and if the ratio increases continuously, the functionally graded layer which has C13 continuity can help to improve the fracture resistance of the interface crack, which is of great guiding significance for practical engineering design.

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