The effect of crack size on the buckling delamination mode (surface wrinkles) of a piezoelectric sandwich rectangular thick plate with interface edge cracks

2018 ◽  
Author(s):  
Fatih Aylıkcı ◽  
Nazmiye Yahnioğlu
Keyword(s):  
Thick Plate ◽  
Crack Size ◽  
Buckling Delamination ◽  
Edge Cracks ◽  
Interface Edge

scholarly journals Fatigue Life Appraisal and Its Corrected Stress Intensity Factor for Repaired Off-CentrallyCracked Aluminum Plates

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4014
Author(s):  
Xiang You ◽  
Zhiyu Wang ◽  
Xiafang Zhou ◽  
Zifeng Liu ◽  
Ruijuan Jiang ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Element Model ◽  
Crack Size ◽  
Plate Edge ◽  
Life Estimation ◽  
Fatigue Life Estimation ◽  
Life Improvement ◽  
Edge Cracks ◽  
Aluminum Plates ◽  
Sensitive Parameters

This paper presents an experimental study on the fatigue life estimation of off-centrally cracked aluminum plates. Typical theoretical equations for off-central, central and edge cracks were reviewed and compared in terms of their sensitive parameters and applicability. A finite element model has been validated in its capacity in modelling the influences of eccentricity and crack size on the boundary correction coefficients. The Forman equation has been employed along with numerical results for the prediction of fatigue lives. Based on the test data, the fatigue life results of aluminum plates with and without patched laminate repair have been compared with codified fatigue classes. It is demonstrated that the repair at the crack tip close to the plate edge is effective in the fatigue life improvement for off-centrally crackedaluminum plates.

Buckling Delamination of a Rectangular Sandwich Thick Plate With Band Cracks

2010 ◽  
Author(s):  
Surkay Akbarov ◽  
Nazmiye Yahnioglu ◽  
Ayfer Tekin
Keyword(s):  
Thick Plate ◽  
Compressive Loading ◽  
Three Dimensional ◽  
Initial Imperfection ◽  
Core Layer ◽  
Solution Procedure ◽  
Critical Force ◽  
Geometrical Parameters ◽  
Field Equations ◽  
Buckling Delamination

The buckling delamination around the band cracks contained with the simply supported all edge-surface rectangular sandwich thick plate is investigated. It is assumed that the sandwich plate is composed of two face layers and a core layer. Face and core layers are made of different materials and it is assumed that there are two same cracks at the interfaces between the layers. Material of each layer is isotropic and homogeneous. For the solution procedure it is supposed that the surfaces of the cracks have insignificant initial imperfections. The development of this initial imperfection with an external compressive loading acting along the cracks is studied in the framework of the three dimensional geometrically nonlinear field equations of the elasticity theory and the piece-wise homogeneous body model. For the determination of the values of the critical force the initial imperfection criterion i.e. the case where the imperfection starts to increase and grows indefinitely, is used. The corresponding boundary value problems are solved by employing the boundary form perturbation techniques and the three dimensional FEM. The numerical results on the critical force are presented and analyzed. The influences of the material and geometrical parameters on these critical values are discussed.

Initiation of Surface and Interface Edge Cracks in Functionally Graded Ceramic Thermal Barrier Coatings

1997 ◽  
Vol 119 (2) ◽  
pp. 148-152 ◽  
Author(s):  
Klod Kokini ◽  
Michael Case
Keyword(s):  
Thermal Barrier Coatings ◽  
Thermal Stresses ◽  
Functionally Graded ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
Surface And Interface ◽  
Probability Of Survival ◽  
Edge Cracks ◽  
Plasma Sprayed ◽  
Interface Edge

The initiation of surface and interface edge cracks in functionally graded ceramic thermal barrier coatings resulting from the application of a thermal load is studied. For a given specimen configuration, the singular behavior of the thermal stresses is analytically determined in terms of a singularity power β and pseudo-stress intensity factors K1 and K2. Crack initiation at the surface at the interface is related to the surface temperature and the temperature difference between the surface of the coating and the substrate. The experimental results are used to provide Weibull curves for the probability of survival of plasma sprayed mullite and CoCrAlY coating systems.

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