The influence of physical properties and spraying parameters on the creation of residual thermal stresses during the spraying process

Elsing, R.; Knotek, O.; Balting, U.

doi:10.1016/0257-8972(90)90163-7

Cited by 28 publications

(2 citation statements)

References 7 publications

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“…On the other hand, the fact that the temperature of the Al 2 O 3 particles is well below their melting point in the DSC processes, resulted in a shot peening effect during the impact of each Al 2 O 3 particle on the substrate and thus a compressive stress is generated in the coating. In contrast, in the case of APS, the solidification of the molten Al 2 O 3 upon impacting the substrate causes a tensile residual stress, often called the quenching stress [17][18][19]. Finally, HA coatings are always characterized by a tensile residual stress [20] since it does not experience any phase transformation during the coating process unlike in the case of MAO coatings.…”

Section: Mechanical Behaviourmentioning

confidence: 98%

The influence of the coating technique on the high cycle fatigue life of alumina coated Al 6061 alloy

Sundararajan

Wasekar

Ravi

2010

Trans Indian Inst Met

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The primary objective of this study is to evaluate the influence of coating technique on the high cycle fatigue of an Al6061 alloy. Towards this purpose, Al6061 alloy fatigue samples have been coated with Al 2 O 3 utilising the detonation spray, air plasma spray, micro arc oxidation and hard anodizing techniques. The high cycle fatigue life of these coated samples has been evaluated over a range of alternating stress values and compared with the fatigue life of the uncoated Al6061 alloy. It is observed that the detonation spray coated sample exhibits a higher fatigue life than the uncoated sample. In contrast, the samples coated using the other techniques exhibit poorer fatigue life compared to the uncoated sample especially at lower alternating stress values. These results have been explained on the basis of the nature of the coatingsubstrate interface which is strongly determined by the coating technique used to deposit the Al 2 O 3 coatings.

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Section: Mechanical Behaviourmentioning

confidence: 98%

The influence of the coating technique on the high cycle fatigue life of alumina coated Al 6061 alloy

Sundararajan

Wasekar

Ravi

2010

Trans Indian Inst Met

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“…According to methods 2 and 3, the unknown elastic modulus can be obtained by solving the equation Young's modulus of the coating can also be deduced by the first natural bending frequency. When this technique (method 5) is adopted, the specimen is usually supported so as to produce a free-body vibration, 17'18 and the first natural bending frequency f is given by f = 2rcL~ (12) where ~ = 4.73004, L is the specimen length and m is the specimen mass.…”

Section: Elastic Modulus Evaluationmentioning

confidence: 99%

Measurement of coatings' elastic properties by mechanical methods: Part 1. Consideration on experimental errors

Beghini

Bertini

Frendo

2001

Experimental Mechanics

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ABSTRACT--A critical analysis of some mechanical methods employed for measuring the elastic properties of coatings is presented. A rational basis for properly choosing test methods, transducers and layer thicknesses is provided. The analyzed methods, usually applied to relatively thick coatings, include four-point bending tests and the resonance technique. General relationships for the evaluation of coatings' elastic properties, derived from the multUayer beam and plate theories, are discussed. On the basis of the error propagation theory, for different combinations of materials and layer thicknesses, the influence of typical experimental errors, test setup parameters and material properties is analyzed, and sensitivity coefficients for relative errors are discussed. The critical experimental variables and their effect on measurement accuracy are highlighted, suggesting suitable conditions for selecting specimen geometry and testing conditions. A procedure for measurement at high temperature is outlined.KEY WORDS--Coatings, elastic modulus, sensitivity analysis, experimental errors Nomenclature X, Y, Z = Cartesian coordinate system ~X, E:y, ~Z = normal strains ~x, cry, cr z = normal stresses hk = thickness of the kth layer lk = z-coordinate of the kth layer's centroid Ik-1 = z-coordinate of the inferior surface of the kth layer lie = z-coordinate of the superior surface of the kth layer gk = depth coordinate of the kth layer centroid, with reference to the geometric center of the specimen B = specimen width H = total specimen thickness K}, = specimen bending stiffness in the Rx, Ry = radii of curvature of the specimen geometrical axis in the Z-X and Z-Y planes Cx, Cy = normal strains of the centroid fiber in the Z-X and Z-Y cross sections 8 = position, in the beam model, of the neutral axis related to the geometric centroid of the specimen L = total specimen length S = inner spacing between the loading pins in the FPB test a = spacing between the inner and outer loading pins in the FPB test P = half load, applied in the FPB test Es, Ec = elastic modulus of the substrate and coating materials hs, hc = thickness of the substrate and coating layers ~s, ec = measured longitudinal strain on the external coating surface and substrate surface w = midsection displacement, related to the fixed external loading pins k = distance of the measuring gage from the neutral axis of the specimen f = first bending resonance frequency of the specimen = 4.73004 m = mass of the specimen = ratio of the transverse to the longitudinal strain measured on the external specimen surface F = ratio of the longitudinal strains measured on the substrate and coating surfaces R = ratio of the substrate to the coating thickness cz = ratio of the coating to the substrate elastic modulus Pe,.c = slope of the experimental regression line correlating the measured load and strain on the substrate or coating surfaces Pw = slope of the experimental regression line correlating the measured load and midsection displacement = relationship giving the coating ...

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Residual Stresses in Thermal Spray Coatings and Their Effect on Interfacial Adhesion: A Review of Recent Work

Clyne

Gill

1996

JTST

430

159

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The influence of physical properties and spraying parameters on the creation of residual thermal stresses during the spraying process

Cited by 28 publications

References 7 publications

The influence of the coating technique on the high cycle fatigue life of alumina coated Al 6061 alloy

The influence of the coating technique on the high cycle fatigue life of alumina coated Al 6061 alloy

Measurement of coatings' elastic properties by mechanical methods: Part 1. Consideration on experimental errors

Residual Stresses in Thermal Spray Coatings and Their Effect on Interfacial Adhesion: A Review of Recent Work

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