Determination of Residual Stresses in Coatings and Coated Parts
| dc.contributor.author | Kõo, Jakub | |
| dc.date.accessioned | 2018-02-12T10:01:40Z | |
| dc.date.available | 2018-02-12T10:01:40Z | |
| dc.date.issued | 1994 | |
| dc.description.abstract | The methods of experimental residual stress analysis in coatings available at present are indirect. A distinct deformation parameter of a substrate or a coating should always be measured, from which the values of residual stresses can be calculated. At the same time, distinction should be made between layer-growing (nondestructive) and layer-removing (destructive) measurement methods. In the case of growing methods, a deformation parameter is measured by applying a coating a coating to the substrate, while in the case of layer-removing methods, by removing it from the substrate. G. Stoney was the first to use a layer-growing method for determination of residual stress in galvanic coatings. By using his method (proposed in 1909), residual stress in a coating is calculated by the curvature measured during the unilateral coating of a free straight strip substrate assuming a one-dimensional state of stress. In the course of time various layer-growing methods have been developed for determination of residual stresses in coatings. Still, layer-removing methods are also applied for determination of residual stresses in coatings. It has been established that layer-growing and layer-removing methods can be described by a single algorithm. Algorithms of this kind have been developed by the author of this thesis for a free plate with a unilateral coating, for a hollow cylinder and for a hollow sphere with an outer coating. This thesis summarizes the research conducted by the author and the coauthors in the field of experimental mechanics of residual stresses in coatings and coated parts between 1965 and 1994. The thesis contains the following sections: 1. Determination of residual stresses in coated parts: general algorithm; 2. Determination of residual stresses in bars, plates, cylinders and spheres with a thick coating; 3. Methods for determination of initial stress; 4. Thermal stresses in coated parts; 5. Some results of the experiments; Conclusions; Bibliography (Main publication on the subject of the thesis; Abstracts of main reports on the subject of the thesis; References); Appendix: Examples of application. | eng |
| dc.description.abstract | Väitekirjas käsitletakse eksperimentaalsete meetodite väljatöötamist ja täiustamist jääkpingete ja deformatsioonide määramiseks pinnetes ja pindega detailides. Esitatakse üldine algoritm, mis võimaldab määrata jääkpinged kas pinde kasvamisel (pindamisel) või kahanemisel (eemaldamisel) aluse vabal pinnal või pinde liikuval pinnal mõõdetud deformatsiooniparameetrite järgi. On koostatud algoritmid jääkpingete määramiseks paksu mitmekihilise pindega mitmekihilistes ristkülikvarrastes, plaatides, silindrites ja kerades. Täpsustatakse algpingete arvutust sirge ribaaluse, ümartraatalause, õhukeseseinalise torualuse ja lahtise rõnga kujulise aluse deformatsiooniparameetrite järgi. Esitatakse õhukeseseinalise torualuse ja lahtise rõnga kujulise aluse deformatsiooniparameetirte mõõtmise meetodid algpingete määramiseks vastavalt galvaanilistes ja tampoongalvaanilistes pinnetes. Fotoelastsumeetodiga on kontrollitud jääkpingete jaotust sirge varrasaluse ühepoolses pindes. Termobimetallanaloogiat kasutades on näidatud, et ühepoolse pinde kasvamisel või kahanemisel paindub riba- või plaatalus sfääriliselt. Eksperimentaalselt on kontrollitud ühepoolse pindega kruvijoonelise ribaaluse puhta painde teooriat. On uuritud jääkpingeid paksudes galvaanilistes teraspinnetes. | est |
| dc.identifier.isbn | 9789949483099 | |
| dc.identifier.issn | 1406-4758 | |
| dc.identifier.uri | http://hdl.handle.net/10492/3808 | |
| dc.publisher | Tallinn Technical University | eng |
| dc.relation.ispartofseries | Theses of Tallinn Technical University | |
| dc.rights | Creative Commons Attribution 4.0 International (CC BY 4.0) | eng |
| dc.rights | info:eu-repo/semantics/openAccess | eng |
| dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | eng |
| dc.subject | dissertatsioonid | est |
| dc.subject | pinged (füüs.) | est |
| dc.subject | deformatsioon | est |
| dc.subject | pindamine | est |
| dc.subject | dissertations | eng |
| dc.subject | stress (mechanics) | eng |
| dc.subject | deformation | eng |
| dc.subject | coating | eng |
| dc.title | Determination of Residual Stresses in Coatings and Coated Parts | eng |
| dc.title.alternative | Jääkpingete määramine pinnetes ja pindega detailides | est |
| dc.type | info:eu-repo/semantics/doctoralThesis | eng |
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