{"?xml":{"@version":"1.0"},"edm:RDF":{"@xmlns:dc":"http://purl.org/dc/elements/1.1/","@xmlns:edm":"http://www.europeana.eu/schemas/edm/","@xmlns:wgs84_pos":"http://www.w3.org/2003/01/geo/wgs84_pos","@xmlns:foaf":"http://xmlns.com/foaf/0.1/","@xmlns:rdaGr2":"http://rdvocab.info/ElementsGr2","@xmlns:oai":"http://www.openarchives.org/OAI/2.0/","@xmlns:owl":"http://www.w3.org/2002/07/owl#","@xmlns:rdf":"http://www.w3.org/1999/02/22-rdf-syntax-ns#","@xmlns:ore":"http://www.openarchives.org/ore/terms/","@xmlns:skos":"http://www.w3.org/2004/02/skos/core#","@xmlns:dcterms":"http://purl.org/dc/terms/","edm:WebResource":[{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:DOC-BVG6CDQA/185bcaa8-e682-41e1-972d-d0bb317a80d5/HTML","dcterms:extent":"37 KB"},{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:DOC-BVG6CDQA/2255058b-a462-4f18-85ab-91458da84db8/PDF","dcterms:extent":"231 KB"},{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:DOC-BVG6CDQA/8cdb4a82-2fcf-4f52-ab3c-ce2f18bfbce9/TEXT","dcterms:extent":"36 KB"}],"edm:TimeSpan":{"@rdf:about":"1999-2025","edm:begin":{"@xml:lang":"en","#text":"1999"},"edm:end":{"@xml:lang":"en","#text":"2025"}},"edm:ProvidedCHO":{"@rdf:about":"URN:NBN:SI:DOC-BVG6CDQA","dcterms:isPartOf":[{"@rdf:resource":"https://www.dlib.si/details/URN:NBN:SI:spr-6QOUKQ9A"},{"@xml:lang":"sl","#text":"Strojniški vestnik"}],"dcterms:issued":"2002","dc:creator":["Flašker, Jože","Glodež, Srečko","Jelaska, Damir","Kramberger, Janez"],"dc:format":[{"@xml:lang":"sl","#text":"10 strani"},{"@xml:lang":"sl","#text":"letnik:48"},{"@xml:lang":"sl","#text":"številka:5"},{"@xml:lang":"sl","#text":"str. 257-266"}],"dc:identifier":["ISSN:0039-2480","COBISSID:5447451","URN:URN:NBN:SI:doc-BVG6CDQA"],"dc:language":["en","sl"],"dc:publisher":[{"@xml:lang":"sl","#text":"Association of Mechanical Engineers and Technicians of Slovenia et al."},{"@xml:lang":"sl","#text":"Zveza strojnih inženirjev in tehnikov Slovenije et al."}],"dc:subject":[{"@xml:lang":"sl","#text":"doba življenjska"},{"@xml:lang":"sl","#text":"procesi utrujanja"},{"@xml:lang":"sl","#text":"širjenje razpok"},{"@xml:lang":"sl","#text":"širjenje razpoke"},{"@xml:lang":"sl","#text":"utrujanje materiala"},{"@xml:lang":"sl","#text":"zobniki"},{"@rdf:resource":"http://www.wikidata.org/entity/Q507234"}],"dcterms:temporal":{"@rdf:resource":"1999-2025"},"dc:title":{"@xml:lang":"sl","#text":"Računski model za preračun upogibne trdnosti zobnikov| A computational model for calculating the bending-load capacity of gears|"},"dc:description":[{"@xml:lang":"sl","#text":"A computational model for determining the service life of gears with regard to bending fatique in a gear-tooth root is presented. The fatique proces loading to tooth breakage is divided into the crack-initiation and crack- propagation periods. The Coffin-Manson relationship is used to determine the number of stress cycles, Np, required for the fatique crack initiation, where it is assumed that the initial crack is located at the point of the largest stresses in a gear-tooth root. The simple Paris equation is then used for the further simulation of the fatique crack growth, where the required material parameters have been determined previously with appropriate test specimen. The functional relationship between the stress-intensity factor and the crack length, K=f(a), which is needed for determining the required number of loading cycles, Np for a crack propagation from the initial to the critical length, is obtained numerically in the framework of the finite-element method.The total number of stress cycles, N, for the final failure to occur is then a sum N=Ni+Np. Altrough some influences (non-homogeneous material, travelling of dislocations, etc.) were not taken into account in the computational simulations, the presented model seems to be very suitable for determining the service life of gears because the numerical procedures used here are much faster and cheaper than experimantal testing"},{"@xml:lang":"sl","#text":"V prispevku je predstavljen računski model za določitev dobe trajanja zobnikov glede na trdnost v zobnem korenu. Potek utrujanja, ki vodi do zloma zoba v korenu, sestoji iz nastanka in širjenja utrujenostne razpoke. Za določitev potrebnega števila obremenitvenih ponovitev Ni za nastanek utrujenostne razpoke je uporabljen Coffin-Mansonov zakon, pri katerem je predpostavljeno, da je začetna razpoka locirana na mestu največjih napetosti v zobnem korenu. Za nadaljnje širjenje razpoke je uporabljen znani Parisov zakon, pri katerem so potrebne materialne veličine določene poprej na podlagi ustreznih testnih preskušancev. Funkcijska odvisnost med faktorjem intenzivnosti napetosti in dolžino razpoke K=f(a), ki je potrebna za določitev potrebnega števila obremenitvenih ciklov Np za razširitev razpoke od začetne do kritične dolžine, je izračunana numerično z metodo končnih elementov. Skupno število obremenitvenih ponovitev N za pojav končne poškodbe je vsota N=Ni+Np. Čeprav nekateri vplivi (nehomogeni material, gibanje dislokacij) pri preračunih niso upoštevani, je predstavljen računski model zelo primeren za določitev dobe trajanja zobnikov, saj so tukaj predstavljeni numerični postopki hitrjši in cenejši v primerjavi z eksperimentalnim delom"}],"edm:type":"TEXT","dc:type":[{"@xml:lang":"sl","#text":"znanstveno časopisje"},{"@xml:lang":"en","#text":"journals"},{"@rdf:resource":"http://www.wikidata.org/entity/Q361785"}]},"ore:Aggregation":{"@rdf:about":"http://www.dlib.si/?URN=URN:NBN:SI:DOC-BVG6CDQA","edm:aggregatedCHO":{"@rdf:resource":"URN:NBN:SI:DOC-BVG6CDQA"},"edm:isShownBy":{"@rdf:resource":"http://www.dlib.si/stream/URN:NBN:SI:DOC-BVG6CDQA/2255058b-a462-4f18-85ab-91458da84db8/PDF"},"edm:rights":{"@rdf:resource":"http://rightsstatements.org/vocab/InC/1.0/"},"edm:provider":"Slovenian National E-content Aggregator","edm:intermediateProvider":{"@xml:lang":"en","#text":"National and University Library of Slovenia"},"edm:dataProvider":{"@xml:lang":"sl","#text":"Univerza v Ljubljani, Fakulteta za strojništvo"},"edm:object":{"@rdf:resource":"http://www.dlib.si/streamdb/URN:NBN:SI:DOC-BVG6CDQA/maxi/edm"},"edm:isShownAt":{"@rdf:resource":"http://www.dlib.si/details/URN:NBN:SI:DOC-BVG6CDQA"}}}}