Analiza vpliva mikro napak na trdnost pri utrujanju grobozrnatega TVP na zvarih : doktorska disertacija

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Analiza vpliva mikro napak na trdnost pri utrujanju grobozrnatega TVP na zvarih : doktorska disertacija

Vuherer, Tomaž

Nosilnost ciklično obremenjenih zvarnih spojev je odvisna od trdnosti najšibkejših mest. V primeru soležnih zvarov je najproblematičnejša mikrostruktura grobozrnatega toplotno vplivanega področja ... (TVP) na vznožju vara. Tu se pojavijo varilne zaostale napetosti in koncentracija napetosti. Mikro napake imajo vpliv na odpornost zvarov proti utrujenosti. V tej raziskavi smo pripravili vzorce jekla, ki se lahko nahajajo na vznožju vara, z mikro napakami v različnih stanjih z uporabo simulacije temperaturnega cikla varjenja in s toplotno obdelavo v peči. Umetne mikro napake so bili odtisi Vickersove piramide in slepe izvrtine. Preizkušance smo rotacijsko upogibno obremenjevali z razmerjem napetosti R = -1. Primerjali smo trdnost pri utrujanju treh martenzitnih jekel z in brez mikro napak. Upoštevali smo lokalne in globalne zaostale napetosti. Eksperimentalno smo raziskovali hitrost širjenja majhnih in velikih razpok. Analizirali smo mehanizme nastanka in zgodnjega širjenja razpok na jeklih v različnih stanjih. Nastanek razpok iz umetnih mikro napak, katerih velikost je primerljiva z največjimi mikrostrukturnimi enotami jekla, je funkcija lokalnih zaostalih napetosti zaradi priprave napak.

Type of material - dissertation ; adult, serious

Publication and manufacture - Maribor : [T. Vuherer], 2008

Language - slovenian

COBISS.SI-ID - 240161536

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Author
Vuherer, Tomaž

Other authors
Gliha, Vladimir | Kosec, Ladislav

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Links to authors' personal bibliographies	Links to information on researchers in the SICRIS system
Vuherer, Tomaž	15682
Gliha, Vladimir	05168
Kosec, Ladislav	00050

Source: Personal bibliographies and: SICRIS

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