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2019, vol. 69, br. 3, str. 35-40
Uticaj geometrijskih nepravilnosti na brzinu rasta zamorne prsline u zoni otvora kod preklopnih spojeva hladno oblikovanih materijala sa čvrstim naleganjem
aKennesaw State University, Southern Polytechnic College of Engineering and Engineering Technology, Marietta, Georgia
bUniversity of California, Materials Science and Engineering Program, San Diego, California

e-adresaccoates4@kennesaw.edu
Projekat:
The authors would like to acknowledge the US Air Force Summer Faculty Fellowship program for funding this work.

Ključne reči: zamor materijala; prslina; mehanički spojevi; hladna obrada; čvrsto naleganje; metod konačnih elemenata
Sažetak
Ovaj rad istražuje uticaj nepravilnosti na brzinu rasta zamorne prsline u preklopnim spojevima (Hi-Lok veza). Metod konačnih elemenata korišćen je za modeliranje procesa hladne obrade i čvrstog naleganja. Dobijeni numerički rezultati su u saglasnosti sa eksperimentalnim ispitivanjima i rezultatima objavljenim u stručnoj literaturi. Proširena metoda konačnih elemenata (XFEM) je potom korišćena za simulaciju Moda I otvaranja prsline u hladno oblikovanoj pravougaonoj ploči na mestu otvora sa čvrstim naleganjem. Ispitana su četiri slučaja zamora sa konstantnim opterećenjem: (i) bez zaostalih napona, bez nepravilnosti, (ii) bez zaostalih napona, sa nepravilnosti, (iii) sa zaostalim naponima, bez nepravilnosti i (iv) sa zaostalim naponima, sa nepravilnosti. Rezultati dobijeni upotrebom XFEM analize i jednačine Walker-a pokazali su da postojanje nepravilnosti u vidu aksijalnog kanala duž otvora može značajno smanjiti (23%) zamorni vek komponente izložene cikličnom opterećenju konstantne amplitude. Postojanje zaostalih pritisnih napona u materijalu usled njegovog hladnog oblikovanja, odnosno usled čvrstog naleganja, dodatno smanjuje zamorni vek komponente.
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O članku

jezik rada: engleski
vrsta rada: neklasifikovan
DOI: 10.5937/str1903035C
objavljen u SCIndeksu: 13.05.2020.
Creative Commons License 4.0

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