Določanje materialnih parametrov utrujanja 3D natisnjenih vzorcev pri vibracijskem vzbujanju

Škrinjar, Štefan (author), Česnik, Martin (mentor), Boltežar, Miha (comentor)

Eden od izzivov, povezanih z uporabo 3D natisnjenih izdelkov, je določanje njihove dobe trajanja. V magistrski nalogi je predstavljen način, kako pridobiti materialne lastnosti utrujanja (Wohlerjevo krivuljo) iz preprostega in hitrega vibracijskega testa vzbujanja z naključnim signalom. Postopek temelji na primerjavi eksperimentalnih in teoretičnih dob trajanja, določenih iz numeričnega modela s frekvenčnimi števnimi metodami. Analizirani vzorci so se razlikovali po barvi, smeri tiska in dimenziji. Iz rezultatov je bil prepoznan vpliv različnih lastnosti vzorcev in uspešno potrjen postopek za določanja materialnih lastnosti.

• Language: Slovenian
• Keywords: Procesni parametri 3D tiskanja, Dinamski odziv strukture, Gostota močnostnega spektra napetosti, Doba trajanja, Wohlerjeva krivulja
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [Š. Škrinjar]
• Year: 2022
• Number of pages: XXII, 61 str.
• PID: 20.500.12556/RUL-139413
• UDC: 004.925.84:621.79(043.2)
• COBISS.SI-ID: 120223747
• Publication date in RUL: 02.09.2022

Secondary language

• Language: English
• Title: Assesment of material fatigue parameters for 3D printed samples during vibration excitation

Abstract

One of the challenges, associated with using 3D printed products, is determining their fatigue life. The master’s thesis presents a way to obtain material fatigue parameters (Wohler curve) using a simple and fast vibration excitation test with a random signal. The procedure is based on a comparison of experimental and theoretical fatigue lives, determined from a numerical model with frequency counting methods. The analyzed samples differed in color, print direction and dimension. From the results, the influence of different properties of the samples was identified and the procedure for determining the material properties was successfully confirmed.

• Keywords: 3D printing process parameters, Structure’s dynamic response, Stress power spectral density, Fatigue life, Wohler curve