Smernice pri izdelavi numeričnih modelov kolena

Šavorn, Gregor (author), Kunc, Robert (mentor), Trajkovski, Jovan (comentor)

Numerični modeli človeških teles se čedalje bolj razvijajo, saj se z razvojem računalniške zmogljivosti odpirajo vedno boljše možnosti računalniških analiz, ki temeljijo na metodi končnih elementov. Takšni modeli se uporabljajo za oceno tveganja nastanka različnih poškodb, ki so lahko posledica športnih ali prometnih nezgod. V okviru magistrske naloge predstavimo postopek izdelave numeričnih modelov kolenskih struktur, ki so najbolj obremenjene in so med seboj v drsnem stiku med gibanjem kolenskega sklepa. Na osnovi testnih simulacij se določita tip in optimalna velikost končnega elementa za model hrustanca ter meniskusa. Ugotovili smo, da se izmed nabora množice kontaktov v LS-Dyna kot najprimernejši tip kontakta med obema hrustancema ter hrustancem in meniskusom izkaže kontakt *CONTACT_SURFACE_TO_SURFACE. Poenostavljen numerični model kolenskega sklepa je sposoben izvesti pokrčenje kolena od 0 do 90° v času 25 ms, kar pomeni, da je uporaben za analize kratkotrajnih obremenitev.

• Language: Slovenian
• Keywords: numerični model kolena, kontakt, analiza napetosti, analiza deformacij, kinematika kolena
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [G. Šavorn]
• Year: 2020
• Number of pages: XXIV, 80 str.
• PID: 20.500.12556/RUL-119341
• UDC: 519.61:616.728.3:531.1(043.2)
• COBISS.SI-ID: 28708867
• Publication date in RUL: 08.09.2020

Secondary language

• Language: English
• Title: Guidelines for a numerical knee model development

Abstract

Numerical Human Body Models are constantly evolving, as the development of computing power opens up improved possibilities for computational analysis based on the finite element method. Such models are used to assess the risk of various injuries that may result from sports or traffic accidents. In the master's thesis, we present the process of creating numerical models of knee structures that are most stressed and are in sliding contact with each other during the movement of the knee joint. Based on test simulations, the type and optimal finite element size for the cartilage and meniscus model is determined. We found that from the set of contacts in LS-Dyna, the contact *CONTACT_SURFACE_TO_SURFACE turns out to be the most suitable type of contact between both cartilages and cartilage and meniscus. A simplified numerical model of the knee joint is capable of performing knee flexion from 0 to 90° over a time period of 25 ms, which means that it is useful for short-term load analyzes.

• Keywords: numerical knee model, contact, stress analysis, deformation analysis, knee kinematics