Numerički proračun kompozitne sportske zaštitne opreme

master's thesis

• Title (english): Numerical analysis of composite sports protective equipment
• Author: Marko Čeredar
• Mentor: Darko Ivančević (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2023-07-21, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; General Mechanical Engineering (Construction)

Abstract

Zaštitna oprema važan je dio svake sportske aktivnosti te se koristi u svrhu smanjenja mogućeg nastanka ozlijede na ljudskom organizmu. U ovom diplomskom radu dan je pregled zaštitne opreme, te je odabran štitnik potkoljenice kao vrsta zaštitne opreme na kojoj je provedena numerička analiza udarnog opterećenja u programskom paketu Abaqus/Explicit. Štitnik potkoljenice može se podijeliti u dva glavna dijela, vanjska čvrsta ljuska i unutarnji apsorpcijski sloj koji su u svrhu ovog rada bili modelirani u programskom paketu Solidworks. Rubni i početni uvjeti opterećenja za analizu definirani su prema podacima iz literaturi. Nadalje, osim odabira zaštitne opreme dan je pregled anatomije i najčešćih ozljeda potkoljenice i zgloba koljena, te je odabran standard koji definira vrstu eksperimenta i očekivane rezultate kako bi štitnik potkoljenice zadovoljio sve uvjete prema kojima je rađena simulacija. Kako je štitnik izrađen od kompozitnih materijala, napravljen je pregled mehaničkih svojstva kompozitnih materijala. Za validaciju numeričkog modela korištena je višeslojna kompozitna ploča modelirana prema literaturi i očekivani rezultati potvrdili su pouzdanost numeričkog modela za udarna oštećenja višeslojne kompozitne ploče. Kako bi se približio način rada programskog paketa Abaqus, dan je pregled izraza uz teorijsku pozadinu za kriterij popuštanja i plastične deformacije pjenastih materijala. Na kraju su prikazani rezultati numeričke analize za apsorpcijski sloj i vanjsku ljusku štitnika te su za cjelokupni štitnik prikazani rezultati kontaktne sile između štitnika i noge, a osim kontaktne sile prikazane su i energije koje se razvijaju prilikom pretvorbe kinetičke energije udarača prilikom udara o štitnik.

Abstract (english)

Protective gear is an important part of every sports activity and it is used for the reduction of the possibility that an injury on the human body can be created. In this Master’s thesis, the review of protective gear is given and a shin guard was chosen as the protective gear type on which the impact numerical analysis is conducted with the software Abaqus/Explicit. Shin guard can be divided into two major parts, an outer protective shell and an internal absorption layer which were modeled in the software Solidworks. Boundary, as well as initial conditions for numerical analysis were modeled according to the information found in literature. Furthermore, alongside choosing the protective gear, a review of the anatomy and the most frequent injury mechanisms for the shin and the knee joint is given, and a standard that defines the experiment type and the expected results for shin guards is selected for modeling the simulation accordingly. As the shin guard is made out of composite materials, the mechanical properties of composite materials is shown. To validate the numerical model, multiply composite plate has been modeled according to the literature and the results confirmed the reliability of the numerical model for impact damage of laminated composite plate. To elaborate the way the software Abaqus works, formulae as well as a theoretical basis for failure criterion and plastic deformation of foam materials is given. In the end, the results of the numerical analysis for the absorption layer and the outer shell are shown, as well as, for coomplete shin guard, the contact force between the shin guard and the leg, as well as energies which are developed during the conveyance of kinetic energy from the impactor to the guard.

• Keywords: Štitnik potkoljenice; numeričko modeliranje udarnog opterećenja; metoda konačnih elemenata; kriterij popuštanja.
• Keywords (english): Shin guard; numerical modeling of impact damage; finite element method; failure criterion
• Language: croatian
• URN:NBN: urn:nbn:hr:235:501790
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-07-07 09:02:02