Calibration and validation of a damage model for 6005-T6 aluminium

master's thesis

• Title (croatian): Kalibracija i validacija modela oštećenja za 6005-T6 aluminij
• Author: Matej Stanić
• Mentor: Zdenko Tonković (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2021-01-22, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

The automotive industry is one of the world's largest industries. Also it is a leader in innovative engineering solutions. However, due to the need to reduce pollutant exhaust emissions, the classic automotive industry is undergoing a major transformation. The use of conventional internal combustion engines is increasingly being replaced by electric powertrain. Electric motors use power from energy stored in battery packs located in the chassis of the vehicle. Since the most batteries contain flammable chemicals, they pose a great danger to users in the event of a collision. Therefore, the battery packs are placed in housings made of aluminium alloys that protect them in the event of an impact. In addition to relatively low density, aluminium alloys have sufficient ductility to ensure energy absorption on impact. For optimal construction of the battery housing, it is necessary to know the exact properties of the alloy used and its behavior during the development of ductile damage due to loading. In this paper, a 6005-T6 aluminium alloy that is often used in the automotive industry is analyzed. At the beginning, the theoretical background of elastoplastic material behavior and material behavior due to the evolution of ductile damage is presented. In order to accurately implement the material into numerical simulations, experimental tests were performed on different specimen types to describe as many stress states as possible. To describe the elastoplastic behavior of the material, a combined Swift-Voce flow law was used, the parameters of which were determined by an inverse experimental-numerical procedure. An analysis of the initiation and evolution of ductile damage was performed using the Abaqus software package. Afterwards, the analysis results were validated with the results of experimental measurements. The parameters of damage initiation and propagation for different stress states are determined.

Abstract (croatian)

Automobilska industrija jedna je od najvećih svjetskih industrija te je predvodnik u inovativnim inženjerskim rješenjima. Ipak, uslijed potrebe za smanjenjem emisije štetnih ispušnih plinova, klasična automobilska industrija doživljava veliku transformaciju. Upotreba konvencionalnih motora s unutarnjim izgaranjem sve se više zamjenjuje električnim pogonom. Elektromotori dobivaju električnu energiju iz baterijskih blokova koji su smješteni u podvozju vozila. Budući da većina baterija sadrži zapaljive kemikalije, u slučaju sudara one predstavljaju veliku opasnost za korisnike. Stoga, baterijski se blokovi postavljaju u kučišta izrađena od aluminijskih legura koje ih štite u slučaju udara. Osim relativno niske gustoće, aluminijske legure imaju dovoljnu duktilnost koja osigurava apsorpciju energije prilikom udara. Za optimalno konstruiranje kučišta baterija, potrebno je poznavati točna svojstva korištene legure te njezino ponašanje prilikom razvoja duktilnog oštećenja uslijed opterećivanja. U ovome radu analizirana je 6005-T6 aluminijska legura koja se često koristi u automobilskoj industriji. Na početku je prikazana teorijska pozadina elastoplastičnog ponašanja materijala i ponašanja materijala uslijed rasta duktilnog oštećenja. Kako bi se materijal točno implementirao u numeričke simulacije, provedena su eksperimentalna ispitivanja na različitim vrstama uzoraka kako bi se opisalo što više stanja naprezanja. Za opis elastoplastičnog ponašanja materijala korišten je kombinirani Swift-Voce zakon tečenja, čiji su parametri određeni inverznom eksperimentalno-numeričkom procedurom. Provedena je analiza iniciranja i razvoja duktilnog oštećenja primjenom programskog paketa Abaqus, koja je validirana s rezultatima eksperimentalnih mjerenja. Određeni su parametri nastanka i propagacije oštećenja za različita stanja naprezanja.

• Keywords: elastoplastic behavior; combined Swift-Voce flow law; ductile damage; triaxiality; finite element method
• Keywords (croatian): elastoplastično ponašanje; kombinirani Swift-Voce zakon tečenja; triaksijalnost; duktilno oštećenje; metoda konačnih elemenata
• Language: english
• URN:NBN: urn:nbn:hr:235:861951
• 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; Embargo expiration date: 2023-01-14
• Created on: 2021-01-14 12:12:12