Bachelor's Thesis
Numerical modeling of crack propagation under conditions of LEFM
Final Thesis 3.17 MBAuthor of thesis: Ing. Jakub Mikula
Acad. year: 2011/2012
Supervisor: Ing. Martin Ševčík, Ph.D.
Reviewer: prof. Ing. Pavel Hutař, Ph.D.
Abstract:The presented bachelor’s thesis deals with numerical modeling of crack propagation in general planar body. A user macro was created in APDL programming language for estimation of crack propagation direction and collection of data. Macro allows selection one of the four criteria intended to estimate the direction of the crack and the subsequent listing of the data into a text document. The calculation is based on the finite element method (FEM) using a commercial system ANSYS. The conditions of linear elastic fracture mechanics (LEFM) are expected during the calculation. The first part of this thesis describes the basic concepts of LEFM, including a description of mentioned criteria. The second part is devoted to the created macro. It also describes the algorithm and the necessary conditions for correct processing of data. A comparison with available published data or with experimental data gives a summary of the accuracy and utilization of created macro. In conclusion, the example of estimation of the residual life by different criteria is shown, as its other application.
Fracture mechanics, crack, stress intensity factor, T – stress, residual life, finite element method (FEM)
Date of defence
19.06.2012
Result of the defence
Defended (thesis was successfully defended)
Grading
A
Process of defence
Posluchač představil komisi svou bakalářskou práci. Dále odpověděl výborně na všechny otázky oponenta a dalších členů komise.
Language of thesis
Slovak
Faculty
Department
Study programme
Engineering (B2341-3)
Field of study
Mechanical Engineering (B-STI)
Composition of Committee
Ing. Lubomír Junek, Ph.D. (předseda)
doc. Ing. Jana Horníková, Ph.D. (místopředseda)
Ing. Pavel Švancara, Ph.D. (člen)
Ing. Jaroslav Kovařík (člen)
prof. Ing. Luboš Náhlík, Ph.D. (člen)
doc. Ing. Tomáš Návrat, Ph.D. (člen)
doc. Ing. Vladimír Fuis, Ph.D. (člen)
doc. Ing. Zdeněk Florian, CSc. (člen)
Supervisor’s report
Ing. Martin Ševčík, Ph.D.
Grade proposed by supervisor: A
Reviewer’s report
prof. Ing. Pavel Hutař, Ph.D.
Grade proposed by reviewer: A