TY  - THES
A1  - Khademi Zahedi, Reza
T1  - Stress Distribution in Buried Defective PE Pipes and Crack Propagation in Nanosheets
N2  - Buried PE pipelines are the main choice for transporting hazardous hydrocarbon fluids and are used in urban gas distribution networks.
Molecular dynamics (MD) simulations used to investigate material behavior at nanoscale.
KW  - Gasleitung
KW  - gas pipes
KW  - Riss
KW  - Defekt
KW  - defects
KW  - nanosheets
KW  - crack
KW  - maximum stress
Y1  - 2021
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20210803-44814
ER  - 
TY  - THES
A1  - Schumann, Alexander
T1  - Untersuchung und Beurteilung des Rissverhaltens eines Betongelenkes anhand unterschiedlicher Methoden
N2  - Die Bruchmechanik hat einen wichtigen Platz im modernen Bauingenieurwesen, um die Ausbreitung von Rissen in Bauteilen und ihre Gefährlichkeit einzuschätzen. Dabei kommen verschiedenste Methoden zum Einsatz. In dieser Arbeit soll die Qualitätsbewertung für einige dieser Methoden untersucht werden. Zu vergleichen sind u. a. die Genauigkeit, die Schnelligkeit, die Komplexität und die Stabilität. In den Vergleich sind die Finite Elemente Methode, die Extended Finite Elemente Methode und eine Kopplungsmethode (analytische Lösung für die Rissspitze und Finite Elemente Lösung für den Rest des Gebietes) einzubeziehen. Als reales Beispiel aus dem Bauingenieurwesen wird ein Betongelenk mit einem vorhandenen Riss betrachtet.
KW  - Finite Elemente Methode
KW  - Extended Finite-Elemente-Methode
KW  - Analytische Lösung
KW  - Betongelenk
KW  - Riss
KW  - Kopplungsmethode
Y1  - 2013
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20130722-19829
ER  - 
TY  - JOUR
A1  - Vu-Bac, N.
A1  - Nguyen-Xuan, Hung
A1  - Chen, Lei
A1  - Lee, C.K.
A1  - Zi, Goangseup
A1  - Zhuang, Xiaoying
A1  - Liu, G.R.
A1  - Rabczuk, Timon
T1  - A phantom-node method with edge-based strain smoothing for linear elastic fracture mechanics
JF  - Journal of Applied Mathematics
N2  - This paper presents a novel numerical procedure based on the combination of an edge-based smoothed finite element (ES-FEM) with a phantom-node method for 2D linear elastic fracture mechanics. In the standard phantom-node method, the cracks are formulated by adding phantom nodes, and the cracked element is replaced by two new superimposed elements. This approach is quite simple to implement into existing explicit finite element programs. The shape functions associated with discontinuous elements are similar to those of the standard finite elements, which leads to certain simplification with implementing in the existing codes. The phantom-node method allows modeling discontinuities at an arbitrary location in the mesh. The ES-FEM model owns a close-to-exact stiffness that is much softer than lower-order finite element methods (FEM). Taking advantage of both the ES-FEM and the phantom-node method, we introduce an edge-based strain smoothing technique for the phantom-node method. Numerical results show that the proposed method achieves high accuracy compared with the extended finite element method (XFEM) and other reference solutions.
KW  - Finite-Elemente-Methode
KW  - Steifigkeit
KW  - Bruchmechanik
KW  - Riss
Y1  - 2013
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20170426-31676
ER  -