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A dynamic XFEM formulation for crack identification (2016)
Zhang, Chao ; Wang, Cuixia ; Lahmer, Tom ; He, Pengfei ; Rabczuk, Timon
A dynamic XFEM formulation for crack identification
A novel parameter identification approach for buffer elements involving complex coupled thermo-hydro-mechanical analyses (2016)
Nguyen-Tuan, Long ; Lahmer, Tom ; Datcheva, Maria ; Stoimenova, Eugenia ; Schanz, Tom
A novel parameter identification approach for buffer elements involving complex coupled thermo-hydro-mechanical analyses
A software framework for probabilistic sensitivity analysis for computationally expensive models (2016)
Vu-Bac, N. ; Lahmer, Tom ; Zhuang, Xiaoying ; Nguyen-Thoi, T. ; Rabczuk, Timon
A software framework for probabilistic sensitivity analysis for computationally expensive models
A stochastic computational method based on goal-oriented error estimation for heterogeneous geological materials (2016)
Ghorashi, Seyed Shahram ; Lahmer, Tom ; Bagherzadeh, Amir Saboor ; Zi, Goangseup ; Rabczuk, Timon
A stochastic computational method based on goal-oriented error estimation for heterogeneous geological materials
A unified framework for stochastic predictions of Young's modulus of clay/epoxy nanocomposites (PCNs) (2015)
Vu-Bac, N. ; Silani, Mohammad ; Lahmer, Tom ; Zhuang, Xiaoying ; Rabczuk, Timon
A unified framework for stochastic predictions of Young's modulus of clay/epoxy nanocomposites (PCNs)
Beitrag zur Stabilitätsuntersuchung von Strukturen mit räumlich korrelierten geometrischen Imperfektionen (1997)
Schorling, York
Für geometrisch imperfekte Strukturen wird die Versagenswahrscheinlichkeit bezüglich Stabilitätskriterien bestimmt. Eine probabilistische Beschreibung der geometrischen Imperfektionen erfolgt mit skalaren ortsdiskretisierten Zufallsfeldern. Die Stabilitätsberechnungen werden mit der Finite Elemente Methode durchgeführt. Ausgangspunkt der Berechnung ist eine systematische Formulierung probabilistisch gewichteter Imperfektionsformen durch eine Eigenwertzerlegung der Kovarianzmatrix. Wenn mit einer strukturmechanisch orientierten Sensitivitätsanalyse ein Unterraum zur näherungsweisen Beschreibung des probabilistischen Strukturverhaltens gefunden wird, kann die Versagenswahrscheinlichkeit numerisch sehr effizient durch ein Interaktionsmodell bestimmt werden. Es zeigte sich, daß dies genau dann möglich ist, wenn die Beulform merklich im Imperfektionsfeld enthalten ist. Die Imperfektionsform am Bemessungspunkt entspricht dann, unabhängig vom Lastniveau, gerade der Beulform. Wenn die Beulform im Imperfektionsfeld einen untergeordneten Beitrag liefert, erscheint eine Reduktion des stochastischen Problems auf wenige Zufallsvariablen dagegen nicht möglich.
Bewertungsmethoden für Modelle des konstruktiven Ingenieurbaus (2011)
Lahmer, Tom ; Knabe, Tina ; Nikulla, Susanne ; Reuter, Markus
Bewertungsmethoden für Modelle des konstruktiven Ingenieurbaus
Conceptual implementation of the variance-based sensitivity analysis for the calculation of the first-order effects (2016)
Marzban, Samira ; Lahmer, Tom
Conceptual implementation of the variance-based sensitivity analysis for the calculation of the first-order effects
Crack identification in hydro-mechanical systems with applications to gravity water dams (2010)
Lahmer, Tom
Crack identification in hydro-mechanical systems with applications to gravity water dams
Damage identification in gravity dams using dynamic coupled hydro-mechanical XFEM (2017)
Alalade, Muyiwa ; Nguyen-Tuan, Long ; Wuttke, Frank ; Lahmer, Tom
Damage identification in gravity dams using dynamic coupled hydro-mechanical XFEM.
Detection of flaws in piezoelectric structures using extended FEM (2013)
Nanthakumar, S.S. ; Lahmer, Tom ; Rabczuk, Timon
Detection of flaws in piezoelectric structures using extended FEM
Detection of material interfaces using a regularized level set method in piezoelectric structures (2015)
Nanthakumar, S.S. ; Lahmer, Tom ; Zhuang, Xiaoying ; Zi, Goangseup ; Rabczuk, Timon
Detection of material interfaces using a regularized level set method in piezoelectric structures
Detection of material interfaces using a regularized level set method in piezoelectric structures (2016)
Nanthakumar, S.S. ; Lahmer, Tom ; Zhuang, Xiaoying ; Zi, Goangseup ; Rabczuk, Timon
Detection of material interfaces using a regularized level set method in piezoelectric structures
Detection of multiple flaws in piezoelectric structures using XFEM and level sets (2014)
Nanthakumar, S.S. ; Lahmer, Tom ; Rabczuk, Timon
Detection of multiple flaws in piezoelectric structures using XFEM and level sets
Detection of multiple flaws in piezoelectric structures using XFEM and level sets (2016)
Nanthakumar, S.S. ; Lahmer, Tom ; Rabczuk, Timon
Detection of multiple flaws in piezoelectric structures using XFEM and level sets
Distributed computing of failure probabilities for structures in civil engineering (2004)
Wellmann Jelic, Andres ; Baitsch, Matthias ; Hartmann, Dietrich
In this contribution the software design and implementation of an analysis server for the computation of failure probabilities in structural engineering is presented. The structures considered are described in terms of an equivalent Finite Element model, the stochastic properties, like e.g. the scatter of the material behavior or the incoming load, are represented using suitable random variables. Within the software framework, a Client-Server-Architecture has been implemented, employing the middleware CORBA for the communication between the distributed modules. The analysis server offers the possibility to compute failure probabilities for stochastically defined structures. Therefore, several different approximation (FORM, SORM) and simulation methods (Monte Carlo Simulation and Importance Sampling) have been implemented. This paper closes in showing several examples computed on the analysis server.
Enhanced homogenization technique for magnetomechanical systems using the generalized finite element method (2009)
Hauck, A. ; Lahmer, Tom ; Kaltenbacher, Manfred
Enhanced homogenization technique for magnetomechanical systems using the generalized finite element method
Evaluation of coupled partial models in structural engineering using graph theory and sensitivity analysis (2011)
Keitel, Holger ; Karaki, Ghada ; Lahmer, Tom ; Nikulla, Susanne ; Zabel, Volkmar
Evaluation of coupled partial models in structural engineering using graph theory and sensitivity analysis
Extended Finite Element Method for Dynamic Fracture of Piezo-Electric Materials (2012)
Nguyen-Vinh, H. ; Bakar, I. ; Msekh, Mohammed Abdulrazzak ; Song, Jeong-Hoon ; Muthu, Jacob ; Zi, Goangseup ; Le, P. ; Bordas, Stéphane Pierre Alain ; Simpson, R. ; Natarajan, S. ; Lahmer, Tom ; Rabczuk, Timon
We present an extended finite element formulation for dynamic fracture of piezo-electric materials. The method is developed in the context of linear elastic fracture mechanics. It is applied to mode I and mixed mode-fracture for quasi-steady cracks. An implicit time integration scheme is exploited. The results are compared to results obtained with the boundary element method and show excellent agreement.
Fem-based determination of real and complex elastic, dielectric, and piezoelectric moduli in piezoceramic materials (2008)
Lahmer, Tom ; Kaltenbacher, Manfred ; Kaltenbacher, Barbara ; Lerch, Reinhard ; Leder, Erich
Fem-based determination of real and complex elastic, dielectric, and piezoelectric moduli in piezoceramic materials.
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