Refine
Year of publication
Document Type
- Article (112)
- Conference Proceeding (54)
- Part of a Book (12)
- Book (4)
- Other (3)
- Lecture (2)
Language
- English (187) (remove)
Keywords
- Finite-Elemente-Methode (12)
- Einspielen <Werkstoff> (10)
- FEM (6)
- Limit analysis (6)
- Shakedown analysis (6)
- shakedown analysis (6)
- limit analysis (4)
- Einspielanalyse (3)
- Shakedown (3)
- Technische Mechanik (3)
- Traglastanalyse (3)
- shakedown (3)
- Analytischer Zulaessigkeitsnachweis (2)
- Biocomposites (2)
- Bruchmechanik (2)
- Einspiel-Analyse (2)
- Natural fibres (2)
- Polymer-matrix composites (2)
- Stress concentrations (2)
- Traglast (2)
- damage (2)
- limit load (2)
- ratchetting (2)
- Alternating plasticity (1)
- Anastomose (1)
- Anastomosis (1)
- Anastomotic leakage (1)
- Autolysis (1)
- Axialbelastung (1)
- Axially cracked pipe (1)
- Basis Reduktion (1)
- Basis reduction (1)
- Bicharakteristikenverfahren (1)
- Biomechanics (1)
- Biomechanik (1)
- Biomedizinische Technik (1)
- Bladder (1)
- Bone sawing (1)
- Cardiac myocytes (1)
- Cardiac tissue (1)
- CellDrum (1)
- Chance constrained programming (1)
- Computational biomechanics (1)
- Constitutive model (1)
- Convex optimization (1)
- Damage mechanics theory (1)
- Decomposition (1)
- Deformation (1)
- Design-by-analysis (1)
- Discontinuous fractures (1)
- Druckbeanspruchung (1)
- Druckbehälter (1)
- Druckbelastung (1)
- Druckgeräte (1)
- Drug simulation (1)
- ES-FEM (1)
- Einspiel-Kriterium (1)
- Einspielen (1)
- Elastizität (1)
- Elastodynamik (1)
- Elastostatics (1)
- Electromechanical modeling (1)
- End-to-end colorectal anastomosis (1)
- Evolution of damage (1)
- Exact Ilyushin yield surface (1)
- Extension fracture (1)
- Extension strain criterion (1)
- FS-FEM (1)
- Fehlerstellen (1)
- Festkörper (1)
- Finite element analysis (1)
- Finite element analysis (FEA) (1)
- Finite element method (1)
- Finite element modelling (1)
- First Order Reliabiblity Method (1)
- First-order reliability method (1)
- Fließgrenze (1)
- Freeze–thaw process (1)
- Frequency adaption (1)
- Global and local collapse (1)
- Grenzwertberechnung (1)
- Growth modelling (1)
- Heart tissue culture (1)
- Hodgkin–Huxley models (1)
- Homogenization (1)
- Induced pluripotent stem cells (1)
- Inotropic compounds (1)
- Ion channels (1)
- Kinematics (1)
- Kinetics (1)
- Knochen (1)
- Knochenbildung (1)
- Knochenchirugie (1)
- Knochendichte (1)
- Liver (1)
- Materialermüdung (1)
- Mechanical simulation (1)
- Mechanics (1)
- Mohr–Coulomb criterion (1)
- Multi-dimensional wave propagation (1)
- Multimode failure (1)
- Muscle fibers (1)
- Nichtlineare Gleichung (1)
- Nichtlineare Optimierung (1)
- Nichtlineare Welle (1)
- Non-linear optimization (1)
- Non-parallel fissures (1)
- PFM (1)
- Passive stretching (1)
- Pelvic floor dysfunction (1)
- Pelvic muscle (1)
- Pharmacology (1)
- Plastizität (1)
- Pressure loaded crack-face (1)
- Progressive plastic deformation (1)
- Random variable (1)
- Ratcheting (1)
- Ratchetting (1)
- Reconstruction (1)
- Reliability analysis (1)
- Reliability of structures (1)
- Rohr (1)
- Rohrbruch (1)
- S-FEM (1)
- Schwammknochen (1)
- Sensitivity (1)
- Shakedown criterion (1)
- Spleen (1)
- Stahl (1)
- Statics (1)
- Stochastic programming (1)
- Strukturanalyse (1)
- Surgical staplers (1)
- Temperaturabhängigkeit (1)
- Uniaxial compression test (1)
- Ureter (1)
- Variable height stapler design (1)
- Wellen (1)
- Wolff's Law (1)
- Wolffsches Gesetz (1)
- Zug-Druck Belastung (1)
- alternierend Verformbarkeit (1)
- anaesthetic complications (1)
- anisotropy (1)
- biaxial tensile experiment (1)
- bicharacteristics (1)
- bone density (1)
- bone structure (1)
- burst pressure (1)
- burst tests (1)
- cancellous bone (1)
- chance constrained programming (1)
- constitutive modeling (1)
- dental trauma (1)
- design-by-analysis (1)
- difficult airway (1)
- direct method (1)
- distorted element (1)
- double-lumen tube intubation (1)
- elastic solids (1)
- fatigue analyses (1)
- finite element analysis (1)
- flaw (1)
- fortschreitende plastische Deformation (1)
- hiPS cardiomyocytes (1)
- hyperelastic (1)
- konvexe Optimierung (1)
- limit and shakedown analysis (1)
- linear kinematic hardening (1)
- load limit (1)
- lower bound theorem (1)
- material shakedown (1)
- mechanical waves (1)
- non-simplex S-FEM elements (1)
- nonlinear kinematic hardening (1)
- nonlinear optimization (1)
- nonlinear solids (1)
- nonlinear tensor constitutive equation (1)
- pipes (1)
- probabilistic fracture mechanics (1)
- reliability (1)
- reliability analysis (1)
- reliability of structures (1)
- second-order reliability method (1)
- shakedown analyses (1)
- smooth muscle contraction (1)
- stochastic programming (1)
- strain energy function (1)
- tension–torsion loading (1)
- thermal ratcheting (1)
- training simulator (1)
- vessels (1)
- videolaryngoscopy (1)
- virgin passive (1)
- virtual reality (1)
- viscoelasticity (1)
- yield stress (1)
Institute
- Fachbereich Medizintechnik und Technomathematik (187) (remove)
Pelvic floor dysfunction (PFD) is characterized by the failure of the levator ani (LA) muscle to maintain the pelvic hiatus, resulting in the descent of the pelvic organs below the pubococcygeal line. This chapter adopts the modified Humphrey material model to consider the effect of the muscle fiber on passive stretching of the LA muscle. The deformation of the LA muscle subjected to intra-abdominal pressure during Valsalva maneuver is compared with the magnetic resonance imaging (MRI) examination of a nulliparous female. Numerical result shows that the fiber-based Humphrey model simulates the muscle behavior better than isotropic constitutive models. Greater posterior movement of the LA muscle widens the levator hiatus due to lack of support from the anococcygeal ligament and the perineal structure as a consequence of birth-related injury and aging. Old and multiparous females with uncontrolled urogenital and rectal hiatus tend to develop PFDs such as prolapse and incontinence.
A 3D finite element model of the female pelvic floor for the reconstruction of urinary incontinence
(2014)
The propagation of mechanical waves in plates of isotropic elastic material is investigated. After a short introduction to the understanding of focussing of stress waves in a plate with a curved boundary the method of characteristics is applied to a plate of hyperelastic material. Using this method the propagation of acceleration waves is discussed. Based on this a numerical difference scheme is developed for solving initial-boundary-value problems and applied to two examples: propagation of a point disturbance in a homogeneously finitely strained non-linear elastic plate and geometrical focussing in al linear elastic plate.
Three-dimensional (3D) full-field measurements provide a comprehensive and accurate validation of finite element (FE) models. For the validation, the result of the model and measurements are compared based on two respective point-sets and this requires the point-sets to be registered in one coordinate system. Point-set registration is a non-convex optimization problem that has widely been solved by the ordinary iterative closest point algorithm. However, this approach necessitates a good initialization without which it easily returns a local optimum, i.e. an erroneous registration. The globally optimal iterative closest point (Go-ICP) algorithm has overcome this drawback and forms the basis for the presented open-source tool that can be used for the validation of FE models using 3D full-field measurements. The capability of the tool is demonstrated using an application example from the field of biomechanics. Methodological problems that arise in real-world data and the respective implemented solution approaches are discussed.