SSM Engineering, Stenungsund, Sweden
An eigenvalue as well as a harmonic response analysis is performed on the Gullfaks C, Knock Out Drum (KOD) including some of the connecting pipe systems. The vibration behavior of two new choke valves and their specific connection to the KOD are of special interest. The main concern is the low frequency induced vibration as a consequence of the platform movements. A frequency band between 0-20 Hz ...
Kurt Lund Consulting, Del Mar, CA , USA
The present work formulates the dynamics of a slender structure as a long beam. This results in a PDE that is fourth-order in space, and second order in time. In COMSOL the coupling method is used to decompose this problem into two second-order equations, one for displacements, and one for bending moments, which are then solved to obtain frequencies and mode shapes. For verification of ...
C. Romao, and M. White
Dept. of Chemistry and Institute for Research in Materials
A series of 2-D finite element models of a ZrO2-ZrW2O8 composite system were created in COMSOL Multiphysics to study the effect of pores between the matrix (ZrO2) and filler (ZrW2O8) materials. Pores were modeled as ellipses concentric with the filler particles. Seventeen model geometries of varying microstructure were studied in order to determine correlations between microstructural factors ...
Investigation of the Effect of Spinal Defects on Spondylolysis and Stress Fracture of Vertebral Bodies
M.S. Yeoman, C. Quah, A. Cizinauskas, K. Cooper, D. McNally, B. Boszczyk
Continuum Blue, Tredomen, Ystrad Mynach, United Kingdom
The Centre for Spinal Studies and Surgery, Queen’s Medical Centre, Nottingham, United Kingdom
Bioengineering Research Group, Faculty of Engineering, The University of Nottingham, Nottingham, United Kingdom
Spondylolysis (SL) is a defect of the spinal vertebra, and is typically caused by stress fracture of the pars interarticularis bone of the vertebral arch. It is especially common in adolescents who over train in sporting activities. Spina bifida occulta (SBO) is a malformation of the spine where the protruding vertebral bodies are not fully formed. In this study we demonstrate the predisposition ...
Optimized Cantilever-to-Anchor Configurations of Buckled Cantilever Plate Structures for Transducer Applications
A. Arpys Arevalo Carreno, D. Conchouso Gonzalez, I.G. Foulds
King Abdullah University of Science and Technology, Thuwal, Mecca, Kingdom of Saudi Arabia
The mechanical simulation and analysis of the cantilever-to-anchor configuration for an out-of-plane structure used in transducer applications is reported. The polymer-based Buckled Cantilever Plate “BCP” structure, gives the ability to orient an active device from a horizontal to a vertical position, once assembled. In this paper we compare four different cantilever-to-anchor ...
J. Podichetty Thribhuvan, S.V. Madihally
Oklahoma State University, Stillwater, OK, USA
Utilization of bioreactors to regenerate tissues outside the body has been intensely investigated in functional tissue engineering. Various studies have been performed using computational fluid dynamics (CFD) to understand fluid flow within bioreactors while assuming porous scaffold as a rigid structure. However, the physical and mechanical properties of most tissue engineering scaffolds suggest ...
Interdisciplinary Nanoscience Center (iNANO) Aarhus University, The Faculty of Science, Ny Munkegade, Aarhus C, Denmark.
The analysis of the mechanical properties of bi-continuous structures has been problematic due to the complex geometry that describes these materials. In this study a method which identifies and quantifies the geometrical elements within the structure will be presented. A sample is in-situ compressed and its deformation is compared with the results of a FEMLAB finite element model. Initially, ...
A.T. Vermeltfoort, and J. van Schijndel
Eindhoven University of Technology, the Netherlands
The tensile strength of masonry is relatively low compared to its compressive strength and is affected by the direction of the joints and their filling. In masonry with modern thin layer mortar (joint thickness 3 to 5 mm) sometimes the head joints are left open. A total of 13 model-walls was built and for each model four general purpose mortar combinations and three thin layer mortar combinations ...
Jin, L.Z.1, Ssemakula, H.2, Sandström, R.1
1 Department of Materials Science and Engineering, Royal Institute of Technology, Sweden
2 Department of Production Engineering, Royal Institute of Technology, Sweden
Flow behaviour of phosphorus-deoxidised copper in plane-strain hot extrusion with an insertion in the die has been studied through a finite-element model consisting of fluid dynamics and heat transfer approaches. The billet material is considered as rigid-visco-plastic and rate-sensitive. A dynamic viscosity, which is strain-rate and temperature dependent, has been integrated into the model. ...
C. Del Vecchio
INAF-OAA, Firenze, Italy
The thin shell of the LBT Adaptive Secondary Mirror has been manufactured, optically polished, and delivered. The operations and tests required before finally mounting it on the telescope have to be run very carefully, as they imply loads completely different from the ones of the adaptive operational modes - studied in the past with very encouraging results. Deformations and stresses that occur ...