A5102804369- Structural Load-Bearing Analysis
- Structural Behavior of Reinforced Concrete
- Textile materials and evaluations
- Mechanical Behavior of Composites
- Structural Analysis and Optimization
- Fire effects on concrete materials
- Composite Structure Analysis and Optimization
- Structural Engineering and Vibration Analysis
- Metal Forming Simulation Techniques
- Civil and Structural Engineering Research
- Structural Analysis of Composite Materials
- Structural Health Monitoring Techniques
- Laser and Thermal Forming Techniques
- Aerosol Filtration and Electrostatic Precipitation
- Probabilistic and Robust Engineering Design
- Cellular and Composite Structures
- Masonry and Concrete Structural Analysis
- Seismic Performance and Analysis
- Topology Optimization in Engineering
- Seismic and Structural Analysis of Tall Buildings
- Nanopore and Nanochannel Transport Studies
- Structural Integrity and Reliability Analysis
- Structural Engineering and Materials Analysis
- Engineering Structural Analysis Methods
- Wood Treatment and Properties
Karlsruhe Institute of Technology
2005-2024
Western University
2021
Bundesanstalt für Wasserbau
2021
Technische Universität Dresden
2021
Johns Hopkins University
2008-2019
Bayer (Germany)
2010
Karlsruhe University of Applied Sciences
2009
New Orleans Public Library
2000
Hollister (United States)
1999
Cornell University
1997-1999
The tip asymmetry of a bevel-tip needle results in the naturally bending when it is inserted into soft tissue. This enables robotic steering, which can be used medical procedures to reach subsurface targets inaccessible by straight-line trajectories. However, accurate path planning and control steering require models needle-tissue interaction. Previous kinematic required empirical observations each tissue combination order fit model parameters. study describes mechanics-based predict...
The moment capacity of a laterally braced cold-formed steel flexural member with edge stiffened flanges (e.g., channel or zee section) may be affected adversely by local distortional buckling. New procedures for hand prediction the buckling stress in and mode are presented verified. Numerical investigations employed to highlight postbuckling behavior unique mode. Compared mode, is shown have (1) heightened imperfection sensitivity, (2) lower capacity, (3) ability control failure mechanism...
The asymmetry of a bevel-tip needle results in the naturally bending when it is inserted into soft tissue. In this study we present mechanics-based model that calculates deflection embedded an elastic medium. Microscopic observations for several needle-gel interactions were used to characterize at bevel tip and along shaft. design was guided by microscopic interactions. energy-based formulation incorporates tissue-specific parameters such as rupture toughness, nonlinear material elasticity,...
Abstract. Macroscopic modeling of a non-crimp fabric’s (NCF’s) forming behavior is challenging as it strongly depends on the textile architecture, fiber type, and stitching type. While shear main deformation mode woven fabrics, membrane approaches for NCFs should also consider roving slippage. However, 0°/90° biaxial (Biax-NCF) with symmetrical pattern high stitch pretension, deviations from pure-shear assumption in coupon tests are only observed at higher angles due to limited In this work,...
For efficient large-series production and improved process design, a profound understanding of textile's forming behavior is crucial to ensure adequate drapability defect-free components. Woven fabrics have often been the focus research due their easier formability, while non-crimp (NCFs) investigated much less despite higher lightweight potential, resulting in limited experimental basis for validation numerical models. Therefore, experiments unidirectional bidirectional NCF are conducted...
The objective of this paper is to provide the theoretical background and illustrate capabilities constrained finite strip method (cFSM) for thin-walled members with general end boundary conditions. Based on conventional (FSM), cFSM provides a mechanical methodology separate deformations member into those consistent global, distortional, local, other (e.g., shear transverse extension) modes. For elastic buckling analysis, enables isolation any given mode (modal decomposition) or quantitative...
Abstract. The friction behavior of engineering textiles directly affects the forming quality during composite molding processes. In tests dry large relative slip between plies and tools is observed. resulting tangential contact stresses influence material’s membrane stresses, which in turn impact fabric’s deformation potentially lead to defects such as gapping or ruptures textile. characterization commonly conducted via motion a fabric ply either another (ply-ply) tool (tool-ply) under...
Unidirectional non-crimp fabrics (UD-NCFs) are highly suitable for high-performance components due to their excellent lightweight potential. However, during forming they prone wrinkling and gapping compared woven or biaxial textiles. Macroscopic simulation models can be used efficiently predict these effects as well the global behavior complex geometries. Therefore, a new hyperelastic membrane model is proposed describe typical deformation of UD-NCFs based on superimposed shear, transverse...
Abstract The production of high-performance composite parts with non-crimp fabrics (NCFs) requires a profound understanding the material’s behavior during draping to prevent forming defects such as wrinkling and gapping. Simulation methods can be used model complex material NCFs predict their deformation process. However, do not intrinsically deform under pure shear like most woven fabrics, but often superimposed shear, transverse tension in-plane roving compaction. Therefore, non-standard...