A5077473445- Cellular and Composite Structures
- Advanced Materials and Mechanics
- Structural Analysis and Optimization
- Polymer composites and self-healing
- Mechanical Behavior of Composites
- Composite Structure Analysis and Optimization
- Structural Response to Dynamic Loads
- Composite Material Mechanics
- Marine and environmental studies
- Textile materials and evaluations
- Protein Structure and Dynamics
- Chemical Thermodynamics and Molecular Structure
- Wind Energy Research and Development
- Acoustic Wave Phenomena Research
- Automotive and Human Injury Biomechanics
- Metal Forming Simulation Techniques
- Pickering emulsions and particle stabilization
- EEG and Brain-Computer Interfaces
- Modular Robots and Swarm Intelligence
- Statistical Mechanics and Entropy
- Advanced Chemical Physics Studies
- Spectroscopy and Quantum Chemical Studies
- Polymer Nanocomposites and Properties
- Origins and Evolution of Life
- Elasticity and Material Modeling
Singapore University of Social Sciences
2016-2025
Bharathiar University
2020
SRM Institute of Science and Technology
2020
National University of Singapore
1999-2007
Gleneagles Hospital
2005
Singapore Science Park
2001
National University
2001
This paper reviews 2D auxetic models, including 3D deformation models with behavior, from mechanism perspective instead of geometrical perspective. On this basis, across different groups can be regrouped into clusters that exhibit analogy in mechanism. Factors are taken consideration include the identification corresponding (i) rotation and non‐rotation units, as well (ii) linkages/joints between units non‐linkages/non‐joints various models. As a result, five have been identified, which...
Epilepsy is a brain disorder causing people to have recurring seizures. Electroencephalogram (EEG) the electrical activity of signals that can be used diagnose epilepsy. The EEG signal highly nonlinear and nonstationary in nature may contain indicators current disease, or warnings about impending diseases. chaotic measures like correlation dimension (CD), Hurst exponent (H), approximate entropy (ApEn) characterize signal. These features extracted for automatic diagnosis seizure onsets which...
Sleep apnoea is a very common sleep disorder which can cause symptoms such as daytime sleepiness, irritability and poor concentration. To monitor patients with this sleeping we measured the electrical activity of heart. The resulting electrocardiography (ECG) signals are both non-stationary nonlinear. Therefore, used nonlinear parameters approximate entropy, fractal dimension, correlation largest Lyapunov exponent Hurst to extract physiological information. This information was train an...
Recent years have seen a consistent trend in the extension of 2D auxetic models towards 3D ones. This article introduces linkage structure by extending double arrowhead honeycomb to an intersecting structure. A geometrical analysis on basis rigid linkages with rotational joints shows that auxeticity is manifested all three orthogonal planes. Results reveal geometry, terms either relative lengths or half angles, can be changed substantially control Poisson's ratio. It herein suggested...
This paper reports an experimental investigation on the effect of auxeticity towards impact loads. Both conventional and auxetic polyurethane (PU) foams were subjected to drop tests, damaged surfaces visually inspected. Although it is known that materials resist indentation due densification along load line, tests PU reveal are not necessarily advantageous over ones for very high impact. proposes a geometrical model resembles microstructure foams, as well elucidates both behavior limiting strength at
An auxetic metamaterial that exhibits isotropic in‐plane deformation is introduced herein in the form of rotating rigid units, consisting regular hexagons and equilateral triangles, are connected at their vertices. By inspection, Poisson's ratio a constant value ν = −1. The size descriptor this can be expressed as function unit sizes internal angle by means geometrical construction. energy method, effective Young's modulus has been established shown to governed rotational stiffness...
A class of 2D metamaterials, in the form cell walls made from bimaterial strips alternating orientation and interconnected by rigid rods, is introduced herein to exhibit effective biaxial positive negative thermal expansions. The magnitudes overall coefficients expansion (CTE) can be increased increasing slenderness strip CTE difference bimaterial. Results also indicate that any particular axis adjusted altering aspect ratios cells their arrangement. In addition or expansion, metamaterial...
Abstract This paper explores a new anisotropic auxetic system that consists of rotating rhombi and right triangles by inspiration from tangram pieces. The Poisson’s ratio was developed geometrical analysis on the representative unit with prescribed boundary requirements. Upon assigning rotational stiffness to hinges, Young’s modulus established matching potential energy stored in spiral springs strain deformation for homogenized continuum. Results indicate on-axes dimensionless moduli are...
This paper presents for the first time two types of metamaterials based on fragmentation–reconstitution rotating units in order to produce Poisson's ratio discontinuity at original state. For both metamaterials, each unit takes form a rhombus that comprises eight sub-units. During on-axis stretching, fragments into When prescribed strain is reversed, these sub-units reconstitute back single such they rotate as rigid body. Using geometrical construction, incremental was established In case...