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Showing 1 to 20 of 46 for “"Poisson’s ratio"”.
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Effect of Poisson’s Ratio on Material Properties Characterization by Nanoindentation with a Cylindrical Flat Tip Indenter
… obtained from an indentation test with a known Poisson’s ratio. In this investigation the NANOVEA micro/nanoindentation tester with a cylindrical flat-tip indenter will be used to find the elastic modulus, hardness and Pile up. Low carbon steel AISI1018, alloy steel AISI 4340 and aluminum alloy …
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CHARACTERIZATION AND MODELLING OF MAGNETO-AUXETICITY, THE MAGNETICALLY INDUCED AUXETIC BEHAVIOR, IN GALFENOL
… In addition, Galfenol exhibits a highly negative Poisson’s ratio (denoted by ν) along the <110> crystallographic directions on {100} planes with ν values of as low as -0.7 under tensile loads. Consequently, their samples become wider when elongated and narrower when compressed (aka auxeticity). …
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Cement Stabilized Crushed Stone Base Course Strength and Stiffness Analysis
… includes material properties such as MOE and Poisson’s ratio, in addition to a large list of other inputs toprovide a pavement design that can resist required traffic loadings and other impacts. </p> <p>Cement Stabilized Crushed Stone Base Course (CSCSBC) is a subbase alternative that is …
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Additive manufacturing of stiffness optimised auxetic bone scaffold using cobalt-chromium-molybdenum superalloy
… strain behaviour owing to their negative Poisson’s ratio (−𝜐) leading to deformation modes and mechanical characteristics different to traditional porous architecture. This can lead to favourable outcomes for load-bearing tissue engineering constructs, such as bone scaffolds for …
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Inverse Modelling of Material Parameters for Rubber-like material: Create a New Methodology of Predicting the Material Parameters using Indentation Bending Test
… of new material properties (e.g. negative Poisson’s ratio) are also studied. In this work, the use of inverse FE modelling and indentation bending test for material property identification has been systematically studied. A parametric FE model has been developed and validated simulating the …
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Pore fluid pressure detection within the plate boundary fault interface of the Costa Rica convergent margin using AVO attributes
… plates. We applied pre-stack Kirchhoff time migration to a subset of these data across the frontal prism where amplitude versus offset (AVO) attributes were extracted along the decollement. When pore fluid pressure, l , exceeds 0.7, the pressure at which Poisson’s ratio begins to approach that …
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DESCRIPTION OF POLARONS IN LAYERED TRANSITION METAL OXIDES USING THE r2SCAN DENSITY FUNCTIONAL WITH FULLY NONLOCAL CORRECTIONS AND EFFECT OF STRAIN ON THE BAND GAP OF MONOLAYER MOLYBDENUM DISULFIDE
… by 400 meV/% strain under biaxial strain with a Poisson’s ratio of 0.44. We conducted density functional theory (DFT) calculations on a free-standing MoS2 monolayer using the generalized gradient approximation (GGA) PBE, the hybrid functional HSE06, and many-body perturbation theory with the GW …
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Experimental Testing and Numerical Investigation of Materials with Embedded Systems during Indentation and Complex Loading Conditions
… of auxeticity on the indentation stiffness ratio and the de-formation of the embedded system under different conditions (indenter size, thickness and embedment depth of the embedded layer) was established and key mechanisms of the Poisson’s ratio effect are highlighted. The results show that …
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Application of image analysis techniques to determine strain distribution in leather
… “lines of tightness”. Currently the cutting operation for shoe parts is guided by a general assumption about the pattern of the lines of tightness. There is a need to have available a system which can determine, in a non-destructive way, the lines of tightness in an indvidual piece of leather. …
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Mechanical Stiffness and Dissipation in Ultrananocrystalline Diamond Films
… We have measured the Young’s modulus (E), Poisson’s ratio and the quality factors (Q) for microfabricated overhanging ledges and fixed-free beams composed of UNCD films grown at lower temperatures. The overhanging ledges exhibited periodic undulations due to residual stress. This was used …
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TRANSVERSE RESONANCE ORTHOGONAL BEAM (TROB) SINGLE CRYSTAL UNDERWATER TRANSDUCERS
… piezoelectric properties and extremely high Poisson’s ratio of PZN-PT single crystals, a new drive mode for underwater projector, called the Transverse Resonance Orthogonal Beam (TROB) mode, has been devised. Unlike the conventional transverse width (CTW) mode or longitudinal (LG) mode in …
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Experimental and Numerical Investigation of Droplet Formation and Material Interactions Under Different Conditions
… (e.g. droplet shape, length, volume, separation time). The numerical data was correlated with an analytical solution based on pressure and velocity data from a mathematical approach and experimental; works on model materials with different properties. The program has been used to establish …
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Comparison and Correction of Multistage Triaxial Tests to Single Stage Triaxial Test for the Rock Mechanical Testing
… the results in terms of Young’s modulus, Poisson’s ratio, stiffness, friction angle, and cohesion. We provide a detailed discussion of the techniques and measurements required to correct the MST results to those obtained from SST protocol. A single correction factor is found to relate the …
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Prostate Tissue Motion Tracking and Ultrasound Elastography Using Tissue Mechanics Derived Constraints
… Material properties such as Young’s modulus, Poisson’s ratio, and shear modulus can be iteratively reconstructed using finite element analysis to enhance the output images further. The material property calculation process, known for its accuracy, yields informative results to clinicians when …
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Poroelastic Center of Dilation Revisited
… of the center of dilation solution on the Poisson’s ratio. This inconsistency is investigated by means of two alternative representations of the singularity and leads to the identification of a compressed zone inside the singularity. The poroelastic equivalent to this nucleus of strain is …
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Some dynamic mechanical properties of apple fruits and their use in the solution of an impacting contact problem of spherical fruit
… moduli and the imperfect shear state. Poisson’s ratio values for the three groups of apples tested at harvest condition were determined by Chappel* and used in the contact problem portion of this thesis. Contact problems involving one apple falling onto another supported underneath and …
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Finite-element analysis of inner ear hair bundles: a parameter study of bundle mechanics
… a Young’s modulus of 3 GPa (F-actin protein) and Poisson’s ratio of 0.4 (nearly incompressible) resulted in a stiffness of K = 2.1 x 10⁻³ N/m. This value is within the range of experimentally determined stiffmesses. Tip-link and subapical band interconnecting structures each contribute …
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COMPUTATIONS ON STATIC AND DYNAMIC MODELS OF SOLID SURFACES
… directions calculated, to give values of Poisson’s ratios. The surface Poisson’s ratio was defined, and values obtained for layer and cumulative surface Poisson’s ratios. A relationship between surface stress and superficial work was extended to incorporate surface Poisson’s ratios, and …
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Acoustic Metamaterials at the Microscale
… static mechanical properties such as stiffness, Poisson’s ratio, or strength. However, dynamic and acoustic properties of micro-architected materials remain largely unexplored, partially because it is challenging to measure their response at these scales. Dispersion resulting from Bragg …
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