Effective Poisson’s ratio from combined normal and lateral contacts of single crystals

2011 ◽  
Vol 27 (1) ◽  
pp. 182-191 ◽  
Author(s):  
J.H. Lee ◽  
Y.F. Gao ◽  
G.M. Pharr
Keyword(s):  
Single Crystals ◽  
Poisson’S Ratio ◽  
Poisson's Ratio ◽  
Image Position

Abstract

High-performance composite with negative Poisson’s ratio

2017 ◽  
Vol 32 (18) ◽  
pp. 3477-3484 ◽  
Author(s):  
Fernanda Steffens ◽  
Fernando Ribeiro Oliveira ◽  
Carlos Mota ◽  
Raul Fangueiro
Keyword(s):  
Poisson’S Ratio ◽  
High Performance ◽  
Poisson's Ratio ◽  
Negative Poisson’S Ratio ◽  
High Performance Composite ◽  
Negative Poisson's Ratio ◽  
Image Position

Abstract

scholarly journals A systematic typology for negative Poisson's ratio materials and the prediction of complete auxeticity in pure silica zeolite JST

2015 ◽  
Vol 17 (27) ◽  
pp. 17927-17933 ◽  
Author(s):  
M. Siddorn ◽  
F.-X. Coudert ◽  
K. E. Evans ◽  
A. Marmier
Keyword(s):  
Single Crystals ◽  
Elastic Constants ◽  
Poisson’S Ratio ◽  
Poisson's Ratio ◽  
Negative Poisson’S Ratio ◽  
Zeolite Framework ◽  
Pure Silica ◽  
Negative Poisson's Ratio

From experimental elastic constants, partial auxeticity occurs in around 37% of single crystals, average auxeticity is limited to α-cristobalite and complete auxeticity is not observed. Two hundreds pure silica zeolites are simulated and complete auxeticity is found in the JST zeolite framework.

Relaxor Single-Crystal Plates with Nano-Size Ferroelectric Domains Applying to Ultrasonic Prove for Medical Uses

2016 ◽  
Vol 102 ◽  
pp. 57-64
Author(s):  
Toshio Ogawa ◽  
Taiki Ikegaya
Keyword(s):  
Bulk Modulus ◽  
Single Crystal ◽  
Grain Boundaries ◽  
Single Crystals ◽  
Young’S Modulus ◽  
Elastic Constants ◽  
Poisson’S Ratio ◽  
Young's Modulus ◽  
Poisson's Ratio ◽  
Domain Alignment

Sound velocities were measured in relaxor single-crystal plates, included in piezoelectric transducers for medical uses, using an ultrasonic precision thickness gauge with high-frequency pulse generation. The velocities were compared with the ones of piezoelectric ceramics in order to clarify characteristics of the single crystals. Estimating the difference in the sound velocities and elastic constants in the single crystals and ceramics, it was possible to evaluate effects of domain and grain boundaries on elastic constants. Existence of domain boundaries in single crystal affected the decrease in Young’s modulus, rigidity, Poisson’s ratio and bulk modulus. While existence of grain boundaries affected the decrease in Young’s modulus and rigidity, Poisson’s ratio and bulk modulus increased. It was thought these phinomina come from domain alignment by DC poling, and both the boundaries act as to absorb mechanical stress by defects due to the boundaries. In addition, the origin of piezoelectricity in single crystals is caused by low bulk modulus and Poisson’s ratio, and high Young’s modulus and rigidity in comparison with ceramics. On the contrary, the origin of piezoelectricity in ceramics is caused by high Poisson’s ratio by high bulk modulus, and furthermore, low Young’s modulus and rigidity due to domain alignment.

Poisson's ratio in zirconium single crystals

1983 ◽  
Vol 118 (1) ◽  
pp. 78-82 ◽  
Author(s):  
F. Povolo ◽  
R.E. Bolmaro
Keyword(s):  
Single Crystals ◽  
Poisson’S Ratio ◽  
Poisson's Ratio

The Model for Calculating Elastic Modulus and Poisson's Ratio of Coal Body

2013 ◽  
Vol 6 (1) ◽  
pp. 36-43 ◽  
Author(s):  
Ai Chi ◽  
Li Yuwei
Keyword(s):  
Elastic Modulus ◽  
Poisson’S Ratio ◽  
Fractured Rock ◽  
Rock Block ◽  
Poisson's Ratio ◽  
Linear Elastic ◽  
Study Results ◽  
The Face ◽  
Block Face ◽  
Coal Rock

Coal body is a type of fractured rock mass in which lots of cleat fractures developed. Its mechanical properties vary with the parametric variation of coal rock block, face cleat and butt cleat. Based on the linear elastic theory and displacement equivalent principle and simplifying the face cleat and butt cleat as multi-bank penetrating and intermittent cracks, the model was established to calculate the elastic modulus and Poisson's ratio of coal body combined with cleat. By analyzing the model, it also obtained the influence of the parameter variation of coal rock block, face cleat and butt cleat on the elastic modulus and Poisson's ratio of the coal body. Study results showed that the connectivity rate of butt cleat and the distance between face cleats had a weak influence on elastic modulus of coal body. When the inclination of face cleat was 90°, the elastic modulus of coal body reached the maximal value and it equaled to the elastic modulus of coal rock block. When the inclination of face cleat was 0°, the elastic modulus of coal body was exclusively dependent on the elastic modulus of coal rock block, the normal stiffness of face cleat and the distance between them. When the distance between butt cleats or the connectivity rate of butt cleat was fixed, the Poisson's ratio of the coal body initially increased and then decreased with increasing of the face cleat inclination.

Sign in / Sign up

Export Citation Format

Share Document