Tensile strain effects on C4N3H monolayer: Large Poisson's ratio and robust Dirac cone

2019 ◽  
Vol 114 (7) ◽  
pp. 073106 ◽  
Author(s):  
Hongzhe Pan ◽  
Hongyu Zhang ◽  
Jianfu Li ◽  
Qingfang Li ◽  
Yuanyuan Sun ◽  
...  
Keyword(s):  
Poisson’S Ratio ◽  
Tensile Strain ◽  
Poisson's Ratio ◽  
Dirac Cone ◽  
Strain Effects

scholarly journals Stable planar single-layer hexagonal silicene under tensile strain and its anomalous Poisson's ratio

2014 ◽  
Vol 104 (8) ◽  
pp. 081902 ◽  
Author(s):  
Baolin Wang ◽  
Jiangtao Wu ◽  
Xiaokun Gu ◽  
Hanqing Yin ◽  
Yujie Wei ◽  
...  
Keyword(s):  
Poisson’S Ratio ◽  
Tensile Strain ◽  
Single Layer ◽  
Poisson's Ratio

Low-energy 3D sp2 carbons with versatile properties beyond graphite and graphene

2018 ◽  
Vol 47 (17) ◽  
pp. 6233-6239 ◽  
Author(s):  
Meng Hu ◽  
Xiao Dong ◽  
Yingju Wu ◽  
Lingyu Liu ◽  
Zhisheng Zhao ◽  
...  
Keyword(s):  
Poisson’S Ratio ◽  
Graphene Nanoribbons ◽  
Low Energy ◽  
Poisson's Ratio ◽  
Negative Poisson’S Ratio ◽  
Dirac Cone ◽  
Negative Poisson's Ratio

Low-energy sp2-carbons with metallicity, graphene-like Dirac cone, rubber-like ultra-stretchability, and negative Poisson's ratio are theoretically designed from graphene nanoribbons.

scholarly journals Structural deformation and mechanical response of CrS2, CrSe2 and Janus CrSSe

2021 ◽  
Author(s):  
Shambhu Bhandari Sharma ◽  
Ramesh Paudel ◽  
Rajendra Adhikari ◽  
Gopi Chandra Kaphle ◽  
Durga Paudyal
Keyword(s):  
Poisson’S Ratio ◽  
Density Functional ◽  
Tensile Strain ◽  
Mechanical Response ◽  
Axial Stress ◽  
Covalent Bond ◽  
Poisson's Ratio ◽  
Structural Deformation ◽  
Plastic Behavior ◽  
Potential Candidate

In the framework of density functional theory (DFT), we investigate the structural deformation, and mechanical behavior of the Janus CrSSe, which has out-of-plane structural asymmetry, with conventional transition metal dichalcogenides (TMDs) CrS2 and CrSe2 . The Janus CrSSe could be a potential candidate for machinable optoelectronic and piezoelectric applications. We predict that these compounds are chemically, mechanically, and dynamically stable with the covalent bond between the TM(Cr) and chalcogen(X=S, Se) atoms. Due to the influence of tensile strain, the Cr-X bond length of each monolayers increases, and the thickness decreases. Interestingly, the in-plane stiffness, shear and layer moduli, Poisson’s ratio, ultimate bi/uni-axial stress of Janus CrSSe are in between the values of CrS2 and CrSe2 monolayers. Similar to TMDs, the orientation-dependent in-plane stiffness and Poisson’s ratio demonstrate the isotropic behavior in Janus CrSSe. Furthermore, it can sustain a larger value of uni/bi-axial tensile strain with the critical strain equivalent to CrX2 monolayers. By applying higher-order strain, we have also found average elastic-plastic behavior as expected. These findings demonstrate that the Janus CrSSe monolayer is a mechanically stable and ductile compound that maintains the hybrid behavior.

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.

scholarly journals A Hybrid Artificial Intelligence Model to Predict the Elastic Behavior of Sandstone Rocks

2019 ◽  
Vol 11 (19) ◽  
pp. 5283 ◽  
Author(s):  
Gowida ◽  
Moussa ◽  
Elkatatny ◽  
Ali
Keyword(s):  
Poisson’S Ratio ◽  
Accurate Determination ◽  
Oil And Gas Industry ◽  
Poisson's Ratio ◽  
Elastic Behavior ◽  
Percentage Error ◽  
Ann Model ◽  
Field Development ◽  
Well Completion

Rock mechanical properties play a key role in the optimization process of engineering practices in the oil and gas industry so that better field development decisions can be made. Estimation of these properties is central in well placement, drilling programs, and well completion design. The elastic behavior of rocks can be studied by determining two main parameters: Young’s modulus and Poisson’s ratio. Accurate determination of the Poisson’s ratio helps to estimate the in-situ horizontal stresses and in turn, avoid many critical problems which interrupt drilling operations, such as pipe sticking and wellbore instability issues. Accurate Poisson’s ratio values can be experimentally determined using retrieved core samples under simulated in-situ downhole conditions. However, this technique is time-consuming and economically ineffective, requiring the development of a more effective technique. This study has developed a new generalized model to estimate static Poisson’s ratio values of sandstone rocks using a supervised artificial neural network (ANN). The developed ANN model uses well log data such as bulk density and sonic log as the input parameters to target static Poisson’s ratio values as outputs. Subsequently, the developed ANN model was transformed into a more practical and easier to use white-box mode using an ANN-based empirical equation. Core data (692 data points) and their corresponding petrophysical data were used to train and test the ANN model. The self-adaptive differential evolution (SADE) algorithm was used to fine-tune the parameters of the ANN model to obtain the most accurate results in terms of the highest correlation coefficient (R) and the lowest mean absolute percentage error (MAPE). The results obtained from the optimized ANN model show an excellent agreement with the laboratory measured static Poisson’s ratio, confirming the high accuracy of the developed model. A comparison of the developed ANN-based empirical correlation with the previously developed approaches demonstrates the superiority of the developed correlation in predicting static Poisson’s ratio values with the highest R and the lowest MAPE. The developed correlation performs in a manner far superior to other approaches when validated against unseen field data. The developed ANN-based mathematical model can be used as a robust tool to estimate static Poisson’s ratio without the need to run the ANN model.

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