A New Approach of Rock Cutting Efficiency Evaluation by using Plastic Energy Dissipation Ratio

2018 ◽  
Vol 23 (2) ◽  
pp. 879-888
Author(s):  
Weiji Liu ◽  
Xiaohua Zhu
Keyword(s):  
Energy Dissipation ◽  
Rock Cutting ◽  
Efficiency Evaluation ◽  
Cutting Efficiency ◽  
New Approach ◽  
Plastic Energy ◽  
Energy Dissipation Ratio

scholarly journals Structural damage identification based on gray cloud rule generator algorithm

2019 ◽  
Vol 11 (1) ◽  
pp. 168781401881990 ◽  
Author(s):  
Hui-Yong Guo ◽  
He-Fa Yuan ◽  
Qi Huang
Keyword(s):  
Energy Dissipation ◽  
Structural Damage ◽  
Strain Energy ◽  
Damage Identification ◽  
Cloud Model ◽  
Structure Model ◽  
Cloud Droplets ◽  
Modal Strain Energy ◽  
Energy Dissipation Ratio ◽  
Better Than

It is difficult for the traditional methods to identify uncertain damage problems caused by noise. Therefore, a gray cloud rule generator algorithm based on cloud model and modal strain energy is presented to solve the problems. Cloud model can simulate both randomness and fuzziness with fixed parameters. Therefore, it is applicable for the uncertain damage problems. First, modal strain energy and modal strain energy dissipation ratio index are introduced. Then, numerical characteristics of a cloud model are described and some cloud generators are analyzed. Finally, a gray cloud rule is proposed and the gray cloud rule generator algorithm based on the gray cloud rule generator and modal strain energy is developed. The interference of uncertain noise is reduced through a large number of cloud droplets. A two-dimensional truss structure model has been used to verify the effectiveness of the algorithm. The results indicate that the proposed gray cloud rule generator algorithm is applicable to identify the uncertain damage caused by noise, and the identification results of the proposed method are relatively better than those of modal strain energy dissipation ratio index.

Experimental study and numerical simulation of clapboard lead damper

2016 ◽  
Vol 231 (9) ◽  
pp. 1688-1698 ◽  
Author(s):  
SL Cheng ◽  
SY Du ◽  
XS Yan ◽  
Q Guo ◽  
YJ Xin
Keyword(s):  
Finite Element ◽  
Energy Dissipation ◽  
Type A ◽  
Loading Test ◽  
Plastic Energy ◽  
Yield Displacement ◽  
Lead Metal ◽  
Reduction Effect ◽  
Hysteretic Properties ◽  
Good Agreement

Two types of clapboard-type lead dampers were designed based on plastic energy absorption of lead metal. The hysteretic curves and energy dissipation properties were studied through low cyclic loading test. Also, the typical restoring load model was extracted. The finite-element numerical model of type-A damper was build according to the characteristics and principle of clapboard-type lead dampers. And the damping effect of high-structural Benchmark model installed with type-A damper was analyzed. The results show that the structure of clapboard-type lead dampers is simple, hysteretic curves are plump, hysteretic properties are steady and yield displacement is small, and thus its energy dissipation ability is excellent. The models of finite element and restoring load of dampers are in good agreement with the results of tests, so they have good applicability. The seismic system installed with type-A dampers has an excellent vibration reduction effect. The top-floor acceleration and displacement control effects are 26.7% and 37.4%, respectively.

scholarly journals Dynamic Crushing Analysis of a Three-Dimensional Re-Entrant Auxetic Cellular Structure

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 460 ◽  
Author(s):  
Tao Wang ◽  
Zhen Li ◽  
Liangmo Wang ◽  
Zhengdong Ma ◽  
Gregory Hulbert
Keyword(s):  
Energy Dissipation ◽  
Relative Density ◽  
Cellular Structure ◽  
Three Dimensional ◽  
Analytical Formula ◽  
Absorption Capacity ◽  
Plastic Energy ◽  
Theoretical Predictions ◽  
Auxetic Structure

Dynamic behaviors of the three-dimensional re-entrant auxetic cellular structure have been investigated by performing beam-based crushing simulation. Detailed deformation process subjected to various crushing velocities has been described, where three specific crushing modes have been identified with respect to the crushing velocity and the relative density. The crushing strength of the 3D re-entrant auxetic structure reveals to increase with increasing crushing velocity and relative density. Moreover, an analytical formula of dynamic plateau stress has been deduced, which has been validated to present theoretical predictions agreeing well with simulation results. By establishing an analytical model, the role of relative density on the energy absorption capacity of the 3D re-entrant auxetic structure has been further studied. The results indicate that the specific plastic energy dissipation is increased by increasing the relative density, while the normalized plastic energy dissipation has an opposite sensitivity to the relative density when the crushing velocity exceeds the critical transition velocity. The study in this work can provide insights into the dynamic property of the 3D re-entrant auxetic structure and provides an extensive reference for the crushing resistance design of the auxetic structure.

Plastic energy dissipation in mixed-mode fracture

1995 ◽  
Vol 73 (1) ◽  
pp. R3-R8 ◽  
Author(s):  
V. Boniface ◽  
K. R. Y. Simha
Keyword(s):  
Energy Dissipation ◽  
Mixed Mode ◽  
Mixed Mode Fracture ◽  
Mode Fracture ◽  
Plastic Energy

Plastic energy dissipation during crack extension

1973 ◽  
Vol 9 (3) ◽  
pp. 345-348 ◽  
Author(s):  
S. K. Bhandari
Keyword(s):  
Energy Dissipation ◽  
Crack Extension ◽  
Plastic Energy

Optimal Structural Topology Design for Energy Absorption: A Heuristic Approach

2001 ◽  
Author(s):  
Ciro A. Soto
Keyword(s):  
Energy Dissipation ◽  
Kinetic Energy ◽  
Porous Materials ◽  
Numerical Experiments ◽  
Topology Design ◽  
Design Rule ◽  
Structural Domain ◽  
Structural Topology ◽  
New Approach ◽  
Structural Topology Design

Abstract A new approach to design the topology for structures under crash events is presented. The approach is heuristic in essence, but numerical experiments have shown its uses in real problems. Using an interpolation between porous and solid (non-porous) materials plus a re-design rule to by-pass gradient computations the new approach is able to determine better locations of material and density in a given structural domain for kinetic energy dissipation. An example is presented to illustrate the methodology.

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