Plastic-strain-dependent strength model to simulate the cracking process of brittle rocks with an existing non-persistent joint

2017 ◽  
Vol 231 ◽  
pp. 114-125 ◽  
Author(s):  
Songfeng Guo ◽  
Shengwen Qi ◽  
Zhifa Zhan ◽  
Bowen Zheng
Keyword(s):  
Plastic Strain ◽  
Strength Model ◽  
Brittle Rocks ◽  
Cracking Process ◽  
Strain Dependent

Anisotropic plasticity model coupled with strain dependent plastic strain and stress ratios

CIRP Annals ◽  
2013 ◽  
Vol 62 (1) ◽  
pp. 283-286
Author(s):  
Wolfram Volk ◽  
Jae Kun Kim ◽  
Joungsik Suh ◽  
Hartmut Hoffmann
Keyword(s):  
Plastic Strain ◽  
Plasticity Model ◽  
Anisotropic Plasticity ◽  
Stress Ratios ◽  
Strain Dependent

Controlling Edge Effects in Laser Bending

2012 ◽  
Vol 271-272 ◽  
pp. 1521-1525
Author(s):  
Hong Shen ◽  
Jun Hu
Keyword(s):  
Plastic Strain ◽  
Sheet Metal ◽  
Edge Effects ◽  
Time History ◽  
Laser Forming ◽  
Spring Back ◽  
Laser Bending ◽  
Mechanical Process ◽  
New Strategy ◽  
Strain Dependent

Laser forming of sheet metal offers the advantages of requiring no hard tooling, no spring back and no external force. Thus this technology reduces cost, increases flexibility and accuracy. Laser forming is a complicated and transient thermo-mechanical process involving elastic and plastic strain dependent on time history. How to control and enhance the accuracy of the laser forming attracts much attention. This paper put forward a new strategy to control and reduce the edge effects in laser forming. Numerical simulations and experiments were also carried out to validate the presented strategy.

Determination of confinement and plastic strain dependent post-peak strength of intact rocks

2017 ◽  
Vol 218 ◽  
pp. 187-196 ◽  
Author(s):  
Jun Peng ◽  
Ming Cai ◽  
Guan Rong ◽  
Meng-Di Yao ◽  
Qing-Hui Jiang ◽  
...  
Keyword(s):  
Plastic Strain ◽  
Peak Strength ◽  
Strain Dependent

EXPERIMENT STUDY ON MECHANICAL PROPERTIES OF GRANITE UNDER REPEATED LOADING AND UNLOADING

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1634-1639 ◽  
Author(s):  
YUN-HUA HU ◽  
QUAN-SHENG LIU
Keyword(s):  
Acoustic Emission ◽  
Plastic Strain ◽  
Axial Stiffness ◽  
Repeated Loading ◽  
Testing System ◽  
Lateral Stiffness ◽  
Internal Damage ◽  
Brittle Rocks ◽  
Loading And Unloading ◽  
Change Trend

Deformation rules and acoustic emission characteristics of granite under repeated loading-unloading are studied using the MTS Mechanics Testing System and Disp. acoustic emission instrument. It's found that the axial stiffness of granite as well as Poisson's ratio increases with the development of the plastic strain while the change trend of lateral stiffness is negative. For brittle rocks, strain is produced by three mechanisms: elastic deformation, axial micro-cracking and compaction. The peak AE rate is increasing with the plastic strain, which indicates that using the axial plastic strain as the internal damage variable to represent rock damage is reasonable.

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