Multi-field coupling effect of deep excavation under the stress path of unloading

2014 ◽  
pp. 421-426
Keyword(s):  
Coupling Effect ◽  
Stress Path ◽  
Deep Excavation ◽  
Field Coupling

Numerical study of the evanescent field coupling effect on two optical fiber sensors

2019 ◽  
Author(s):  
Nursyahida M. Hasan ◽  
K. N. Mutter ◽  
M. Z. Matjafri ◽  
H. San Lim ◽  
S. Yeoh ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Coupling Effect ◽  
Numerical Study ◽  
Optical Fiber Sensors ◽  
Evanescent Field ◽  
Fiber Sensors ◽  
Field Coupling

Finite Element Analysis for Comprehensive Residual Stress of 7075 Aluminum Alloy Thick Plate

2010 ◽  
Vol 154-155 ◽  
pp. 1255-1261
Author(s):  
Hai Yan Li ◽  
Yi Du Zhang ◽  
Hong Wei Zhang
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Aluminum Alloy ◽  
Thick Plate ◽  
Coupling Effect ◽  
Element Model ◽  
Forming Process ◽  
Element Analysis ◽  
Field Coupling ◽  
Simulation And Experiment

Based on “physical field coupling” finite element method, the generation of residual stress and interactive coupling effect were analyzed during the forming process of aluminum alloy thick-plate. Therefore, comprehensive residual stress generated from rolling, quenching and stretching was obtained. The finite element model was proved effective by comparing the results of simulation and experiment. Results show that percent reduction has significant influence to the distribution and magnitude of rolling stress; There is a coupling effect between rolling stress and quenching stress, which represents a basic state; Furthermore, after stretching the distribution of coupling stress remains, but the value reduces greatly; The residual stress has got the minimum, when stretching is near 3%.

Sensitivity Analysis of Parameters in SYS Cam-Clay Model

2014 ◽  
Vol 1030-1032 ◽  
pp. 864-870
Author(s):  
Bin Bin Xu ◽  
Toshihiro Noda ◽  
Kentaro Nakai
Keyword(s):  
Sensitivity Analysis ◽  
Coupling Effect ◽  
Stress Path ◽  
State Theory ◽  
Degradation Index ◽  
Overconsolidation Ratio ◽  
Clay Model ◽  
Structure Degradation ◽  
Rotational Hardening ◽  
Cam Clay

The SYS Cam-clay model, which is extended based on the Cam-clay model and the critical state theory, is able to describe the heavily overconsolidated and structure soils. However compared with Cam-clay model with five elasto-plastic parameters there are six additional evolutional parameters in SYS Cam-clay model and the sensitivity analysis of the new added parameters should be carried out. Through the calculation of constitutive response assuming the uniform deformation field, the sensitivities of degradation index of structure, degradation index of overconsolidation ratio and rotational hardening index are investigated respectively. It can be seen that the peak strength and the “rewinding behavior” in the effective stress path are influenced greatly while there is no coupling effect of these parameters mutually. The initial overconsolidation ratio and degree of structure also have an effect on the mechanical behavior and the initial specific volume.

Unloading Characteristics of Hard Rock at Depth

2011 ◽  
Vol 243-249 ◽  
pp. 2205-2210
Author(s):  
Ying Hui Lv ◽  
Xia Ting Feng ◽  
Jun Yan Liu
Keyword(s):  
Deformation Modulus ◽  
Volumetric Strain ◽  
Confining Pressure ◽  
Stress Path ◽  
Deep Excavation ◽  
Power Station ◽  
Failure Characteristics ◽  
Excavation Process ◽  
Rock Tunnels ◽  
Coulomb Criterion

DaGangShan power station in China is being excavation at 1500 meters deep below earth surface, where the surrounding rock is affected by high initial geo-stress. Deep excavation of rock tunnels causes release of high initial geo-stress and produces unloading action. As thus, a series of representative unloading tests on hard granite from DaGangShan power station are carried out to simulate dynamically excavation process, and in unloading tests, the stress path of decreasing confining pressure along with increasing axial pressure is accepted. The results of tests show as follows: (1) Under unloading condition, lateral deformation occurs in the unloading direction and volumetric strain changes from compression deformation to dilation deformation. (2) Under unloading condition, crack deformation appears, which results in Poisson’s ration rise and deformation modulus decrease. (3) Under unloading condition, hard granites behave brittle failure and Mogi-coulomb criterion can well describe the failure characteristics.

Near-field coupling effect in normal-incidence absorption of quantum-well infrared photodetectors

1999 ◽  
Vol 85 (2) ◽  
pp. 1237-1239 ◽  
Author(s):  
Y. Y. Fu ◽  
M. Willander ◽  
W. Lu ◽  
W. L. Xu ◽  
Ning Li ◽  
...  
Keyword(s):  
Quantum Well ◽  
Coupling Effect ◽  
Near Field ◽  
Normal Incidence ◽  
Infrared Photodetectors ◽  
Field Coupling ◽  
Quantum Well Infrared Photodetectors

An Integrated Measurement System for Pyromagnetic Effect of Prefabricated Defects Polymer Materials

2014 ◽  
Vol 519-520 ◽  
pp. 1121-1128
Author(s):  
Yong Zhong Zhang ◽  
Ying She Luo ◽  
Jian Xin Su ◽  
Sheng Ming Chen ◽  
Jia Ren ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Measurement System ◽  
Coupling Effect ◽  
Tensile Load ◽  
Polymer Materials ◽  
System Structure ◽  
Good Test ◽  
Measurement Systems ◽  
Field Coupling ◽  
Software Interface

There exist multi-field coupling effect in prefabricated defects polymer materials under loading. For understanding the pyromagnetic effect, it is crucial to accurately measure the coupling relations of the key physical quantities about displacement, tensile load, temperature, and magnetic field. To overcome the obstacle in current measurement systems for synchronized measurement, an integrated measurement system for multi-field coupling detection is presented to enable synchronized, automatic detection. This paper introduces the system structure, software design, and the detailed design of varied-speed PID control methods. Test results show that, the system is effective for valid data acquisition for displacement, tension load, temperature and magnetic field of a high polymer Polyvinyl Chloride (PVC) plate sample under constant tensile load, and all test data can be visualized on the software interface. This system provides a good test platform for further research on pyromagnetic effect of PVC plate.

Concurrent Scanning Double-Tip-Enhanced Raman Scattering by Near-Field Coupling Effect

Plasmonics ◽  
2015 ◽  
Vol 11 (1) ◽  
pp. 247-252 ◽  
Author(s):  
Qinnan Zhang ◽  
Xiaoxu Lu ◽  
Yingjie Yuan ◽  
Daosen Zhang ◽  
Jiaosheng Li ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Coupling Effect ◽  
Near Field ◽  
Field Coupling ◽  
Enhanced Raman Scattering
Sign in / Sign up

Export Citation Format

Share Document