Microstructure dependence and origin of local energy release in b c c technical superconductors during strain

1981 ◽  
Vol 16 (8) ◽  
pp. 2154-2166 ◽  
Author(s):  
G. Pasztor ◽  
C. Schmidt
Keyword(s):  
Energy Release ◽  
Local Energy

On the Energy Release Rate of Elliptical Cracks in Anisotropic Elastic Media

2003 ◽  
Vol 19 (1) ◽  
pp. 233-239
Author(s):  
Yibin Xue ◽  
Jianmin Qu
Keyword(s):  
Energy Release Rate ◽  
Energy Release ◽  
Crack Opening Displacement ◽  
Release Rate ◽  
Crack Opening ◽  
Average Energy ◽  
Local Energy ◽  
Opening Displacement ◽  
Work Done ◽  
Elliptical Cracks

ABSTRACTThis brief note discusses some issues related to the calculation of energy release rate for elliptical cracks in anisotropic solids. By using the Stroh formalism, analytical expressions of the energy release rate are obtained for elliptical cracks in an unbounded anisotropic solid. Because of material anisotropy and geometric asymmetry of the crack, the local energy release rate varies along the crack front. The average energy release rate can be obtained by integrating the local energy release rate over the entire crack front. On the other hand, the total work done by the crack-surface traction on the entire crack opening displacement can be easily evaluated once the crack opening displacement is known. It is shown that the average energy release rate is equal to the rate of change per unit crack area increment of the work done by the external load on the crack opening displacement.

scholarly journals The surface-forming energy release rate versus the local energy release rate

2017 ◽  
Vol 175 ◽  
pp. 86-100 ◽  
Author(s):  
Si Xiao ◽  
He-ling Wang ◽  
Bin Liu ◽  
Keh-Chih Hwang
Keyword(s):  
Energy Release Rate ◽  
Energy Release ◽  
Release Rate ◽  
Local Energy ◽  
Rate Versus

scholarly journals A critical local energy release rate criterion for fatigue fracture of elastomers

2011 ◽  
Vol 49 (21) ◽  
pp. 1518-1524 ◽  
Author(s):  
Samy Mzabi ◽  
Daniel Berghezan ◽  
Stéphane Roux ◽  
Francois Hild ◽  
Costantino Creton
Keyword(s):  
Energy Release Rate ◽  
Energy Release ◽  
Fatigue Fracture ◽  
Release Rate ◽  
Local Energy ◽  
Energy Release Rate Criterion ◽  
Rate Criterion

Gas dynamics with local energy release in subsonic and supersonic flow

1995 ◽  
Vol 30 (2) ◽  
pp. 275-280 ◽  
Author(s):  
V. V. Vlasov ◽  
B. G. Grudnitskii ◽  
V. N. Rygalin
Keyword(s):  
Supersonic Flow ◽  
Energy Release ◽  
Gas Dynamics ◽  
Local Energy

scholarly journals Rockburst Prediction From the Perspective of Energy Release: A Case Study of a Diversion Tunnel at Jinping II Hydropower Station

2021 ◽  
Vol 9 ◽  
Author(s):  
Yong Fan ◽  
Xianze Cui ◽  
Zhendong Leng ◽  
Junwei Zheng ◽  
Feng Wang ◽  
...  
Keyword(s):  
Rock Mass ◽  
Energy Release ◽  
Brittle Failure ◽  
Strain Energy ◽  
Hydropower Station ◽  
Deep Tunnel ◽  
Local Energy ◽  
Diversion Tunnel ◽  
Jinping Ii Hydropower Station

As a man-made engineering hazard, it is widely accepted that the rockbursts are the result of energy release. Previous studies have examined the unloading of in-situ stress resulting from deep tunnel excavation as a quasi-static process but the transient stress variation during excavation has received less attention. This research discusses rockbursts that happened during the construction of a diversion tunnel at Jinping II hydropower station. The brittle-ductile-plastic (BDP) transition property of Jinping marble was numerically described by the Hoek-Brown strength criterion, and the dynamic energy release process derived from the transient unloading of in-situ stress was studied using an index, local energy release rate. Studies have shown that, due to transient unloading, the strain energy of the surrounding rock mass goes through a dynamic process of decreasing at first, increasing second, then reducing before finally stabilizing. The first decrease of strain energy results from elastic unloading waves and does not cause brittle failure in rock masses, which is consistent with the elastic condition but the secondary reduction of strain energy is because the accumulated strain energy in rock masses exceeds the storage limit, which will inevitably trigger the brittle failure in the rock mass. Thus, the shorter the distance to the tunnel wall the bigger and more intense the energy release. Finally, a relationship between the average value of the local energy release rate and the rockburst intensity was established to assess the risk of rockburst induced by the blasting excavation of a deep tunnel.

Research on Optimization of Excavating Seguence for Dawangou Tunnel

2013 ◽  
Vol 353-356 ◽  
pp. 3703-3706
Author(s):  
Chang Yu Jin ◽  
Pan Pan Zhao ◽  
Chun Fu Xiang ◽  
Zi Feng Xia ◽  
Long Bin Dong ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Rock Mass ◽  
Numerical Analysis ◽  
Energy Release Rate ◽  
Energy Release ◽  
Release Rate ◽  
Brittle Failure ◽  
Hard Rock ◽  
Local Energy ◽  
Change Trend

In response to the limitation of conventional index for stability and optimal design of underground rock mass engineering. The new evaluating indicator, local energy release rate, which can analysis the energy release intensity in the process of the brittle failure of hard rock is used in numerical analysis. Numerical simulation of construction sequence was studied for Dawangou tunnel using energy release rate index and a new constitutive model reflecting the brittle failure of hard rock. Based on the change trend of energy release rate, rock displacement and plastic zone, an optimization excavation is suggested. The optimal excavating sequence could serve as reference in the design and construction.

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