Anisotropic modelling and numerical simulation of brittle damage in concrete

1995 ◽  
Vol 38 (21) ◽  
pp. 3611-3633 ◽  
Author(s):  
Sanjay Govindjee ◽  
Gregory J. Kay ◽  
Juan C. Simo
Keyword(s):  
Numerical Simulation ◽  
Brittle Damage ◽  
Damage In Concrete

Numerical Simulation of Brittle Damage in Concrete Specimens

2005 ◽  
Vol 37 (3) ◽  
pp. 268-281 ◽  
Author(s):  
Y. Labadi ◽  
N. E. Hannachi
Keyword(s):  
Numerical Simulation ◽  
Brittle Damage ◽  
Damage In Concrete

scholarly journals Numerical simulation for fracture network evolution in coal-bearing gas reservoir reconstruction based on damage theory

2021 ◽  
Vol 25 (6 Part B) ◽  
pp. 4423-4429
Author(s):  
Hai-Xiao Lin ◽  
Qiu-Yu Pan ◽  
Bang-Hua Yao ◽  
Wen-Long Shen ◽  
Feng Yang
Keyword(s):  
Numerical Simulation ◽  
Mechanical Response ◽  
Coupling Effect ◽  
Fracture Network ◽  
Network Evolution ◽  
Geological Strength Index ◽  
Forming Process ◽  
Brittle Damage ◽  
Coal Rock ◽  
Numerical Calculation Method

Based on the characteristics of mechanical response of coal rock under loading, an elastic-brittle damage constitutive relation of coal rock has been proposed, which has been extended to the 3-D stress state, based on the geological strength index. Besides, a numerical calculation method based on the elastic-brittle damage the?ory has been developed, by analyzing the seepage-stress coupling effect. Then, a computing program for fracture network transformation has been composed to perform numerical simulation of forming process of coal rock under different working conditions, by the APDL language in the ANSYS software platform. The mechanical mechanism of fracture network forming process of coal rock has been further analyzed.

scholarly journals The Use of Dijkstra’s Algorithm in Assessing the Correctness of Imaging Brittle Damage in Concrete Beams by Means of Ultrasonic Transmission Tomography

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 551 ◽  
Author(s):  
Zbigniew Perkowski ◽  
Karolina Tatara
Keyword(s):  
Wave Propagation ◽  
Damage Mechanics ◽  
Concrete Beams ◽  
Tomographic Reconstruction ◽  
Ultrasonic Tomography ◽  
Dijkstra’S Algorithm ◽  
Brittle Damage ◽  
Dijkstra's Algorithm ◽  
Propagation Paths ◽  
Damage In Concrete

The accuracy of transmission ultrasonic tomography for the detection of brittle damage in concrete beams can be effectively supported by the graph theory and, in particular, by Dijkstra’s algorithm. It allows determining real paths of the fastest ultrasonic wave propagation in concrete containing localized elastically degraded zones at any stage of their evolution. This work confronts this type of approach with results that can be obtained from non-local isotropic damage mechanics. On this basis, the authors developed a method of reducing errors in tomographic reconstruction of longitudinal wave velocity maps which are caused by using the simplifying assumptions of straightness of the fastest wave propagation paths. The method is based on the appropriate elongation of measured propagation times of the wave transmitted between opposite sending-receiving transducers if the actual propagation paths deviate from straight lines. Thanks to this, the mathematical apparatus used typically in the tomography, in which the straightness of the fastest paths is assumed, can be still used. The work considers also the aspect of using fictitious wave sending-receiving points in ultrasonic tomography for which wave propagation times are calculated by interpolation of measured ones. The considerations are supported by experimental research conducted on laboratory reinforced concrete (RC) beams in the test of three-point bending and a prefabricated damaged RC beam.

Water uptake by substituted amylose tablets: experimentation and numerical simulation

2009 ◽  
Vol 00 (00) ◽  
pp. 090904073309027-8
Author(s):  
H.W. Wang ◽  
S. Kyriacos ◽  
L. Cartilier
Keyword(s):  
Numerical Simulation ◽  
Water Uptake
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