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Researchers develop advanced model to improve safety of next-generation reactors

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IMAGE: Pebble-bed reactors use passive natural circulation to cool down, making it theoretically impossible for a core meltdown to occur.
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Credit: Dr. Jean Ragusa and Dr. Mauricio Eduardo Tano Retamales/Texas A&M University Engineering
When one of the largest modern earthquakes struck Japan on March 11, 2011, the nuclear reactors at Fukushima-Daiichi automatically shut down, as designed. The emergency systems, which would have helped maintain the necessary cooling of the core, were destroyed by the subsequent tsunami. Because the reactor could no longer cool itself, the core overheated, resulting in a severe nuclear meltdown, the likes of which haven t been seen since the Chernobyl disaster in 1986. ....

United States , Jean Ragusa , Department Of Energy , Nuclear Technology , Mauricio Eduardo Tano Retamales , Nuclear Engineering , Bypass Flows , Pebble Bed Reactor , Discrete Element Method , ஒன்றுபட்டது மாநிலங்களில் , துறை ஆஃப் ஆற்றல் , அணு தொழில்நுட்பம் , அணு பொறியியல் , கூழாங்கல் படுக்கை ரியாக்டர் , தனித்தனி உறுப்பு முறை ,

"Discrete element method using cohesive plastic beam for modeling elast" by Vinh D.X. Nguyen, A. Kiet Tieu et al.

Abstract
This paper introduces a three-dimensional (3D) simulation to model the elasto-plastic deformation of ductile materials by discrete element method (DEM) using cohesive plastic beam approach. The Euler–Bernoulli beam theory is applied to calculate force and torque reactions of the cohesive beam bond that can account for plastic strain. In order to simulate the elasto-plastic behavior of materials, a coupled model of plasticity and damage is proposed for the cohesive beam bond. The von Mises yield criterion, a modified perfectly plastic law and an exponential damage law are implemented to simulate behaviors of ductile materials such as steel and aluminum in tensile tests. It is then further applied to investigate the ductile fracture modes such as localized shear fracture and necking phenomenon with cup-and-cone shape. Finally, the proposed DEM model using cohesive plastic beam is applied to visualize the compression test of cylindrical steel sample and wrinkle deforma ....

Cohesive Beam Model , Discrete Element Method , Uctile Materials , Arge Deformation ,

ESSS Rocky DEM 4.4.2 (x64)

ESSS Rocky DEM 4.4.2 (x64)
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