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A general tangent operator applied to concrete using a multi-surface plasticity model
Ana Beatriz C.G. Silva,Jose Claudio F. Telles,Eduardo M.R. Fairbairn,Fernando Luiz B. Ribeiro 사단법인 한국계산역학회 2015 Computers and Concrete, An International Journal Vol.16 No.2
The present paper aims at developing a method to accommodate multi-surface concrete plasticity from the point of view of a consistency concept applied to general tangent operators. The idea is based on a Taylor series expansion of the actual effective stress at the stress point corresponding to the previous accumulated true stresses plus the current increment values, initially taken to be elastic. The proposed algorithm can be generalized for any multi-surface criteria combination and has been tested here for typical cement-based materials. A few examples of application are presented to demonstrate the effectiveness of the multi-surface technique as used to a combination of Rankine and Drucker-Prager yield criteria.
Modeling refractory concrete lining of fluid catalytic cracking units of oil refineries
Ana B.C.G. Silva,Henrique C.C. Andrade,Eduardo M.R. Fairbairn,Jose C.F. Telles,Fernando L.B. Ribeiro,Romildo D. Toledo-Filho,Jorivaldo Medeiros 사단법인 한국계산역학회 2020 Computers and Concrete, An International Journal Vol.25 No.1
This work presents a numerical modeling procedure to simulate the refractory concrete lining in fluid catalytic cracking units of oil refineries. The model includes the simulation of the anchors that reinforce the contact between the refractory concrete and the steel casing. For this purpose, the constitutive relations of an interface finite element are set to values that represent the homogenized behavior of the anchored interface. The parameters of this constitutive relation can be obtained by experimental tests. The model includes also multi-surface plasticity, in order to represent the behavior of the refractory concrete lining. Since the complexity of real case applications leads to high computational costs, the models presented here were implemented in a high-performance parallelized finite element platform. A case study representing a riser similar to the ones used by the refinery industry demonstrates the potential of the model.