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Article
Publication date: 1 February 1984

N.A. Stipho

Introduction It is generally accepted that industrial systems in the majority of developing countries operate at lower efficiency and productivity levels than those in developed…

96

Abstract

Introduction It is generally accepted that industrial systems in the majority of developing countries operate at lower efficiency and productivity levels than those in developed countries. For this reason, developing countries have the urgent problems of not only having to compete against time to narrow the technological gap and keep pace with developing new technologies, but also to improve the productivity and efficiency of their operating industrial systems.

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International Journal of Quality & Reliability Management, vol. 1 no. 2
Type: Research Article
ISSN: 0265-671X

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Article
Publication date: 1 June 1985

The librarian and researcher have to be able to uncover specific articles in their areas of interest. This Bibliography is designed to help. Volume IV, like Volume III, contains…

12736

Abstract

The librarian and researcher have to be able to uncover specific articles in their areas of interest. This Bibliography is designed to help. Volume IV, like Volume III, contains features to help the reader to retrieve relevant literature from MCB University Press' considerable output. Each entry within has been indexed according to author(s) and the Fifth Edition of the SCIMP/SCAMP Thesaurus. The latter thus provides a full subject index to facilitate rapid retrieval. Each article or book is assigned its own unique number and this is used in both the subject and author index. This Volume indexes 29 journals indicating the depth, coverage and expansion of MCB's portfolio.

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Management Decision, vol. 23 no. 6
Type: Research Article
ISSN: 0025-1747

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Article
Publication date: 19 April 2023

Luying Ju, Zihai Yan, Mingming Wu, Gangping Zhang, Jiajia Yan, Tianci Yu, Pan Ding and Riqing Xu

The purpose of this paper is to suggest an implicit integration method for updating the constitutive relationships in the newly proposed anisotropic egg-shaped elastoplastic…

93

Abstract

Purpose

The purpose of this paper is to suggest an implicit integration method for updating the constitutive relationships in the newly proposed anisotropic egg-shaped elastoplastic (AESE) model and to apply it in ABAQUS.

Design/methodology/approach

The implicit integration algorithm based on the Newton–Raphson method and the closest point projection scheme containing an elastic predictor and plastic corrector are implemented in the AESE model. Then, the integration code for this model is incorporated into the commercial finite element software ABAQUS through the user material subroutine (UMAT) interface to simulate undrained monotonic triaxial tests for various saturated soft clays under different consolidation conditions.

Findings

The comparison between the simulated results from ABAQUS and the experimental results demonstrates the satisfactory performance of this implicit integration algorithm in terms of effectiveness and robustness and the ability of the proposed model to predict the characteristics of soft clay.

Research limitations/implications

The rotational hardening rule in the AESE model together with the implicit integration algorithm cannot be considered.

Originality/value

The singularity problem existing in most elastoplastic models is eliminated by the closed, smooth and flexible anisotropic egg-shaped yield surface form in the AESE model. In addition, this notion leads to an efficient implicit integration algorithm for updating the highly nonlinear constitutive equations for unsaturated soft clay.

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Engineering Computations, vol. 40 no. 3
Type: Research Article
ISSN: 0264-4401

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Article
Publication date: 1 March 1988

A. Gens and D.M. Potts

Elasto‐plastic models based on critical state formulations have been successful in describing many of the most important features of the mechanical behaviour of soils. This review…

1082

Abstract

Elasto‐plastic models based on critical state formulations have been successful in describing many of the most important features of the mechanical behaviour of soils. This review paper deals with the applications of this class of models to the numerical analysis of geotechnical problems. After a brief overview of the development of the models, the basic critical state formulation is presented together with the main modifications which have actually been used in computational applications. The problems associated with the numerical implementation of this type of models are then discussed. Finally, a summary of reported computational applications and some specific examples of analyses of geotechnical problems using critical state models are presented.

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Engineering Computations, vol. 5 no. 3
Type: Research Article
ISSN: 0264-4401

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