T.C.K. Molyneaux

Bio: T.C.K. Molyneaux is an academic researcher from University of Liverpool. The author has contributed to research in topics: Unreinforced masonry building & Masonry. The author has an hindex of 7, co-authored 13 publications receiving 130 citations.

Dynamic constitutive equations and behaviour of brass at high strain rates

Abstract: This paper presents an experimental study of the mechanical properties of brass at high strain rates. The brass tested is the copperzinc alpha-beta and beta two-phase alloy in the cold-worked state. Experiments were conducted using an extended tension split Hopkinson bar apparatus. It is found that, at lower strain rates, the stress-strain curve is smooth, exhibiting no well-defined yield stress, but at higher strain rates the stress-strain curve not only shows a well-defined yield stress but also displays a very pronounced drop in stress at yield. The flow stress is found to increase with increasing strain rate, but the increase is more significant for the yield stress than for the flow stress, showing that the yield stress is more sensitive to the strain rate than the flow stress away from the yield point. Based on the experimental results, empirical strain-rate-dependent constitutive equations are recommended. The suggested constitutive equations provide a reasonable estimate of the strain-rate-sensiti...

Dynamic elastic instability of long circular cylindrical shells under pure bending

Abstract: The present paper studies the responses and instabilities of long circular cylindrical shells subjected to dynamic pure bending The dynamic instability characteristics of the shells subjected to a sudden step bending load of infinite duration are explored Analysis is performed using nonlinear finite element numerical methods Critical dynamic moments are determined through the use of Budiansky and Routh's stability criterion Numerical predictions for the dynamic instability are compared with those static results given earlier by Brazier The effects of shell geometry on the dynamic stability of the shells are shown It is found that the dominating factor to affect the shell stability is the ovalization of the shell cross-section in the centre of the shell

Buckling of Thin Shells: Recent Advances and Trends

Abstract: This paper provides a review of recent research advances and trends in the area of thin shell buckling. Only the more important and interesting aspects of recent research, judged from a personal view point, are discussed. In particular, the following topics are given emphasis: (a) imperfections in real structures and their influence; (b) buckling of shells under local/non-uniform loads and localized compressive stresses; and (c) the use of computer buckling analysis in the stability design of complex thin shell structures. I INTRODUCTION Thin-shell structures find wide applications in many branches of engineering. Examples include aircraft, spacecraft, cooling towers, nuclear reactors, steel silos and tanks for bulk solid and liquid storage, pressure vessels, pipelines and offshore platforms. Because of the thinness of these structures, buckling is often the controlling failure mode. It is therefore essential that their buckling behavior be properly understood so that suitable design methods can be established. This paper provides a review of recent research advances and trends in the area of thin shell buckling. The paper is not intended to be an exhaustive review of the field, nor is it possible to do so in a single paper of limited length. Instead, only the more important and interesting aspects of recent research, judged from a personal viewpoint, will be discussed. In particular, the following topics are given emphasis: (a) imperfections in real structures and their influence; (b) buckling of shells under local/non-uniform loads and localized compressive stresses; and (c) the use of computer buckling analysis in the stability design of complex thin shell structures. The author wishes to apologize in advance for any inadvertent omission of relevant publications.