Non-linear Mechanical Behaviour of Metallic Micro-wires under Dynamic Axial Loads

In order to model the mechanical behaviour of an austenitic-ferritic duplex stainless steel thanks to "composite" micromechanical non-linear models, its microstructure was analysed and the mechanical behaviour of each phase was characterised. The microstructural morphology of this steel was studied by selective dissolution of the austenitic phase. The microstructure consists of unconnected austenite islands dispersed in a ferritic matrix. Nano-indentation tests were carried out on each phase. These tests allowed to obtain the hardness and the Young modulus of each phase. A non-linear homogenization approach (secant and incremental formulations) was implemented and the results were compared to the monotonous macroscopic tensile tests carried out at constant strain rate. It allowed us to evaluate the relevance of the non-linear homogeneization models for the description of the elasto-plastic behaviour of the studied duplex stainless steel.

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Mechanical behaviour and non-linear analysis of short beams using softened truss and direct strut & tie models

Engineering Structures ◽

10.1016/j.engstruct.2004.12.003 ◽

2005 ◽

Vol 27 (4) ◽

pp. 639-651 ◽

Cited By ~ 15

Author(s):

P.G. Bakir ◽

H.M. Boduroǧlu

Keyword(s):

Mechanical Behaviour ◽

Linear Analysis ◽

Non Linear

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The seismic response of inelastic structures

Bulletin of the New Zealand Society for Earthquake Engineering ◽

10.5459/bnzsee.8.3.192-203 ◽

1975 ◽

Vol 8 (3) ◽

pp. 192-203

Author(s):

R. D. Sharpe ◽

A. J. Carr

Keyword(s):

Seismic Design ◽

Design Method ◽

Plastic Hinge ◽

Degree Of Freedom ◽

Axial Loads ◽

Earthquake Excitation ◽

Inelastic Structures ◽

Dynamic Analyses ◽

Non Linear ◽

Seismic Design Method

A thirteen storey, two bay, reinforced concrete framed structure is subjected to a series of non-linear, dynamic analyses in an attempt to find some correlation between the damaging potential of various digitised earthquakes and their relative strengths which have been computed in a variety of ways. Much of the previous work in this field has been with respect to simple one degree of freedom systems and these do not appear to give any indication of the correlation that could be expected for a non-linear multi-degree of freedom structure. The results show the effects of the different scalings of the various earthquakes and compare these with those obtained for the familiar North-South component of the May 18, 1940 El Centro earthquake. These results highlight the difficulty of trying to relate the use of such a dynamic earthquake analysis to the present pseudo-static code requirements. Further, the results of the analyses show also the great difference between the present assumption of the plastic hinge distributions, used in the ultimate seismic design method, and those observed during the earthquake excitation with the consequences on the lower-floor column axial loads.

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