Savvas Triantafyllou

Research Summary

Composite materials have been extensively used in various engineering applications for years. Applications include, though not limited to, the space, aerospace, automobile and sports industries. The increased attention composites are receiving is due to their excellent mechanical properties such as high strength to weight ratio, high stiffness to weight ratio, high damping, negative Poisson’s ratio and high toughness. In the field of Civil Engineering, composite materials are used either in the form of fiber reinforcing or textile composites into various applications such as retrofitting and strengthening of damaged structures, supporting cables for cable stayed bridges and high strength bridge decks amongst many. Since most composite materials are multiscale in nature, i.e. the scale of the constituents is of lower order than the scale of the resulting material, correct modelling of composites can be a tedious and challenging task. Thus, the required modelling approach has to account for such a level of detailing that spreads through scales of significantly different magnitude. In this project, a novel hysteretic multiscale analysis method is developed for the nonlinear dynamic analysis of composites. Our main objective is the derivation of a robust and computationally efficient formulation which, based on smooth hysteretic modelling, will alleviate the main drawbacks of current multiscale analysis procedures.

Recent Publications

Triantafyllou, S.P., Koumousis, V.K. (2012). “An hysteretic quadrilateral plane stress element”, Archive of Applied Mechanics, 82(10-11), pp. 1675-1687.
Triantafyllou, S.P., Koumousis, V.K. (2012). “ A Bouc-Wen Type Hysteretic Plane Stress Element”, Journal of Engineering Mechanics, 138 (3), pp. 235-246.
Triantafyllou, S.P., Koumousis, V.K. (2011). “An inelastic Timoshenko beam element with axial-shear-flexural interaction”, Computational Mechanics, 48 (6), pp. 713-727.
Triantafyllou, S., Koumousis, V. (2011). “Small and large displacement dynamic analysis of frame structures based on hysteretic beam elements”, Journal of Engineering Mechanics, 138 (1), pp. 36-49.
Panoskaltsis, V.P., Soldatos, D., Triantafyllou, S.P. (2011). “The concept of physical metric in rate-independent generalized plasticity”, Acta Mechanica, 221 (1-2), pp. 49-64.