Computational Mechanics and Design Group

Department of Civil & Structural Engineering

Prof. Andy Tyas


0114 222 5735

Department of Civil and Structural Engineering
Sir Frederick Mappin Building
Mappin Street,
S1 3JD


Andrew Tyas is a graduate of Loughborough University of Technology, who spent five years working in civil engineering design practice before returning to academia. He received his PhD in for University of Sheffield for a DERA sponsored study of impact dynamics and was appointed Lecturer in Structural Design in 1997.

His teaching interests include structural analysis, design and blast and impact dynamics. He is particularly interested in helping students develop the confidence and maturity to produce suitable design ideas at the initial concept stage. He has been closely involved with the growth of the innovative MEng degree in Structural Engineering and Architecture, accredited by both the IStructE and RIBA, and has developed close links with the School of Architecture at Sheffield, leading to a number of teaching publications. He is currently First and Second Year Undergraduate Tutor.

Dr Tyas is head of the blast and impact research group in the Department of Civil and Structural Engineering, managing the testing laboratory at Harpur Hill, Buxton where research into blast physics and the response of structures to rapid dynamic loading is conducted. He is also a Director of Blastech Ltd, a University spin-out company offering consultancy and commercial testing services to industry in the field of blast and impact loading of structures. Additionally, he collaborates with Matthew Gilbert in the development of computational optimisation-based methods for the design of structures.


PhD (University of Sheffield)


MatLab script for generating LS-DYNA mesh file for spherical expansion of a blast wave

When modelling explosive detonations and blast wave propagation it is important that material movement is aligned with the elements. If a spherical charge is modelled in a rectangular mesh, an advection error is introduced. By modelling the blast wave in a radially symmetric mesh, this problem can be avoided. This...

Research project(s)

Dynamics of micro-trusses

We study the mechanical behaviour of micro lattices (also known as micro-trusses) under a range of loading conditions. Where applicable, we apply homogenisation and continualisation principles to derive higher-order gradient theories with a transparent interpretation of the emerging internal length scales. Under elastic loading conditions, the emergence of stop bands...


(2016). Investigating high strain rate shear in soils using a split Hopkinson pressure bar. In 3rd UK Defence Seminar on the High Strain Rate Properties of Soils and Granular Media.
(2016). Measuring spatial pressure distribution from explosives buried in dry Leighton Buzzard sand. International Journal of Impact Engineering, 96 (2), pp. 89-104. (Full Text).
(2016). Blast Quantification Using Hopkinson Pressure Bars. Journal of Visualized Experiments, pp. 1-11. (Full Text).
(2016). Energy absorption in lattice structures in dynamics: Experiments. International Journal of Impact Engineering, 89 (2), pp. 49-61. (Full Text).
(2016). Effects of strain rate and moisture content on the behaviour of sand under one-dimensional compression. Experimental Mechanics, 56 (9), pp. 1625-1639. (Full Text)., Abstract: The influence of strain rate and moisture content on the behaviour of a quartz sand was assessed using high-pressure quasi-static (0.001 /s) and high-strain-rate (1000 /s) experiments under uniaxial strain. Quasi-static compression to axial stresses of 800 MPa was carried out alongside split...
(2016). Design of a partially confined split Hopkinson pressure bar. In Proceedings of 24th International Symposium on Military Aspects of Blast and Shock.