Dr Yevgen Gorash

Research Fellow

Mechanical and Aerospace Engineering

Personal statement

Yevgen Gorash is Research Fellow in the Weir Advanced Research Centre (WARC) - research group which works on a range of collaborative projects with Weir Group, a leading manufacturer of equipment for mining, oil and gas and power industries.

His area of expertise and responsibly includes FE-analysis of structural integrity using advanced approaches within non-linear Mechanics of Materials. Objects of analysis and design optimisation are usually products produced by various divisions and companies of the Weir Group located all over the world.

Managerial responsibilities within WARC and department include implementation of research and knowledge exchange projects, coordination with industrial partners, support of early career researchers and supervision of PhD students.


Has expertise in:

    • CAD (SolidWorks, PTC Creo) and CAE (ANSYS, ABAQUS, SolidWorks Simulation/Motion/Flow, PTC Creo Simulate)
    • Nonlinear material models (Plasticity and Viscoplasticity, Creep, Fatigue, Hyperelasticity, Unified material models)
    • Finite Element Analysis; Continuum Damage Mechanics; Creep or/and Fatigue residual life assessment; Limit / shakedown and ratchetting analyses


Higher-order and higher floating-point precision numerical approximations of finite strain elasticity moduli
Connolly Stephen John, MacKenzie Donald, Gorash Yevgen
International Journal for Numerical Methods in Engineering (2019)
New formulation of nonlinear kinematic hardening model, part I : a Dirac delta function approach
Okorokov Volodymyr, Gorash Yevgen, MacKenzie Donald, van Rijswick Ralph
International Journal of Plasticity (2019)
New formulation of nonlinear kinematic hardening model, part II : cyclic hardening/softening and ratcheting
Okorokov Volodymyr, Gorash Yevgen, MacKenzie Donald, van Rijswick Ralph
International Journal of Plasticity (2019)
The implications of constitutive model selection in hyperelastic parameter identification
Connolly S, MacKenzie D, Gorash Y
Constitutive Models for Rubber XI 11th European Conference on Constitutive Models for Rubbers (2019)
Isotropic hyperelasticity in principal stretches : explicit elasticity tensors and numerical implementation
Connolly Stephen John, MacKenzie Donald, Gorash Yevgen
Computational Mechanics (2019)
Fatigue and corrosion fatigue life assessment with application to autofrettaged parts
Okorokov Volodymyr, MacKenzie Donald, Gorash Yevgen
ASME 2018 Pressure Vessels and Piping Conference ASME 2018 Pressure Vessels and Piping Conference (2018)

more publications


Teaching assistance with labs on class 16429 – Computer-Aided Engineering Design (CAED) for 4th year students of Mechanical & Aerospace Engineering.

Research interests

Current research interests comprise study and modelling of non-linear material behaviour: Plasticity and Viscoplasticity, Creep, Fatigue, Hyperelasticity, Unified material models. These non-linear material effects are applied to the residual life assessments of engineering structures subject to severe loading conditions using FEA and concepts of Continuum Damage Mechanics.


Doctoral Training Partnership (DTP 2016-2017 University of Strathclyde) | Connolly, Stephen John
MacKenzie, Donald (Principal Investigator) Gorash, Yevgen (Co-investigator) Connolly, Stephen John (Research Co-investigator)
01-Jan-2016 - 01-Jan-2020
Design optimisation of of swellable elastomeric seals using advanced material modelling and FEM simulations with HPC
Gorash, Yevgen (Principal Investigator) Bickley, Alan (Administrator) Gozalo, Francisco (Co-investigator)
Swellable elastomeric seals (packers) have been widely employed in various oil-&-gas and minerals applications. Examples include slimming of well design, zonal isolation, water shut-off, and multi-stage fracturing. Important characteristics of packers required for these applications are how fast the packer can seal the borehole as well as how fast a certain amount of contact pressure can build up. These characteristics, which are generally measured from full-scale packer tests, can be predicted through numerical FEM simulations (using ABAQUS, ANSYS, MSC.Marc etc.) based on material data obtained from basic experiments. The key component of numerical prediction is an availability of advanced material models for swellable elastomers, which would be capable of accurate simulation of packers’ non-linear mechanical behaviour under various downhole conditions. The numerical simulation of packers can be incorporated into optimisation procedure finding an optimal shape of packers with the goals to minimise the time to seal the borehole and maximise the contact pressure between the seal and borehole. Such an optimisation procedure would allow the Weir Group to produce the packer with various designs optimised for different downhole conditions considering the borehole type, i.e., permeable or non-permeable borehole, and downhole uncertainties, i.e., variations of borehole size and borehole temperature. Through this research project, we hope to develop an optimisation procedure based on advanced FEM simulation to provide us an improved design of packers produced by Weir Minerals USA and design recommendations for various downhole conditions.
01-Jan-2016 - 31-Jan-2018
Project 3.7: Investigation and model development of valve leak tightness
Anwar, Ali (Post Grad Student) Gorash, Yevgen (Research Co-investigator) Dempster, William (Principal Investigator) Hamilton, Robert (Academic) Nash, David (Academic)
Pressure Relief Valves (PRV) tend to leak at high pressures. Customers demand a guarantee of leak tightness as a percentage of the set pressure. WEIR competitors can guarantee a higher leak tightness and therefore in certain circumstance we lose orders to our competitors. This work program is intended to understand why PRV's leak and how to reduce or mitigate against the leakage. Improving WEIR design will support the sale of more product. The main purpose of this research is to deliver prediction methods for sealing design with specific emphasis on Weir Group Sarasin-RSBD valve products.
The main objective of this problem is to be able to re-create this leakage issue using computational tools. This will be done using a combination of Finite Element Analysis (FEA) and Computational Fluid Dynamics (CFD). The complexities of this research lie with the deformation and surface effects of the "sealing faces" of the valves at a micron and macro scale including load cycling and creep behaviour analysis. This has to be analysed and reproduced at corresponding pressures and temperatures with compressible or incompressible fluid flow using combined FEA and CFD tools.
23-Jan-2014 - 24-Jan-2017
WeirSPM Pump of the Future PowerFrame
Gorash, Yevgen (Researcher) Comlekci, Tugrul (Principal Investigator) MacKenzie, Donald (Academic)
The design for the POTF is currently being completed by Weir SPM and based on
the discussions on the new design, a set of numerical analysis studies are now proposed for the powerframe of the POTF:
• Kinematic analysis,
• Structural analysis,
• Fatigue analysis,
• Design variations and optimisation analysis.
01-Jan-2014 - 31-Jan-2014
Material modelling and numerical simulation of elastomeric components in pumps and valves
Gorash, Yevgen (Researcher) Comlekci, Tugrul (Principal Investigator) Hamilton, Robert (Academic)
Objectives include:
1. Develop an FEA based methodology and procedure that local Weir Group engineering sites can use to better analyse and predict the behaviour of elastomeric components.
2. Develop an understanding into the behaviour of elastomeric materials in Weir Group products, components and manufacturing issues.
3. Develop a training program on elastomer modelling for Weir Group Engineers.
01-Jan-2013 - 31-Jan-2014
Linear Bore Frac Pump Feasibility Study
Gorash, Yevgen (Researcher) Nicholls, William (Researcher) Manson, David (Administrator) Corney, Jonathan (Principal Investigator) Davies, Bruce (Academic)
Principal objective is to investigate the feasibility of a design proposed as an alternative to the established layout of hydraulic fracturing pumps made by WeirSPM. Known as the "linear bore" pump its design is motivated by a desire to eliminant the highly stressed areas around the intersection of the cross bores found in current design. In addition to its functionality the economics of its manufacturing and maintenance were also considered.
01-Jan-2013 - 30-Jan-2013

more projects


Mechanical and Aerospace Engineering
Technology Innovation Centre

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