Engineering

Buckling analysis of thin-walled sections under localised loading using the semi-analytical finite strip method
Thin-walled sections under localised loading may lead to web crippling of the sections. This paper develops the Semi-Analytical Finite Strip Method (SAFSM) for thin-walled sections subject to localised loading to investigate web crippling phenomena. The method is benchmarked against analytical solutions, Finite Element Method (FEM) solutions, as well as Spline Finite Strip Method (SFSM) solutio...


Indentation of sandwiches using a plate model with variable kinematics and fixed degrees of freedom
A recent 3-D, 5 degrees of freedom, variable kinematics zig-zag homogenised model is used for studying sandwich indentation. This model cannot describe in a point-wise sense cells collapse, buckling, debonding failure, plastic yielding, or brittle fracture. Therefore, the progressive folding followed by densification of the core is described through mechanical properties variable with loading, ...
A methodological paradigm for patient-specific multi-scale CFD simulations: from clinical measurements to parameter estimates for individual analysis
A new framework for estimation of lumped (for instance, Windkessel) models parameters from uncertain clinical measurements is presented. The ultimate aim is to perform patient-specific haemodynamic analysis. This framework is based on sensitivity analysistools and the sequential estimation approach of the Unscented Kalman Filter. Sensitivity analysis and parameter estimation are performed in lu...


An investigation of stimulation mechanisms in Enhanced Geothermal Systems
We review ten historical Enhanced Geothermal Systems (EGS) projects and find that typically, during injection: (1) flow from the wellbore is from preexisting fractures, bottomhole pressure exceeds the minimum principal stress, and pressure-limiting behavior occurs. These observations are apparently contradictory because (1) is consistent with shear stimulation, but and suggest propagation of ne...
Nonlinear nonlocal analysis of electrostatic nanoactuators
This study investigates the small scale effect on the nonlinear static and dynamic response of a capacitive nanoactuator subjected to a DC voltage. The nanoactuator is modeled as a Euler–Bernoulli beam cantilever beam and beam clamped at its both ends. The model accounts for residual stresses, initial deflection, the von Kármán nonlinear strains, and the electrostatic forcing. The intermole...


Smart cure cycle for reducing the thermal residual stress of a co-cured E-glass/carbon/epoxy composite structure for a vanadium redox flow battery
The vanadium redox flow battery (VRFB) is considered as one of the most promising energy storage system in the future. It is composed of two endplates and a stack which consists of flow frame (FF), electrode, bipolar plate (BP) and membrane. Because the electrolytes flowing in the stack are sulfuric-acid-based solutions, prevention of leakage is important. The unified structure of the FF and th...
Predicting process-induced distortions in composite manufacturing – A pheno-numerical simulation strategy
Process-induced distortions (PID) of high-performance CFRP structures lead to problems with dimensional control if the distortions are not accounted for by compensating the process tool accordingly. There is a need to predict PID via simulation in industry rather than relying on less reliable information such as past experience or measurements on prototype structures. PID are caused by many phe...

Drying performance analysis of a batch type fluidized bed drying process for corn and unshelled pistachio nut regarding to energetic and exergetic efficiencies
A batch type fluidized bed dryer is designed and constructed in order to investigate drying performance of a batch type fluidized bed drying process of corn and unshelled pistachio nut regarding to energetic and exergetic efficiencies. a series of experiments is carried out for the purpose in the covered range of 100g⩽ mp ⩽300g, 50°C⩽ T ⩽75°C, 6.87m/s⩽ Um ⩽10.86m/s and 47632⩽R...
Simulation and comparison of coils for Hyperpolarized 13C MRS cardiac metabolism studies in pigs
Hyperpolarized 13C Magnetic Resonance represents a promising modality for in vivo spectroscopy since it provides a unique opportunity for the non-invasive assessment of regional cardiac metabolism. Although it represents a powerful tool for the study of the heart physiology in pig models, by permitting metabolic activity mapping, a number of technological problems still limit this technology an...

Prediction of uniaxial compressive strength of rock samples using hybrid particle swarm optimization-based artificial neural networks
Many attempts have been made to predict unconfined compressive strength (UCS) of rocks using back-propagation (BP) artificial neural network (ANN). However, BP-ANN suffers from some disadvantages such as slow rate of learning and getting trapped in local minima. Utilization of particle swarm optimization (PSO) algorithm as a mechanism to improve the performance of ANNs is recently underlined in...
Dynamic lever arm compensation of SINS/GPS integrated system for aerial mapping
Strapdown inertial navigation system (SINS)/global positioning system (GPS) integrated system is an important way of accurate measurement of the mapping sensors for high resolution aerial mapping. However, for keeping the mapping sensor level and appointed direction, inertially stabilized platform (ISP) will be applied and rotate its three gimbals. The lever arm between inertial measurement uni...

Development of measurement frame for detailed measurements of hysteresis cycles of ferromagnetic sheets
This paper describes the electromagnetic design of a new concept of permeameter capable of providing a measurement of the magnetic permeability of sheet strips up to 1.5mm thick. The measurements are performed in DC. A specific feature of the device is its ability to follow the history of the excitation, representing an ideal tool to experimentally characterize hysteresis cycles as a function o...
Effect of boric acid and borax on mechanical, fire and thermal properties of wood flour filled high density polyethylene composites
The aim of this study was to investigate the effect of boron based fire retardants (BbFRs) and fiber loading on mechanical, fire and thermal performances of impregnated spruce wood flour (WF) filled high density polyethylene composites. For this purpose, WF was impregnated with solution of boric acid, borax and their mixture and dried before composite manufacturing. The effect of leaching on th...
T-stress effects on crack kinking in Finite Fracture Mechanics
Finite Fracture Mechanics (FFM) is a coupled criterion, based on the contemporaneous fulfilment of the energy balance and a proper stress requirement. When dealing with mixed-mode brittle fracture of cracked elements, T-stress affects both the conditions. In the present work, the problem is investigated as the mode mixity varies. are provided in terms of the critical stress intensity factors an...
Influence of plastic anisotropy on the limit load of highly under-matched scarf joints with a crack subject to tension
A new semi-analytical plane strain upper bound limit load solution for highly under-matched scarf joints with a crack subject to tension is provided. It is assumed that plastic deformation is fully confined to the soft weld material. a numerical technique is only necessary to evaluate ordinary integrals. Distinguished features of the solution are that (i) plastic anisotropy of the weld material...