216 Works

In Memoriam – Professor Erwin Stein


Verification of Application of ANN Modelling in Study of Compressive Behaviour of Aluminium Sponges

Anna M. STRĘK, Marek DUDZIK, Arkadiusz KWIECIEŃ, Krzysztof WAŃCZYK & Barbara LIPOWSKA
This article presents a preliminary neural network analysis of the compressive behaviour of aluminium open-cell sponges and answers the question of whether this phenomenon can be modelled using artificial intelligence. The research consisted of two phases: first – compression experiments, which in turn provided data for the second phase – the artificial neural network (ANN) analysis. A two-argument function was proposed and tested using the gathered experimental data with a two-layer feedforward network. The determination...

Impact of Thermophoretic Transport of Al2O3 Nanoparticles on Viscoelastic Flow of Oil-Based Nanofluid over a Porous Exponentially Stretching Surface with Activation Energy

Christian John ETWIRE, Ibrahim Yakubu SEINI, Musah RABIU & Oluwole Daniel MAKINDE
The influence of thermophoretic transport of Al2O3 nanoparticles on heat and mass transfer in viscoelastic flow of oil-based nanofluid past porous exponentially stretching surface with activation energy has been examined. Similarity technique was employed to transform the governing partial differential equations into a coupled fourth-order ordinary differential equations which were reduced to a system of first-order ordinary differential equations and then solved numerically using the fourth-order Runge-Kutta algorithm with a shooting method. The results for...

A Sliding Mode Controller Design for Thermal Comfort in Buildings

One of the factors determining comfort in buildings is the indoor air temperature of the rooms. A control system, part of the home automation system, should stabilise air temperature to the desired level, despite various disturbances such as the presence of random or occasional sources of heat. Inaccurate models of the dynamics of air temperature changes in buildings prescribe the use of robust control methods, a type of which is the sliding mode controller. This...

Application of the Monte Carlo method with meshless random walk procedure to selected scalar elliptic problems

S. Milewski
The combined stochastic-deterministic approach, which may be applied to the numerical analysis of a wide range of scalar elliptic problems of civil engineering, is presented in this paper. It is based on the well-known Monte Carlo concept with a random walk procedure, in which series of random paths are constructed. Additionally, it incorporates selected features of the meshless finite difference method, especially star selection criteria and a local weighted function approximation. The approach leads to...

Fast GPU simulation of reinforced concrete at the scale of reinforcement ribs by the discrete element method

R. Pacevič, R. Kačianauskas, A. Kačeniauskas, G. Kaklauskas & R. Barauskas
The paper presents the development of the GPU-based discrete element method (DEM) code for simulating damage and fracture of cohesive solids with application to reinforced concrete at the scale of reinforcement ribs. The solid volume of concrete and steel is modelled by bonded spherical particles. Very fine discretization, containing more than million particles, is applied to describe the 3D reinforcement bar geometry at the scale of ribs and to investigate cracking behaviour of concrete near...


K. Wiśniewski
This issue of “Archives of Mechanics” contains a selection of papers presented at the 41st Solid Mechanics Conference (SolMech 2018) held in Warsaw, August 27–31, 2018. The e-book of conference abstracts (with the ISBN) is available at the conference website: http://solmech2018.ippt.pan.pl/.

Inverse estimation of model parameters for newborn brain cooling process simulations

Dominika BANDOŁA, Ziemowit OSTROWSKI, Marek ROJCZYK, Wojciech WALAS, Zenon HALABA & Andrzej J. NOWAK

Reach of an inclined cantilever with a tip load

P. Singh & V.G.A. Goss
We investigate the problem of determining the reach of an inclined cantilever for a given point load suspended from its tip. Two situations are considered. Firstly, we find the maximum reach of the cantilever by varying its angle of inclination. Secondly, we find the reach of the cantilever subject to the condition that its tip is at some specified height, above or below, the level of the clamped end. In the second case, the reach...

Acoustic propagation in inhomogeneous fluids: regularization via the introduction of fine particles

P.M. Jordan
It is shown, using analytical methodologies, that the velocity field blow-up suffered by vertically ascending acoustic waves in an isothermal atmosphere can be eliminated via the introduction of fine particles. Assuming the inhomogeneous generalization of the particle-laden flow model known as the (linearized) Marble–Thompson model-1, it is established that bounded, exponentially decreasing, shock amplitudes can be obtained provided the mass fraction of particles exceeds a critical value, for which an exact expression is derived. Lastly,...

Lightweighting of Wishbone Finite Element Analysis

Shuxian WANG, Perk Lin CHONG & David HUGHES
This paper focuses on lightweighting of wishbone structure for ordinary 5-seated commercial vehicle. Typically, the wishbone structure is made of high carbon steel and the aim is to investigate if the composite materials, such as E-Glass/Epoxy, Carbon/Epoxy and Boron/Epoxy, can achieve the lightweighting purpose without compromising material strength. The study is carried out through finite element package (Siemen NX) with the consideration of three different loading conditions, namely, lateral braking force, vertical and longitudinal braking...

Inverse Kinematics of a Spatial Mechanism using Multibond Graph

Aman Kumar MAINI & Anand VAZ

Thermodynamics Analysis of an MHD Casson Fluid Flow Through a Rotating Permeable Channel with Slip and Hall Effects

Adetayo Samuel EEGUNJOBI & Oluwole Daniel MAKINDE
In this paper, the inherent irreversibility in a Casson fluid flow through a rotating permeable microchannel with wall slip and Hall current is investigated. It is assumed that the lower wall is subjected to the velocity slip and fluid injection while the fluid suction occurs at the upper wall. The nonlinear governing equations of momentum and energy balance are obtained, analyzed and solved numerically using the shooting technique together with the Runge-Kutta-Fehlberg integration method. Pertinent...

Numerical Analysis of the Transient and Non-Isothermal Channel Flow of a Third-Grade Fluid with Convective Cooling

Tiri CHINYOKA & Oluwole Daniel MAKINDE
We investigate the unsteady, non-isothermal, pressure driven channel flow of a third grade liquid subject to exothermic reactions. We assume temperature dependent fluid viscosity and also that the flow is subjected to convective cooling at the channel walls. The exothermic reactions are modelled via Arrhenius kinetics and the convective heat exchange with the ambient at the channel walls follows Newton’s law of cooling. The time-dependent, coupled, and nonlinear partial differential equations governing the flow and...

Analysis of multiple bifurcation behaviour for periodic structures

I. Ario & M. Nakazawa
The classification of simple singularities in the post-buckling analysis of truss structures is well-known for elastic stability. To focus on multiple singularities including a hilltop bifurcation point (h-BP) and its bifurcation paths, we reviewed the multiple bifurcation analysis of multi-folding microstructure (MFM) models with periodic symmetry. Because the Jacobian at the h-BP of the MFM involves multiple 0-eigenvalues, it is challenging to analyse the bifurcation paths from the h-BP accurately. In this study, we investigated...

Microstructural Investigation and Wear Characteristics of Al-Si-Ti Cast Alloys

Akeel Dhahir SUBHI, Ali Abbar KHLEIF & Qasim Saad ABDUL-WAHID
Hypoeutectic Al-7Si alloys containing various titanium proportions (0.8–1.6%) were produced and analyzed in this work. The wear characteristics of Al-Si alloys were studied under the conditions of dry sliding at various applied loads. Optical microscope (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to depict the microstructure, worn surface and phases, respectively. Phases of α-Al, eutectic and Ti9Al23 were recognized in the Al-Si-Ti alloys matrix. Considerable coarsening took place in α-Al and...

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  • Poznań University of Technology
  • Tabor (Poland)
  • Stellenbosch University
  • Phetchabun Rajabhat University
  • AGH University of Science and Technology
  • Cracow University of Technology
  • Vellore Institute of Technology University
  • Silesian University of Technology
  • University of Architecture, Civil Engineering and Geodesy
  • An-Najah National University