144 Works

Study of the Distribution of Normal Contact Pressure Between Parts Joined in a Multi-Bolted System under Operational Loads

Rafał GRZEJDA
Modelling and calculations of unsymmetrical multi-bolted connections treated as a system for different bolt models and contact layer models between the joined parts are presented. The modelling refers to preloaded and externally loaded connections. The systemic models of the connection for two substitute models of bolts are shown. Between the joined parts two types of the Winkler model of a contact layer are taken into consideration. Calculations were made for an exemplary unsymmetrical connection. Its...

Theoretical and Numerical Analyses of an Aluminium-Concrete Composite Beam with Channel Shear Connectors

Łukasz POLUS & Maciej SZUMIGAŁA
This paper presents a numerical simulation and a theoretical investigation of an aluminiumconcrete composite (ACC) beam subjected to bending. ACC structures are similar to steel-concrete composite (SCC) structures. However, their girders are made of aluminium instead of steel. The use of ACC structures is limited because of the lack of relevant design rules. Due to this fact the authors suggest applying the theory for SCC structures to ACC structures. In this paper, the methods for...

Numerical Modelling of Post-Ground Subsystem in Road Safety Barrier Crash Tests

Marian KLASZTORNY, Daniel Bronislaw NYCZ, Pawel DZIEWULSKI, Roman GIELETA, Michal STANKIEWICZ & Karol ZIELONKA
A new analytical algorithm for determining the elastoplastic parameters for soft, medium and hard plastic cohesive soils, corresponding to *MAT_005_SOIL_AND_FOAM material model available LS-Dyna FE code, was formulated. The numerical modelling of the post-soil subsystem, applicable in the modelling of road safety barrier crash tests using this material model of the roadside dehydrated ground, was developed. The methodology was presented on the example of a Sigma-100 steel post partly driven into the soil and subjected...

Weakened Zones in Wood – Based Composite Beams and Their Strengthening by CFRP: Experimental, Theoretical, and Numerical Analysis

Krzysztof KULA, Tomasz SOCHA & Arkadiusz DENISIEWICZ
This paper looks at the mechanical behaviour of wood-based beams. Laboratory tests of an I-beam show a considerable decrease of capacity in the weakened zones, e.g., at the connection between two pieces of pine wood used as a flange. We propose strengthening of the zones using fibre composite tapes based on CFRP. This article demonstrates the way for protection of the I-beam with defects in the bottom flange against the loss of load-carrying capacity. The...

A Sliding Mode Controller Design for Thermal Comfort in Buildings

Paweł SKRUCH & Marek DŁUGOSZ
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...

Analytical and Numerical Studies of an Unsymmetrical Sandwich Beam – Bending, Buckling and Free Vibration

Krzysztof MAGNUCKI, Ewa MAGNUCKA-BLANDZI, Jerzy LEWIŃSKI & Szymon MILECKI
The subject of the paper is an unsymmetrical sandwich beam. The thicknesses and mechanical properties of the beam faces are different. Mathematical model of the beam is formulated based on the classical broken-line hypothesis. The equations of motions of the beam is derived on the ground of the Hamilton’s principle. Bending, buckling and free-vibration are studied in detail for exemplary unsymmetrical structure of the beam. The values of deflection, critical force and natural frequency are...

The Impact of Temperature Oscillations and Heat Transfer Conditions in Thick-Walled Elbows and Tubes on the Local Stress-Strain Behaviour During the Fast Start-Up of Power Boilers

Jerzy OKRAJNI & Krzysztof WACŁAWIAK
The paper presents results of tests designed for predicting the behaviour of components subjected to variable temperature and mechanical loading conditions. Elbows and tubes, as examples of components widely used in power plant pipelines, have been examined. This analysis includes a description of model characteristics, the operating parameters of devices under industrial conditions, and the results of computational modelling (FEM).

Asymptotic analysis of the clamped-pinned elastica

P. SINGH & V.G.A. GOSS

A Theory of Undamageable Graphene

George Z. VOYIADJIS & Peter I. KATTAN

Mixed-mode thermal fracture of AISI 304 stainless steel with temperature-dependent material properties

M. RAJABI & N. SOLTANI

Numerical Simulation of Deflection and Stability of the Wooden Transmission Tower of Gliwice Radiostation

Błażej WOJACZEK, Andrzej KATUNIN, Janusz BROL & Katarzyna ADAMCZYK

Screw dislocations in piezoelectric laminates with four or more phases

X. WANG, L. CHEN & P. SCHIAVONE

Nanofluid flow and heat transfer in boundary layers at small nanoparticle volume fraction: Zero nanoparticle flux at solid wall

J.T.C. LIU, M.E. FULLER, K.L. WU, A. CZULAK, A.G. KITHES & C.J. FELTEN

Fåhræus effect revisited

R. HERCZYŃSKI

Cross-diffusion Effects on MHD Mixed Convection over a Stretching Surface in a Porous Medium with Chemical Reaction and Convective Condition

Marimuthu BHUVANESWARI, Sheniyappan ESWARAMOORTHI, Sivanandam SIVASANKARAN & Ahmed Kadhim HUSSEIN

The Role of the Bone Strength on the Cyst Growth in the Mandible

Justyna MIODOWSKA, Jan BIELSKI & Magdalena KROMKA-SZYDEK
Intracystic fluid pressure is discussed as a potentially important factor influencing a bone cyst growth. This process can develop in the course of months. However, the exact mechanism remains speculative. In this paper, we use an established mathematical model to evaluate whether the presence of pressurized fluid in bone cavities may result in cyst growth. A continuous function of bone density rate vs. mechanical stimulus is used. The numerical model of the mandible with the...

Experimental study of the flow around two finite square cylinders

A. SOHANKAR, M. ABBASI, M. NILI-AHMADABADI & MD. MAHBUB ALAM

Bending of Beams with Symmetrically Varying Mechanical Properties Under Generalized Load – Shear effect

Krzysztof MAGNUCKI & Jerzy LEWIŃSKI
The paper is devoted to simply supported beams with symmetrically varying mechanical properties in the depth direction. Generalized load of the beams includes the load types from uniformly distributed to point load (three-point bending). This load is analytically described with the use of a certain function including a dimensionless parameter. The value of the parameter is decisive for the load type. The individual nonlinear “polynomial” hypothesis is applied to deformation of a planar cross section....

Experimental Verification of the Steering Performance of All-Hydraulic Crawler Chassis

Xiaolian LV, Xiaorong LV, Xiaojie SHI & Tingyu WANG

Use of the higher-order plate theory of I. N. Vekua type in problems of dynamics of heterogeneous plane waveguides

O.V. Egorova, L.N. Rabinskiy & S.I. Zhavoronok
The dynamics of elastic plane waveguides is studied on the basis of the extended formulation of the plate theory of Nth order. The plate model is based on the Lagrangian formalism of analytical dynamics combined with the dimensional reduction approach and the biorthogonal expansion of the spatial distribution of the displacement. The boundary conditions shifted from the faces onto the base plane are interpreted as constraints for the variational formulation of two-dimensional plate models. The...

A comparison of deep convolutional neural networks for image-based detection of concrete surface cracks

Marek SŁOŃSKI

Material Spin and Finite-Strain Hypo-Elasticity for Two-Dimensional Orthotropic Media

Ivan Yurievitch ZUBKO

Postprocessing and reliability evaluation of one-dimensional numerical simulation results in mechanical problems

Jan WOJTAS

Registration Year

  • 2018
    24
  • 2019
    114
  • 2020
    6

Resource Types

  • DataPaper
    144

Affiliations

  • Poznań University of Technology
    4
  • Tabor (Poland)
    3
  • Phetchabun Rajabhat University
    2
  • AGH University of Science and Technology
    2
  • Cracow University of Technology
    1
  • Dorodnitsyn Computing Centre
    1
  • China University of Mining and Technology
    1
  • Lublin University of Technology
    1
  • Przemysłowy Instytut Motoryzacji
    1
  • Jan Grodek State Vocational Academy in Sanok
    1
  • Silesian University of Technology
    1
  • Belgorod State Technological University
    1
  • Urmia University
    1
  • Institute of Fundamental Technological Research
    1
  • Rajamangala University of Technology
    1