129 Works

Experimental determination and numerical simulation of material and damage behaviour of 3D printed polyamide 12 under quasi-static loading

D. Schob, R. Roszak, I. Sagradov, H. Sparr, M. Ziegenhorn, A. Kupsch, F. Léonard, Müller & G. Bruno
In order to characterise the material and damage behaviour of additively manufactured polyamide 12 (PA12) under quasi-static load and to implement it in a numerical model, experiments under quasi-static load as well as microstructural investigations were carried out. Selective laser sintering (SLS) was used as the manufacturing process. For the classification of the material behaviour, quasi-static cyclic tests with holding times as well as tensile tests were performed. X-ray refraction and computed tomography (CT) were...

Estimation of the ischemic brain temperature with the particle filter method

Felipe S. NUNES, Helcio R.B. ORLANDE & Andrzej J. NOWAK

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

Marek SŁOŃSKI

Experimental and Theoretical Study on Screwed Connections in Cold-Formed Steel Structure

Rattanasak HONGTHONG, Apai BENCHAPHONG, Sutera BENCHANUKROM & Nirut KONKONG
This research aims to study the fastening rotation behavior of cold-formed steel screw connections by experimental testing and analytical modelling. Both the experimental test and finite element results showed the failure modes of tilting and bearing failure. The rotation failure mode of the screw connection was studied by an analytical method using a spring model with screw-plate stiffness which included the bending and shear stiffness of the screw and the bearing stiffness of the screw...

Heuristics applying stochastic information as tools for thermoacoustic standing-wave engine optimization

Iwona NOWAK

Numerical simulation of random fields using correlated random vector and the Karhunen-Loève expansion

Mariusz POŃSKI & Iwona POKORSKA

Development of Non-Contact Fatigue Crack Propagation Monitoring Method Using Air-Coupled Acoustic Emission System

Takuma MATSUO & Daisuke HATANAKA
A monitoring system for fatigue crack propagation was developed using a non-contact acoustic emission (AE) monitoring system. The AE signals generated during the plane bending fatigue test were first monitored. The AE generation rate increased after approximately 0.5 of the fatigue life ratio. The maximum amplitude of the AE signals increased with a tendency similar to that of the crack propagation. The sensor sensitivities for the flat and arced surfaces were then compared. The sensitivity...

The Effect of Strength Differential on Material Effort and Lifetime of Steam Turbine Rotors Under Thermo-Mechanical Load

Mariusz BANASZKIEWICZ, Waldemar DUDDA & Janusz BADUR
The paper presents the results of experimental tests and numerical simulations related with the strength differential effect. Tensile and compression tests on 2CrMoV low-alloy steel are performed to evaluate the magnitude of the yield stress difference in tension and compression. The strength differential parameter is then used in the formula for equivalent stress proposed by Burzynski. The material effort calculated using Burzynski and Huber-Mises-Hencky hypotheses was compared for different start-stop cycles. Analytical notch stress-strain correction...

Potential method in the theory of thermoelasticity for materials with triple voids

M. SVANADZE

Performance Evaluation and Frequency Response Analysis of a Two Stage Two Spool Electrohydraulic Servovalve with a Linearized Model

Nitesh MONDAL & Biswanath DATTA
This article focuses on the performance study and frequency response analysis with the state space model of a linearized two stage two spool non-conventional electrohydraulic servovalve from a set of nonlinear state equations. The performance of this valve depends on many valve geometries and fluid parameters. This non-conventional electrohydraulic servovalve is controlled by a pressure controlled pilot, which generates a differential pressure between the upper and lower chambers of two spools. This differential pressure acts...

Research on Influence of TiSi(N) Reflective Coating Thermal Resistance on Energy Absorption of Fireproof Textile Coupled with Auxetic Fabric

Danuta MIEDZIŃSKA, Michał STANKIEWICZ, Roman GIELETA & Konstanty MARSZAŁEK
The research presented in the paper deals with the improvement of firemen protective clothing. The proposed modification of the special textile PROTON is based on the application of TiSi(N) nanocomposite reflective layer, which improves the thermal resistance of the coated material. The second improvement deals with the implementation of auxetic textile into the protective clothing structure. Such material is characterized with the very good blast wave resistance. In the paper both phenomena were studied. The...

Second-order two-temperature model of heat transfer processes in a thin metal film subjected to an ultrashort laser pulse

E. Majchrzak & J. Dziatkiewicz
Thermal processes in domain of thin metal film subjected to an ultrashort laser pulse are considered. A mathematical description of the process discussed is based on the system of four equations. Two of them describe the electrons and lattice temperature, while third and fourth equations represent the generalized Fourier law, it means the dependencies between the electrons (lattice) heat flux and the electrons (lattice) temperature gradient. In the generalized Fourier law the heat fluxes are...

Vibrations of a Double-Beam System with Intermediate Elastic Restraints Due to a Moving Force

Filip ZAKĘŚ & Paweł ŚNIADY
In this paper, we investigate the problem of the dynamic behaviour of a double-beam system with intermediate elastic restraints subjected to a moving point force. Problem is solved by replacing this type of structure with two single-span beams loaded with a given moving force and redundant forces representing reactions in the intermediate restraints. Redundant forces are obtained by solving Volterra integral equations of the second order which are compatibility equations corresponding to each redundant. Solutions...

Effect of material composition on bending analysis of FG plates via a two-variable refined hyperbolic theory

M. BOUAZZA, A.M. ZENKOUR & N. BENSEDDIQ

Elastic properties of a unidirectional composite reinforced with hexagonal array of fibers

T. CZAPLINSKI, P. DRYGAŚ, S. GLUZMAN, V. MITYUSHEV, W. NAWALANIEC & G. ZIETEK

A circular inclusion with inhomogeneous sliding imperfec tinterface in harmonic materials

D.R. MCARTHUR & L.J. SUDAK

Euler–Bernoulli type beam theory for elastic bodies with nonlinear response in the small strain range

A. JANEČKA, V. PRŮŠA & K.R. RAJAGOPAL

Acceleration feature points of unsteady shear flows

J. KASTEN, J. REININGHAUS, I. HOTZ, H.-C. HEGE, B. R. NOACK, G. DAVILLER & M. MORZYŃSKI

Random composite: stirred or shaken?

S. GLUZMAN, V. MITYUSHEV, W. NAWALANIEC & G. SOKAL

Nano-inclusion with uniform internal strain induced by a screw dislocation

M. DAI, P. SCHIAVONE & C.-F. GAO

Simulation of dynamic phenomena in a high pressure variable displacement axial piston hydraulic pump

Tomasz ZAWISTOWSKI & Michał KLEIBER

Virtual Additive Manufacturing Based on Semicrystalline Polymer Polyetheretherketone (PEEK)

Paweł BAJERSKI, Ryszard B. PECHERSKI & Damian CHUDY
Virtual additive manufacturing (AM) is one of the new directions of research that is necessary to improve AM technology. Abaqus/SIMULIA software allows to simulate the whole process using user subroutines to expand solver capabilities. Two of the most important subroutines are UepActivationVol and UMATHT. The UepActivationVol is related to an activation of elements in accordance with the defined path of the process. The second one the UMATHT is used to implement and combine thermal and...

Registration Year

  • 2019
    129

Resource Types

  • Data Paper
    129

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