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Rostislav Čech, Petr Horyl and Pavel Maršálek

References [1] Čech, R.: Modelling Two-seat Connection to the Frame of Rail Wagon in Terms of Resistance at Impact Test. Ostrava: VŠB - TUO, 2015. Diploma thesis. (in Czech) [2] Masopust, J.: Impact Resistance Test of Welded Two-seat Connection. Fryčovice: BORCAD cz s.r.o., 2014. Technical report. (in Czech) [3] Wu, S. R., Gu, L.: Introduction to the Explicit Finite Element Method for Nonlinear Transient Dynamics, New Jersey, John Wiley & Sons, Inc., 2012. ISBN 9780470572375. [4] Abdollahpoor, A

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Dagmar Ličková, Radim Halama and Zdeněk Poruba

Advisory Committee for Aeronautics, 1943. [4] Halama, R., Markopoulos, A., Šofer, M., Poruba, Z., Matušek, P.: Cyclic plastic properties of class C steel emphasizing on ratcheting: testing and modelling, Strojnícky časopis - Journal of Mechanical Engineering, 2015, 65, No. 1, 21-26. [5] Šofer, M., Fajkoš, R., Halama, R.: Influence of Induction Hardening on Wear Resistance in Case of Rolling Contact, Strojnícky časopis - Journal of Mechanical Engineering, 2016, 66, No.1, 17-26.

Open access

P. Staňák, J. Sládek and V. Sládek

Abstract

In this paper, a meshless local Petrov-Galerkin (MLPG) method is proposed to calculate mechanical and electrical responses of three-dimensional piezoelectric semiconductors under static load. The analyzed solid is discretized by a set of generally distributed nodal points distributed over 3D geometry. Local integral equations (LIEs) are derived from the weak form of governing equations over small local subdomains. The subdomains have a spherical shape with a nodal point located in its centre. A unit step function is used as the test functions in the local weak-form. The moving least-squares (MLS) method is adopted for the approximation of the physical quantities in the LIEs. The proposed MLPG method is verified by using the corresponding results obtained with the finite element method. Numerical examples are presented and discussed for various boundary conditions and loading scenarios to show the performance of the developed MLPG method for analysis piezoelectric semiconducting solids.

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Lyubomyr Poberezhny, Andrij Hrytsanchuk, Igor Okipnyi, Liubov Poberezhna, Andrij Stanetsky and Nadiya Fedchyshyn

REFERENCES [1] 9th Report of the European Gas Pipeline Incident Data Group (period 1970 – 2013 ) https://www.egig.eu/startpagina/$61/$156 [2] Prinz, W. “AC induced corrоsion on cathodically protected pipelines”, UK Corrosion 92, vol.1, pp. 503 – 514, 1992 . [3] Stalder, F. “Pipelines failures”, Materials Science Forum 247, pp. 139 – 146, 1997 . [4] Wakelin, R. G. “AC corrosion – case histories, test procedures, and mitigation“ / R. G. Wakelin, R. A. Gummow, S. M. Segall // Conference: Corrosion 98, San Diego CA, USA, Paper number 565

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Aloizs Lešinskis and Rafał Chatys

knowledge: Signals, signs and symbols, and their distinctions in human performance models,” IEEE Transactions on Systems, Man, and Cybernetics , vol. SMC-13, issue 3, pp. 257–266, 1983. https://doi.org/10.1109/TSMC.1983.6313160 [9] A. M. Gentile, “A working model of skill acquisition with applications to teaching,” Quest , vol. 17, pp. 3–23, 1972. https://doi.org/10.1080/00336297.1972.10519717 [10] A. M. Gentile, “Skill acquisition: Action, movement, and neuromotor processes,” in Movement science: Foundations for physical therapy , 2nd ed., H. Carr and R

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V. Jagadeesh, K. Venkatasubbaiah and A. Lakshumu Naidu

material; it is not a fundamental physical property. It is a measure of how resistant solid matter is to various kinds of permanent changes when a compressive load is applied. Hardness is dependent on ductility, elastic, stiffness, plasticity, strain and so on. According to our analysis, Specimen 3 is having a higher hardness number when compared to the other three specimens at 60 KN (L-Scale) and 100 KN (M-Scale) respectively. Higher the hardness number, lower the temperature to quench it. 4.4 Impact Test Impact strength is the capability of a material to

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Vitālijs Pavelko and Aleksandr Nevskij

identification,” Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences , vol. 359, issue 1778, pp. 131–149, 2001. [9] M. N. Rezai, J. E. Bernard, and J. M. Starkey, “Empirical modal analysis,” The Shock and Vibration Digest , vol. 15, 1983. [10] D. J. Ewins, Modal Testing: Theory, Practice and Application . Baldock: Research Studies Press, UK, 2003. [11] M. W. Halling, I. Muhammad, and K. C. Womack, “Dynamic testing for condition assessment of bridge bents,” Journal of Structural Engineering, ASCE, vol. 127

Open access

Azzeddine Belaziz and Mohamed Mazari

Observation of the formation of microstructural defects by SEM in HDPE [ 7 ] The technical, physical, and chemical specifications of the material studied are summarized in Table 2 . Table 2 Characteristics of HDPE Studied Density 930 kg/m 3 Molecular weight (Mw) 310,000 (g/mole) Crystallinity rate(Xc) 74% Fusion temperature ( T f ) 203°C Fluidity index 0.2−1; 4 g/10 (min) Black carbon 2−2.5% 2.2 Uniaxial tensile tests UT The uniaxial tensile tests UT were carried out on dumbbell

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B. Radha Krishnan and M. Ramesh

, the strength of the composite drops similarly, with decrease in matrix strength at increasing temperature. Composites produced at an industrial scale are used for manufacturing of pistons, cylindrical sleeves, disc sand brake drums. Specimens casting is done through stir casting technique. To find the mechanical properties, specimens are subjected to various tests such as wear, hardness, tensile, radiography and impact tests, and interpretation of CAD/CAM/CAE is very helpful to design, analyse, optimize and interpret the data. Compared to traditional aluminium

Open access

Salima Sadat, Allel Mokaddem, Bendouma Doumi, Mohamed Berber and Ahmed Boutaous

. The Hemp gives fiber properties similar to fiber glass E, which has very high mechanical properties [ 11 ]. Our work is based on the modeling by a genetic approach of the effect of thermal stress on the improvement of mechanical and physical properties of biocomposite material (Hemp-Sisal/Starch). The results of this modeling will be compared with the results of the nonlinear acoustic technique, which was used to locate the interface damage of the materials studied according to our representative elementary volume (see Figure 1 ). Figure 1 The