Temat: P46 - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Mechanical Properties and Fracture Analysis of Clinched Joints in Titanium Sheet Materials
Autorzy:: He, X.
Lei, L.
Zhang, Y.
Xing, B.
Powiązania:: https://bibliotekanauki.pl/articles/1030360.pdf
Data publikacji:: 2017-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 46.70.-p
Opis:: Mechanical fastening techniques are used extensively in different industry fields for joining various materials in the assembly of components and structures. The use of mechanical clinching is of interest to different industries such as aerospace, automotive, packaging and domestic appliance. This, together with increasing use of light-weight materials, has produced a significant increase in the use of mechanical clinching in light-weight structures in recent years. This paper deals with the mechanical properties and fracture analysis of extensible die clinched joints in the dissimilar metal sheets combinations of titanium sheet material and aluminum sheet material. Tensile-shear tests were carried out to characterize the mechanical properties of different clinched joints made of the dissimilar metal sheets combinations. The normal hypothesis tests were performed to examine the rationality of the test data. The load-bearing capacity and failure modes of different titanium sheets clinched joints were studied. Results showed that most titanium sheets clinched joints failed in the neck fracture mode. Results also showed that the load-bearing capacity of clinch joints with titanium as upper sheets is higher than that of the clinched joints with titanium as lower sheets.
Źródło:: Acta Physica Polonica A; 2017, 131, 1; 16-19
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Mechanical behavior of clinched sheet material joints and strength design procedure
Autorzy:: He, X.
Gao, A.
Yang, H.
Xing, B.
Powiązania:: https://bibliotekanauki.pl/articles/1155166.pdf
Data publikacji:: 2016-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 46.70.-p
Opis:: Clinching is an effective joining technique for lightweight sheet materials that are difficult or impossible to weld. A theoretical model for clinched joints in metal sheets was established and a design method for improving joint strength by selecting different clinching tools was proposed. The analytic model is defined as a function of the neck-thickness and the undercut, which are the key parameters of joint geometry. Based on the analytic model, the design method of clinched joint strength that can satisfy required strength was proposed. Clinching experiments were conducted with 2.00 mm thick aluminium alloy 5052 sheets. Various conditions were used during the clinching process to validate the joint strength model. Tensile-shear strength of clinched joints was measured by a servo-hydraulic testing machine. The calculated joint strength was in good agreement with the experimental results.
Źródło:: Acta Physica Polonica A; 2016, 129, 4; 698-700
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Strength and Fracture Analysis of Single-Lap Self-Pierce Riveted Joints
Autorzy:: He, X.
Lu, Y.
Liu, F.
Xing, B.
Zeng, K.
Powiązania:: https://bibliotekanauki.pl/articles/1192386.pdf
Data publikacji:: 2015-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 46.70.-p
Opis:: Due to the increased use of lightweight sheet materials, there has been a significant increase in the use of self-pierce riveting. This paper deals with the strength and fracture mechanism of single-lap self-pierce riveted joints. The online window technique was introduced in the single-lap self-pierce riveting processes for evaluating the quality of joints. Signals obtained from sensors were amplified and transferred to the data acquisition system which measures, processes and saves the signals. Monotonic tensile tests were carried out to measure the ultimate tensile strengths for the single-lap self-pierce riveted joints. For investigating the fracture mechanism of the single-lap self-pierce riveted joints, the electrolytic polishing and anode film coating were used for dealing with the cross-section. The differential interference contrast method was used for observing the micro-structure of the cross-section of the joints. The distribution of the hardness in the cross-section of the single-lap self-pierce riveted joints was also studied. The normal hypothesis tests were performed to examine the rationality of the test data.
Źródło:: Acta Physica Polonica A; 2015, 127, 4; 1424-1426
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Etyczne i ekonomiczne aspekty państwa dobrobytu
Ethical and Economic Aspects of the Welfare State
Autorzy:: Przybyciński, Tomasz
Powiązania:: https://bibliotekanauki.pl/articles/965180.pdf
Data publikacji:: 2016-09-15
Wydawca:: Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:: ethics
welfare state
subsidiary principle
A13
I38
P46
Opis:: A concept of the welfare state is based on the principles of equitable distribution of wealth and equality of opportunity. The state is responsible for the protection and promotion of the economic and social well-being of its citizens. Progressive taxation reduces the income gap between the rich and poor. However, the efforts to put principles of the welfare state into practice produced still unsatisfactory results. It was closely connected with violating the subsidiary principle and eroding the work ethics. That is just why the welfare state failed from the ethical and economic point of view.
Źródło:: Annales. Etyka w Życiu Gospodarczym; 2016, 19, 3
1899-2226
2353-4869
Pojawia się w:: Annales. Etyka w Życiu Gospodarczym
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Structural Stabilities and Elastic Constants of EuX (X = O, S, Se, and Te) Compounds at High Pressure
Autorzy:: Kong, B.
Zhou, Z.
Sun, X.
Zhang, L.
Ling-Hu, R.
Powiązania:: https://bibliotekanauki.pl/articles/1400144.pdf
Data publikacji:: 2013-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.66.-f
46.70.-p
61.43.-j
75.50.-y
Opis:: The structural stabilities, elastic properties and charge transfers of EuX (X = O, S, Se, Te) compounds as a function of pressure are investigated extensively using first-principles calculations. The ground-state parameters, such as lattice constants, bulk modulus are predicted and compared with the available data, our results are satisfactory. The calculated phase transition pressures from the NaCl-type (B1) structure to the CsCl-type (B2) structure for EuX (X = O, S, Se, Te) also accord with the experiments. Particularly, the elastic constants of EuX (X = O, S, Se, Te) under zero pressure and high pressure are simulated appropriately for the first time via density functional theory. The softening behaviors of the elastic shear modulus $C_{44}$ under pressure for the B1 phase of EuX (X = O, S, Se, Te) are captured, which should be responsible for the pressure-induced structural phase transition in the EuX system. It is also suggested that the softening behavior might be induced partly by the p → d and f → d electron transfers of Eu atom under pressure. In addition, the aggregate elastic modulus (B, G, E), Poisson's ratio (σ), Debye temperature $\Theta p_{D}$ are also successfully obtained for both B1 and B2 phases of EuX.
Źródło:: Acta Physica Polonica A; 2013, 123, 4; 720-727
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Study of dislocation substructures in high-Mn steels after dynamic deformation tests
Autorzy:: Śmiglewicz, A.
Moćko, W.
Rodak, K.
Bednarczyk, I.
Jabłońska, M.
Powiązania:: https://bibliotekanauki.pl/articles/1058094.pdf
Data publikacji:: 2016-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 81.05.Bx
81.40.-z
68.37.Ma
46.70.-p
Opis:: The article presents the dynamic mechanical properties of two types of high manganese austenitic TWIP steels. The investigations were carried out for the wide range of strain rates from 10¯² s¯¹ up to 4×10³ s¯¹ using servo-hydraulic testing machine and split Hopkinson bar for the quasi-static and dynamic loading regime, respectively. The mechanical properties at different strain rates like yield strength and true stress were calculated out on the base of the results of impact tests. In the next step, the microstructure of the analyzed steels after different deformation rates were observed by scanning transmission electron microscopy technique in order to disclose a dislocation structures and mainly the TWIP effect. In the studies observed that with the strain rate increasing yield strength as well as true stress for 0.3 true strain increasing in both steels. The microstructure observations reveal the influence of strain rate on the structure evolution for analyzed steels.
Źródło:: Acta Physica Polonica A; 2016, 130, 4; 942-945
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: STM/STS Studies of Self-Organized Growth of Iron Silicide Nanocrystals on Vicinal Si(111) Surface
Autorzy:: Wawro, A.
Suto, S.
Czajka, R.
Kasuya, A.
Powiązania:: https://bibliotekanauki.pl/articles/2036897.pdf
Data publikacji:: 2003
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.46.+w
68.35.-p
68.37.Ef
81.10.Jt
Opis:: The evolution of iron silicide structure grown by solid state epitaxy on Si(111) vicinal surface was investigated by scanning tunnelling microscopy. The reactions, which occur on the surface, are compared for two various Fe coverages: 0.33 and 2 monolayers. The annealing at 250˚C does not enable substantial recovery of the surface ordering, deteriorated by Fe deposition at room temperature. The onset of 2×2 surface reconstruction is observed upon annealing at 400˚C. A three-dimensional growth tendency of iron silicide crystallites on a bare Si(111) 7×7 surface was found at 700˚C. In the case of 2 monolayer coverage crystallites nucleate along the edges of substrate terraces forming a regular array of nanometer size dots. Basing on atomically resolved spectroscopic effects and statistical considerations, structure of iron silicide nanocrystallites as well as Schottky-like character of the barrier at the interface between metallic crystallite and semiconducting substrate is deduced.
Źródło:: Acta Physica Polonica A; 2003, 104, 3-4; 303-319
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Wear Properties of Gabbro Based Glass and Glass-Ceramic Materials
Autorzy:: Bayrak, G.
Powiązania:: https://bibliotekanauki.pl/articles/1293752.pdf
Data publikacji:: 2014-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 46.55.+d
64.70.P-
61.43.Fs
61.05.cp
Opis:: Glass-ceramic materials were developed from gabbro including MgO and $Al_2O_3$ additives. Heat treatments for phase transformation from glassy matrix to glass-ceramic were carried out at 1000C for 3 h. X-ray diffraction studies conducted on the glass-ceramic samples revealed that the phases formed in the glass-ceramics were cordierite, anorthite, diopsitic augite, forsterite and andesine. Glass and glass-ceramic materials were tested for wear properties against a harder alumina counterface using by a ball-on-disc tribometer at dry sliding condition. Wear tests were realized under the loads of 2.5, 5, and 7.5 N and at the sliding speeds of 0.1, 0.2, and 0.3 m/s. Wear rate of the glass and glass-ceramics ranged from 7.324 × $10^{-7}$ and 2.150 × $10^{-3}$-9.971 × $10^{-7}$ and 4.982 × $10^{-5} mm^3$/m, respectively. It was shown that the crystallization treatment caused the decrease of wear rate.
Źródło:: Acta Physica Polonica A; 2014, 125, 2; 615-617
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: The Influence of Drivers Working Environment οn Thermical Changes of Their Organism
Autorzy:: Damijan, Z.
Uhryński, A.
Powiązania:: https://bibliotekanauki.pl/articles/1537402.pdf
Data publikacji:: 2010-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 08.89.40.-a
46.40.-f
87.19.R-
43.80.-n
43.80.+p
Opis:: The work presents the research on the influence of driver's working environment on thermical changes in their organism. The experiment was conducted between 24 and 31 March 2008 in the tram depot of Public Transport Agency in Tychy. Thermo-visual photos were conducted twice a day - before starting work and after finishing it during six following days. The group consisted of 14 drivers aged 24-49 driving city buses (the make: Solaris Urbino 18). The results were analyzed concerning statistics using Statistica. For the sake of the analysis the significance level was p = 0.05, the non-parametric Wilcoxon test or parametric T-test were used for two groups of dependent variables. The research and analysis show that driver's working environment has valid influence on thermical changes in their organism.
Źródło:: Acta Physica Polonica A; 2010, 118, 1; 35-40
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: New Multimode Sonotrodes Models Designed for Rotary Ultrasonic Welding Systems
Autorzy:: Kogut, P.
Milewski, A.
Kardyś, W.
Kluk, P.
Gawryś, P.
Powiązania:: https://bibliotekanauki.pl/articles/1399374.pdf
Data publikacji:: 2013-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 43.40.-r
43.40.+s
43.35.+d
43.38.+n
43.38.-p
46.40.-f
Opis:: The paper presents methods of designing sonotrodes, working in varied mechanical vibration modes in high power application regime such as rotary ultrasonic welding systems. The aim of the sonotrode design process is to optimize its shape to achieve the best energy efficiency for a given welding process. Sonotrode geometry influences the power transferred to the welded element because it determines the vibration amplitude distribution in the sonotrode. The most popular applications use sonotrodes designed for axial vibration. Conducted research have shown that the optimal displacement and strain distribution is achieved for sonotrodes working in various vibration modes such as axial, transverse, radial or their compositions. In the paper examples of multimode sonotrode models for various rotary ultrasonic welding technologies have been presented.
Źródło:: Acta Physica Polonica A; 2013, 124, 3; 474-478
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Measurement System for Parameter Estimation and Diagnostic of Ultrasonic Transducers
Autorzy:: Kluk, P.
Milewski, A.
Kardyś, W.
Kogut, P.
Michalski, P.
Powiązania:: https://bibliotekanauki.pl/articles/1399367.pdf
Data publikacji:: 2013-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 43.35.-c
43.35.+d
43.38.+n
43.38.-p
84.37.+q
07.10.-h
46.40.-f
07.20.Dt
Opis:: The paper presents an architecture and design of measurement system and methods for parameter estimation and diagnostic of ultrasonic transducers used in ultrasonic welding and cutting systems manufactured by Tele and Radio Research Institute. The key element of the ultrasonic welding and cutting system is a high power ultrasonic transducer implemented as a sandwich transducer consisting of a stack of piezoelectric ceramic rings mounted between two masses. High quality welding and cutting demand predetermined frequency characteristic of transducer impedance. Also important are: high energy efficiency, high coupling coefficient, low dielectric loss, and the optimal radiation pattern. In order to manufacture high quality and long-life transducers the piezoelectric rings must be selected and the sandwich transducers diagnosed on the basis of their measured parameters. Presented measurement system takes advantage of the virtual instrument technique in the NI LabVIEW environment. It uses Agilent U2761A Function Generator, U2531A Data Acquisition Unit, and the linear amplifier to measure impedance frequency characteristic in the frequency range of 10 kHz to 100 kHz. Moreover, the system can measure the vibration amplitude in the range of 1 μm up to 100 μm, using an optical sensor, and the temperature of the transducer using a pyrometer sensor.
Źródło:: Acta Physica Polonica A; 2013, 124, 3; 468-470
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki