Experimental Determination of Mechanical Characteristics of Four Types of Stones and their Influence on the Construction Machinery Parts Wear

2015 ◽  
Vol 1100 ◽  
pp. 178-184
Author(s):  
Vukić Lazić ◽  
Dušan Arsić ◽  
Ružica R. Nikolić ◽  
Branislav Hadzima ◽  
Milan Mutavdžić
Keyword(s):  
Wear Resistance ◽  
Experimental Determination ◽  
Mechanical Characteristics ◽  
Building Stones ◽  
Construction Machinery ◽  
Dolomite Marble ◽  
Different Types

In this paper were experimentally determined properties of four different types of stones and stone aggregates and they were compared to each other with respect to their influence on wear of working parts of machines for preparation and deposition of stones on roads. Rocks, the building stones are obtained from, consist of various types of minerals, namely of physically and chemically homogeneous rocks created within the Earths crust. Here are considered four, most important types of building stones: limestone, dolomite marble, calcite-dolomite marble and andesite. They are being exploited from four sites in Serbia, and they are convenient for deposition of certain layers of the carriageway on roads, streets, airports and foundations on railways, as well as for making different kinds of concrete and asphalt. In the paper are presented results of mineralogical-petrographic, physical-mechanical and special investigations. Wear resistance was also checked on certain samples.

Experimental determination of optimum gutter brush parameters and road sweeping criteria for different types of waste

2011 ◽  
Vol 31 (6) ◽  
pp. 1109-1120 ◽  
Author(s):  
Magd M. Abdel-Wahab ◽  
Chong Wang ◽  
Libardo V. Vanegas-Useche ◽  
Graham A. Parker
Keyword(s):  
Experimental Determination ◽  
Different Types

Experimental determination of the thermal neutron flux around two different types of high intensity 252Cf sources

1999 ◽  
Vol 26 (1) ◽  
pp. 83-86 ◽  
Author(s):  
R. Schmidt ◽  
R. L. Maughan ◽  
M. Yudelev ◽  
C. Kota ◽  
S. Wanwilairat
Keyword(s):  
Neutron Flux ◽  
Thermal Neutron ◽  
Experimental Determination ◽  
High Intensity ◽  
Thermal Neutron Flux ◽  
Different Types

scholarly journals Experimental analysis of the mechanical characteristics of launch vehicle parts manufactured by FDM additive technologies

2021 ◽  
Vol 2021 (1) ◽  
pp. 92-100
Author(s):  
I. Derevianko ◽  
◽  
K. Avramov ◽  
B. Uspensky ◽  
A. Salenko ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Stress ◽  
Experimental Determination ◽  
Mechanical Characteristics ◽  
Additive Technologies ◽  
Polymer Materials ◽  
Stress Strain ◽  
Shear Moduli ◽  
Young’S Moduli

Additive manufacturing is very promising for aerospace engineering and aircraft construction. Using these technologies, light structures with preset strength properties can be made. For lack of tables of the mechanical properties of materials made by additive technologies, any calculation must be accompanied by the experimental determination of their mechanical properties. This paper presents an experimental approach to the determination of the mechanical characteristics of parts printed by FDM technologies. Parts manufactured from polymers by FDM technologies are shown to be orthotropic. Therefore, their elastic properties are described by nine constants: three Young’s moduli, three shear moduli, and three Poisson ratios. A cube is printed for the experimental determination of these constants. Six specimens are cut out from the cube. Three specimens are cut parallel to the cube edges, and the other three are cut at an angle of 45° to them. Each such specimen is manufactured in five pieces. This makes it possible to average the tensile stress–strain diagrams obtained for all the components of the stress tensor. The mechanical properties of the material are determined from these diagrams. The three Young’s moduli and the three Poisson ratios are determined from the three specimen types parallel to the cube edges. The three shear moduli are determined from the specimens cut at an angle of 45° to the cube edges. To determine these constants, tensile stress–strain diagrams are obtained experimentally. A technology is presented for manufacturing specimens on a Stratasys FORTUS 900 MC 3D printer. The mechanical properties of two polymer materials (ULTEM 9085 and PLA) are determined and compared. PLA has higher Young’s moduli and shear moduli and lower Poisson ratios than ULTEM 9085.

scholarly journals A Comprehensive Study into the Boltless Connections of Racking Systems

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 276
Author(s):  
Rodoljub Vujanac ◽  
Nenad Miloradović ◽  
Snežana Vulović ◽  
Ana Pavlović
Keyword(s):  
Numerical Model ◽  
Experimental Determination ◽  
Structural Properties ◽  
Test Procedure ◽  
Design Codes ◽  
Joint Properties ◽  
Eurocode 3 ◽  
Different Types ◽  
Comprehensive Study

In practice, structures of pallet racks are characterized by very wide options of beam-to-column connections. The up to date part of the standard Eurocode 3 considers details for the design of connections. However, experimental determination of the joint properties in steel pallet racks is the most reliable process, since it takes into account an inability to develop a general analytical model for the design of these connections. In this paper, a test procedure for the behavior of beam-to-column connections is presented and the results are analyzed according to the procedure defined in the relevant design codes. With aim to avoid expensive experiments to determine structural properties of different types of connections, a polynomial model and a corresponding numerical model were developed to be used for simulating the experiment. After verification, the developed analytical and numerical model can be applied for investigation of various combinations of beam-to-column connections.

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