Investigation of Physical and Mechanical Properties of Selected Rock Types in Kogi State Using Hardness Tests

2015 ◽  
Vol 4 (0) ◽  
pp. 37 ◽  
Author(s):  
Godwin Anikoh ◽  
Patrick Adeniyi Adesida ◽  
Oluwasanmi Cosmas Afolabi
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Rock Types ◽  
Hardness Tests

scholarly journals The Effect of Heat Shocks and Freezing–Thawing Cycles on the Mechanical Properties of Natural Building Stones

2021 ◽  
Vol 8 ◽  
pp. 76-100
Author(s):  
Mohammad-Taghi Hamzaban ◽  
Ismail Sedat Büyüksağiş ◽  
Ali Touranchehzadeh ◽  
Milad Manafi
Keyword(s):  
Mechanical Properties ◽  
Mechanical Performance ◽  
Linear Regression Analysis ◽  
Physical And Mechanical Properties ◽  
P Wave ◽  
Multivariate Linear Regression Analysis ◽  
Mining Operations ◽  
Rock Samples ◽  
Rock Types ◽  
Natural Building

The damage to rock masses due to the action of freezing is one of the most important factors in the development of landscapes, the performance of civil structures, and the efficiency of mining operations. In this research paper, the effect has been studied on the physical and mechanical performance of seven different natural building rock samples. The testing program included an experimental study on both dry and saturated intact rock samples and therefore, the effect of saturation on the extent of damage on the tested samples has been discussed as well. Based on the obtained results, freezing–thawing cycles increase the porosity of rock samples and decrease the values of P-wave velocity, uniaxial compressive strength, elastic modulus, and Brazilian tensile strength. Moreover, the behavior of different rock types differs to some extent when exposed to weathering cycles under dry and saturated conditions. A multivariate linear regression analysis was used to predict the changes in the physical and mechanical properties of different rock types. It was been shown that with some cautions, the obtained correlations can be generalized for practical cases and can be used to predict the change of rock physical and mechanical properties during the lifetime of rock engineering projects. Such predictions have a high potential of applicability in quite different types of natural stone applications in cold climates. From the stability of structures created in rock materials to the durability of structures created by different natural stones.

scholarly journals Design and Fabrication of Thermoplastic Moulds for Manufacturing CFRP Composite Impeller Blades

2020 ◽  
Vol 57 (1) ◽  
pp. 290-298
Author(s):  
Sorin Draghici ◽  
Ionut Sebastian Vintila ◽  
Radu Mihalache ◽  
Horia Alexandru Petrescu ◽  
Catalin Stelian Tuta ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Surface Quality ◽  
Mechanical Characterization ◽  
Physical And Mechanical Properties ◽  
Full Scale ◽  
Composite Processing ◽  
Good Surface ◽  
Hardness Tests ◽  
Cfrp Composite ◽  
3D Printed

The main objective of this study was to investigate thermoplastic materials design and fabrication processes for manufacturing composite impeller blades. Polyurethane (Necuron) and ABS (3D printed) thermoplastics were chosen due to their good mechanical properties, tooling applications, easy manufacturing and lifetime. For both thermoplastics, workability and hardness tests were performed, as well as microstructural and mechanical characterization evaluating their physical and mechanical properties. A 1:2.5 scale mould was designed and milled from Necuron N651 and N1001 and used for manufacturing of 1:2.5 scale composite impeller blades. Also, 1:1 scale ABS mould components were 3D printed and used to manufacture full scale composite impeller blades. All composite impeller presented good surface quality and tolerances with respect to CAD design, thus answering to requirements related to composite processing

scholarly journals Investigation of dependences of physical and mechanical properties of serpentinites of the Dzhetygarinsky deposit

2020 ◽  
pp. 29-37
Author(s):  
Koptiakov Dmitrii ◽  
◽  
Kharisov Timur F. ◽  
Kharisov Timur ◽  
◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Laboratory Tests ◽  
Statistical Data ◽  
Research Result ◽  
Physical And Mechanical Properties ◽  
Tensile Tests ◽  
Rock Types ◽  
Rock Stability ◽  
Direct Measurements ◽  
Subsequent Determination

Introduction. The study of the rock stability properties and parameters is an integral part of ensuring safe subsurface use in the process of human impact on the rock mass. In order to understand the spatial variability of serpentinite rocks properties and parameters, research has been carried out, including laboratory tests with subsequent determination and analysis of laws governing the changes in their physical and mechanical properties. Research methodology. In this study, physical and mechanical properties of rocks of the Zhitikarinsky (Dzhetygarisnky) quarry were determined and analysed. The research methods included laboratory uniaxial compression-tensile tests, direct measurements of dry unit weigh, and the statistical analysis of the data obtained. Research result. According to the results of tests and statistical data processing, the values of physical and mechanical properties were obtained for ten rock types collected at the marginal area of the Zhitikarinsky quarry. The graphs show an analysis of laws governing the changes. With an increase in the degree of serpentinization, the values of strength characteristics decrease significantly. Correlations of physical and mechanical properties of serpentinite rocks of the Zhitikarinsky deposit are established.

PEMANFAATAN KAYU AKASIA MANGIUM (Acacia mangium Willd) UNTUK MEBEL

2012 ◽  
Vol 4 (1) ◽  
pp. 1
Author(s):  
Djoko Purwanto
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Physical Properties ◽  
Treatment Process ◽  
Acacia Mangium ◽  
Physical And Mechanical Properties ◽  
Wood Fibers ◽  
Test Parameters ◽  
Mechanical And Physical Properties ◽  
Scale Scores

Timber Acacia mangium (Acacia mangium, Willd) for Furniture. The study aims to determine the mechanical and physical properties and the decorative value (color and fiber) wood of acacia mangium with using finishing materials. This type of finishing material used is ultran lasur natural dof ,ultran lasur classic teak, aqua politur clear dof, aqua politur akasia dan aqua politur cherry. After finishing the wood is stored for 3 months. Test parameters were observed, namely, physical and mechanical properties of wood, adhesion of finishing materials, color and appearance of the fiber, and timber dimensions expansion. The results showed that the mechanical physical properties of acacia wood qualified SNI. 01-0608-89 about the physical and mechanical properties of wood for furniture, air dry the moisture content from 13.78 to 14.89%, flexural strength from 509.25 to 680.50 kg/cm2, and compressive strength parallel to fiber 342.1 - 412.9 kg/cm2. Finishing the treatment process using five types of finishing materials can increase the decorative value (color and fiber) wood. Before finishing the process of acacia mangium wood has the appearance of colors and fibers and less attractive (scale scores 2-3), after finishing acacia wood fibers have the appearance of colors and interesting and very interesting (scale 4-5).Keywords: mangium wood, mechanical properties, decorative value, finishing, furniture.

Physical and Mechanical Properties of Tenun Pahang Fabrics using Alternative Yarns

2016 ◽  
Vol 13 (2) ◽  
pp. 67
Author(s):  
Engku Liyana Zafirah Engku Mohd Suhaimi ◽  
Jamil Salleh ◽  
Suzaini Abd Ghani ◽  
Mohamad Faizul Yahya ◽  
Mohd Rozi Ahmad
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
The Other ◽  
Silk Fabrics ◽  
Recovery Angle ◽  
Made In

An investigation on the properties of Tenun Pahang fabric performances using alternative yarns was conducted. The studies were made in order to evaluate whether the Tenun Pahang fabric could be produced economically and at the same time maintain the fabric quality. Traditional Tenun Pahang fabric uses silk for both warp and weft. For this project, two alternative yarns were used which were bamboo and modal, which were a little lower in cost compared to silk. These yarns were woven with two variations, one with the yarns as weft only while maintaining the silk warp and the other with both warp and weft using the alternative yarns. Four (4) physical testings and three (3) mechanical testings conducted on the fabric samples. The fabric samples were evaluated including weight, thickness, thread density, crease recovery angle, stiffness and drapability. The results show that modal/silk and bamboo silk fabrics are comparable in terms of stiffness and drapability, hence they have the potential to replace 100% silk Tenun Pahang.

Basic set of experiments for determination of mechanical properties of sand

2014 ◽  
Vol 62 (1) ◽  
pp. 129-137
Author(s):  
A. Sawicki ◽  
J. Mierczyński
Keyword(s):  
Mechanical Properties ◽  
Soil Mechanics ◽  
Physical And Mechanical Properties ◽  
Local Strain ◽  
Initial State ◽  
Laboratory Equipment ◽  
Additional Information ◽  
Basic Set ◽  
Initial Anisotropy

Abstract A basic set of experiments for the determination of mechanical properties of sands is described. This includes the determination of basic physical and mechanical properties, as conventionally applied in soil mechanics, as well as some additional experiments, which provide further information on mechanical properties of granular soils. These additional experiments allow for determination of steady state and instability lines, stress-strain relations for isotropic loading and pure shearing, and simple cyclic shearing tests. Unconventional oedometric experiments are also presented. Necessary laboratory equipment is described, which includes a triaxial apparatus equipped with local strain gauges, an oedometer capable of measuring lateral stresses and a simple cyclic shearing apparatus. The above experiments provide additional information on soil’s properties, which is useful in studying the following phenomena: pre-failure deformations of sand including cyclic loading compaction, pore-pressure generation and liquefaction, both static and caused by cyclic loadings, the effect of sand initial anisotropy and various instabilities. An important feature of the experiments described is that they make it possible to determine the initial state of sand, defined as either contractive or dilative. Experimental results for the “Gdynia” model sand are shown.

PREPARATION AND CHARACTERIZATION OF REPROCESSED COMPOSITES OF POLYPROPYLENE REINFORCED BY WOOD FIBERS: PHYSICAL AND MECHANICAL PROPERTIES

2017 ◽  
Author(s):  
Thais Helena Sydenstricker Flores-Sahagun ◽  
Kelly Priscila Agapito ◽  
ROSA MARIA JIMENEZ AMEZCUA ◽  
Felipe Jedyn
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Wood Fibers
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