The Mechanical Properties of Soils with Uneven Grain-Size Distribution

2014 ◽  
Vol 1073-1076 ◽  
pp. 1689-1696
Author(s):  
Zaven Ter-Martirosyan ◽  
Anatoly Mirnyy ◽  
Armen Ter-Martirosyan
Keyword(s):  
Mechanical Properties ◽  
Laboratory Tests ◽  
Granulometric Composition ◽  
Strain State ◽  
Analytic Solutions ◽  
Diameter Ratio ◽  
Selection For ◽  
Stress States ◽  
The Impact

This issue deals with peculiarities of stress-strain state forming in a representative volume of inhomogeneous soil. Analytic solutions for describing such stress states and obtaining equivalent mechanical values for such massive are given. Basing on the performed triaxial laboratory tests the impact of diameter ratio, percentage, and contact between particles on mechanical properties of a mixture is estimated. As a conclusion some recommendations on using the research results in practical geotechnical engineering are given. The classification of inhomogeneous soils, based on granulometric data, allowing to estimate mechanical properties is presented, as a method of granulometric composition, humidity and density selection for artificial foundations.

scholarly journals Investigation of the dispersion processes of composite colloidal capillary-porous materials

2019 ◽  
pp. 21-25
Author(s):  
Zh.O. Petrova ◽  
V.M. Vyshnievskyi ◽  
Yu.P. Novikova ◽  
A.I. Petrov
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Porous Materials ◽  
Material Flow ◽  
Maximum Yield ◽  
Flow Through ◽  
The Impact ◽  
First Time ◽  
Brittle State

The technology of drying colloidal capillary-porous materials to a final humidity of 6-8%, developed at the Institute of Technical Thermophysics of the NAS of Ukraine, allowed to obtain a brittle state, in which it is possible to grind this product to small particles. The most suitable for industrial grinding of the dried composite colloidal capillary-porous materials is the impact method, because when wiping and crushing the material has accumulated, stuck to the working surface. Powders are characterized by one pronounced maximum corresponding to the particle size of the powder of 0,16 mm. As the rotation speed of the shredder rotor changes, the particle size distribution of 0,16 mm increases by reducing the larger particles. The amount of powder thus obtained is directly proportional to the speed of rotation of the rotor. The study of the dispersion and classification of functional powders showed that all powders have the largest particle size of 0,16 mm. The maximum yield of this fraction is 70% and the lowest is 40%. The structural-mechanical characteristics of powders from composite colloidal capillary-porous materials were investigated for the first time.  Characteristics of different fractions were determined by such parameters as bulk density, vibration density, angle of natural slope, speed of material flow through the funnel and others. Studies to determine the structural and mechanical properties of functional powders have shown that they can be attributed to more bulk powders, as opposed to highly bound monopowders.  Creating compositions improves their structural and mechanical properties.

The Impact of Corrosion on the Mechanical Behavior of Bolt

2010 ◽  
Vol 168-170 ◽  
pp. 408-411
Author(s):  
Xiao Yong Li
Keyword(s):  
Mechanical Properties ◽  
Experimental Investigation ◽  
Corrosion Test ◽  
Laboratory Tests ◽  
Structural Integrity ◽  
Mechanical Performance ◽  
Rock Bolt ◽  
Before And After ◽  
The Impact ◽  
Strength And Ductility

Corrosion is a negative contributor on the structural integrity of rock bolt and leads to degradation of the mechanical properties of steel rock bolt. Exposure to chloride, seawater, salt and saltwater and deicing chemical environments influences rock bolt and weakens it. In order to evaluate the influence of corrosion and the size of the steel on the mechanical properties of rock bolt, an experimental investigation was conducted on rock bolt whose rebar is 8, 12, 16, and 18 mm diameter, and which were artificially corroded for 10, 20, 30, 45, 60, 90, and 120 days. By the simulation corrosion test of loaded and unloaded bolts in Na2SO4 solution, the relation curves of the mechanical performance with the corrosive conditions and the corrosion time are given. The mechanical performance is compared between these two types of bolts. At the same time, the influential trend of the load on the mechanical performance of the corroded bolt is analyzed. The laboratory tests suggest that corrosion duration and rebar size had a significant impact on the strength and ductility degradation of the specimens. after being corroded in Na2SO4 solution, both the ultimate bearing capacity and the maximal tensility of loaded bolt decrease far more than those of unloaded bolt, and the endurance and service life of loaded bolt will also be shortened much more severely. The tensile mechanical properties before and after corrosion indicated progressive variation and drastic drop in their values.

The Impact of Corrosion on the Mechanical Properties of Smooth Steel Rebar HPB235

2011 ◽  
Vol 179-180 ◽  
pp. 28-31
Author(s):  
Xiao Yong Li ◽  
Zhi Gang Zhang
Keyword(s):  
Mechanical Properties ◽  
Experimental Investigation ◽  
Laboratory Tests ◽  
Structural Integrity ◽  
Strength Degradation ◽  
Progressive Reduction ◽  
Steel Rebar ◽  
Steel Bars ◽  
Before And After ◽  
The Impact

The Impact of Corrosion on the Mechanical Properties of Smooth Steel Rebar HPB235 The impact of corrosion on the mechanical properties of steel rebar was examined. An experimental investigation was carried out in order to gain better insight of the effect of corrosion on the mass loss, strength, of smooth Steel Rebar HPB235 10 mm diameter steel bars that were artificially corroded for different corrosion levels. Corrosion is a negative contributor on the structural integrity of concrete structures and leads to degradation of the mechanical properties of steel rebar. In order to evaluate the influence of corrosion on the mechanical properties of steel rebar, an experimental investigation was conducted on smooth steel rebar of 10 mm diameters, and which were artificially corroded for 1, 3, 5 and 7 months. The laboratory tests suggest that corrosion duration had a significant impact on the strength degradation of the specimens. The mechanical properties of tensile test before and after corrosion indicated progressive variation and drastic drop in their values. The corrosion enhanced the damage and created pits and notches, resulting in stress concentration points and progressive reduction of strength. It gets the express formula nominal ultimate strength and nominal yield strength.

EVALUATING THE IMPACT OF MAINTENANCE TO ABRASION RESISTANCE AND TEAR STRENGTH OF COATED FABRICS

2016 ◽  
pp. 201
Author(s):  
Ada Traumann ◽  
Merje Beilmann ◽  
Diana Tuulik
Keyword(s):  
Mechanical Properties ◽  
Abrasion Resistance ◽  
Laboratory Tests ◽  
Water Resistance ◽  
Coating Application ◽  
High Durability ◽  
Coated Fabrics ◽  
The Impact ◽  
Drying Test ◽  
Domestic Care

The purpose of this paper was to evaluate the impact of maintenance to some mechanical properties of coated fabrics. Polyester is often used for outerwear because of its high durability. Coating application enhances several physical – mechanical properties of fabric. The reverse side of the test fabrics were laminated with a thin layer of the membrane to ensure complete water resistance. Since the micro-pores are sufficiently small, they will not let water through, but they let vapour through from inside to outside. It makes these kind fabrics vapour-permeable and therefore very comfortable for wearing. Although we can damage the micro-pores in the fabric very quickly whether by false maintenance mode at home for washing or drying. Test fabrics of this study were chosen from kid`s outerwear collection. Kids are good for testing of ready to wear garments but this time, the emphasis was on laboratory tests of basic fabrics. The aim of this study was to test the outer fabric under the conditions of domestic care and thereafter to carry out tests on abrasion resistance and tearing of cared fabrics.  

Loading Subspace Selection for Multidimensional Characterization Tests via Computational Experiments

2010 ◽  
Author(s):  
A. P. Iliopoulos ◽  
J. G. Michopoulos
Keyword(s):  
Strain State ◽  
Material Testing ◽  
High Dimensional ◽  
Virtual Experiments ◽  
Selection For ◽  
Subspace Selection ◽  
Strain Space ◽  
Systematic Program

To pursue characterization of composite materials, contemporary automated material testing machines are programmed to follow loading paths in multidimensional spaces. A computational methodology for selecting the best loading subspace among all those possible is formulated and presented in this paper. The criterion for subspace selection employed is based on the assessment of which among the possible subspaces generates the richest set of strain-states as compared to those of the union of all possible 4D loading spaces. A systematic program of simulation sequences of virtual experiments is presented and the concept of strain state cloud (SSC) is introduced as a high dimensional volumetric histogram describing the frequency of appearance of each strain state within the corresponding strain space. Comparison of the SSCs for each of the fifteen 4D subspaces relative to the full 6D space allows a ranking classification of each subspace. Based on this ranking we select the three top cases as being those considered for actual testing.

Effect of combined drink cans and steel fibers on the impact resistance and mechanical properties of concrete

2020 ◽  
Vol 14 (2) ◽  
pp. 6734-6742
Author(s):  
A. Syamsir ◽  
S. M. Mubin ◽  
N. M. Nor ◽  
V. Anggraini ◽  
S. Nagappan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Reinforced Concrete ◽  
Impact Resistance ◽  
Fiber Reinforced Concrete ◽  
Steel Fibers ◽  
Fiber Reinforced ◽  
Indirect Tensile ◽  
The Impact

This study investigated the combine effect of 0.2 % drink cans and steel fibers with volume fractions of 0%, 0.5%, 1%, 1.5%, 2%, 2.5% and 3% to the mechanical properties and impact resistance of concrete. Hooked-end steel fiber with 30 mm and 0.75 mm length and diameter, respectively was selected for this study.  The drinks cans fiber were twisted manually in order to increase friction between fiber and concrete. The results of the experiment showed that the combination of steel fibers and drink cans fibers improved the strength performance of concrete, especially the compressive strength, flexural strength and indirect tensile strength. The results of the experiment showed that the combination of steel fibers and drink cans fibers improved the compressive strength, flexural strength and indirect tensile strength by 2.3, 7, and 2 times as compare to batch 1, respectively. Moreover, the impact resistance of fiber reinforced concrete has increase by 7 times as compared to non-fiber concretes. Moreover, the impact resistance of fiber reinforced concrete consistently gave better results as compared to non-fiber concretes. The fiber reinforced concrete turned more ductile as the dosage of fibers was increased and ductility started to decrease slightly after optimum fiber dosage was reached. It was found that concrete with combination of 2% steel and 0.2% drink cans fibers showed the highest compressive, split tensile, flexural as well as impact strength.    

LABORATORY TESTS OF THE PHYSICAL-MECHANICAL PROPERTIES OF MATERIALS FOR REMEDIAL JOBS

2020 ◽  
pp. 58-63
Author(s):  
M.A. Druzhinin ◽  
◽  
G.V. Okromelidze ◽  
O.V. Garshina ◽  
I.A. Kudimov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Laboratory Tests ◽  
Mechanical Properties Of Materials ◽  
Properties Of Materials
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