Search results

Experimental Study on Steel slag-limestone Powder Concrete After Freezing and Thawing Cycles Mingzhen Han, Zhiyun Zhou, Fei Yang,Yawei Zhan (Department of Civil Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China) Keywords: Steel slag,limestone powder,concrete,mechanical property, frost-resistance Abstract:Using the fast freeze-thaw test method, we tested the loss modulus and compressive strength of steel slag-limestone powder concrete after 0,25 times,50 times,75 times,100 times freeze-thaw cycle,studied the mechanical properties and frost resistance performance after the freeze-thaw cycle.
The results showed that adding a certain amount of steel slag-limestone powder does not affect the anti-frost property of concrete; established different dosage of steel slag concrete freeze-thaw damage model: y = a + bx + cx2, degree of fitting is better; large quantity of steel slag used in concrete shall be a wider range of research.
Although many scholars made many research in the limestone powder and steel slag replacing cement, but both in mixed with concrete at the same time,the research on anti-frost property is relatively small.
By using the ordinary concrete long-term performance and durability test method , we tested the mechanical properties after freezing and thawing of 0~100 times.
Study on the durability of HPC under combined action of damage factors.Wuhan :Wuhan University Of Technology,2010.

Abstracts:This paper investigate the mechanical property and microstructure of girth weldment of Lan Zhou to Cheng Du crude oil pipeline.
Microstrure of the whole weld joint is mainly polygonal ferrite and granular bainite, this is the reason that mechanical properties can meet the Lan Zhou to Cheng Du crude oil pipeline project requirement.
Low temperature impact toughness is the key factors to determine whether the girth weld joint can work for a long time.
Impact energy of Heat affected zone is general, even in weld metal -20 ˚C, higher than that of weld metal, demonstrating heat affected zone has good welding stability.
And hard zone or soft zone didn’t exsited in heat affected zone.

The optimal mechanical properties of silica-filled vulcanizates are observed at the ELMWNR-28 (28 mol% epoxide) loading of 10 phr.
The incorporation of ELMWNR with 28 and 51 mol% epoxide groups into NR compounds introduces a second glass transition temperature and affects on their dynamic mechanical properties.
Introduction Good dispersibility of filler in the filled-rubber compounds improves physical and mechanical properties such as tensile strength, elongation at break, abrasion and fatigue resistance.
Dynamic mechanical properties are displayed in Fig. 2(b).
The optimal mechanical properties of silica-filled NR vulcanizates are obtained by using ELMWNR with 28 mol% epoxide at a concentration of 10 phr.

Among others, AZ31 alloy is the most common wrought magnesium alloy used for lightweight components in the aerospace, automotive industries, portable electronic devices and sports equipment due to its combination of mechanical and physical properties [1].
Despite intensive forming the grains were equiaxed (25.1 – 28.4 µm) due to recrystallization with insignificant differences in mechanical properties [8].
The plastic strength properties for the orientation are also close to A and B.
Larger affected volume in spherical nanoindentation leads to evaluation of effective plastic properties for the sample irrespective of the crystallographic orientation.
Němeček, Microstructure and Micromechanical Properties of Mg Microtubes Prepared by Laser Dieless Drawing, Key Eng.

There are many factors which affect the fatigue performance of the iron and steel products, such as product surface defects (cracks, scratches, bumps), decarburization, inclusions, etc.
The non-metallic inclusion becomes one of the most important factors which influence the service life of metallic material.
So we have to face with an urgent problem how the inclusions infect the fatigue properties of high strength steel.
The oxide inclusions are generally harmful to the fatigue properties, and the damage degree determines by the differences of their phase, size and location.
One of the reasons why the inclusion will affect the fatigue properties of steel product is that the deformation rate of the inclusion and the substrate is inconsistent.

The microstructure of heavy section ductile iron determines its mechanical properties.
There are many factors influence the microstructure, such as chemical composition, cooling rate, liquid treatment and heat treatment[2-5].
For identical conditions, cooling rate plays a significant role in determining the microstructure and hence mechanical properties of heavy section ductile iron [4].
Ductile iron suffers from non-spherical graphite formation due to long time solidification in heavy section castings, which is detrimental to the mechanical properties and restricts its applications[6-9].
On the other hand, the matrix microstructure affects mechanical properties where the softer ferrite gives higher ductility but lower yield strength than pearlite[4].

The input parameters of FC-CBGA from industry was used for simulation and the properties of commercial underfill were extracted by using Thermal Mechanical Analyzer (TMA) and Dynamic Mechanical Analyzer (DMA).
Differences in surface roughness, cleanliness, solder mask properties on the substrate and passivation properties on the silicon die could result in very different fillet geometries for the same underfill.
Dynamic mechanical properties such as Young’s modulus of cured samples were determined from -50 0C to 210 OC using DMA techniques.
The thermo-mechanical properties of components in FC-CBGA is shown in Table 1.
The material properties used in the computational modeling are given in Table 1..

Theoretically, WSP could improve the mechanical properties, durability and ductility of concrete fundamentally.
Steps and methods Mechanical properties experiment.
The mechanical properties experiments are carried out in the standard laboratory at room temperature.
The mechanical properties test results of various types of concrete can be seen in Table3.The standard deviation are also shown in the table in the brackets.
Secondly, WSP concrete has good mechanical properties.

Hence, achieving the desired hole quality is of great importance for the functional behaviour of the mechanical parts.
Experiments are performed under different magnetic drilling conditions of spindle speed, feed rate and drill diameter on CNC drilling machine using three levels of factors.
A procedure has been adopted to assess and optimize the chosen factors by the use of Box Behnken design to analyse the effects of different parameters.
Nouari M. et al. [3] provided necessary information about the main factors affecting the hole quality i.e. cutting speed, temperature, feed rate, geometrical parameters as well as the influence of the cutting conditions and the temperature on the tool life in drilling.
The mathematical expression of relationship of the surface roughness parameter with the three variables (feed rate, speed, drill diameter) is shown below as in terms of actual factors.

It can be inferred different factors, including the initial supporting force, the strength of the bolting-grouting body and internal friction angle, influence the T.
Deformation partition ratio T depends entirely on the inherent mechanical properties of rocks and the bolting-grouting materials.
However, in this state the mechanical properties of materials have been inhibited, resulting in materials waste and the cost of the projects increasing.
From the perspective of stress, the mechanical properties of materials have been fully used, and it is the most economical status.
Rock deformation partition ratio depends entirely on the inherent mechanical properties and deformation characteristics of rocks.