Search results

Physical properties of glazed hollow beads Performance Packing density[kg/m³] Particle size[mm] Water absorption rate[%] Index 104 ﹤1.25 42.5 1.2 Mixture ratio design Designed according to L9(34), orthogonal experiments are on the three factors and three levels, examining the effect of various factors on dry density and compressive strength of the insulation mortar.
Experimental factors and levels selected are shown in Table 2.
Analysis of structure and morphology 3.1 Analysis of the morphology and structure of pores in the mortar Sizes, morphology and distribution of pores in foam glazed hollow bead are keys to influencing mechanical properties and thermal insulation properties.
The whole system has a certain ability to resist damage, and improve the overall mechanical properties of thermal insulation mortar. 4.
Conclusions (1) Among the three factors of glazed hollow beads content, water-cement ratio and foaming agent content, water-cement ratio is the most important factor for affecting the performances of the foam glazed hollow beads thermal insulation mortar.

The Study on Mechanical Properties in Narrow-Gap Welds for SA312 TP347 Seung-Wan Woo1,a, Choon-Yeol Lee1,b, Jae-Do Kwon1,c, Young-Hwan Choi2,d and Ho-Sang Shin2,e 1 Department of Mechanical Engineering, Yeungnam University 214-1 Dae-dong, Gyongsan, Gyongbuk 712-749, Korea 2 Korea Institute of Nuclear Safety 19 Kusong-dong, Yusong-ku, Taejon 303-338, Korea a lagmisia@yumail.ac.kr, cylee@yu.ac.kr (Corresponding Author), cjdwon@yu.ac.kr d yhchoi@yumail.ac.kr, ehsshin@kins.re.kr Keywords: Narrow-gap weld, Stainless steel, General weld, Repair weld, Stress corrosion crack Abstract.
Performed are various mechanical tests to investigate microstructure, tensile strength and so on.
It is verified that the mechanical properties of stainless steel are slightly changed after repair welding process.
In addition, this welding process becomes a major time consuming factor in the whole construction period, because it generally requires more than 7 months to complete installation of the pipes.
Summary This study performed various tests to investigate mechanical properties of the general welding material (SAW) and repair welding material (SRW) using the stainless steel of SA312 TP347, which is used in the pipe system of a nuclear power plant by applying a narrow-gap welding method.

Some academics have also studied the strength and mechanical properties of concretion stones [6,7].
In this paper, combination of factors affecting the stones strength, the data of grouting concretion stones strength obtained by test is regression predicted based on support vector machines method.
These factors are inextricably linked with particle size of soil media, so the particle characteristic is the key factor to affect the soil permeability and the physical properties of grouting concretion stones.
Finally, grouting concretion stones strength is affected by many factors, and it will be changed in any factors changing.
"Analysis of Factors Affecting the Strength of the Grouting Stones.

There have been tremendous researches on carbon nanotubes (CNTs) and CNTs reinforced composites due to their excellent mechanical, electromagnetical and thermal properties.
In order to investigate how the aligned multi-walled CNTs affect the mechanical properties of the multi-scale composites, a representative volume element is used to simulate the multi-walled CNT pullout process by means of the finite element method.
Introduction Since the observation by Iijima in 1991[1], carbon nanotubes (CNTs) have led to a wave of discoveries in most areas of science and engineering due to their unprecedented physical and chemical properties, such as excellent mechanical, outstanding electrical and exceedingly good thermal properties[2,3].
Shi, Carbon nanotube/carbon fiber multiscale composite: influence of interfacial strength on mechanical properties, Journal of Inorganic and Organometallic Polymers and Materials. 21(2011) 937-940
Gunko, Small but strong: a review of the mechanical properties of carbon nanotube-polymer composites, Carbon. 44(2006) 1624-1652

Furthermore, the initial threshold limits of their maximum stress intensity factors were measured.
Table 1 shows its mechanical properties [6].
Table 1 Mechanical properties of the Si3N4 specimens [6].
Table 1 shows the relation between initial crack lengths and the initial maximum stress intensity factors.
The values of initial maximum stress intensity factors KImax were calculated before the fatigue tests.

Using Atomic Force Microscopy to Retrieve Nanomechanical Surface Properties of Materials S.
Besides topographical visualisation, many surface properties of materials (e.g. mechanical, tribological, chemical, thermal, electric and magnetic) can be studied by using this tool [2].
In this work, the effect of some of these factors on the accuracy of nanomechanical properties evaluation, by using atomic force microscopy techniques, is analysed.
In this way, other factors must be considered, which will be briefly discussed in the next section.
Material related factors that can affect nanomechanical tests Once instrumentation and measurement errors are minimized, as discussed in the previous sections, the differences between nanomechanical and micromechanical properties (Table 1) must be attributed to material related factors, which are "hidden" in macro and microscale tests but become relevant in tests performed at nanoscales.

SECURING SUPERIOR PROPERTIES OF COMPOSITE (PP+ WF) THROUGH CENTRAL COMPOSITE DESIGN A.
Due to numerous attractive properties, use of composites is in increasing trend.
The purpose of this project is to optimize the mechanical properties of composite (polypropylene + wood fiber) using Central Composite Design (CCD) technique.
The values of the coded variables can be obtained with following transformation: Coded Variable = lnXi – ln(central) ln(max) – ln(central) Figure 1: Geometric representation of CCD with 3 factors The coded variable allows an experimenter to investigate the relative importance of the design factors or parameters.
Hence a superior composite in terms of mechanical properties is possible to be attained by optimization of the three processing parameters through RSM and the derived models can be reliably used to predict the functional properties of the composite in terms of the processing parameters at least within experimental limits.

Therefore, after considering these factors, the Fe80Ni20 alloy was chosen.
It has received much attention because of its exceptional physical and chemical properties, especially its high electrical conductivity [20], higher mechanical properties [21], and substantial theoretical particular surface area [22].
The addition of graphene affects structural properties such as crystallite size being reduced to 6.65 nm and the lattice parameter increasing to 0.28704 nm.
Zandrahimi, Microstructural and magnetic properties of nanostructured Fe and Fe50Co50 powders prepared by mechanical alloying, J.
He, Structure and magnetic properties of Fe1− x C x, solid solution prepared by mechanical alloying.

This paper presents a study on the machining quality of prototype model, and points out its important influencing factors including shaping room temperature, shrinkage ratio of material and wet condition of support material and so on.
The Key Influence Factors on Quality of FDM Prototype Model Shaping Room Temperature.
The nozzle temperature determines adhesive and packing properties, the width and flow of extruding fuse in FDM.
The writer analyzes the key factors influencing the quality of FDM prototype and provides some practical solutions for the problems that may occur during operation.
Hong: Mechanical Science and Technology for Aerospace Engineering Vol. 26(2007), p. 1652-1656, 1660

Processibility and mechanical properties of mullite-filled styrene butadiene rubber composites Qiongqiong Liu　 Department of Materials and Engineering, Xuzhou College of Industrial Technology, Xuzhou, Jiangsu, China 　eliuqq@163.com　 Keywords: mullite, SBR materials, fillers, cure characteristics, mechanical properties Abstract.
The presence of the silane coupling agent can enhance mechanical properties of filled SBR vulcanizates to some extent.
The properties of the compounds (cure characteristics, processability) and mechanical properties of vulcanizates with various filler loadings were investigated.
Mechanical properties of SBR vulcanizates The mechanical properties of filled rubbers are usually described in terms of tensile and tear strength, Young’s modulus, hardness, resilience and abrasive loss.
Silica provides better mechanical properties than mullite