bluuebunny/crossref_metadata_2025 huggingface dataset:
The Static Stress Intensity Factor around the Anti-Plane Crack in an Orthotropic Functionally Graded Material
Authors: Zhang Xue Xia , Hu Zhi Xin , Zhao Wen Bin , Li Chan
Published: March 2013

The problem of anti-plane crack in infinity orthotropic functionally graded materials is studied by using of integral transforms-dual integral equations. The shear modulus in the two principal directions of the functionally graded material was assumed to vary proportionately as gradient model of double parameters. And the variation curves of the dimensionless stress intensity factor with the orthogonal parameter and the crack length have been obtained by using the mathematical software .The results shows that stress intensity factor increases with the increasing of and a. It means that stress intensity factor decreases as the shear modulus of perpendicular to crack direction increased.
Hydration Activity of Silica Fume and its Effect on the Structure of C-S-H Gel
Authors: Wang Lei , He Zhen , Yan Jianjun
Published: March 2013

Hydration activity of silica fume(SF) and its effect on the structure of C-S-H gel in silica fume-cement (SFC)pastes was studied by FTIR and 29Si MAS NMR combined with deconvoluton technique, respectively. The experimental results indicate that the cement of 48% and the SF of 41% can react in the paste with SF replacement for cement was 10% by weight and the average chain length (ACL) of SiO4 and/or AlO4 tetrahedra in C-S-H was 3.0 at 3d. At 120d, the cement of 65% and the SF of 96% could react, and the ACL of C-S-H was 3.7, which was higher than that in the plain cement paste (ACL was 3.1). In the highly alkaline environment of the cement paste, pozzolanic reaction of silica fume can potentially occur in two ways, the monosilicate formed after the structure of silica fume were broken can combine with Ca cations to form C-S-H directly. Moreover, these chemical species can also connect C-S-H dimers into highly polymerized C-S-H and increase the ACL of C-S-H.
Effects of Warm Mix Asphalt (WMA) Additives on the Properties of WMA Mixtures
Authors: Zhu Hong , Xie Zhao Xing , Fan Wen Zhong , Wang Li Li , Shen Ju Nan
Published: March 2013

The objective of this research was to investigate the influence of Warm Mix Asphalt (WMA) additives on asphalt mixture properties through the laboratory testing programs such as air voids, tensile strength ratio (TSR), dynamic stability, and low temperature bending failure strain tests. The experimental design included the use of three WMA additives of Sasobit, Evotherm and Rediset, one base (unmodified) binder source, and one modified binder source. The WMA mixtures were compared to those of controls, i.e., mixtures without the additives. Results from this study showed that: (1) WMA mixtures with Rediset, Evotherm, and Sasobit had slightly higher air voids than Hot Mix Asphalt （HMA）; (2) All WMA mixtures with SBS modified asphalt have lower TSR values than the original ones. The TSR of the WMA mixtures with base (unmodified) asphalt is not significantly different from HMA; (3) The WMA mixtures with SBS modified asphalt have lower values of the dynamic stability and bending failure strain than HMA, while the WMA mixtures with base asphalt are contrary, except with Rediset additives.
Research on Barite Concrete Mixed with Fly Ash
Authors: Zou Qiu Lin , Li Jun , Lai Zhen Yu
Published: March 2013

Barite concrete with density grade of 3 and strength grade of C30 was prepared by mixing with different fineness of fly ash. The workability, mechanical properties and long-term high temperature performance of the prepared barite concrete were researched. Results show that the workability of barite concrete is improved by mixing with fly ash, and no segregation of mixture has been observed. The apparent density and 3d, 28d compressive strength of barite concrete are decreased obviously after mixing with fly ash. But with the increasing of the fineness of fly ash, the apparent density and 3d, 28d compressive strength of barite concrete have a slight increase. High temperature residual compressive strength is decreased with the increasing of temperature. The cycle times of heat treatment at 400°C only has a little effect on residual compressive strength of barite concrete.
Numerical Analysis for Drying Creep Behavior of Self-Compacting Concrete
Authors: Chen Ya Liang
Published: March 2013

Drying creep of self-compacting concrete (SCC) has two different sources: microcracking and stress-induced shrinkage. Based on theory for pore water and microcracking theory of concrete, the model for drying creep caused by constant stress is derived from rheological equations. The proposed model is coupled with FEM analysis by recursive calculation, so that the creep caused by changing load can be calculated without considering stress history. Verification of the model is conducted through comparison with experimental result and Bazant’s empirical model. The comparing results validate the model for drying creep of SCC.
Fatigue Crack Propagation Prediction under Single Overload Variable Loading
Authors: Liu Zhi Fang , Gu Li Xiong , Xu Zhong Yong
Published: March 2013

Reasonably predicting the fatigue life of specimens, depends on the research and understanding of the fatigue crack propagation behavior under variable amplitude loading (VAL) rather than under constant amplitude loading (CAL). The present study aims at evaluating residual fatigue life under single overload VAL by adopting a dynamical coefficient mechanics (DCM) model which we have reported. New formulas connecting the crack length with number of cycles and expressions for the fatigue crack propagation (FCP) under single overload VAL have been derived and were used to predict crack propagation. The ratios of predicted-to-experimental lives range from 1.00 to 1.09, which indicates that the results obtained from this DCM model are in good agreement with experimental data from published literatures and cover all stages of fatigue crack growth curve.
The Analysis of Ceramic Cutting Tools Durability in Machining Process of Steel C60 Applied According to Standard ISO 3685
Authors: Panda Anton , Duplák Ján , Jurko Jozef , Behún Marcel , Jančík Marek
Published: March 2013

Very important cutting tool property is its durability. Durability of cutting tool defines lifetime of this cutting tool and it determines its suitability for select technological operation. Technical science defines a lot of different factors, that they may be cause of shorter cutting tool lifetime. For increase cutting tool durability is necessary maximally possible elimination of these factors. Determination of cutting tool durability is very important, because provides comprehensive information how to determine appropriate technological conditions for selected cutting tool. In engineering is for determination of cutting tools durability used T-vc dependence. The article describes process how to create durability dependence for cutting tools made of cutting ceramic by means of T-vc dependence in machining process of C60.
The Deposition Methods of CsI and Ni Tubes in the AAO Template
Authors: Chang Shao Fu , Kao Mann Juin , Kuo Chin Guo , Chen Chien Chon , Huang Ker Jer
Published: March 2013

This paper discussed the fabrication of cesium iodide (CsI) and nickel (Ni) tubes in the anodic aluminum oxide (AAO, Al2O3) template by dropping-drying, electroless deposition, and anodization processes. The CsI dopes with Tl as scintillator can converts incident X-ray into visible light with very high conversion efficiency of optical photons. The CsI compound is so soft and extremely hygroscopic, it is very difficult to polish to obtain a smooth and optical flat plane. However, the nano-scale flat plane can be achieved when CsI was deposited in AAO template. The ionic compound of CsI can dissolve in water to form I- and Cs+. And, I- and Cs+ can absorb on AAO to form crystalline CsI after removing or drying water. Because CsI has a good wetting adhesion with AAO CsI can easily form nanoparticles and further thin film on AAO wall.
Nanowelding Technology Study Based on Simulation Methods
Authors: Liu Xuan , Sun Pu , Wu Yan Xiang , Xu Zhe , Wu Ying , Chen Hong Wu
Published: March 2013

Simulation study on nanowelding technology is important to improve nanowelding parameters, analyze the properties of welded structure, reveal the mechanism of nanowelding. In this paper, the progress of simulation study on nanowelding technology has been reviewed. The key and difficulties of this technology are proposed. The applications of molecular dynamics and quantum mechanics in nanowelding simulation study are introduced. Nanowelding technology is studied by molecular dynamics (MD) method, and the mechanism of ultrasonic nanowelding is revealed.
Research on Oxygen Embrittlement Phenomenon of Interface of Titanium/Steel Explosive Welding Laminates
Authors: Liu Peng , Guo Hong Gui , Jiang Jian Ping , Sun Bai Lian
Published: March 2013

Optical metallographic examination, scanning electron microscope as well as energy dispersive X-ray spectrometry was operated to the interface of titanium/steel laminates manufactured by explosive welding. Brittle Ti-Fe-O layer was found at the interface of titanium/steel laminates, and microcosmic crack was found perpendicular to the interface of titanium/steel laminates in the brittle Ti-Fe-O layer. The reason for the emergence of brittle Ti-Fe-O layer was analysed.
Thermodynamics and Phase Constituents of Laser Induced In-Situ-Fabrication of TiB2 Ceramic Coating on Ti-6Al-4V
Authors: Zhang Duo , Yang Yu Ling , Ju Yi
Published: March 2013

In-situ fabrication of TiB ceramic coating by laser cladding technology (LC) was investigated. Pulsed YAG laser with the power of 500 W was used. The mixture of Titanium powder (with the size of 20 m) and B powder (with the size of 140 m) were utilized as the precursor. The reactive transformation mechanism and phase constituents of the in-situ fabricating coating during the laser cladding process were studied by thermodynamics analysis, as well as XRD methods. Gibbs free energy theory was used to calculate the increment of Gibbs free energy at different temperature. The results show that the increment of the Gibbs free energy for the reaction equation to the in-situ fabricate TiB2 keep to be negative within the temperature of 3000K, this indicate that TiB2 can be obtained by laser cladding the mixture powder of Ti and B. XRD results show that the main phases of the coating are TiB2, TiO2 and B2O3 with relative percentage of 67.6%, 18.0% and 14.4%, respectively.
Research Progress of the Methods of Acid Mist Suppression
Authors: Wang Hong , Yu Xiang , Sun Yan Lin , Huang Yun Hua
Published: March 2013

Abstract: Acid mist suppression has always been a huge challenge, which troubled in metallurgy and metal products processing industries. According to the physical and chemical processes, the methods of acid mist suppression are discussed systematically in this paper. The application prospect of a new type of polymer microspheres used as acid mist suppressants is also presented in detail.
Facile Synthesis of Dye Waste-Calcium Fluoride Hybrid Absorbent and Application to Dye Wastewater Treatment
Authors: Zhao Dan Hua , Liu Xiao Jun , Zhang Xiu Lian , Yin Wei
Published: March 2013

A new hybrid material of CaF2/ABB6B (CFAB) was developed by the template-free hybridization of acid brilliant blue 6B (ABB6B) with CaF2. The composition and structure of the material were determined and characterized. In contrast to conventional sorbents, the hybrid material contains lots of negative charges as the basis of specific adsorption. The efficient removal of cationic dyes of victoria blue B (VBB), ethyl violet (EV) and basic brilliant blue BO (BBBO) indicates that it has an improved adsorption capacity and selectivity with a short removal time less than 5 min; while the hybrid sorbents fit the Langmuir isotherm model. Instead of using ABB6B reagent, an ABB6B-producing wastewater was reused to prepare the cost-effective sorbent, and the equilibrium adsorption capacities of which reached 46.29 mg•g-1, 24.81 mg•g-1 and 30.40 mg•g-1 for VBB, EV and BBBO, respectively. The sorbent was then used to treat the actual wastewater samples with satisfactory results of over 96% decolonization and 82% COD-decreasing. This work has developed a simple and eco-friendly method for synthesizing a practical and efficient sorbent. The results shown that the hybrid adsorption material has ideal decolorization and COD lowering efficiency and a good application prospect in dye industrial wastewater treatment.
Effects on Morphology Change on the Mg-Doped Zinc-Oxide Surface Measured by Changing the AFM Feedback Speed
Authors: Fan Zhe , Yuan Dong Qing , Ma Xiao Ping , Huang Yan , Zhou Zhen
Published: March 2013

Use Atomic Force Microscope to analyze surface morphology of the laboratory prepared Mg-doped zinc oxide films and standard gratings. Main measuring method is the use of semi-contact mode of the Atomic Force Microscope (tapping mode). When parameters such as frequencies and gains do not change, we focus on the differences of the results under different feedback speed (FB) working on the specimens, and sum up the relations between the feedback speed (FB) and the definition of the surface morphology of the specimens.