Search results

(20) Study on the radial stress based on the tension-compression-ratio Generally, the tension-compression-ratio varies from 0.77 to 1.0 for ductile metal material, 0.33 to 0.77 for brittle metal material, no more than 0.5 for geotechnical material.
The tension-compression-ratio of geotechnical material is less than 0.5, therefore, the curves of sr/st relative to D is convex shape.
Included are the contribution of varying tension-compression-ratio, the formulas developed in this paper can reasonably apply to a wide range of materials with different strength in tension and compression.
Liu: China Civil Engineering Journal, Vol. 30 (1997) No.2, p.14.
Huang: Foundation of Plastic Mechanics (Science Press, China 1982).

Recent studies have focused on passive cooling using phase change materials (PCMs) integrated into heat sinks, demonstrating significant improvements in thermal performance.
The thermophysical properties of the used materials are listed in Table 1 and Table 2.
Lu, “Unidirectional freezing of phase change materials saturated in open-cell metal foams,” Appl Therm Eng, vol. 88, pp. 315–321, Sep. 2015, doi: 10.1016/J.APPLTHERMALENG.2014.09.055
Li, “Effective thermal conductivity of open-cell metal foams impregnated with pure paraffin for latent heat storage,” International Journal of Thermal Sciences, vol. 81, no. 1, pp. 94–105, 2014, doi: 10.1016/j.ijthermalsci.2014.03.006
Shi, “Experimental and numerical study on melting of phase change materials in metal foams at pore scale,” Int J Heat Mass Transf, vol. 72, pp. 646–655, May 2014, doi: 10.1016/j.ijheatmasstransfer.2014.01.003

Finite element analysis Coating materials.
In this analysis, Ti6Al4V alloy was used as a substrate material and Ni60A+WC alloy powder was used as coating materials.
Applied Surface Science.
Vol.37 (2008), p.606 (In Chinese) [5] Dongsheng Wang, ZongjunTian, Lida Shen etal: Applied Laser.Vol.28(6)(2008),p.441 (In Chinese) [6] Dongsheng Wang,ZongjunTian,Lida Shen etal: Journal of Functional Materials.
Product Development.Vol. 6(1)(2008),p.40 [11] K.DAI, L.SHAW:Metallurgical and Materials Transations.Vol. 34(5)(2003),p.1134 [12] Ping Zhang:Thermal Spray Materials.

The ingot with 25 kg is smelted and casted in vacuum induction furnace of University of Science and Technology Beijing, the ingot is rolled into 16 mm sheet by TMCP process after forging.
Table1 Chemical composition of experimental steels(mass. %) Types C Si Mn P S Als Nb Ti Ni Zr 1# 0.06 0.3 1.56 0.006 0.0043 0.03 0.04 0.01 0.32 0 2# 0.058 0.31 1.6 0.006 0.0042 0.04 0.038 0.011 0.3 0.01 3# 0.052 0.31 1.43 0.004 0.0048 0.036 0.041 0.012 0.37 0.02 Results and Discussions Low temperature toughness of base material and HAZ for different zirconium content steel The low temperature toughness at -60℃ of base materials and HAZ were shown as in Fig.1.
It was obvious that the low temperature toughness of 3# steel base material was the poorest.
Fig.1 Toughness of the base material and the HAZ for different heat input at -60 ℃ Influencing factors of inclusion morphology for base materials and HAZ The typical inclusion morphology in 2# and3 # steel containing different content zirconium was shown as in Fig. 2 and Fig.3.
Journal of University of Science and Technology BeiJing,32（2010）: 195

Study on Vibration Band Gap Characteristics of Phononic Crystal Consisted of Ti and Rubber WANG yanlin a, WANG zidong b and SONG zhuofeic School of Materials Science & Engineering, University of Science & Technology Beijing, 100083 China a WYL1921@yahoo.com.cn, b wangzdg@263.net, cSZF7870@163.com Keywords：Ti and Rubber, phononic crystal, vibration band gap Abstract：：：：The vibration band gaps of one dimensional phononic crystal of rod structure consisted of Ti and Rubber were studied using the lumped-mass method and finite element simulation, the influences of vibration band gap by the periodicity and volume fraction were discussed.
Vasseur [2] studied the material system including carbon fiber or fine carbon stick and epoxy resin, aluminum and resin et al.
Sigalas [3] studied the material system consisted of metal and resin matrix.
[2]Vasseur J O.et al.Complete acoustic band gaps in periodic fiber reinforced composite materials: the carbon/epoxy composite and some metallic systems[J].
Journal of Physics: Condensed Matter. 1994, 6: 8759-8770

Knyazeva1,2 1National Research Tomsk Polytechnic University, Institute of High Technology Physics, 2a Lenin Avenue, Building 11, Tomsk, 634050, Russia 2Institute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences, 2/4 pr.
Introduction Investigations of surface treatment process of materials by beams of charged particles are carried out by many authors [1-4].
The composition and structure, and, consequently, the surface properties of materials can be controlled owing to these methods.
In the literature, the thermoelastic waves caused by exposure to high-energy sources on the surface of materials attract the basic attention.
Knayzeva, Applied Mechanics and Materials, V. 756 (2015) 389-393

The dynamic industrial development puts higher demands for lighter and yet stronger materials.
Steel has been one of the major structural materials used in building and construction.
Materials with high specific strength (material’s strength at failure divided by the density) also known as strength-to-weight ratio are used as construction materials in aerospace, automotive applications as well as in many others industries where weight savings are much needed.
Watarai: Trends of research and development for magnesium alloys – reducing the weight of structural materials in motor vehicles.
Journal of Achievement in Materials and Manufacturing Engineering Vol. 32(1) (2009), p. 7 [5] H.

Material and Methods Sample collection.
Environmental Science Journal. 2006, 18(1):90-95
Environmental Science and Technology. 2006, 40:3148-3155
Aerosol Science. 2001, 32:1213-1223
Environmental Science Journal. 2006, 18(1):90-95

For most of the metals and alloys, the flow stress increases with the increase of strain rate, exhibiting the strain rate strengthening effect, while some materials exhibit strain rate weakening effect [4].
The split Hopkinson bar apparatus is widely used in testing the dynamic mechanical characteristics of materials.
This phenomenon is consistent with the conventional metal materials due to its strain rate strengthening effect.
Plastic Engineering Journal, 2010, 16(5): 125-129
[5] Bing Shang, Shi-sheng Hu, Xi-quan Jiang, The three waves checking method of processing SHPB testing data on metal materials, J.

Citation & Copyright (to be inserted by the publisher ) Tensile Deformation and Fracture Behavior of a Commercial Al Alloy with Nano-Sized Grains Si-Young Chang 1� , Sang-Ho Seo1, Seong-Hee Lee 2, Chang-Seog Kang 3, Sung-Kil Hong 4 and Dong Hyuk Shin5 1 Dept. of Materials Engineering, Hankuk Aviation University, Koyang, Kyunggi-do 412-791, Korea 1 *Graduate Student, Hankuk Aviation University, Koyang, Kyunggi-do 412-791, Korea 2 Division of Advanced Materials Science and Engineering, Mokpo National University, Mokpo 534-729, Korea 3 Materials & Components R&D Team, Korea Institute of Industrial Technology, Kwangu-Jonnam Technopark 500-470, Korea 4 Dept. of Metallurgical Engineering, Chonnam National University, Kwangju 500-757, Korea 5 Dept. of Metallurgy and Materials Science, Hanyang University, Ansan, Kyunggi-do 425-791, Korea Keywords: equal channel angular pressing, 5083 Al alloy, nano-structure, fracture surface Abstract.
However, nano-structured metallic materials often exhibit low tensile ductility at room temperature, which limits their practical application.
Therefore, it is important to attain to at least the elongation comparable to that of conventional coarse-grained metallic materials, with satisfying strength, in the nano-structured metallic materials.
Cylindrical samples of �18 mm×130 mm were prepared from the extruded bar, as stating materials for ECAP, followed by the annealing treatment at 723 K for 1h.
The starting materials showed the average grain size of approximately 200 �.