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of fracture surface for the tensile specimen at room temperature shows a dimple-ductile fracture mode. The fractograph from 600 to 800 ℃ shows a slide fracture mode. The fractograph from 900 to 1 100... The fracture is planar macroscopically, the separation angle of fracture surface with tensile axis equals 90?. There are large numbers of dimples in the fracture, which are in the similar dimension......
Institute of Technology, Harbin 150001, China Received 17 June 2010; accepted 15 August 2010 Abstract: The effect of interface reaction on the fractal dimensions of fracture surface in aluminum... properties and fractal dimension with measuring units of 3-15 μm. The results show that the ultimate tensile strength increases while the fracture surface roughness increases with fractal dimension increasing......
J. Cent. South Univ. Technol. (2008) 15(s1): 374-380 DOI: 10.1007/s11771-008-383-2 Rheological characteristics of soft rock structural surface CHEN Yuan-jiang(陈沅江)1, 2, WU Chao(吴 超)1, FU Yi...: There are two mechanisms of the coarse surface asperity resistance effect and rubbing resistance effect in the course of the soft rock structural surface creep, of which the former plays a dominant......
The Morphology of Rolling Contact Fatigue Fracture of Hardened Steels王绪,章守华,崔佩庸摘 要:<正> Rolling Contact Fatigue(RCF) is a cumulativedamage phenomenon when metals are subjectedto repeated contact stresses. The fomationof pitting on the contact surface is the resultof the rolling contact fatigue. The morphologiesof rolling contact fatigue fracture......
Surface Yielding of Metals by X-ray DiffractionXiuying GAI Jiabao LI Zengqiao KANG State Key Lab.for Fatigue and Fracture of Materials,Institute of Metal Research,Academia Sinica,Shenyang,110015,ChinaJiawen HE Xi’an Jiaotong University,Xi’an,710049,China摘 要:<正> Surface yielding of metallic material was measured with strain gage and X-ray......
after LN2 thermal shocking treatments. LN2 thermal shocking leads to a denser fracture network than its original state with coal porosity growth rate increasing up to 183.3%. The surface porosity... progressive scratch layers, fracture variation diversity (i.e. extension, propagation, connectivity, irregularity) on the surface of the coal block and these were the main reasons leading......
at 1 380 ℃. Key words: Mo-Ti-Zr alloy rods; rotary forging; relative density; fracture surface morphology  ... rotary forging to deformation amount of 33% at 1 250 ℃. The increase of relative density of Mo-Ti-Zr alloy rods reaches the lowest after rotary forging to deformation amount of 19.2%. The fracture type......
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Improvement of Fracture Toughness Lanthanum Zirconate DAI H1,CAO X Q1,LI Q1,LI J Y1,ZHONG X H1 (1.Key Lab of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese... temperature applications. The fracture toughness and microhardness of nanocrystalline LZ (n-LZ), microcrystalline LZ (m-LZ) and LZ-5mol%8YSZ (LZ-5-8YSZ) composite (8YSZ for zirconia stabilized by 8 mol......
and Astronautics, Nanjing 210016, China) Abstract: The 3D fracture field distribution model of goaf and overlying strata was derived on the basis of the continuous surface mathematical model of overlying... in the internal range. Key words: goaf; overlying strata; continuous surface model; 3D fracture field; porosity 随着煤炭开采强度的日益加深,采空区遗煤自燃,瓦斯涌出以及煤与瓦斯共存条件下的耦合灾害对井下安全生产的危害愈加突出,因此掌握采空区火与瓦斯的热质传递规律以及防灭火介质的流动特性对防治采空区火与瓦斯灾害显得尤......