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• Influence of grain size on the small fatigue crack initiation and propagation behaviors of a nickel-based superalloy at 650℃

  来源： 《JOURNAL OF MATERIALS SCIENCE TECHNOLOG2019年第8期》——Xumin Zhu Congyang Gong Yun-Fei Jia Runzi Wang Chengcheng Zhang Yao Fu Shan-Tung Tu Xian-Cheng Zhang

  by using single edge notch tensile specimens. The number of main cracks and crack initiation mechanisms at the notch surface strongly depended on the grain size. The crack initiation life accounted......

• 基于扩孔理论的混凝土钢筋锈胀开裂分析

  来源： 《中南大学学报(自然科学版)2010年第3期》——唐孟雄 陈晓斌

  was analyzed with cylindrical cavity expansion theory, and animation model was set up for this cover cracking process. By the animation model, the radius and pressing stress analytic equations... of Chlorides or carbonization aggression. Key words: cylindrical cavity expansion theory; plastic zone radius; rebar corrosion expansion crack; critical rebar corrosion ratio; service life forecast 钢筋锈蚀膨胀是......

• Effect of Strain Rate on the Mechanical Properties of Ti-24Al-11Nb

  来源： 《JOURNAL OF MATERIALS SCIENCE TECHNOLOG1993年第3期》——Guoliang CHEN Yandong WANG Wangyue YANG Zhuqing SUN Runrong REN Dept.of Materials Science and Engineering,Beijing University of Science and Technology,Beijing,,ChinaShijie ZHU Suhua AI Lab.of Fatigue and Fracture for Materials,Institute of Metal Research Academia Sinica,Shenyang,,China

  ="ChDivSummary"><正> The effect of strain rate on the bend ductility and notch fracture toughness of Ti-24Al-11 Nb wasstudied,it was found that the strain rate with a range of 1.17×10-5~1.17 ×10-3......

• Elevated temperature endurance and creep properties of extruded 2D70 Al alloy rods

  来源： 《Rare Metals2011年第3期》——WANG Guojuna, b, XIONG Baiqinga, ZHANG Yong’ana, and LI Zhihuia a State Key Laboratory of Nonferrous Metals and Processes, General Research Institute for Nonferrous Metals, Beijing , China b Northeast Light Alloy Co. Ltd., Harbin , China

  that, as the test temperature increases, the elevated temperature enduring strength of 2D70 Al alloy decreases gradually. In a comparison between 150 C and 240 C, the notch enduring strength drops from 375 to 185 MPa and the smooth enduring strength drops from 337 to 130 MPa. Enduring strength is not sensitive to the notch. The notch sensitivity ratio (NSR) coefficient is in the range of 1.119 to 1.423 from 150 C......

• 高温保持对Inconel 718合金缺口敏感性的影响

  来源： 《材料工程2003年增刊第1期》——陈宗霖 孙贵东 姚枚 蔡大勇 张伟红 刘文昌 姜涛

  高温保持对Inconel 718合金缺口敏感性的影响 陈宗霖1,孙贵东1,姚枚2,蔡大勇2,张伟红2,刘文昌2,姜涛3 (1.黎明航发集团公司,沈阳,110043;2.燕山大学材料科学与工程学院,秦皇岛,066004;3.北京航空材料研究院,北京,100095) 摘要:研究了Inconel 718合金经980℃,1000℃及1020℃不同时间保温处理后,其缺口敏感性的变化规律,并采用扫描电镜(SEM)对拉伸断口及显微组织进行了分析.结果发现,经固溶,δ相时效,高温保持及双时效处理的Inconel718合金,980℃保温1h,6h时合金无缺口敏感性,但持久寿命较低;1000℃保温1h,3h......

• 灰铸铁的切口强度与切口敏感性

  来源： 《机械工程材料2003年第2期》——王泓 郑修麟 鄢君辉

  灰铸铁的切口强度与切口敏感性 王泓1,郑修麟1,鄢君辉1 (1.西北工业大学材料科学与工程学院,陕西,西安,710072) 摘要:总结了国产灰铸铁的抗拉强度与抗拉切口强度,抗弯强度与抗弯切口强度的试验研究结果.结果表明,不论在拉伸或弯曲载荷下,灰铸铁的切口强度约等于其抗拉强度或抗弯强度,与试件应力集中系数Kt无关.这表明灰铸铁的切口强度比,即切口强度对断裂强度之比(NSR)等于1.0,亦即灰铸铁对切口不敏感.结合灰铸铁的显微组织,简要分析了对切口不敏感的原因. 关键词:灰铸铁; 强度; 切口强度; 切口敏感性; [全文内容正在添加中] ......

• 新型体全息窄带滤光器的光学特性研究

  来源： 《功能材料与器件学报2004年第1期》——欧阳艳东 黄翀 林旭升

  新型体全息窄带滤光器的光学特性研究 欧阳艳东1,黄翀1,林旭升1 (1.汕头大学,物理系,广东,汕头,515063) 摘要:用紫外/可见分光光度计测定由DCG记录的透射式体全息窄带带阻滤光器的光谱特性,分析其滤波特性.测量结果分析表明,滤光器有较窄的带宽,其半宽度小于13nm,1/10宽度小于19nm.在400-800nm可见光区域,对其主谱线的相对透过率小于2%,其它谱线的相对透过率大于85%.对半导体泵浦激光器主谱线532.0nm有优良的滤光特性. 关键词:窄带滤光器; 全息; 光学特性; [全文内容正在添加中] ......

• Enhancing strength and plasticity by pre-introduced indent-notches in Zr₃₆Cu₆₄metallic glass: A molecular dynamics simulation study

  来源： 《JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第8期》——Shidong Feng Lin Li K.C.Chan Lei Zhao Limin Wang Riping Liu

  composed of solid-like atoms in the indent-notch affected zone. These denselypacked clusters are highly resistant to the nucleation of shear bands. Hence, there is more tendency for the shear bands to nucleate outside the indent-notch affected zone, which enlarges the deformation region and enhances both the strengthening effect and the plastic deformation ability. For indent-notched MGs, when......

• Crack growth behavior of SRR99 single crystal superalloy under thermal fatigue

  来源： 《Rare Metals2008年第5期》——LIU Yuan a, b, YU Jinjiang a, XU Yan a, SUN Xiaofeng a, GUAN Hengrong a, and HU Zhuangqi a a Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China b Graduate School of Chinese Academy of Sciences, Beijing , China

  of a single crystal superalloy SRR99 was investigated. Specimens with V-type notch were tested at the peak temperatures of 900, 1000, and 1100°C. The crack growth curves as a function of the number..., it was found that multiple small cracks nucleated at the notch tip region but only one or two of them continued to develop in the following thermal cycles. The primary cracks generally propagated......

• Microstructure Dependent Fatigue Cracking Resistance of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si Alloy

  来源： 《JOURNAL OF MATERIALS SCIENCE TECHNOLOG2012年第7期》——Z.M.Song ),L.M.Lei ,),B.Zhang ),X.Huang ) and G.P.Zhang ) ) Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang ,China ) AVIC Commercial Aircraft Engine Co.,Ltd.,Shanghai ,China ) Titanium Alloys Laboratory,Beijing Institute of Aeronautical Materials,Beijing ,China ) Key Laboratory for Anisotropy and Texture of Materials of Ministry of Education,School of Materials and Metallurgy,Northeastern University,Shenyang ,China

  110819,China摘 要:Fatigue cracking behavior from a notch was investigated at room temperature for Ti-6.5Al-3.5Mo-1.5Zr-0.3Si(TC11) alloys with four different... a higher fatigue crack initiation threshold from the notch,while the bimodal structure with coarse α grain had a lower fatigue cracking resistance.The alloy with α/β lamellar structure showed a higher......