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Mostafa FAKHARIFAR,Ahmad DALVAND,Mohammad K. SHARBATDAR,Genda CHEN,Lesley SNEED
《结构与土木工程前沿(英文)》 2016年 第10卷 第1期 页码 44-62 doi: 10.1007/s11709-015-0295-9
关键词: FRP ductility confinement seismic shear
Ductility loss of hydrogen-charged and releasing 304L steel
Yanfei WANG, Jianming GONG, Yong JIANG, Wenchun JIANG, Wang JIANG
《机械工程前沿(英文)》 2013年 第8卷 第3期 页码 298-304 doi: 10.1007/s11465-013-0265-7
The mechanical properties and fracture behavior of 304L austenitic stainless steel after cathodic hydrogen charging and hydrogen spontaneously releasing are investigated by tensile tests. Flat tensile specimens were cathodic hydrogen charged at various current densities. For each density, two specimens were charged at the same condition. When the charging process completed, one specimen was tensile immediately to fracture and the other was aged to release the hydrogen out of it and then was also tensile to fracture. The resulting tensile properties and micrographs of fracture surfaces of these specimens were evaluated and compared. The results show ductility loss occurred in the hydrogen-charged specimens and the loss increased as the current density increasing. After hydrogen releasing, the specimens recovered a certain extent but not all of its original ductility. Scanning electron microscope (SEM) micrographs of fracture surfaces reveal that irreversible damage had developed in the hydrogen-releasing specimens during the releasing process rather than the charging process. This consequence can be ascribed to the high tensile stress caused by non-uniform hydrogen distribution during hydrogen releasing.
关键词: hydrogen embrittlement ductility loss hydrogen releasing control strategy 304L austenitic stainless steel
Ductility improvement of GFRP-RC beams using precast confined concrete block in compression zone
《结构与土木工程前沿(英文)》 2023年 第17卷 第10期 页码 1585-1598 doi: 10.1007/s11709-023-0968-8
关键词: ductility four-point bending test glass fiber-reinforced polymer precast confined concrete block
通过深冷轧制和短时低温退火实现纯镍的高强度和拉伸延展性 Article
Zhide Li, Hao Gu, Kaiguang Luo, Charlie Kong, Hailiang Yu
《工程(英文)》 2024年 第33卷 第2期 页码 190-203 doi: 10.1016/j.eng.2023.01.019
Ultrafine-grained pure metals and their alloys have high strength and low ductility. In this study, cryorolling under different strains followed by low-temperature short-time annealing was used to fabricate pure nickel sheets combining high strength with good ductility. The results show that, for different cryorolling strains, the uniform elongation was greatly increased without sacrificing the strength after annealing. A yield strength of 607 MPa and a uniform elongation of 11.7% were obtained after annealing at a small cryorolling strain (ε = 0.22), while annealing at a large cryorolling strain (ε = 1.6) resulted in a yield strength of 990 MPa and a uniform elongation of 6.4%. X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and electron backscattered diffraction (EBSD) were used to characterize the microstructure of the specimens and showed that the high strength could be attributed to strain hardening during cryorolling, with an additional contribution from grain refinement and the formation of dislocation walls. The high ductility could be attributed to annealing twins and micro-shear bands during stretching, which improved the strain hardening capacity. The results show that the synergistic effect of strength and ductility can be regulated through lowtemperature short-time annealing with different cryorolling strains, which provides a new reference for the design of future thermo-mechanical processes.
关键词: Cryorolling Annealing Nickel Strain hardening Ductility
Performance of a novel bent-up bars system not interacting with concrete
Aydin SHISHEGARAN, Mohammad Reza GHASEMI, Hesam VARAEE
《结构与土木工程前沿(英文)》 2019年 第13卷 第6期 页码 1301-1315 doi: 10.1007/s11709-019-0552-4
关键词: bending capacity rubber tube stress transfer bent-up bars ductility cracking
Modeling of semi-rigid beam-to-column steel joints under extreme loading
C FANG, B A IZZUDDIN, A Y ELGHAZOULI, D A NETHERCOT
《结构与土木工程前沿(英文)》 2013年 第7卷 第3期 页码 245-263 doi: 10.1007/s11709-013-0215-9
关键词: semi-rigid joint component method ductility elevated temperature
Mounir Ait BELKACEM, Hakim BECHTOULA, Nouredine BOURAHLA, Adel Ait BELKACEM
《结构与土木工程前沿(英文)》 2019年 第13卷 第4期 页码 831-851 doi: 10.1007/s11709-018-0513-3
关键词: reinforced concrete columns axial load transverse reinforcement ductility
Dynamic analyses of steel-reinforced super high-strength concrete columns
JIA Jinqing, JIANG Rui, XU Shilang, HOU Tong
《结构与土木工程前沿(英文)》 2007年 第1卷 第2期 页码 240-246 doi: 10.1007/s11709-007-0030-2
关键词: amendment flexural-shear force-displacement hysteretic definite ductility skeleton
Flexural behavior of ECC hollow beams incorporating different synthetic fibers
Ahmmad A. ABBAS, Farid H. ARNA ’OT, Sallal R. ABID, Mustafa ÖZAKÇA
《结构与土木工程前沿(英文)》 2021年 第15卷 第2期 页码 399-411 doi: 10.1007/s11709-021-0701-4
关键词: hollow beam hollowing ratio ECC flexural strength ductility toughness
冯远,易丹,毕琼
《中国工程科学》 2009年 第11卷 第6期 页码 138-145
针对大开间少墙砌体结构的受力特点,结合教学楼震害,分析了构造柱、圈梁对砌体结构抗震性能的影响,并对提高结构延性的设计理念进行了阐述;同时对大开间少墙单面走廊砌体结构的设计提出了几点建议。
关键词: 大开间少墙单面走廊砌体结构 构造柱 圈梁 延性 窗间墙
方志,唐盛华,何鑫
《中国工程科学》 2012年 第14卷 第10期 页码 73-81
对一片30 m跨的预应力混凝土小箱梁和一片20 m跨的预应力混凝土空心板进行了足尺模型试验,破坏模式分别为预应力筋拉断和顶板混凝土压碎,按能量的观点计算的延性指标小箱梁和空心板分别为1.99和1.23。基于平截面假定,采用有限条带法编制了非线性计算程序,可对包括卸载过程在内的全过程受力性能进行分析。重点介绍了卸载曲线如何在应力-应变、弯矩-曲率及荷载-位移3个层面进行计算。通过程序,对预应力筋配筋量、预应力筋张拉系数对结构的承载力、变形性能及延性的影响进行了分析。
标题 作者 时间 类型 操作
reinforcement constituting conventional longitudinal steel and FRP stirrups for improved seismic strength and ductility
Mostafa FAKHARIFAR,Ahmad DALVAND,Mohammad K. SHARBATDAR,Genda CHEN,Lesley SNEED
期刊论文
Ductility loss of hydrogen-charged and releasing 304L steel
Yanfei WANG, Jianming GONG, Yong JIANG, Wenchun JIANG, Wang JIANG
期刊论文
Ductility improvement of GFRP-RC beams using precast confined concrete block in compression zone
期刊论文
Performance of a novel bent-up bars system not interacting with concrete
Aydin SHISHEGARAN, Mohammad Reza GHASEMI, Hesam VARAEE
期刊论文
Modeling of semi-rigid beam-to-column steel joints under extreme loading
C FANG, B A IZZUDDIN, A Y ELGHAZOULI, D A NETHERCOT
期刊论文
Effect of axial load and transverse reinforcements on the seismic performance of reinforced concrete columns
Mounir Ait BELKACEM, Hakim BECHTOULA, Nouredine BOURAHLA, Adel Ait BELKACEM
期刊论文
Dynamic analyses of steel-reinforced super high-strength concrete columns
JIA Jinqing, JIANG Rui, XU Shilang, HOU Tong
期刊论文
Flexural behavior of ECC hollow beams incorporating different synthetic fibers
Ahmmad A. ABBAS, Farid H. ARNA ’OT, Sallal R. ABID, Mustafa ÖZAKÇA
期刊论文