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《结构与土木工程前沿(英文)》 页码 1341-1356 doi: 10.1007/s11709-023-0988-4
关键词: steel fiber reinforced concrete freeze–thaw cycling Brazilian disc splitting test acoustic emission technique dynamic splitting tensile acoustic emission properties
QI Dongming, SHAO Jianzhong, WU Minghua, NITTA Kohhei
《化学科学与工程前沿(英文)》 2008年 第2卷 第4期 页码 396-401 doi: 10.1007/s11705-008-0077-1
关键词: maximal uniaxial tensile unfilled excellent tensile influence
Biranchi PANDA,A. GARG,Zhang JIAN,Akbar HEIDARZADEH,Liang GAO
《机械工程前沿(英文)》 2016年 第11卷 第3期 页码 289-298 doi: 10.1007/s11465-016-0393-y
Friction stir welding (FSW) process has gained attention in recent years because of its advantages over the conventional fusion welding process. These advantages include the absence of heat formation in the affected zone and the absence of large distortion, porosity, oxidation, and cracking. Experimental investigations are necessary to understand the physical behavior that causes the high tensile strength of welded joints of different metals and alloys. Existing literature indicates that tensile properties exhibit strong dependence on the rotational speed, traverse speed, and axial force of the tool that was used. Therefore, this study introduces the experimental procedure for measuring tensile properties, namely, ultimate tensile strength (UTS) and tensile elongation of the welded AA 7020 Al alloy. Experimental findings suggest that a welded part with high UTS can be achieved at a lower heat input compared with the high heat input condition. A numerical approach based on genetic programming is employed to produce the functional relationships between tensile properties and the three inputs (rotational speed, traverse speed, and axial force) of the FSW process. The formulated models were validated based on the experimental data, using the statistical metrics. The effect of the three inputs on the tensile properties was investigated using 2D and 3D analyses. A high UTS was achieved, including a rotational speed of 1050 r/min and traverse speed of 95 mm/min. The results also indicate that 8 kN axial force should be set prior to the FSW process.
关键词: tensile properties ultimate tensile strength tensile elongation friction stir welding tool rotational speed genetic programming welding speed
Experimental investigation on mechanical properties of binary and ternary blended pervious concrete
Rekha SINGH, Sanjay GOEL
《结构与土木工程前沿(英文)》 2020年 第14卷 第1期 页码 229-240 doi: 10.1007/s11709-019-0597-4
关键词: mineral admixture ternary compressive strength split tensile strength pervious concrete ultrasonic pulse velocity
Lianzhong ZHANG, Dichen LI, Shenping YAN, Ruidong XIE, Hongliang QU
《机械工程前沿(英文)》 2018年 第13卷 第4期 页码 513-519 doi: 10.1007/s11465-018-0503-0
The mechanical properties of 316L stainless steel repaired with Fe314 under different temperatures and humidities without inert gas protection were studied. Results indicated favorable compatibility between Fe314 and 316L stainless steel. The average yield strength, tensile strength, and sectional contraction percentage were higher in repaired samples than in 316L stainless steel, whereas the elongation rate was slightly lower. The different conditions of humiture environment on the repair sample exerted minimal influence on tensile and yield strengths. The Fe314 cladding layer was mainly composed of equiaxed grains and mixed with randomly oriented columnar crystal and tiny pores or impurities in the tissue. Results indicated that the hardness value of Fe314 cladding layer under different humiture environments ranged within 419–451.1 HV0.2. The field humiture environment also showed minimal impact on the average hardness of Fe314 cladding layers. Furthermore, 316L stainless steel can be repaired through laser cladding by using Fe314 powder without inert gas protection under different temperatures and humidity environments.
关键词: laser cladding repaired performance tensile strength temperature and humidity environment
Hakan T TURKER
《结构与土木工程前沿(英文)》 2022年 第16卷 第8期 页码 1017-1028 doi: 10.1007/s11709-022-0871-8
关键词: testing apparatus & methods plain concrete tensile properties biaxial flexural strength triangular plate method
《结构与土木工程前沿(英文)》 页码 1228-1248 doi: 10.1007/s11709-023-0931-8
关键词: UHPC MT-DIC flexural behavior tensile behavior steel fiber polypropylene fiber
Dammika P. K. WELLALA, Ashish Kumer SAHA, Prabir Kumar SARKER, Vinod RAJAYOGAN
《结构与土木工程前沿(英文)》 2021年 第15卷 第1期 页码 124-135 doi: 10.1007/s11709-020-0673-9
关键词: fine crushed aggregates quarry dust compressive strength splitting tensile strength drying shrinkage
An artificial neural network model on tensile behavior of hybrid steel-PVA fiber reinforced concrete
Fangyu LIU, Wenqi DING, Yafei QIAO, Linbing WANG
《结构与土木工程前沿(英文)》 2020年 第14卷 第6期 页码 1299-1315 doi: 10.1007/s11709-020-0712-6
关键词: artificial neural network hybrid fiber reinforced concrete tensile behavior sensitivity analysis stress-strain curve
杨黎明,周风华,董新龙,王礼立
《中国工程科学》 2011年 第13卷 第3期 页码 29-37
在爆炸载荷下,反射拉应力波是导致混凝土防护结构震塌的主要原因。材料的动态抗拉强度是结构抗爆防震塌设计所必须考虑的主要参量,抑制或减弱拉伸冲击波的强度是防护结构设计的一个重要目标。研究了混凝土和钢纤维增强混凝土的动态力学性能以及它们结构的爆炸震塌响应。试验表明,高强混凝土C100的抗震塌能力还不如普通混凝土C40;加入体积含量2 %的钢纤维可有效提高混凝土的强度以及结构的抗震塌能力;而且加入相同含量的钢纤维后,纤维增强C100混凝土的抗震塌能力与增强C40混凝土相比并无明显不同。应用一维应力波理论近似分析,揭示了抗震塌设计的动力学机理,分析表明,“三明治”复合层结构可以有效提高结构的抗震塌能力,此分析为设计具有更好抗爆能力的防护工程提供了科学依据。
Morphological and mechanical characterization of a PMMA/CdS nanocomposite
Vishal MATHUR, Manasvi DIXIT, K.S. RATHORE, N. S. SAXENA, K.B. SHARMA
《化学科学与工程前沿(英文)》 2011年 第5卷 第2期 页码 258-263 doi: 10.1007/s11705-010-1014-7
关键词: poly(methyl methacrylate) (PMMA) filler nanoparticles polymer semiconducting nanocomposite tensile properties glass transition temperature
考虑垫片形状和尺寸效应的珊瑚混凝土劈裂抗拉性能的三维细观研究 Article
吴彰钰, 张锦华, 余红发, 方秦, 麻海燕, 陈力
《工程(英文)》 2022年 第17卷 第10期 页码 110-122 doi: 10.1016/j.eng.2021.02.024
珊瑚混凝土(CAC)作为一种新型建筑材料,已经在岛礁工程结构建设领域引起了极大的关注。为了研究CAC的静态劈裂抗拉性能,本文提出了一种考虑骨料形状和空间分布随机性的三维(3D)随机混凝土细观模型,影响因素包括试件形状和支承垫片尺寸。我们建立了12 个不同的混凝土细观模型,按照试件形状可分为两种,即边长为150 mm的立方体和尺寸为ϕ150 mm×300 mm的圆柱体。其中,支承垫片宽度为6 mm、9 mm、12 mm、15 mm、18 mm和20 mm。本文系统分析和讨论了试件几何形状和垫片宽度对CAC劈裂抗拉性能的影响规律,研究内容包括混凝土开裂过程、最终破坏模式和劈裂抗拉强度(fst)。结果表明:本文所开发的细观模型具有很高的可靠性,并确定了适用于CAC劈裂抗拉性能模拟和预测的最优计算参数。CAC的fst值与试件形状和垫片宽度直接相关。其中,在垫片尺寸相同的情况下,立方体CAC试件的fst值要略高于圆柱体模型,表明可以采用断裂面积的差异来解释试件形状效应对CAC fst值的影响规律。此外,当垫片的相对宽度由0.04 增加到0.13 时,CAC的fst值会呈现逐渐增大的趋势。基于弹性力学理论,本文初步确定了不同垫片宽度条件下CAC fst的取值范围,这对于研究CAC的抗拉性能具有重要意义。
Biaxial tensile-compressive experiment of concrete at high temperatures
SONG Yupu, ZHANG Zhong, QING Likun, YU Changjiang
《结构与土木工程前沿(英文)》 2007年 第1卷 第1期 页码 94-98 doi: 10.1007/s11709-007-0009-z
关键词: increase Offshore Engineering temperature relationship addition
Tensile ratcheting behaviors of bronze powder filled polytetrafluoroethylene
Wenjuan XU, Hong GAO, LiLan GAO, Xu CHEN, Yong WANG
《化学科学与工程前沿(英文)》 2013年 第7卷 第1期 页码 103-109 doi: 10.1007/s11705-013-1315-8
关键词: bronze filled polytetrafluoroethylene (PTFE/bronze) uniaxial tensile behavior ratcheting behavior dissipation strain energy density (DSED)
Multiscale mechanical modeling of hydrated cement paste under tensile load using the combined DEM-MD
Yue HOU, Linbing WANG
《结构与土木工程前沿(英文)》 2017年 第11卷 第3期 页码 270-278 doi: 10.1007/s11709-017-0408-8
标题 作者 时间 类型 操作
Acoustic emissions evaluation of the dynamic splitting tensile properties of steel fiber reinforced concrete
期刊论文
Characterization of the tensile properties of friction stir welded aluminum alloy joints based on axial
Biranchi PANDA,A. GARG,Zhang JIAN,Akbar HEIDARZADEH,Liang GAO
期刊论文
Experimental investigation on mechanical properties of binary and ternary blended pervious concrete
Rekha SINGH, Sanjay GOEL
期刊论文
Influence of the field humiture environment on the mechanical properties of 316L stainless steel repaired
Lianzhong ZHANG, Dichen LI, Shenping YAN, Ruidong XIE, Hongliang QU
期刊论文
Effect of size on biaxial flexural strength for cement-based materials by using a triangular plate method
Hakan T TURKER
期刊论文
Exploring the mechanical properties of steel- and polypropylene-reinforced ultra-high-performance concrete
期刊论文
Fresh and hardened properties of high-strength concrete incorporating byproduct fine crushed aggregate
Dammika P. K. WELLALA, Ashish Kumer SAHA, Prabir Kumar SARKER, Vinod RAJAYOGAN
期刊论文
An artificial neural network model on tensile behavior of hybrid steel-PVA fiber reinforced concrete
Fangyu LIU, Wenqi DING, Yafei QIAO, Linbing WANG
期刊论文
Morphological and mechanical characterization of a PMMA/CdS nanocomposite
Vishal MATHUR, Manasvi DIXIT, K.S. RATHORE, N. S. SAXENA, K.B. SHARMA
期刊论文
Biaxial tensile-compressive experiment of concrete at high temperatures
SONG Yupu, ZHANG Zhong, QING Likun, YU Changjiang
期刊论文
Tensile ratcheting behaviors of bronze powder filled polytetrafluoroethylene
Wenjuan XU, Hong GAO, LiLan GAO, Xu CHEN, Yong WANG
期刊论文