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王国体
《中国工程科学》 2006年 第8卷 第12期 页码 80-84
土坡的稳定分析一直是沿着条分法的思路发展的。由于对土体应力状态条件的忽视和条分法本身的缺陷,使得条分法得到的安全系数在工程中的应用面临激烈的挑战。土体不同条件下的应力状态表现为K0效应和变化,它对坡体的安全度影响不可忽视。笔者以考虑土体应力状态为条件,应用土的库伦强度定律和摩尔-库伦准则,推导出平面土坡的安全系数计算公式,与条分法的安全系数对比结果说明这种方法具有概念明确、计算简便、定性可靠的重要特点,可以直接提供于工程应用和参考。
王国体,王婉娣
《中国工程科学》 2010年 第12卷 第1期 页码 52-55
依据土体应力状态、计算边坡稳定安全系数的思想,结合对土体根本性质的认识,对基本假定、公式推导过程和工程应用进行了详细的说明。由于土坡稳定安全系数的计算公式在理论分析依据是严密的,推证得到的计算公式是正确的,所以在工程实用是可靠的。文章为该方法的工程应用和深入开展相关的研究奠定坚实的基础。
Mehdi VEISKARAMI, Ali GHORBANI, Mohammadreza ALAVIPOUR
《结构与土木工程前沿(英文)》 2012年 第6卷 第4期 页码 365-378 doi: 10.1007/s11709-012-0178-2
关键词: constitutive model granular material rockfill plasticity disturbed state concept stress level
Hot-dip galvanizing of cold-formed steel hollow sections: a state-of-the-art review
Min SUN, Jeffrey A. PACKER
《结构与土木工程前沿(英文)》 2019年 第13卷 第1期 页码 49-65 doi: 10.1007/s11709-017-0448-0
关键词: cold-formed steel hollow structural sections hot-dip galvanizing embrittlement heat-treatment residual stress cracking
Surficial stability analysis of soil slope under seepage based on a novel failure mode
《结构与土木工程前沿(英文)》 2021年 第15卷 第3期 页码 712-726 doi: 10.1007/s11709-021-0729-5
关键词: soil slope seepage surficial failure mode stress state edge effects
Stress induced polarization switching and coupled hysteretic dynamics in ferroelectric materials
Linxiang WANG, Roderick MELNIK, Fuzai LV
《机械工程前沿(英文)》 2011年 第6卷 第3期 页码 287-291 doi: 10.1007/s11465-011-0230-2
The dynamic responses of ferroelectric materials upon external mechanical and electrical stimulations are inherently nonlinear and coupled. In the current paper, a macroscopic differential model is constructed for the coupled hysteretic dynamics via modeling the orientation switching induced in the materials. A non-convex potential energy is constructed with both mechanic and electric field contributions. The governing equations are formulated as nonlinear ordinary differential equations by employing the Euler-Lagrange equation, and can be easily recast into a state space form. Hysteresis loops associated with stress induced polarization switching and butterfly-shaped behavior in ferroelectric materials are also successfully captured. The effects of mechanical loadings on the electrically induced switching are numerically investigated, as well as the mechanically-induced switching with various bias electric fields.
关键词: differential model state space electromechanical switching butterfly effects hysteresis
刘大斌,韩文坝,蔡冰清,韩晓东
《中国工程科学》 2007年 第9卷 第12期 页码 44-52
闫东明,林皋
《中国工程科学》 2007年 第9卷 第6期 页码 64-70
对设计强度为10MPa的混凝土立方体试件进行三轴压缩试验,系统研究了等围压条件下混凝土的强 度和变形特性,围压分别为0,4,8,12,16MPa5个量级;同时研究了不等围压条件下混凝土强度变化特性, 试验表明,随着围压增加,混凝土的极限抗压强度有明显增强的趋势;随着小主应力的增加,中主应力的影响 有减弱的趋势;峰值应力处应变随围压增加幅度显著。得出了在不同恒定围压下混凝土的应力应变全过程曲线; 通过与当前文献资料的对比分析,指出了在混凝土结构计算中适用的强度及变形表达式,为工程实践提供了 依据。
复杂曲面薄壁构件流体压力成形理论与技术研究进展 Review
苑世剑
《工程(英文)》 2021年 第7卷 第3期 页码 358-366 doi: 10.1016/j.eng.2020.08.014
面向航空航天、汽车和高速列车等工业领域迫切需求的管、板和壳三类典型结构以及难变形材料构件,新一代流体压力成形技术得到迅速发展。本文系统介绍了管类构件低载荷液压成形、板类构件双向加压成形、椭球壳体无模液压成形和难变形材料双调热介质成形理论与工艺的最新研究进展,重点阐述了变形行为、应力调控、缺陷控制和典型应用。此外,本文还展望了流体压力成形技术的未来发展方向,包括超大尺度非均质构件超低载荷成形、金属间化合物和高熵合金构件精密成形、智能化流体压力成形工艺与装备,以及非均质强各向异性薄壳的精确有限元仿真。
EFFECTS OF TRANSPORT STRESS ON THE INTESTINES INVOLVING NEURONAL NITRIC OXIDE SYNTHASE
《农业科学与工程前沿(英文)》 页码 285-295 doi: 10.15302/J-FASE-2022469
● Transport stress declined the level of leukocytes including lymphocytes in rat serum.
Advances in tissue state recognition in spinal surgery: a review
Hao Qu, Yu Zhao
《医学前沿(英文)》 2021年 第15卷 第4期 页码 575-584 doi: 10.1007/s11684-020-0816-3
关键词: spinal surgery tissue state recognition image force sensing bioelectrical impedance
Effectiveness of state incentives for promoting wind energy: A panel data examination
Deepak SANGROYA,Jogendra NAYAK
《能源前沿(英文)》 2015年 第9卷 第3期 页码 247-258 doi: 10.1007/s11708-015-0364-8
关键词: India wind energy development state incentives econometric analysis panel data
Analysis on annealing-induced stress of blind-via TSV using FEM
Jie SHAO, Tielin SHI, Li DU, Lei SU, Xiangning LU, Guanglan LIAO
《机械工程前沿(英文)》 2018年 第13卷 第3期 页码 401-410 doi: 10.1007/s11465-017-0457-7
Copper-filled through silicon via (TSV) is a promising material owing to its application in high-density three-dimensional (3D) packaging. However, in TSV manufacturing, thermo-mechanical stress is induced during the annealing process, often causing reliability issues. In this paper, the finite element method is employed to investigate the impacts of via shape and SiO2 liner uniformity on the thermo-mechanical properties of copper-filled blind-via TSV after annealing. Top interface stress analysis on the TSV structure shows that the curvature of via openings releases stress concentration that leads to ~60 MPa decrease of normal stresses, sxx and syy, in copper and ~70 MPa decrease sxx of in silicon. Meanwhile, the vertical interface analysis shows that annealing-induced stress at the SiO2/Si interface depends heavily on SiO2 uniformity. By increasing the thickness of SiO2 linear, the stress at the vertical interface can be significantly reduced. Thus, process optimization to reduce the annealing-induced stress becomes feasible. The results of this study help us gain a better understanding of the thermo-mechanical behavior of the annealed TSV in 3D packaging.
关键词: through silicon via (TSV) annealing-induced stress interface stress plastic deformation finite element method
An investigation on stress distribution effect on multi- piezoelectric energy harvesters
Hailu YANG, Dongwei CAO
《结构与土木工程前沿(英文)》 2017年 第11卷 第3期 页码 301-307 doi: 10.1007/s11709-017-0404-z
关键词: piezoelectric transducer uneven stress impedance matching optimal energy output
The formation mechanism and the influence factor of residual stress in machining
null
《机械工程前沿(英文)》 2014年 第9卷 第3期 页码 265-269 doi: 10.1007/s11465-014-0311-0
Residual stresses generated in cutting process have important influences on workpiece performance. The paper presents a method of theoretical analysis in order to explicate the formation mechanism of residual stresses in cutting. An important conclusion is drawn that the accumulated plastic strain is the main factor which determines the nature and the magnitude of surface residual stresses in the workpiece. On the basis of the analytical model for residual stress, a series of simulations for residual stress prediction during cutting AISI 1045 steel are implemented in order to obtain the influences of cutting speed, depth of cut and tool edge radius on surface residual stress in the workpiece. And these influences are explained from the perspective of formation mechanism of residual stress in cutting. The conclusions have good applicability and can be used to guide the parameters selection in actual production.
关键词: residual stress analytical model strain plastic cutting parameter
标题 作者 时间 类型 操作
Development of a constitutive model for rockfills and similar granular materials based on the disturbed state
Mehdi VEISKARAMI, Ali GHORBANI, Mohammadreza ALAVIPOUR
期刊论文
Hot-dip galvanizing of cold-formed steel hollow sections: a state-of-the-art review
Min SUN, Jeffrey A. PACKER
期刊论文
Stress induced polarization switching and coupled hysteretic dynamics in ferroelectric materials
Linxiang WANG, Roderick MELNIK, Fuzai LV
期刊论文
Effectiveness of state incentives for promoting wind energy: A panel data examination
Deepak SANGROYA,Jogendra NAYAK
期刊论文
Analysis on annealing-induced stress of blind-via TSV using FEM
Jie SHAO, Tielin SHI, Li DU, Lei SU, Xiangning LU, Guanglan LIAO
期刊论文
An investigation on stress distribution effect on multi- piezoelectric energy harvesters
Hailu YANG, Dongwei CAO
期刊论文