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Parametric equations for notch stress concentration factors of rib–deck welds under bending loading
《结构与土木工程前沿(英文)》 2021年 第15卷 第3期 页码 595-608 doi: 10.1007/s11709-021-0720-1
关键词: notch stress concentration factor rib–deck weld parametric analysis regression analysis parametric equation
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
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。
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《机械工程前沿(英文)》 2014年 第9卷 第3期 页码 281-294 doi: 10.1007/s11465-014-0307-9
In this study, the stress concentration factors (SCF) in cross-and-angle-ply laminated composite plates as well as in isotropic plates with single circular holes subjected to uniaxial loading is studied. A quadrilateral finite element of four-node with 32 degrees of freedom at each node, previously developed for the bending and mechanical buckling of laminated composite plates, is used to evaluate the stress distribution in laminated composite plates with central circular holes. Based up on the classical plate theory, the present finite element is a combination of a linear isoparametric membrane element and a high precision rectangular Hermitian element. The numerical results obtained by the present element compare favorably with those obtained by the analytic approaches published in literature. It is observed that the obtained results are very close to the reference results, which demonstrates the accuracy of the present element. Additionally, to determine the first ply failure (FPF) of laminated plate, several failure criterions are employed. Finally, to show the effect of ratio on the failure of plates, a number of figures are given for different fiber orientation angles.
关键词: laminated composite plates stress concentration geometric singularity anisotropic effect
OUYANG Shan, ZHANG Qinghua, QIAO Fuyuan
《医学前沿(英文)》 2007年 第1卷 第4期 页码 386-389 doi: 10.1007/s11684-007-0075-6
关键词: pregnancy concentration possible relationship responsible hepatocyte
穆志韬
《中国工程科学》 2002年 第4卷 第3期 页码 68-72
依据海军现役飞机的腐蚀环境特点及结构件腐蚀损伤深度拟合规律,采用应力场强法和局部应力应变法分别对疲劳缺口系数Kf及疲劳寿命计算模型进行了分析,提出了一种腐蚀环境下飞机结构疲劳寿命的评定方法。该方法以室温大气环境下的寿命评定结论为依据,考虑了结构件腐蚀损伤后潮湿空气、盐雾、盐雾+SO2等环境介质对疲劳寿命的影响,并结合国产某型飞机机翼前梁缘条腐蚀损伤部位的疲劳寿命及剩余寿命估算实例进行了分析。
Chidamide inhibits the NOTCH1-MYC signaling axis in T-cell acute lymphoblastic leukemia
《医学前沿(英文)》 2022年 第16卷 第3期 页码 442-458 doi: 10.1007/s11684-021-0877-y
关键词: T-cell acute lymphoblastic leukemia HDAC inhibitor chidamide NOTCH1 MYC ubiquitination
Mohammod Abdul HAMID,Xi WANG,Xiangdong DING,Chuduan WANG,Xingbo ZHAO
《农业科学与工程前沿(英文)》 2014年 第1卷 第3期 页码 236-241 doi: 10.15302/J-FASE-2014034
Role of Wnt and Notch signaling in regulating hair cell regeneration in the cochlea
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《医学前沿(英文)》 2016年 第10卷 第3期 页码 237-249 doi: 10.1007/s11684-016-0464-9
Sensory hair cells in the inner ear are responsible for sound recognition. Damage to hair cells in adult mammals causes permanent hearing impairment because these cells cannot regenerate. By contrast, newborn mammals possess limited regenerative capacity because of the active participation of various signaling pathways, including Wnt and Notch signaling. The Wnt and Notch pathways are highly sophisticated and conserved signaling pathways that control multiple cellular events necessary for the formation of sensory hair cells. Both signaling pathways allow resident supporting cells to regenerate hair cells in the neonatal cochlea. In this regard, Wnt and Notch signaling has gained increased research attention in hair cell regeneration. This review presents the current understanding of the Wnt and Notch signaling pathways in the auditory portion of the inner ear and discusses the possibilities of controlling these pathways with the hair cell fate determiner Atoh1 to regulate hair cell regeneration in the mammalian cochlea.
关键词: inner ear cochlea hair cell regeneration Wnt Notch signaling pathways
Stress field near circular-arc interface crack tip based on electric saturation concept
Longchao DAI, Xinwei WANG
《机械工程前沿(英文)》 2009年 第4卷 第3期 页码 320-325 doi: 10.1007/s11465-009-0042-9
关键词: piezoelectric material arc crack strip saturation stress intensity factor
Unidirectional and stage-dependent roles of Notch1 in Wnt-responsive Lgr5
Hui Jiang, Shan Zeng, Wenli Ni, Yan Chen, Wenyan Li
《医学前沿(英文)》 2019年 第13卷 第6期 页码 705-712 doi: 10.1007/s11684-019-0703-y
Mixed mode properties of CNT reinforced composites using Arcan test rig
Jacob MUTHU
《结构与土木工程前沿(英文)》 2015年 第9卷 第4期 页码 397-404 doi: 10.1007/s11709-015-0321-y
《结构与土木工程前沿(英文)》 2021年 第15卷 第4期 页码 914-936 doi: 10.1007/s11709-021-0750-8
关键词: numerical modeling extended finite element method porous media crack growth stress intensity factor
Crack propagation with different radius local random damage based on peridynamic theory
《结构与土木工程前沿(英文)》 2021年 第15卷 第5期 页码 1238-1248 doi: 10.1007/s11709-021-0695-y
标题 作者 时间 类型 操作
Parametric equations for notch stress concentration factors of rib–deck welds under bending loading
期刊论文
Finite element analysis of stress concentrations and failure criteria in composite plates with circular
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期刊论文
Relationship between expression of hepatocyte grow factor and apoptosis of trophoblasts in hypertensive
OUYANG Shan, ZHANG Qinghua, QIAO Fuyuan
期刊论文
Measurement of trimethylamine concentration and evaluation of pig meat natural quality by a spectrophotometric
Mohammod Abdul HAMID,Xi WANG,Xiangdong DING,Chuduan WANG,Xingbo ZHAO
期刊论文
Stress field near circular-arc interface crack tip based on electric saturation concept
Longchao DAI, Xinwei WANG
期刊论文
Unidirectional and stage-dependent roles of Notch1 in Wnt-responsive Lgr5
Hui Jiang, Shan Zeng, Wenli Ni, Yan Chen, Wenyan Li
期刊论文
An investigation on prevalent strategies for XFEM-based numerical modeling of crack growth in porous media
期刊论文