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Correlation between tension softening relation and crack extension resistance in concrete

Xiufang ZHANG , Shilang XU ,

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 3, Pages 323-329 doi: 10.1007/s11709-009-0041-2

Abstract: extension resistance curve, one of the fundamental fracture criteria in crack mechanics.extension resistance curve, to analyze crack propagation during the entire concrete fracture processThe variation of the crack extension resistance is mainly associated with the energy consumption in theThe crack extension resistance is then a function of the softening curve, which is a basic mechanicalThe relationship between the softening curve and the crack extension resistance curve is then analyzed

Keywords： concrete fracture process zone crack extension G_R resistance tension softening curve

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Fracture resistance on aggregate bridging crack in concrete

ZHANG Xiufang, XU Shilang

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 1, Pages 63-70 doi: 10.1007/s11709-007-0006-2

Abstract: In this investigation, the fracture resistance induced by aggregate bridging, denoted by GI-bridging,After this, we further present the calculated procedures of determining this fracture resistance fromUtilizing the obtained load against crack opening displacement curve, the value of G at any crack extensionas well as the change of G with the crack extension is examined.The effects of material strength and specimen depth on this fracture resistance are also investigated

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Influence of welding residual stresses on the ductile crack growth resistance of circumferentially cracked

Xiaobo REN, Odd M. AKSELSEN, B?rd NYHUS, Zhiliang ZHANG

Frontiers of Structural and Civil Engineering 2012, Volume 6, Issue 3, Pages 217-223 doi: 10.1007/s11709-012-0169-3

Abstract: This paper focuses on the effect of welding residual stress on the ductile crack growth resistance ofThe complete Gurson model has been employed to calculate the ductile crack growth resistance.Results show that residual stresses reduce the ductile crack growth resistance.However, the effect of residual stresses on ductile crack growth resistance decreases with the increaseof crack growth.

Keywords： residual stress ductile crack growth resistance complete Gurson model eigenstrain method

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Agricultural extension approach: evidence from an Integrated Soil Fertility Management Project in Ethiopia

Gerba LETA, Steffen SCHULZ, Girum GETACHEW ALEMU

Frontiers of Agricultural Science and Engineering 2020, Volume 7, Issue 4, Pages 427-439 doi: 10.15302/J-FASE-2020331

Abstract:

Agricultural extension is an approach to rural development and agricultural transformation in whichDuring recent decades, different extension approaches have been tested and validated by the Ethiopiangovernment and non-governmental organizations to stimulate in the agricultural extension system (AESFarmer Research and Extension Groups and Farmer Field Schools were found to be central to the participation

Keywords： Ethiopia Farmer Field School Farmer Research and Extension Group governance institutionalization ISFM

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The Research of Mining the Mutative Knowledge With Extension Data Mining

Chen Wenwei

Strategic Study of CAE 2006, Volume 8, Issue 11, Pages 70-73

Abstract:

The thesis standardized the extension information and the extension knowledge, that is, basing onknowledge, the thesis extended the mutative information and knowledge, and nailed down the conceptions of extensiondata mining and extension reasoning.This thesis also attested two theorems of the extension data mining and the formula of the extensionThe author put forward the extension data mining which extended from mining the static knowledge to mining

Keywords： extension information extension knowledge extension data mining extension reasoning

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Study on Extension Strategic Tactical Planning

Yang Chunyan,Zhang Yongjun

Strategic Study of CAE 2002, Volume 4, Issue 10, Pages 73-78

Abstract:

Extension Strategic Tactics Planning (ESTP), based upon the science of extenics, is established alonggenerate the ideas of strategic tactical planning, how to completely analyze the resources, how to exploit extension

Keywords： extension strategic tactical planning contradictory problem extension method idea generation extension

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Extension Controller Design via Sliding Mode Control

Chen Jenyang,Wong Chingchang

Strategic Study of CAE 2001, Volume 3, Issue 9, Pages 48-51

Abstract:

In this paper, a novel extension controller based on the scheme of sliding mode control is investigatedBy integrating the essential concept of extension set theory with the sliding mode control , the robustextension controller can be easily realized.In this study, a basic extension controller is organized first without any specific expert knowledgeActually, the proposed extension controller is stable in the sense of the Lyapunov.

Keywords： extension set extension control sliding mode control system stability

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Dynamic crack propagation in plates weakened by inclined cracks: an investigation based on peridynamics

A. SHAFIEI

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 4, Pages 527-535 doi: 10.1007/s11709-018-0450-1

Abstract: In this paper by using peridynamics, the crack path for inclined crack under dynamic loading were investigatedThe peridynamics solution for this problem represents the main features of dynamic crack propagationsuch as crack bifurcation.In addition, the influence of geometry on inclined crack growth is studied.

Keywords： peridynamics inclined crack dynamic fracture crack branching

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Study on Extension Engineering

Yang Chunyan, Cai Wen

Strategic Study of CAE 2000, Volume 2, Issue 12, Pages 90-96

Abstract:

Extension engineering is the application technology of extension theory and extension method.

Keywords： contradictory problem extension set extensibility extension engineering

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A New Evolution-reasoning Method in Conceptual Design Based on Extension Theory

Hao Yanwei,Liu Haisheng,Zhang Guoxian

Strategic Study of CAE 2003, Volume 5, Issue 5, Pages 63-69

Abstract: p>After existing study methods are analyzed, a new researching model for conceptual design based on extension

Keywords： conceptual design matter elements transform genetic algorithms evolution reasoning extension appraisal

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Generating Available Scheme for Extension Detecting Technology

Yu Yongquan ,Zhang Jiwen

Strategic Study of CAE 2002, Volume 4, Issue 1, Pages 64-68

Abstract:

This work shows a method to obtain an available scheme for extension detecting technology.Based on the theory of extenics, some definitions and conceptions about extension detecting are described

Keywords： detecting matter-element detecting element extension set extension tree

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Peridynamics versus XFEM: a comparative study for quasi-static crack problems

Jinhai ZHAO, Hesheng TANG, Songtao XUE

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 4, Pages 548-557 doi: 10.1007/s11709-017-0434-6

Abstract: However, capturing of complex mixed-mode crack patterns has been proven to be difficult with PD.extended finite element method (XFEM) is one of the most popular methods for fracture which allows crackThe first example is crack propagation in a double notched specimen under uniaxial tension with differentcrack spacings in loading direction.

Keywords： XFEM peridynamic bilateral crack parallel double cracks nonlocal theory

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Adaptive Extension Controller Design for Nonlinear Systems

Wong Qingchang,Chen Zhenyuan

Strategic Study of CAE 2001, Volume 3, Issue 7, Pages 54-58

Abstract:

A design method for the extension controller is developed in this paper.The proposed adaptive extension control resulting from the direct adaptive approach is employed to directlyadapt the gain parameter of the extension controller.Unlike the fuzzy controller, only one linguistic — like level is needed in the extension controllerThe derivation shows that the proposed extension controller is stable in the sense of the Lyapunov.

Keywords： extension theory adaptive control extension controller robust stability

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Extension Detecting Technology

Yu Yongquan

Strategic Study of CAE 2001, Volume 3, Issue 4, Pages 88-94

Abstract: this paper, based on the transformation concept of the contradiction, a new detecting technology—extensiondetecting problems of undetectable physical value the related concepts, basic principle and frame of extension

Keywords： extension detecting technology extrinsic transform of matter element

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Stability and dynamics of rotor system with 45° slant crack on shaft

Yanli LIN, Xiaohui SI, Fulei CHU

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 2, Pages 203-213 doi: 10.1007/s11465-011-0131-4

Abstract:

Crack on a shaft is one of the common damages in a rotor system.slant crack on the rotor system.is larger than that with a transverse crack when the two types of crack have the same depth and thetorsional excitation are analyzed by considering opening and closing of the crack.on a shaft and can be used for the detection of the slant crack on a shaft.

Keywords： rotor dynamics slant crack stability torsional excitation open and close