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Mechanical responses of anchoring structure under triaxial cyclic loading

Journal of Rock Mechanics and Geotechnical Engineering 2024年第2期16卷 545-560页

作者： Peng Wang Nong Zhang Qun Wei Xingliang Xu Guangzhen Cui Aoran Li Sen Yang Jiaguang Kan State Key Laboratory of Coal Resources and Safe Mining School of MinesChina University of Mining and TechnologyXuzhou221116China School of Civil Engineering Xuzhou University of TechnologyXuzhou221116China School of Mechanical Engineering Jiangsu University of TechnologyChangzhou213001China

Dynamic load on anchoring structures(AS)within deep roadways can result in cumulative damage and failure.This study develops an experimental device designed to test AS under triaxial loads.The device enables the investigation of the mechanical response,failure mode,instability assessment criteria,and anchorage effect of AS subjected to combined cyclic dynamic-static triaxial stress paths.The results show that the peak bearing strength is positively correlated with the anchoring matrix strength,anchorage length,and edgewise compressive strength.The bearing capacity decreases significantly when the anchorage direction is severely inclined.The free face failure modes are typically transverse cracking,concave fracturing,V-shaped slipping and detachment,and spallation detachment.Besides,when the anchoring matrix strength and the anchorage length decrease while the edgewise compressive strength,loading rate,and anchorage inclination angle increase,the failure intensity rises.Instability is determined by a negative tangent modulus of the displacement-strength curve or the continued deformation increase against the general downward trend.Under cyclic loads,the driving force that breaks the rock mass along the normal vector and the rigidity of the AS are the two factors that determine roadway stability.Finally,a control measure for surrounding rock stability is proposed to reduce the internal driving force via a pressure relief method and improve the rigidity of the AS by full-length anchorage and grouting modification.

关键词： triaxial stress Dynamic-static combination load Cyclic loading Anchoring structure(AS) Cumulative damage

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NEW NON QUADRATIC ORTHOTROPIC YIELD FUNCTION FOR triaxial stress STATE

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Transactions of Nonferrous Metals Society of China 1992年第2期2卷 62-67页

作者： Zhou Weixian Northwestern Polytechnical University Xi'an 710072China

A new Don-quadratic orthotropic yield function is developed in the present paper.It does not have those limitatioins which existing non-quadratic anisotropic yield functions have,such as being usable only for the plane stress problems and in-plane isotropic sheet metals,and that the directions of principal stress or the ex ponent in yield function can not be arbitrary,etc.Furthermore all of the material constants involved in this yield function can be determined by performing only uniaxial tension lest.This yield function contains three new parameters,of which each one is present for one principal plane of anisotropy.Their values can be.generally,selected to equal 3.Other methods to determine the value of these parmeters are discussed and given in this paper.From the regression estimate for the yield stress in five directions of several kinds of titanium metal sheet.it is obtained that the suitable value of exponent in yield function for titanium sheets is 6 or 8.This is confirmed from the use for several plastic deformation problems of titanium sheets.

关键词： orthotropy triaxial stress yield function

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Effect of B_(4)C on strength coefficient,cold deformation and work hardening exponent characteristics of Mg composites

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Journal of Magnesium and Alloys 2022年第5期10卷 1381-1400页

作者： S.Suresh M.Navaneetha Krishnan S.C.Vettivel Department of Mechanical Engineering University College of EngineeringNagercoilTamilnaduIndiaPin:629004 Department of Mechanical Engineering Universal College of Engineering and TechnologyVallioorTamilnaduIndiaPin:627117 Department of Mechanical Engineering Chandigarh College of Engineering and TechnologyChandiagarh 160019India

The emphasis of this exploration was to examine the workability and work hardening performance of Mg(Magnesium)specimen and Mg-B_(4)C composites created via the powder metallurgy technique.The pure Mg and Mg-B_(4)C composites are made with distinct weight percentages(Mg-5%B_(4)C,Mg-10%B_(4)C,and Mg-15%B_(4)C)at the unit aspect ratio.The powders and composites characterization are executed by SEM(Scanning Electron Microscope),EDS(Energy Dispersive Spectrum)with an elemental map,and XRD(X-ray Diffraction)examination.It displays that,the B_(4)C particles were dispersed consistently with the Mg matrix.The workability and work hardening examination was conducted in triaxial stress conditions using the cold deformation process.The consequence of workability stress exponent factor(β_(σ)),distinct stress proportion factors(σ_(m)/σ_(eff)and σ_(θ)/σ_(eff)),instantaneous work hardening exponent(n_(1)),work hardening exponent(n),coefficient of strength(k)and instantaneous coefficient of strength(k_(1))are recognized.The outcome displays that Mg-15%B_(4)C specimen has greater workability and work hardening parameter,initial relative density,and triaxial stresses compared with the Mg specimen and Mg-(5–10%)B_(4)C composites.

关键词： Powder metallurgy Cold deformation Workability Instantaneous work hardening exponent Workability stress exponent triaxial stress

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Influence of Carbon Content on Strain Hardening Behaviour of Sintered Plain Carbon Steel Preforms

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Journal of Iron and Steel Research(International) 2011年第9期18卷 33-40页

作者： S Narayan A Rajeshkannan Mechanical Engineering The University of the South PacificLaucala Campus

Complete experimental investigation on the instantaneous strain hardening behaviour of powder metallurgy （P/M） preforms of pure iron, Fe 0.35%C, Fe-0.75%C and Fe-1.1%C was carried out. The strain hardening be haviour of the above-mentioned P/M sintered steel preforms with aspect ratio of 0.4 under triaxial stress state condition was determined by cold upsetting under nil/no and graphite lubricant conditions. The instantaneous strain hardening value （ni）, strength coefficient （Ki）, and the stress as a function of strain and densification were obtained and analyzed. Furthermore, a relation was obtained from a semi-log plot of stress against relative density and analyzed to study the hardening behaviour owing to densification as stress was a function of induced strain as well as densification in the P/M materials.

关键词： strain hardening exponent density hardening exponent strength coefficient densification triaxial stress

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DILATATIONAL PLASTIC CONSTITUTIVE EQUATIONS AND THEIR APPLICATION TO DUCTILE FRACTURE ANALYSIS OF AXISYMMETRIC SPECIMENS

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Acta Mechanica Sinica 1985年第1期1卷 49-58页

作者： Li Guochen (Institute of Mechanics,Academia Sinica) Institute of Mechanics Academia Sinica China

In many ductile materials voids nucleate and grow under large strain and triaxial stress,which yield volumetric plastic expansion.A constitutive equation is presented,which accounts for thisplastic dilatancy.The plastic moduli involved in this equation can be calibrated by using necking testsof axisymmetric bars,void model an ysis and computer simulation,To verify the rationality of such aconstitutive equation and adjust the values of plastic moduli,the constitutive equation with its modulito be determined is applied to analyse the ductile fracture behaviour of axisymmetric bars.

关键词： plastic dilatation dilatational constitutive equation irreversible strain softening void strain triaxial stress computer simulation ductile fracture

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