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Unified simulation of hardening and softening effects for metals up to failure

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Applied Mathematics and Mechanics(English Edition) 2021年第12期42卷 1685-1702页

作者： Siyu WANG Lin ZHAN Huifeng XI O.t.bruhns Heng XIAO School of Mechanics and Construction Engineering MOE Key Lab of Disaster Forecast and Control in EngineeringJinan UniversityGuangzhou 510632China Institute of Mechanics Ruhr-University BochumBochum D-44780Germany

toward accurately simulating both hardening and softening effects for metals up to failure,a new finite strain elastoplastic J2-flow model is proposed with the yield strength therein as a function of the plastic work in the explicit *** no need to identify any adjustable parameters,the uniaxial stress-strain response predicted from this new model is shown to automatically and accurately match any given data from monotonic uniaxial extension tests of *** such,the objectives in three respects are achieved for the first time,i.e.,(i)both the hardening and softening effects up to failure can be simulated in the sense of matching test data with no errors,(ii)the usual tedious implicit procedures toward identifying numerous unknown parameters need not be involved and can be totally bypassed,and(iii)the model applicability can be ensured in a broad sense for various metallic materials with markedly different transition effects from hardening to *** the new model,the complete response features of stretched bars and twisted tubes up to failure are studied,including the failure effects of bars under monotonic extension and tubes under monotonic torsion and,furthermore,the fatigue failure effects of bars under cyclic *** results show accurate agreement with the uniaxial data,and the results for both the shear stress and the normal stress at the finite torsion display realistic hardening-to-softening transition effects for the first time.

关键词： metal hardening softening failure necking yield strength accurate approach

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多晶铜和铝单轴棘轮行为的循环晶体塑性本构模拟

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四川大学学报（工程科学版） 2012年第S2期44卷 80-83页

作者：罗娟康国政董亚伟 otto t.bruhns 西南交通大学力学与工程学院四川成都610031 波鸿鲁尔大学连续介质力学研究所

针对实验揭示的面心立方金属多晶紫铜和多晶纯铝的单轴棘轮行为演化特征,采用一种基于晶体塑性理论的循环多晶塑性本构模型,对这两种多晶金属材料的单轴棘轮行为进行了本构描述。采用的循环多晶塑性本构模型中使用了一种简单的显式尺度... 详细信息

针对实验揭示的面心立方金属多晶紫铜和多晶纯铝的单轴棘轮行为演化特征,采用一种基于晶体塑性理论的循环多晶塑性本构模型,对这两种多晶金属材料的单轴棘轮行为进行了本构描述。采用的循环多晶塑性本构模型中使用了一种简单的显式尺度过渡法则。结果表明:该本构模型对两种材料的单轴棘轮行为及其应力幅值和平均应力依赖性给出了很好地理论描述;同时,还揭示了面心立方单晶棘轮行为对单晶晶向的强烈依赖性。

关键词：晶体塑性单轴棘轮多晶体面心立方金属

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time-frequency multiresolution of fault-generated transient signals in transmission lines using a morphological filter

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Protection and Control of Modern Power Systems 2023年第2期8卷 85-98页

作者： Juan Carlos Quispe John Morales Eduardo Orduna Carlo Liebermann Michael bruhns Peter Schegner Universidad Nacional de San Juan-CONICEt San JuanArgentina Universidad tecnológica del Perú LimaPerú technical University of Dresden DresdenGermany

the ongoing transformation of electrical power systems highlights the weaknesses of the protection schemes of traditional devices because they are designed and configured according to traditional characteristics of the ***,this work proposes a new methodology to study the fault-generated high frequency transient signals in transmission lines through multiresolution *** high frequency components are determined by a new digital filtering technique based on mathematical morphology theory and a spectral energy ***,wide spectra of signals in the time–frequency domain are *** performance of this method is verified on an electrical power system modeled in AtP-Draw,where simulation and test signals are developed for different locations,fault resistances,inception angles,high frequency noises,sampling frequencies,types of faults,and shapes of the structuring *** results show the characteristics of the fault such as the traveling wave frequency,location,and starting time.

关键词： Digital filter High frequency Mathematical morphology time–frequency traveling waves

Correction to:Large deformation plasticity

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Acta Mechanica Sinica 2021年第12期37卷 1839-1839页

作者： O.t.bruhns Institute of Mechanics Ruhr-University Bochum44780 BochumGermany

Correction to:Acta ***://***/10.1007/s10409-020-00926-7 the article'Large deformation plasticity From basic relations to finite deformation,written by otto ***,was originally published Online first without open *** publication in volume[36],issue[2],page[472-492]the author decided to opt for Open Choice and to make the article an Open Access publication.

关键词： deformation plasticity Open

Exact simulation for direction-dependent large elastic strain responses of soft fibre-reinforced composites

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Applied Mathematics and Mechanics(English Edition) 2023年第9期44卷 1497-1510页

作者： Huifeng XI Guicheng ZHAO Obruhns Siyu WANG Heng XIAO School of Mechanics and Construction Engineering MOE Key Lab of Disaster Forecast and Control in EngineeringJinan UniversityGuangzhou 510632China Institute of Mechanics Ruhr-University BochumBochum D-44780Germany

An explicit form of the elastic strain-energy function for direction-dependent large elastic strain behaviors of soft fiber-reinforced composites is first presented based upon a decoupled approach for simulating complex nonlinear coupling *** this form,the exact closed-form solutions are then obtained for the uniaxial tension responses in the fiber and cross-fiber *** such exact solutions,the issue of simultaneously simulating strongly coupling nonlinear responses in the fiber and cross-fiber directions may be reduced to the issue of separately treating each decoupled uniaxial stress-strain response,thus bypassing usual complexities and uncertainties involved in identifying a large number of strongly coupled adjustable *** numerical examples given are in good agreement with the experimental data for large strain responses.

关键词： soft solid fiber-reinforced composite large elastic strain transverse isotropy strain-energy function logarithmic strain decoupling approach

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七位对数表新1版

七位对数表

1977年

作者：布鲁斯（bruhns C.）刘述文译

是一本七位对数表工具书

ISBN: (纸本)15039·新75

是一本七位对数表工具书

关键词：数学表学科:对数

来源：汇雅图书（南通市图书馆... 评论

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西门子公司预告八台大型计算机

计算机工程 1980年第2期 42-47+58页

作者： Gerhard WIEHLER ,Friedrich-Karl bruhns ,王金生

电子数据处理系统的性能越来越强,这种倾向近来不但得以证实,而且还在加强。根本的动力也许是继续迅速地发展主要影响价格/性能的工艺、使用更先进的操作系统、开拓新的应用范围,尤其有必要研究复杂的复合网络。随着预告西门子的四种型... 详细信息

电子数据处理系统的性能越来越强,这种倾向近来不但得以证实,而且还在加强。根本的动力也许是继续迅速地发展主要影响价格/性能的工艺、使用更先进的操作系统、开拓新的应用范围,尤其有必要研究复杂的复合网络。随着预告西门子的四种型号计算机———7·761、7·762、7·770.7·780、7·700系列的性能大大地提高了。就单处理机(其工作速度超过4百万次/秒)和多处理机而言,这一步证实了慕尼黑西门子公司的研制能力,并给用户和市场在未来性能提高方面和胜任八十年代复杂任务方面带来了可靠保证。

关键词：大型计算机处理机配件缓冲器零部件西门子主存存储器存贮器