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A reduced-order method for parameter identification of a crystal plasticity model considering crystal symmetry

Science China(Technological Sciences) 2019年第3期62卷 373-387页

作者： HAN ShiWei YANG XiaoGuang SHI DuoQi HUANG Jia School of Energy and Power Engineering Beihang University Beijing Key Laboratory of Aero-Engine Structure and Strength Shijiazhuang Flying College

The focus of this paper is to identify the material parameters of a crystal plasticity model for Ni-base single crystal superalloys.To facilitate the stepwise calibration of the multistage flow rules, further decoupling and simplification are implemented without compromising its simulating capability. Reduced-order kinematics in crystal plasticity, which only comprise scalar components instead of their original tensors, are derived by considering the crystal symmetry and uniaxial loading condition. The relationships between components in elastic and plastic deformation gradient are established by explicitly accounting the control quantities, which is overall load in stress-controlled creep tests or displacement of gauge section in strain-controlled experiments,respectively. In addition, their approximate forms are also given by neglecting both elastic changes in volume and section area. A new objective function based on the shortest distance was introduced to correlate data from the simulations and experiments, and an integrated optimization process without finite element computation was developed into a commercial software package.Parameters in the crystal plasticity model are successfully calibrated by the efficient reduced-order method from the experimental data in such a sequence as: elastic, plastic, primary stage and secondary to tertiary stages creep laws. The multistage weak coupling flow rules can significantly reduce the non-uniqueness of the optimal solution under the circumstance of excessive parameters but insufficient experimental data. Finally, the optimized results with the reduced-order method have been validated by the finite element method.

关键词： reduced-order crystal plasticity parameter identification finite deformation single crystal crystal symmetry

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Effect of reduction in area per pass on strain distribution and microstructure during caliber rolling in twinning-induced plasticity steel

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Journal of Iron and Steel Research(International) 2020年第1期27卷 62-74页

作者： Joong-ki Hwang Sung Jin Kim School of Mechanical Engineering Tongmyong UniversityBusan 48520Republic of Korea Department of Advanced Materials Engineering Sunchon National UniversitySuncheon 57922Republic of Korea

The effects of reduction in area(RA)per pass during caliber rolling on microstructure and strain distribution of twinninginduced plasticity steel have been investigated to find solutions to make a more homogeneous material along the radial direction for wire rod applications.The steel wires subjected to an average RA per pass of 2.5%(skin pass caliber rolling)and 10.0%(conventional caliber rolling)were analyzed.The skin pass caliber-rolled wire was characterized as a duplex fiber texture of majorand minor.and the textures were almost same at/between center and surface area,which is totally different from those of conventional caliber rolling and wire drawing.The skin pass caliber rolling led to more homogeneous microstructure and mechanical properties along the radial direction in comparison with the conventional caliber rolling and wire drawing due to the more homogeneous Hall-Petch hardening,dislocation hardening,and texture behavior with area,resulting in higher formability.

关键词： Twinning-induced plasticity steel Caliber rolling Deformation twin Reduction in area Skin pass

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Effects of strain state and slip mode on the texture evolution of a near-α TA15 titanium alloy during hot deformation based on crystal plasticity method

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Journal of Materials Science & Technology 2020年第3期38卷 125-134页

作者： Jie Zhao Liangxing Lv Kehuan Wang Gang Liu National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin150001China Institute of High Pressure Fluid Forming Harbin Institute of TechnologyHarbin150001China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin150001China

A thorough understanding of the texture evolution of near-αtitanium alloys during the hot metal forming can help obtain an optimal crystallographic texture and material performance.The strain state has an obvious effect on the texture evolution of near-αtitanium alloys during the hot metal forming.In this paper,the texture evolution of a near-αTA15 titanium alloy during the hot metal forming under different strain states were discussed based on the crystal plasticity finite element method.It is found that the basal and prismatic slip systems are regarded as the dominant slip modes due to the similar low critical resolved shear stress during the hot metal forming of the TA15 sheet rotating the lattice around the[1010]and 0001 axis,respectively.Once both of them cannot be activated,the pyramidal-2 slipping occurs rotating the lattice around the[1010]axis.The relationship between the texture evolution and strain state is established.All the(0001)orientations form a band perpendicular to the direction of the first principal strain.The width of the band along the direction of the second principal strain depends on the ratio of the compressive effect to the tensile effect of the second principal strain.This relationship can help control the crystallographic texture and mechanical properties of the titanium alloys component during the hot metal forming.

关键词： Texture evolution Strain states Crystal plasticity method Near-αTA15 sheets Hot deformation

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Effect of integrating memory on the performance of the fractional plasticity model for geomaterials

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Acta Mechanica Sinica 2018年第5期34卷 896-901页

作者： Yifei Sun Yufeng Gao Shunxiang Song Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai UniversityNanjing 210098China

A fractional plasticity model for geomaterials is proposed by using the fractional derivative.Due to the integral definition of the fractional derivative,the range of load memory for calculating the flow direction may influence the subsequent model performance.Therefore,an investigation on the memory dependence of the model was conducted.It was found that the load memory affected the stress-dilatancy behavior of the geomaterial.Due to the loss of memory from zero-to confiningstress states,slightly higher strain is reported,whereas an insignificant difference in the predicted deviator stress is observed.Thus,for engineering applications,starting the memory from the zero-stress state,which avoids mathematical complexity,is suggested.

关键词： plasticity Fractional calculus Memory

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Correlation Between Crystal Rotation and Redundant Shear Strain in Rolled Single Crystals: A Crystal plasticity FE Analysis

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Acta Metallurgica Sinica(English Letters) 2019年第4期32卷 452-460页

作者： Hui Wang Cheng Lu Kiet Tieu Yu Liu Rui Wang Jintao Li School of Mechanical Materials and Mechatronic Engineering University of Wollongong

The correlation between crystal rotation and redundant shear strain in rolled single crystals was investigated by using the crystal plasticity finite element(CPFE) model in this paper. The deformation in aluminium single crystals of four representative orientations(rotated-Cube, Goss, Copper, and Brass) after rolling and plain strain compression was simulated, and the predictions have been validated by the experimental observations. In the rotated-Cube and Goss, the redundant shear strain and crystal rotation were in the same pattern, alternating along the thickness, while the relation between them was not obvious for the Copper and Brass due to their asymmetrical distributions of activated slip systems. The relations between slip system activation, crystal rotation, and shear strain were investigated based on the CPFE model, and the correlation between shear strain and crystal rotation has been built.

关键词： Crystal plasticity finite element Single crystal Crystal rotation Shear strain Orientation stability

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High-Strength and High-plasticity TWIP Steel for Modern Vehicle

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Journal of Materials Science & Technology 2005年第4期21卷 451-454页

作者： Zhenli MI Di TANG Ling YAN Jin GUO National Engineering Research Center for Advanced Rolling Technology University of Science and Technology Beijing Beijing100083 China

In this paper new high-strength and high-plasticity twinning induced plasticity （TWlP） steel for modern automobile body was investigated. Some basic experimental results were given. The results indicate the TWlP steel has excellent properties. It exhibits high ultimate tensile strength （600,--1100 MPa） and extremely large elongation of 60% to 90%.In the future it would be capable of satisfying the requirements of new generation of vehicle.

关键词： TWIP steel Strength plasticity

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STN-ANT plasticity is crucial for the motor control in Parkinson’s disease model

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Signal Transduction and Targeted Therapy 2021年第7期6卷 1982-1984页

作者： Hui Zhang Chunkui Zhang Zhongwei Qu Bing Li Yujuan Su Xia Li Yan Gao Yizheng Wang Center of Cognition and Brain Science Beijing Institute of Basic Medical SciencesBeijingChina Laboratory of Neural Signal Transduction Institute of NeuroscienceChinese Academy of SciencesShanghaiChina National Clinical Research Center for Aging and Medicine Huashan HospitalFudan UniversityShanghaiChina

Dear Editor,Motor control as a function of the basal ganglia circuit is crucial for every aspect of life and movement disorders,such as Parkinson’s disease(PD).In PD,the progressive denervation of dopamine in the dorsal striatum leads to inhibition of the direct pathway and facilitation of the indirect pathway and results in activation of the subthalamic nucleus(STN)and globus pallidus internus(GPi),two important nuclei in the motor loop of basal ganglia.

关键词： dopamine plasticity activation

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Systematic temperature signaling regulates behavior plasticity

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Protein & Cell 2011年第10期2卷 774-775页

作者： Yun Li Beijing Institutes of Life Science Chinese Academy of SciencesBeijing 100101China

The perception and response of environmental temperatures are vital for the survival,fitness and reproduction of all animal species.As a critical variable that affects the rate and nature of all biological and chemical reactions of the body,temperature has dramatic effect on animal physiology and behaviors.Homeotherms such as mammals maintain a relatively constant core body temperature despite of ambient temperature;changes of body temperature of transgenic mice greatly affect their energy efficiency and life span(Clos et al,1993).However,Poikilotherms such as C.

关键词： behavior plasticity maintain

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Nicotine-induced dopamine plasticity: a gateway to neurotransmitter replacement?

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Neural Regeneration Research 2020年第1期15卷 73-74页

作者： I-Chi Lai Davide Dulcis Department of Psychiatry School of Medicine University of California San Diego

Nicotine,the principal neuroactive component of tobacco,acts on the reward systems of smokers,inducing addiction.Experimental evidence indicates that nicotine-induced addiction alters the activity of dopaminergic neurons within reward-processing brain centers.The effect of developmental nicotine exposure on neuroplasticity of identified reward neurocircuitry in the adult is finally emerging and begins to be understood at the molecular,cellular,and behavioral level(Romoli et al.,2019).

关键词： plasticity smoke gateway

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Incipient plasticity and activation volume of dislocation nucleation for TiZrNbTaMo high-entropy alloys characterized by nanoindentation

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Journal of Materials Science & Technology 2019年第5期35卷 812-816页

作者： Shao-Ping Wang Jian Xu Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 China University of Chinese Academy of Sciences 19(A) Yuquan Road Beijing 100049 China

With instrumented nanoindentation, incipient plasticity of two as-cast BCC TiZrNbTa and TiZrNbTaMo high-entropy alloys(HEAs) are investigated in terms of pop-in events during loading, to characterize the dislocation behavior in these solid-solution alloys. It is shown that the maximum shear stress (max)required for dislocation nucleation is determined to be 1/16-1/12 and 1/18-1/14 of shear modulus for the TiZrNbTa and TiZrNbTaMo HEAs, respectively, which is nearly comparative to the theoretical shear stress of these alloys. The activation volumes of dislocation nucleation the TiZrNbTa and TiZrNbTaMo HEAs are determined to be 1.2 b^3 for and 1.3 b^3, respectively, which is substantially irrespective of alloying with Mo. Furthermore, activation volumes of these two HEAs are on the order of cubic burger’s vector and only one-third of the value for TiZrHfNb HEA, suggesting that a heterogeneous nucleation of dislocation took place in a way of direct atom-vacancy exchange, rather than of the cooperative motion of several atoms. These findings reveal the unique feature in deformation of BCC solid-solution complex alloys.

关键词： High-entropy alloys Nanoindentation Refractory metals BCC phase Incipient plasticity

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