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Journal of Beijing Institute of Technology 2016年第S2期25卷 56-59页

作者：张晓天刘涛何宁泊王睿青 School of Astronautics Beihang University

Composite materials,due to their inherently superior mechanical properties,have been used increasingly in bumper shield systems for space vehicles against space debris.A new numerical method for predicting the damaged states of the composite bumper is reported,in which an orthotropic continuum material model and corresponding orthotropic element fracture technique have been developed and integrated ***,a numerical material model,which is utilized to present the response of composite laminates for hypervelocity impact(HVI),is developed and implemented in the ***,the principle of the node-separation technique is presented and the feasibility of node-separation finite element method(NS-FEM) for HVI simulation has been ***,a case of HVI is simulated by two numerical methods,***-FEM and the smoothed particle hydrodynamics(SPH).The simulation outputs show that NS-FEM not only can better simulate the damage evolution of composite materials but also has a higher computational efficiency.

关键词： space debris hypervelocity impact finite element method material model

material model Research on Rubber Vibration Isolators

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International Journal of Plant Engineering and Management 2007年第2期12卷 61-68页

作者： WANG Rui LI Shi-qi SONG Shao-yun School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan 430074 P. R. China

A viscohyperelastic constitutive model is proposed to describe the mechanical behaviour of vibration isolation rubber under broad-band vibration. This constitutive model comprises two parts： a component with three parameters to characterize the hyperelastic static properties of rubber materials, and the other component incorporating two relaxation time parameters, corresponding to high and low strain rates, respectively, to describe the dynamic response under vibration and impact loadings. Based on this proposed constitutive model, a series of experiments were performed on two types of rubber materials over a wide strain rate range. The results predicted from this model are in good agreement with the experimental data.

关键词： viscohyperelastic constitutive model rubber vibration isolator material model

An Inelastic material model for Lateral Torsional Buckling and Biaxial Bending of Steel W-Shapes

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Journal of Civil Engineering and Architecture 2021年第12期15卷 599-603页

作者： Barry T.Rosson Department of Civil Environmental and Geomatics EngineeringFlorida Atlantic UniversityBoca RatonFL 33431USA

A new material model for beam elements was developed for use as normalized tangent modulus expressions when performing 3-dimensional second-order inelastic analyses of steel I-section *** stiffness matrix of a 14 degree-of-freedom beam element was updated to include the effects of yielding on ***’s torsion and bimoment stiffness at the initial and terminal nodes.A validation study compared the new model’s results with those from published detailed finite element analyses and was found to be in very close agreement.A biaxial end-moment study with two different depth-to-flange-width ratios provided expected and consistent results over a range of moment conditions.

关键词： Nonlinear analysis lateral torsional buckling biaxial bending stiffness reduction material model

Beam Element material model for Rotary-Straightened Steel W-Shapes

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Journal of Civil Engineering and Architecture 2021年第2期15卷 57-62页

作者： Barry T.Rosson Department of Civil Environmental and Geomatics EngineeringFlorida Atlantic UniversityBoca RatonFL 33431USA

An inelastic material model that was previously developed by the author for standard W-Shapes was adapted for use to model the behavior and strength of rotary-straightened hot rolled W-Shape *** a published residual stress model for these W-Shapes,limit load analyses were conducted using the material model in MASTAN2 and were compared with published finite element *** material model required an adjustment to the initial yield moment conditions and residual stress *** with published results indicate that these minor modifications were sufficient to provide very good modeling *** previously developed material model can be used effectively to model the limit load conditions of rotary-straightened hot rolled W-Shape beams and beam-columns in steel *** effect of rotary-straightening W-Shapes is more significant for minor axis bending conditions and this becomes more pronounced as the floor load magnitudes increase.

关键词： Nonlinear analysis steel buildings stiffness reduction material model

Fatigue analysis of closed-cell aluminium foam using different material models

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Transactions of Nonferrous Metals Society of China 2021年第9期31卷 2787-2796页

作者： M.ULBIN S.GLODEŽ Faculty of Mechanical Engineering University of MariborSmetanova 172000 MariborSlovenia

The fatigue analyses of AlSi7 closed-cell aluminium foam were performed using a real porous model and three different homogenised material models:crushable foam model,isotropic hardening model and kinematic hardening *** numerical analysis using all three homogenised material models is based on the available experimental results previously determined from fatigue tests under oscillating tensile loading with the stress ratio R=*** obtained computational results have shown that both isotropic and kinematic hardening models are suitable to analyse the fatigue behaviour of closed-cell aluminium ***,the kinematic hardening material model has demonstrated significantly shorter simulation time if compared to the isotropic hardening material *** the other hand,the crushable foam model is recognized as an inappropriate approach for the fatigue analyses under tension loading conditions.

关键词： closed-cell aluminium foams fatigue numerical analysis material model

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Macro-phenomenological high-strain-rate elastic fracture model for ice-impact simulations

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Chinese Journal of Aeronautics 2023年第3期36卷 146-160页

作者： Jiang FAN Qinghao YUAN Fulei JING Guangchen BAI Xiuli SHEN School of Energy and Power Engineering Beihang UniversityBeijing 100191China Beijing Key Laboratory of Aero-Engine Structure and Strength Beijing 100191China Collaborative Innovation Center of Advanced Aero-Engine Beijing 100191China Aero-Engine Academy of China Aero Engine(Group)Corporation of ChinaBeijing 101304China

The ice impact can cause a severe damage to an aircraft’s exposed structure,thus,requiring its *** numerical simulation represents an effective method to overcome this *** establishment of the ice material model is ***,ice is not a common structural material and exhibits an extremely complex material *** material models of ice reported so far are not able to accurately simulate the ice behavior at high strain *** study proposes a novel high-precision macro-phenomenological elastic fracture model based on the brittle behavior of ice at high strain *** developed model has been compared with five reported models by using the smoothed particle hydrodynamics method so as to simulate the ice-impact process with respect to the impact speeds and ice *** important metrics and phenomena(impact force history,deformation and fragmentation of the ice projectile and deflection of the target)were compared with the experimental data reported in the *** findings obtained from the developed model are observed to be most consistent with the experimental data,which demonstrates that the model represents the basic physics and phenomena governing the ice impact at high strain *** developed model includes a relatively fewer number of material ***,the used parameters have a clear physical meaning and can be directly obtained through ***,no adjustment of any material parameter is needed,and the consumption duration is also *** advantages indicate that the developed model is suitable for simulating the iceimpact process and can be applied for the anti-ice impact design in aviation.

关键词： Crack propagation Elastic fracture High strain rate Ice impact Impact force material model

Numerical Simulation of Warm Forming Behavior of High Strength Aluminum Alloy 7075

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Transactions of Nanjing University of Aeronautics and Astronautics 2016年第5期33卷 620-625页

作者： Wang Hui Yan Dawei Liang Yangmin Xie Guoyin College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 P. R. China Xi'an Aero-Engine (Group) LTD Xi'an 710021 P.R. China

Numerical analysis is critically important to understanding the complex deformation mechanics that occur during sheet forming *** has been widely used in simulation of sheet metal forming processes at room temperature in the automotive ***,material at elevated temperature behaves more differently than at room temperature and specific material parameters and models need to be developed for the simulation of warm *** on the experimental investigation of material behavior of high strength aluminum alloy 7075(AA7075),constitutive equations with strain rate sensitivity at 140,180 and 220 ℃ are *** yield criterion Barlat 89 is used in the *** forming of limit dome height tests and limit drawing ratio tests of AA7075 at 140,180 and 220℃are *** limit diagrams developed from experiment at several elevated temperatures in the previous study are used to predict the failure in the simulation *** force and displacement predicted from simulation are compared with the experimental *** results agree with experimental results,so the developed material model can be used to accurately predict material behavior during isothermal warm forming of the AA7075-T6 alloy.

关键词： high strength aluminum alloy warm forming numerical simulation material model

Theoretical and experimental study on fiber Bragg grating sensing of rock strata settlement deformation

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Journal of Coal Science & Engineering(China) 2008年第3期14卷 394-398页

作者：刘金瑄柴敬魏世明李毅朱磊邱标 School of Energy Science and Engineering Xi'an University of Science and TechnologyXi'an 710054China Key Laboratory of Western Mine Exploitation and Hazard Prevention Xi'an 710054China

Based on the theory of fiber Bragg grating sensing, and using a 2 m plane stress material model of the simulation experiment, the wavelength shift regulations of fiber Bragg gratings under rock settlement deformation conditions were got, which provided reliable basis for the design of the wavelength bandwidth of sensing gratings. The wavelength increase when the rock layers are Compressive strain sensitivity is bigger under tension, and decrease under compression. than tensile strain sensitivity when the load is lower. However compressive strain sensitivity is smaller than tensile strain sensitivity when the load is higher. Experimental result coincides well with theory. The wavelength bandwidth of two neighboring fiber Bragg gratings of the gratings used for monitoring the deformation of rock layer should be no less than 6 nm. An effective new approach for detecting the deformation of rock settlement with fiber Bragg gratings is provided.

关键词： material model monitoring fiber grating sensor

Numerical model Research on Rotational Performance of Beam-Column High-Strength Bolt Extension End-Plate Connection Node

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Open Journal of modelling and Simulation 2021年第3期9卷 231-245页

作者： Xiao Lang School of Civil Engineering and Architecture Southwest University of Science and Technology Mianyang China

The high-strength bolted end plate connection is widely used in the construction industry with its green environmental protection and excellent seismic performance. The joints of the joints are semi-rigid, the force performance is extremely complicated, and the experimental research cost is relatively high, and the cycle is very long. Therefore, the establishment of an efficient numerical model is of great significance for evaluating the force performance of high-strength bolt end plates. In this paper, the influence of different material models on the rotation performance of the joint is studied by numerical simulation, and the bending moment-rotation curve is obtained. The numerical simulation and the experimental results are in good agreement, so as to provide a reference for the design and application of this kind of joint.

关键词： High-Strength Bolt Rotation Performance material model Numerical model

A Virtual Work Approach to modeling the Nonlinear Behavior of Steel Frames

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Journal of Civil Engineering and Architecture 2018年第5期12卷 323-334页

作者： Barry T.Rosson Department of Civil Environmental and Geomatics Engineering Florida Atlantic University Boca Raton FL 33431 USA

The stiffness reduction is studied in detail of compact W-Shapes （wide-flange steel shapes） that results from yielding of the cross-section due to uniaxial bending and axial compression. Three-dimensional m-p-τ surface plots developed from detailed fiber element models of a W8x31 are used to develop a generalized material model for direct implementation in the virtual work method. A portal steel frame is used to illustrate the virtual work method with the nonlinear material model in a first-order, inelastic analysis implementation and in a second-order, inelastic analysis condition. The nonlinear modeling capabilities of MASTAN2 are used to verify the accuracy of the virtual work results and are found to be in very close agreement.

关键词： Nonlinear analysis steel beam-columns stiffness reduction material model virtual work.