Three-dimensional nonlinear orthotropic finite element material model for wood

2000 ◽  
Vol 50 (2) ◽  
pp. 143-149 ◽  
Author(s):  
Ala Tabiei ◽  
Jin Wu
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Material Model

scholarly journals Hot Workability of Ultra-Supercritical Rotor Steel Using a 3-D Processing Map Based on the Dynamic Material Model

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4118
Author(s):  
Xuewen Chen ◽  
Yuqing Du ◽  
Tingting Lian ◽  
Kexue Du ◽  
Tao Huang
Keyword(s):  
Finite Element ◽  
Alloy Steel ◽  
Thermal Processing ◽  
Processing Map ◽  
Three Dimensional ◽  
Material Model ◽  
Strain Rates ◽  
Rotor Steel ◽  
Dynamic Material Model ◽  
Finite Element Software

As a new-type of ultra-supercritical HI-IP rotor steel, X12CrMoWVNbN10-1-1 alloy steel has excellent integrative performance, which can effectively improve the power generation efficiency of the generator set. In this paper, uniaxial thermal compression tests were carried out over a temperature range of 950–1200 °C and strain rates of 0.05–5 s−1 with a Gleeble-1500D thermal simulation testing machine. Moreover, based on hot compression experimental data and the theory of processing diagrams, in combination with the dynamic material model, a three-dimensional (3-D) thermal processing map considering the effect of strain was constructed. It was concluded that optimum thermal deformation conditions were as follows: the temperature range of 1150–1200 °C, the strain rate range of 0.05–0.634 s−1. Through secondary development of the finite element (FE) software FORGE®, three-dimensional thermal processing map data were integrated into finite element software FORGE®. The distributions of instability coefficient and power dissipation coefficient were obtained over various strain rates and temperatures of the Ø 8 × 12 mm cylinder specimen by using finite element simulation. It is shown that simulation results are consistent with the microstructure photos. The method proposed in this paper, which integrates the three-dimensional processing map into the finite element software FORGE® (Forge NxT 2.1, Transvalor, Nice, France), can effectively predict the formability of X12CrMoWVNbN10-1-1 alloy steel.

Finite Element Analysis of a Steady-State Rotating Tire Subjected to Point Load or Ground Contact

1987 ◽  
Vol 15 (4) ◽  
pp. 243-260 ◽  
Author(s):  
R. Kennedy ◽  
J. Padovan
Keyword(s):  
Finite Element ◽  
Steady State ◽  
Contact Point ◽  
Three Dimensional ◽  
Static Problem ◽  
Material Model ◽  
Point Load ◽  
Ground Contact ◽  
Element Analysis ◽  
Automobile Tire

Abstract A radial automobile tire undergoing steady-state rotation is analyzed by a finite element method. A special formulation is used which allows the finite element equations to be solved as a quasi-static problem using static analysis solution procedures, rather than as a dynamic problem requiring solution in the time domain. This is accomplished through a transformation of variable that changes time derivatives, present through inertia, to spatial derivatives. Solution time for the analysis is thereby shortened. The tire is modeled first as a two-dimensional ring on an elastic foundation, then in its full three-dimensional geometry. Rotational speeds are those at which resonance occurs so that the dynamics can be easily visualized and the response easily verified. The models are subjected to point load excitation or ground contact. Point load is used to predict resonance responses of the undamped tire. Results agreed well with experimental measurements. The effect of inertia components and damping on vibrational response of the tire was studied by imposing ground contact at one of the resonance speeds. Damping is included in the model through a two-element Kelvin-Voight viscoelastic material model. Responses of the models were similar to standing wave deformations in a tire.

Research on Ultrasonic Shot Peening through Numerical Simulation

2015 ◽  
Vol 778 ◽  
pp. 59-62 ◽  
Author(s):  
Yan Jun Fan ◽  
Xiao Hui Zhao
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Shot Peening ◽  
Three Dimensional ◽  
Material Model ◽  
Simulation Method ◽  
Strengthening Mechanism ◽  
Mechanical Parts ◽  
Element Simulation ◽  
Ultrasonic Shot Peening

Ultrasonic shot peening can be used to strengthen mechanical parts. Its equipment structure is compact, which is convenient for incorporated into production line. It is fitting to facilitate operation and high reproducibility without dust pollution and noise. The finite element simulation method of ultrasonic shot peening further contributes to the development of ultrasonic shot peening technology. In the present work, finite element simulation method was adopted to establish a three-dimensional numerical model for analyzing the strengthening mechanism of ultrasonic shot peening. By choosing reasonable material model and different combination of parameters (such as treated material, diameter of shots, peening velocity), the curves of residual stress vs. depth of alloy materials were obtained, including the relationships between the peak value and depth of residual compression stress and peening velocity.

scholarly journals Finite element model of bamboo culm (Phyllostachys sp.) and its comparison to two experimental tests

2010 ◽  
Vol 58 (1) ◽  
pp. 153-160
Author(s):  
Václav Sebera ◽  
Jan Tippner ◽  
Petr Horáček ◽  
Aleš Dejmal ◽  
Martin Beníček
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Experimental Tests ◽  
Material Model ◽  
Element Model ◽  
Parametric Models ◽  
Bending Test ◽  
Bamboo Culm ◽  
Culm Wall

The main goal of the work was to build up a general parametric finite-element model of a bamboo culm in ANSYS computational system. Subsequently the model was compared to a experimental measurements of chosen mechanical properties – three point bending test and brasil test. A pa­ra­me­ter being compared was a force, which is necessary to exert to deform a sample on given strain. In this work two parametric models were created. First one is including dividing barrier – diaphragm. A mesh of the culm wall is mapped and is divided into three layers with different orthotropic material models in cylindrical coordinate system with respect to the culm axis. By contrast the barrier – diaphragm – is represented by free mesh with isotropic material model. Both FE models are fully parametric and three-dimensional. Hence they are very well utilizable for both further research of the bamboo itself and constructions from it.

Evaluation of Permanent Deformation Models in Asphalt Mixture Overlays for Hot Climates

2013 ◽  
Vol 723 ◽  
pp. 737-744
Author(s):  
Aaron D. Mwanza ◽  
Pei Wen Hao ◽  
Xiao Ming Dong
Keyword(s):  
Finite Element ◽  
Prediction Models ◽  
Simulation Analysis ◽  
Permanent Deformation ◽  
Asphalt Mixture ◽  
Three Dimensional ◽  
Material Model ◽  
Element Analysis ◽  
Constitutive Material Model ◽  
Falling Weight

Results from a third mobile load simulator (MLS3) experiment indicates that in-situ determination of the under laying pavement material elastic modulus properties using the back calculation method from falling weight deflection measurements provide reliable material model inputs for finite element analysis. In this study, finite element (FE) prediction models available in abaqus were implemented to simulate the rutting performance of asphalt mixture overlays under accelerated loading. A unified, three dimensional pavement section was proposed as a constitutive material model for the rutting prediction of various pavement section combinations in FE analysis. The asphalt overlay mix was treated as an elastic material and its corresponding material properties were determined from laboratory tests while falling weight deflection tests were conducted to determine the underlaying layer moduli. In general, the FE creep and elasto-viscoplastic models predicted that rutting developments match well with the MLS3 measured results. However, to perform an effective evaluation of the FE simulation analysis and obtain reliable prediction results from an MLS3 experiment, some special techniques to obtain and characterize material input parameters are deemed necessary.

Pointwise Identification of Elastic Properties in Nonlinear Hyperelastic Membranes—Part II: Experimental Validation

2009 ◽  
Vol 76 (6) ◽  
Author(s):  
Xuefeng Zhao ◽  
Xiaolin Chen ◽  
Jia Lu
Keyword(s):  
Finite Element ◽  
Elastic Properties ◽  
Three Dimensional ◽  
Material Model ◽  
Material Behavior ◽  
Reconstruction Technique ◽  
The Finite Element Method ◽  
Gauss Point ◽  
Rubber Balloon ◽  
Dimensional Reconstruction

Following the theoretical and computational developments of the pointwise membrane identification method reported in the first part of this paper, we perform a finite inflation test on a rubber balloon to validate the method. The balloon is inflated using a series of pressurized configurations, and a surface mesh that corresponds through all the deformed states is derived using a camera-based three dimensional reconstruction technique. In each configuration, the wall tension is computed by the finite element inverse elastostatic method, and the in-plane stretch relative to a slightly pressurized configuration is computed with the aid of finite element interpolation. Based on the stress-strain characteristics, the Ogden model is employed to describe the material behavior. The elastic parameters at every Gauss point in a selected region are identified simultaneously. To verify the predictive capability of the identified material model, the deformation under a prescribed pressure is predicted using the finite element method and is compared with the physical measurement. The experiment shows that the method can effectively delineate the distributive elastic properties in the balloon wall.

scholarly journals Analysis of planes within reduced micromorphic model

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
A. R. El Dhaba ◽  
S. Mahmoud Mousavi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Three Dimensional ◽  
Continuum Theory ◽  
Material Model ◽  
External Loading ◽  
The Finite Element Method ◽  
Governing System ◽  
Generalized Continuum ◽  
Element Method

AbstractA plane within reduced micromorphic model subjected to external static load is studied using the finite element method. The reduced micromorphic model is a generalized continuum theory which can be used to capture the interaction of the microstructure. In this approach, the microstructure is homogenized and replaced by a reduced micromorphic material model. Then, avoiding the complexity of the microstructure, the reduced micromorphic model is analyzed to reveal the interaction of the microstructure and the external loading. In this study, the three-dimensional formulation of the reduced micromorphic model is dimensionally reduced to address a plane under in-plane external load. The governing system of partial differential equations with corresponding consistent boundary conditions are discretized and solved using the finite element method. The classical and nonclassical deformation measures are then demonstrated and discussed for the first time for a material employing the reduced micromorphic model.

Finite Element Simulation of the Residual Stress States after Shot Peening

2006 ◽  
Vol 524-525 ◽  
pp. 349-354 ◽  
Author(s):  
Manuel Klemenz ◽  
Volker Schulze ◽  
Otmar Vöhringer ◽  
Detlef Löhe
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Finite Element Simulation ◽  
Shot Peening ◽  
Three Dimensional ◽  
Material Model ◽  
Stress Profile ◽  
Viscoplastic Material ◽  
Residual Stress Profile ◽  
Element Simulation

In a three-dimensional Finite-Element-Simulation of shot peening, a combined isotropickinematic viscoplastic material description was introduced in order to describe the cyclic softening effects during peening. After verifying the model in the simulation of push-pull tests at different strain amplitudes it could be used for the shot peening simulation. The simulated residual stress profile is compared with experimental results determined by X-ray diffraction and with simulated results of a simpler isotropic viscoplastic material model.

scholarly journals Design of an Inkjet-Printed Rotary Bellows Actuator and Simulation of its Time-Dependent Deformation Behavior

2021 ◽  
Vol 8 ◽  
Author(s):  
Gabriel Dämmer ◽  
Michael Lackner ◽  
Sonja Laicher ◽  
Rüdiger Neumann ◽  
Zoltán Major
Keyword(s):  
Finite Element ◽  
Deformation Behavior ◽  
Materials Science ◽  
Three Dimensional ◽  
Material Model ◽  
Relaxation Experiment ◽  
State Of Stress ◽  
Complex Structural ◽  
Actuator Design

State-of-the-art Additive Manufacturing processes such as three-dimensional (3D) inkjet printing are capable of producing geometrically complex multi-material components with integrated elastomeric features. Researchers and engineers seeking to exploit these capabilities must handle the complex mechanical behavior of inkjet-printed elastomers and expect a lack of suitable design examples. We address these obstacles using a pneumatic actuator as an application case. First, an inkjet-printable actuator design with elastomeric bellows structures is presented. While soft robotics research has brought forward several examples of inkjet-printed linear and bending bellows actuators, the rotary actuator described here advances into the still unexplored field of additively manufactured pneumatic lightweight robots with articulated joints. Second, we demonstrate that the complex structural behavior of the actuator’s elastomeric bellows structure can be predicted by Finite Element (FE) simulation. To this end, a suitable hyperviscoelastic material model was calibrated and compared to recently published models in a multiaxial-state-of-stress relaxation experiment. To verify the material model, Finite Element simulations of the actuator’s deformation behavior were conducted, and the results compared to those of corresponding experiments. The simulations presented here advance the materials science of inkjet-printed elastomers by demonstrating use of a hyperviscoelastic material model for estimating the deformation behavior of a prototypic robotic component. The results obtained contribute to the long-term goal of additively manufactured and pneumatically actuated lightweight robots.

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