Relevant bibliographies by topics / User-subroutine / Journal articles
To see the other types of publications on this topic, follow the link: User-subroutine.

Journal articles on the topic 'User-subroutine'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'User-subroutine.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Cao, Peng, De Cheng Feng, Hong Yan Ma, and Wen Xin Zuo. "Numerical Test of Crack Propagation Path in Asphalt Beam Using Coupled Extended Finite Element with Field Variable Method." Advanced Materials Research 250-253 (May 2011): 2754–59. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.2754.

Full text
Abstract:
Based on extended finite element coupled with field variable method, fatigue damage numerical test of three point-bending beam with initial notch has been made to predict crack propagation path, numerical results showed : under the fatigue loading with 200Hz, and amplitude is 20KN, length of crack expanding was the biggest and crack grew as some angles with the initial crack during the first loading, crack propagated parallel to the initial angle during the other loading cycle. These results can fit the experiment very well. Using Fortran, A new user subroutine named USDFILD (User subroutine to redefine field variables at a material point) was also provided on the platform of ABAQUS, which can modal the change of physic material with time. This user subroutine can also import fatigue characterize of material into the model.
APA, Harvard, Vancouver, ISO, and other styles
2

Zhou, Hong Liang. "Implementation of Crack Problem of Functionally Graded Materials with ABAQUSTM." Advanced Materials Research 284-286 (July 2011): 297–300. http://dx.doi.org/10.4028/www.scientific.net/amr.284-286.297.

Full text
Abstract:
An implementation method of the virtual crack closure technique (VCCT) for fracture problems of non-homogeneous materials such as functionally graded materials (FGMs) with commercial finite element software ABAQUSTMis introduced in this paper. In order to avoid the complex post proceeding to extract fracture parameters, the interface crack element based on the VCCT is developed. The heterogeneity of FGMs is characterized though user subroutine UMAT and the interface crack element is implemented by user subroutine UEL. Several examples are analyzed to demonstrate the accuracy of the present method.
APA, Harvard, Vancouver, ISO, and other styles
3

Jiang, Yun Peng, and Wan Lin Guo. "Modeling the Damage Progression in the Composite Structure Subjected to Static Contact Crush." Key Engineering Materials 324-325 (November 2006): 831–34. http://dx.doi.org/10.4028/www.scientific.net/kem.324-325.831.

Full text
Abstract:
Based on the classic laminate theory, a progressive damage model has been incorporated into the composite structure analysis by using a commercial code, ABAQUS, via one of its user-defined subroutine, UGENS. The developed user subroutine can be applied to simulate fiber and matrix damage processes in the general composites structures. The responses of flat laminate subjected to static contact crush have been studied to verify the efficiency of the presented damage method. The predicted load-displacement relationships, damage distribution were obtained and compared with the corresponding experiments, and the results were found to be in good agreement.
APA, Harvard, Vancouver, ISO, and other styles
4

Suchocki, Cyprian, and Stanisław Jemioło. "On Finite Element Implementation of Polyconvex Incompressible Hyperelasticity: Theory, Coding and Applications." International Journal of Computational Methods 17, no. 08 (June 28, 2019): 1950049. http://dx.doi.org/10.1142/s021987621950049x.

Full text
Abstract:
This work concerns mainly the finite element (FE) implementation of polyconvex incompressible hyperelastic models. A user material subroutine (UMAT) has been developed and can be utilized to define the aforementioned material behaviors in the FE system ABAQUS. The subroutine is written using a novel strategy in order to maximally simplify the relations for the analytical material Jacobian (MJ). The UMAT code is attached in the appendix. The developed subroutine allows to significantly decrease the time of computations and to avoid possible convergence difficulties. The structure of the code enables modifications which may lead to a rheological, damage or growth models, for instance.
APA, Harvard, Vancouver, ISO, and other styles
5

Choung, Joonmo, Sung-Won Yoon, and Sung-Ju Park. "Failure strain prediction of an arctic class marine steel (EH36) in average stress triaxiality regime." Modern Physics Letters B 29, no. 06n07 (March 20, 2015): 1540008. http://dx.doi.org/10.1142/s0217984915400084.

Full text
Abstract:
This paper introduces a procedure to predict failure strain for an arctic class marine structural steel, EH36. Based on previous results,1-4 this paper explains formulation procedure for a failure strain curve of the EH36 in medium-low and high average stress triaxiality zones by performing tensile tests for round and flat specimens with various notches. Verification of the validity of the failure strain envelope using user-defined subroutine imbedded in commercial finite element code Abaqus/Explicit is also described. The failure strain envelope provides relatively accurate simulation results by comparing tensile test results of asymmetric notch structures with fracture simulations using the user-defined subroutine.
APA, Harvard, Vancouver, ISO, and other styles
6

Roh, Jin Ho, Jae Hung Han, and In Lee. "Numerical Modeling of Shape Memory Alloy Thin Film Actuators and Their Applications." Key Engineering Materials 321-323 (October 2006): 186–91. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.186.

Full text
Abstract:
The thermomechanical behavior of SMA thin film actuator and their application are investigated. The numerical algorithm of the 2-D SMA thermomechanical constitutive equation is developed using user material (UMAT) subroutine written by FORTRAN. For the numerical results of SMA thin film, the ABAQUS finite element program has been utilized with UMAT subroutine of the numerical algorithm of SMA. The application of SMA thin film for the membrane pump actuator is demonstrated.
APA, Harvard, Vancouver, ISO, and other styles
7

Yi, Long, Yun Peng, Hou Quan Hong, and Yu Liang Li. "The Secondary Development of Nonlinear Viscoelastic Constitutive Model Based on ABAQUS." Applied Mechanics and Materials 138-139 (November 2011): 466–70. http://dx.doi.org/10.4028/www.scientific.net/amm.138-139.466.

Full text
Abstract:
Based on the subroutine VUMAT, user-defined material model in the nonlinear finite element software ABAQUS/EXPLICIT, a nonlinear viscoelastic constitutive model is developed. The validify of the subroutine has been proven through the standard uniaxial tensile model. The shortage of finite element softwares which only have linear viscoelastic constitutive model is remedied. This paper presents the process of developing a material constitutive model and some useful technology. It can be referred for extending the material constitutive model in finite element softwares.
APA, Harvard, Vancouver, ISO, and other styles
8

Kumbhar, Pramod Y., A. Francis, N. Swaminathan, R. K. Annabattula, and S. Natarajan. "Development of User Element Routine (UEL) for Cell-Based Smoothed Finite Element Method (CSFEM) in Abaqus." International Journal of Computational Methods 17, no. 02 (October 24, 2019): 1850128. http://dx.doi.org/10.1142/s0219876218501281.

Full text
Abstract:
In this paper, we discuss the implementation of a cell-based smoothed finite element method (CSFEM) within the commercial finite element software Abaqus. The salient feature of the CSFEM is that it does not require an explicit form of the derivative of the shape functions and there is no need for isoparametric mapping. This implementation is accomplished by employing the user element subroutine (UEL) feature in Abaqus. The details on the input data format together with the proposed user element subroutine, which forms the core of the finite element analysis are given. A few benchmark problems from linear elastostatics in both two and three dimensions are solved to validate the proposed implementation. The developed UELs and the associated input files can be downloaded from https://github.com/nsundar/SFEM_in_Abaqus .
APA, Harvard, Vancouver, ISO, and other styles
9

Kim, Dong Wook, Hyun Kyu Jun, Sang Hwan Lee, and Yoon Suk Chang. "Residual Stress Analysis of Repair Welded Rail Using the ABAQUS User Subroutine." Journal of the Korean Society for Precision Engineering 33, no. 7 (July 1, 2016): 551–58. http://dx.doi.org/10.7736/kspe.2016.33.7.551.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Guo, Y. B., A. Klink, and F. Klocke. "Multiscale Modeling of Sinking-EDM with Gaussian Heat Flux via user Subroutine." Procedia CIRP 6 (2013): 438–43. http://dx.doi.org/10.1016/j.procir.2013.03.047.

Full text
APA, Harvard, Vancouver, ISO, and other styles
11

Peeken, Heinz, Reinhold Döpper, and Bruno Orschall. "A 3-D rubber material model verified in a user-supplied subroutine." Computers & Structures 26, no. 1-2 (January 1987): 181–89. http://dx.doi.org/10.1016/0045-7949(87)90248-3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
12

Lim, Hyean-Ho, Ho-Young Kim, and Hyun-Gyu Kim. "Development of an Abaqus User Element (UEL) Subroutine for Trimmed Hexahedral Elements." Transactions of the Korean Society of Mechanical Engineers - A 45, no. 4 (April 30, 2021): 329–38. http://dx.doi.org/10.3795/ksme-a.2021.45.4.329.

Full text
APA, Harvard, Vancouver, ISO, and other styles
13

Zhang, Quanwu, Zhiguo Shi, Jiazeng Shan, and Weixing Shi. "Secondary Development and Application of Bio-Inspired Isolation System." Sustainability 11, no. 1 (January 8, 2019): 278. http://dx.doi.org/10.3390/su11010278.

Full text
Abstract:
Near-fault pulse motions will cause excessive and much larger base displacement in traditional isolated structures than common earthquake motions. The new isolation system inspired by the “sacrificial bonds and hidden length” biomechanics of an abalone shell can control the base displacement efficiently and reach almost the same vibration isolation efficiency as a semi-active control system. The current research is confined to the lumped mass model and cannot uncover the exact performance of isolators and structures in practical applications. A user subroutine is developed based on the interface of UEL in Abaqus. Subsequent verification has been done in both the lumped mass model and 3D complex model with Abaqus, Matlab/Simulink, and SAP2000. It can be revealed from the comparative results that the calculation accuracy of the secondary developed user subroutine can meet the demand of design and research.
APA, Harvard, Vancouver, ISO, and other styles
14

Qin, Shenghuan, Zaiyin Xiong, Yingsong Ma, and Keshi Zhang. "Low Cycle Fatigue Life Evaluation of Notched Specimens Considering Strain Gradient." Materials 13, no. 4 (February 23, 2020): 1001. http://dx.doi.org/10.3390/ma13041001.

Full text
Abstract:
An improved model based on the Chaboche constitutive model is proposed for cyclic plastic behavior of metal and low cycle fatigue of notched specimens under cyclic loading, considering the effect of strain gradient on nonlinear kinematic hardening and hysteresis behavior. The new model is imported into the user material subroutine (UMAT) of the finite element computing software ABAQUS, and the strain gradient parameters required for model calculation are obtained by calling the user element subroutine (UEL). The effectiveness of the new model is tested by the torsion test of thin copper wire. Furthermore, the calibration method of strain gradient influence parameters of constitutive model is discussed by taking the notch specimen of Q235 steel as an example. The hysteresis behavior, strain distribution and fatigue failure of notched specimens under cyclic loading were simulated and analyzed with the new model. The results prove the rationality of the new model.
APA, Harvard, Vancouver, ISO, and other styles
15

Shao, Xiao Jun, and Zhu Feng Yue. "Compressive Experiment and Damage Simulation of a Composite Structure with Ply Drop-Off." Key Engineering Materials 334-335 (March 2007): 301–4. http://dx.doi.org/10.4028/www.scientific.net/kem.334-335.301.

Full text
Abstract:
Compressive experiments and finite element method (FEM) have been used to study the mechanical behavior of composite laminate with plies drop-off. A user subroutine has been implemented to ABAQUS to simulate the damage development of the laminate plate. This user subroutine has taken consideration of the mechanical properties degradation according to development of three types of damage. The load-strain curves can agree with each other between experiments and FEM. The detail of damage development of the plies drop-off composite laminate under compressive loading can be described as followed. Matrix cracking damage and fiber-matrix shearing damage occur simultaneously at first, and then fiber buckling damage initiates. Matrix cracking and fiber-matrix shearing are very dangerous to the carrying capacity of laminate and fiber buckling intensifies further this effect. The initiation and development of fiber buckling indicates that laminate loses carrying capacity at all.
APA, Harvard, Vancouver, ISO, and other styles
16

Mananghaya, Michael Rivera. "Titanium-decorated boron nitride nanotubes for hydrogen storage: a multiscale theoretical investigation." Nanoscale 11, no. 34 (2019): 16052–62. http://dx.doi.org/10.1039/c9nr04578c.

Full text
Abstract:
A multiscale computational technique from available quantum mechanical and Molecular Dynamics (MD) codes to user-subroutine computational fluid dynamics (CFD) files was applied to the H2 adsorption of Ti-decorated (10,0) single-walled BN nanotubes (BNNTs) with B–N defects.
APA, Harvard, Vancouver, ISO, and other styles
17

Uemori, Takeshi, Hiroshi Miyake, Tetsuo Naka, Michihiro Takiguchi, and Fusahito Yoshida. "Finite Element Analysis of High Tensile Strength Steel Sheet by Using Complex Step Derivative Approximations." Key Engineering Materials 626 (August 2014): 187–92. http://dx.doi.org/10.4028/www.scientific.net/kem.626.187.

Full text
Abstract:
The framework for the complex step derivative approximations (hereafter CDSA) to calculate the consistent tangent moduli is studied. The present methods is one of the most effective methods to implement any material constitutive equations to the commercial finite element codes and does not suffer from calculation conditions and errors. In order to confirm the efficiency of CDSA, we developed the user subroutine code based on the CDSA using associative J2 flow rules with general nonlinear isotropic hardening rules that is commonly and widely utilized in commercial finite element codes. In this study, the user material subroutine ‘Hypela2’ of MSC.Marc (ver.2013.0.0) was utilized. The finite element calculation result by the proposal method shows a good agreement with the corresponding result by the MSC.Marc default setting. Also we apply the Yoshida-Uemori back stress model to the CDSA and evaluate this new technique to predict the deformation behavior of high tensile strength steel sheet.
APA, Harvard, Vancouver, ISO, and other styles
18

Caruso, Serafino, Serena Di Renzo, Domenico Umbrello, Anshu Dhar Jayal, O. W. Dillon, and I. S. Jawahir. "Finite Element Modeling of Microstructural Changes in Hard Turning." Advanced Materials Research 223 (April 2011): 960–68. http://dx.doi.org/10.4028/www.scientific.net/amr.223.960.

Full text
Abstract:
The material grain size changes significantly during machining of hardened steels, and this must be taken into account for improved modeling of surface integrity effects resulting from machining. Grain size changes induced during orthogonal cutting of hardened AISI 52100 (62 HRC) are modeled using the Finite Element (FE) method; in particular, a user subroutine involving a hardness-based flow stress model is implemented in the FE code and empirical models are utilized for describing the phase transformation conditions to simulate formation of white and dark layers. Furthermore, a procedure utilizing the Zener-Hollomon relationship is implemented in the above-mentioned user subroutine to predict the evolution in material grain size at different cutting speeds (300, 600, 900 SFPM). All simulations were performed for dry cutting conditions using a low CBN-content insert (Kennametal KD050 grade, ANSI TNG-432 geometry). The model is validated by comparing the predicted results with experimental evidence available in the literature.
APA, Harvard, Vancouver, ISO, and other styles
19

Kim, Jeong-Hyeon, Seul-Kee Kim, Myung-Soo Kim, and Jae-Myung Lee. "Numerical Simulation of Membrane of LNG Insulation System using User Defined Material Subroutine." Journal of the Computational Structural Engineering Institute of Korea 27, no. 4 (August 30, 2014): 265–71. http://dx.doi.org/10.7734/coseik.2014.27.4.265.

Full text
APA, Harvard, Vancouver, ISO, and other styles
20

Zhou, Chilou, Mohan He, Guohua Chen, and Saihua Jiang. "Numerical study on sealing characteristic of rubber X-ring exposed to high-pressure hydrogen by considering swelling effect." Industrial Lubrication and Tribology 71, no. 1 (January 14, 2019): 133–38. http://dx.doi.org/10.1108/ilt-02-2018-0067.

Full text
Abstract:
Purpose This paper aims to investigate the sealing characteristic of the rubber X-ring combined seal used in high-pressure hydrogen service and clarify the effect of swelling due to dissolved hydrogen on the sealing behavior. Design/methodology/approach A finite element analysis method with a user subroutine is proposed to investigate the sealing characteristic of rubber X-ring seals in conjunction with the swelling effect. Findings The swelling has a noticeable impact on the sealing behavior. The higher peak contact stress suggests that the X-ring seal may be superior to the O-ring seal, while the calculated increase in Mises stress suggests the X-ring exhibits a higher propensity to mechanical damage under low pressure conditions. Originality/value This paper describes a method with a user subroutine developed within ABAQUS to simulate the sealing performance coupled hydrogen swelling. The suitability of X-ring seals is evaluated. This work provides insight into the swelling effect on sealing behavior of an X-ring, which is of great value for the design and application of rubber seals used in hydrogen service.
APA, Harvard, Vancouver, ISO, and other styles
21

Song, Shin-Hyung, and Woo Chun Choi. "Crystallographic effects during micromachining — A finite-element model." Modern Physics Letters B 29, no. 22 (August 20, 2015): 1550119. http://dx.doi.org/10.1142/s0217984915501195.

Full text
Abstract:
Mechanical micromachining is a powerful and effective way for manufacturing small sized machine parts. Even though the micromachining process is similar to the traditional machining, the material behavior during the process is much different. In particular, many researchers report that the basic mechanics of the work material is affected by microstructures and their crystallographic orientations. For example, crystallographic orientations of the work material have significant influence on force response, chip formation and surface finish. In order to thoroughly understand the effect of crystallographic orientations on the micromachining process, finite-element model (FEM) simulating orthogonal cutting process of single crystallographic material was presented. For modeling the work material, rate sensitive single crystal plasticity of face-centered cubic (FCC) crystal was implemented. For the chip formation during the simulation, element deletion technique was used. The simulation model is developed using ABAQUS/explicit with user material subroutine via user material subroutine (VUMAT). Simulations showed that variation of the specific cutting energy at different crystallographic orientations of work material shows significant anisotropy. The developed FEM model can be a useful prediction tool of micromachining of crystalline materials.
APA, Harvard, Vancouver, ISO, and other styles
22

Khurshid, Ajab. "The Application of Micromechanical Modeling to Study the Non-Linear Behavior of Flexible Pavement under Truck Loading in Pakistan." International Journal for Research in Applied Science and Engineering Technology 9, no. 9 (September 30, 2021): 923–32. http://dx.doi.org/10.22214/ijraset.2021.37975.

Full text
Abstract:
Abstract: This report presents the work done to create a 3D model of a pavement structure, which incorporates in a most accurately way non damaging effects of asphalt layer considering the different layers that compose the pavement structure. A series of approaches have been considered from linear viscoelastic modelling using Maxwell model via UMAT subroutine to integrated viscoelastic response using Prony series available in the built in ABAQUS material library. During this work also other effects have been considered including the viscoelastic behaviour caused by creep, which is included via a separate CREEP subroutine. In order to predict also the non-linear effect of viscous elastic response the well-known Schapery's nonlinear viscoelastic constitutive model was considered. Implementing 3D Schapery’s model can be done by using again user material subroutine UMAT. It was found that the use of a nonlinear viscoelastic model substantially transformed the pavement response. A series of python scripts have been developed to create a multi-step analysis to simulate a cyclic loading application. Keywords: Viscoelasticity, Abaqus. Asphalt, Damage, Simulation, Modelling, Pavement design
APA, Harvard, Vancouver, ISO, and other styles
23

Chen, Cong Sheng, Xue Hui Chen, Lei Huang, Jing Fa Lei, and Ping He. "Numerical Simulations of Uniaxial Tension Behaviour of Aluminum Single Crystal by Crystal Plasticity Finite Element Method." Advanced Materials Research 774-776 (September 2013): 1006–9. http://dx.doi.org/10.4028/www.scientific.net/amr.774-776.1006.

Full text
Abstract:
Based on the rate-dependent crystal plasticity theory, the user material subroutine is embedded into the abaqus / standard, which is able to describe the changes of grain orientation. The crystal plasticity finite element method is used to simulate the aluminum single crystal uniaxial tension and the stress and strain response is analyzed under different tension displacement.
APA, Harvard, Vancouver, ISO, and other styles
24

Han, Donghwa, Kwang-Jun Paik, Seong-Yeop Jeong, and Joonmo Choung. "Ice Floe-induced Ship Resistances using Explicit Finite Element Analyses with a User-subroutine." Journal of the Society of Naval Architects of Korea 57, no. 2 (April 20, 2020): 88–95. http://dx.doi.org/10.3744/snak.2020.57.2.088.

Full text
APA, Harvard, Vancouver, ISO, and other styles
25

Chen, Xiao Hui, and Xu Chen. "Numerical Simulations of Pressurized Elbow under Reversed In-Plane Bending." Advanced Materials Research 785-786 (September 2013): 16–19. http://dx.doi.org/10.4028/www.scientific.net/amr.785-786.16.

Full text
Abstract:
The paper compares numerical simulation with experimental results of pressurized elbow piping subjected to reversed in-plane bending in elastoplastic domain. The modified AbdelKarim-Ohno model is implemented into finite element program ANSYS by writing own user subroutine in FORTRAN language. The modified AbdelKarim-Ohno model may improve the prediction accuracy of ratcheting behavior of pressurized elbow under cyclic loading.
APA, Harvard, Vancouver, ISO, and other styles
26

Chen, Liu Ding, Xiao Yan Tong, Xiang Zheng, and Lei Jiang Yao. "Progressive Damage Approach to Simulating Low Velocity Impact Response of Plain Weave C/SiC Composites." Advanced Materials Research 118-120 (June 2010): 241–45. http://dx.doi.org/10.4028/www.scientific.net/amr.118-120.241.

Full text
Abstract:
Based on progressive damage theory, a 3D laminated model with an orthotropic property in plane was established to simulate the response of plain weave carbon fiber reinforced silicon carbide(C/SiC) ceramic matrix composites(CMC) under low velocity impact(LVI). Intra-layer damage and inter-layer damage were taken into account, respectively. Three scalar damage variables, associated with the degradation of warp modulus, weft modulus and shear modulus, respectively, were proposed to characterize intra-layer damage evolutions. The intra-layer constitutive model was implemented into MSC.Dytran, via its user subroutine EXFAIL1. The potential delamination region was considered as a discrete cohesive zone. Three vector spring elements were placed into every two adjacent nodes to simulate the inter-layer joints. A scalar damage variables, associated with the degradation of the three vector spring elements, were brought forward to characterize the inter-layer damage evolutions. The inter-layer constitutive model was implemented into MSC.Dytran, via its user subroutine EXELAS. Damage area, indentation depth of C/SiC composite plates and time history of impact force were obtained to compare with experimental results. The numerical results show overall good agreement with experimental results.
APA, Harvard, Vancouver, ISO, and other styles
27

Nguyen, Van, Jörg Dietrich, Bhumika Uniyal, and Dang Tran. "Verification and Correction of the Hydrologic Routing in the Soil and Water Assessment Tool." Water 10, no. 10 (October 10, 2018): 1419. http://dx.doi.org/10.3390/w10101419.

Full text
Abstract:
The Soil and Water Assessment Tool (SWAT) is one of the most widely used eco-hydrological models. SWAT has been undergoing constant changes since its development. However, compartment review and testing of SWAT, especially the hydrologic routing functions, are comparably limited. In this study, the daily hydrologic routing subroutines of different SWAT versions were reviewed and tested using a well observed segment of the Weser River located in Germany. Results show several problems with the routing subroutines of SWAT. The variable storage subroutine of SWAT (Revision 664) does not transform the stream flow. Unphysical results could be obtained with the variable storage routing of SWAT (Revision 528). The Muskingum subroutine of SWAT (Revisions 664 and 528) overestimates daily channel evaporation (resulting in a bias of up to 6.3% in streamflow in our case studies) and underestimates daily transmission losses. Simulated results show that the timing and shape of flood waves, as well as the volume of low flows, could be improved with a corrected Muskingum subroutine. Based on the results of this study, we suggest that the SWAT user community review their existing SWAT models to see how the aforementioned issues will affect their methods, findings, and conclusions.
APA, Harvard, Vancouver, ISO, and other styles
28

Wang, Wenming. "Strain Rate Effect on the Progressive Collapse Analysis of RC Frame Structure under Earthquake." Advances in Civil Engineering 2020 (January 22, 2020): 1–12. http://dx.doi.org/10.1155/2020/5808701.

Full text
Abstract:
The strain rate effect can influence the seismic responses of reinforced concrete (RC) structures because the constitutive relationship of concrete and rebar is rate-dependent. This paper carries out progressive collapse analysis to research the influence of strain rate effects on collapse-resistant capacity, collapse mode, and collapse path of the RC frame structure. A progressive collapse simulation program for the reinforced concrete (RC) structure with a static and dynamic constitutive relationship is coded individually using the user subroutine VUMAT and then implemented in the advanced finite element program ABAQUS. The good agreement between experimental and simulation results proves that the coded subroutine is reliable. With the coded subroutine, by conducting progressive collapse analyses of a four-story RC frame structure under earthquake, the effect of strain rate on the response is investigated. The numerical results demonstrate that the collapse-resistant capacity of the structure is underestimated when the strain rate effect is neglected. It is shown that strain rate effects influence the collapse mode and collapse path of the structure. Therefore, strain rate effects should be considered in the progressive collapse analysis of the RC frame structure.
APA, Harvard, Vancouver, ISO, and other styles
29

Šebek, František, Petr Kubík, and Jindřich Petruška. "Application of Coupled Ductile Fracture Criterion to Plane Strain Plates." Defect and Diffusion Forum 382 (January 2018): 186–90. http://dx.doi.org/10.4028/www.scientific.net/ddf.382.186.

Full text
Abstract:
The paper presents a complex material model which covers the elastic-plastic behavior, material deterioration and ductile fracture. The calibration of such model was conducted for Aluminum Alloy (AA) 2024-T351 using specimens with various geometries and loading which covers various stress states. The model was then applied to the simulations of tensile test of plates. The computations were carried out in Abaqus/Explicit using the user subroutine Vectorized User MATerial (VUMAT), where the crack initiation and subsequent propagation was realized using the element deletion technique. The results were compared to the experimental observation in the end.
APA, Harvard, Vancouver, ISO, and other styles
30

Lovrenić-Jugović, Martina, Zdenko Tonković, and Ivica Skozrit. "Numerical Modelling of Viscoelastic/Damage Behaviour of Cortical Bone." Key Engineering Materials 417-418 (October 2009): 273–76. http://dx.doi.org/10.4028/www.scientific.net/kem.417-418.273.

Full text
Abstract:
An efficient computational algorithm for the integration of the viscoelastic/damage constitutive model at the material point level is derived. For the presented constitutive model, material parameters, obtained experimentally for human cortical bone, are taken from literature. The derived algorithm in conjunction with the Jacobian matrix is implemented in the finite element (FE) code ABAQUS by using the user subroutine UMAT. The accuracy of the proposed algorithm is demonstrated.
APA, Harvard, Vancouver, ISO, and other styles
31

Skozrit, Ivica, and Zdenko Tonković. "On Numerical Analysis of Creep Fracture Behaviour of Medium Density Polyethylene." Key Engineering Materials 417-418 (October 2009): 233–36. http://dx.doi.org/10.4028/www.scientific.net/kem.417-418.233.

Full text
Abstract:
An implicit numerical algorithm for the integration of the primary/secondary creep constitutive law at the material point level is derived. For the presented constitutive model, the experimentally obtained material parameters for the medium density polyethylene (MDPE) are taken from literature. The derived algorithm in conjunction with the Jacobian matrix is implemented in the finite element (FE) code ABAQUS by using the user subroutine CREEP. The accuracy of the proposed algorithm is demonstrated.
APA, Harvard, Vancouver, ISO, and other styles
32

Mars, Jamel, Lotfi Ben Said, Mondher Wali, and Fakhreddine Dammak. "Elasto-Plastic Modeling of Low-Velocity Impact on Functionally Graded Circular Plates." International Journal of Applied Mechanics 10, no. 04 (May 2018): 1850038. http://dx.doi.org/10.1142/s1758825118500382.

Full text
Abstract:
Low-velocity impact of elasto-plastic functionally graded material (FGM) plates is first investigated in this paper based on Mori–Tanaka model to underline micromechanics and locally determine the effective FGM properties and self-consistent method of Suquet for the homogenization of the stress-field. The elasto-plastic behavior of the particle reinforced metal matrix FGM plate is assumed to follow Ludwik hardening law. An incremental formulation of the elasto-plastic constitutive relation is developed to predict the tangent operator. The homogenization formulation and numerical algorithms are implemented into ABAQUS/Standard via a user material subroutine (UMAT) and USDFLD subroutine. The effect of the power-law index on low-velocity impact parameters like contact force, deflection, permanent indentation, velocity distribution and the kinetic energy are examined using the proposed method. With the aim of demonstrating the accuracy and efficiency of the present method, current numerical results are compared to experimental and theoretical results from the literature and show very good agreement.
APA, Harvard, Vancouver, ISO, and other styles
33

Wardak, Abdullah A. "Interfacing C and TMS320C6713 Assembly Language (Part II)." WSEAS TRANSACTIONS ON COMPUTERS 20 (April 27, 2021): 74–81. http://dx.doi.org/10.37394/23205.2021.20.9.

Full text
Abstract:
In this paper, an interfacing of C and the assembly language of TMS320C6713 is presented. Similarly, interfacing of C with the assembly language of Motorola 68020 (MC68020) microprocessor is also presented for comparison. However, it should be noted that the way the C compiler passes arguments from the main function in C to the TMS320C6713 assembly language subroutine is totally different from the way the C compiler passes arguments in a conventional microprocessor such as MC68020. Therefore, it is very important for a user of the TMS320C6713-based system to properly understand and follow the register conventions and stack operation when interfacing C with the TMS320C6713 assembly language subroutine. This paper describes the application of special registers and stack in the interfacing of these programming languages. Working examples of C and their implementation in the TMS320C6713 assembly language are described in detail. Finally, the concept presented in this paper has been tested extensively by examining different examples under various conditions and has proved highly reliable in operation.
APA, Harvard, Vancouver, ISO, and other styles
34

Liu, Wen Lin, Da Zhao Yu, and Zhong Hu Jia. "Comparative Analysis of Crack Growth Characteristics Based on Virtual Crack Closure Technique." Applied Mechanics and Materials 633-634 (September 2014): 59–62. http://dx.doi.org/10.4028/www.scientific.net/amm.633-634.59.

Full text
Abstract:
The strain energy rate and the stress intensity factors in different crack growth stage were analyzed by virtual crack closure technique. The user subroutine is complied using Abaqus finite element software. The finite element model of crack growth was established by the Paris formula, then the fatigue crack growth process is simulated, the crack growth life is predicted. The method could be a powerful tool for engineers to study the fracture and fatigue problems in engineering structures.
APA, Harvard, Vancouver, ISO, and other styles
35

Wan, Yun, Xin Lei Huang, and Li Min Zhou. "Parameter Study of Numerical Analysis on Low-Velocity Impact of GLARE 5 Fibre-Metal Laminates." Advanced Materials Research 1033-1034 (October 2014): 515–18. http://dx.doi.org/10.4028/www.scientific.net/amr.1033-1034.515.

Full text
Abstract:
The impact performance play an important role to marine material. A numerical methodology including user material subroutine VUMAT, Johnson–Cook flow stress model and surface-based cohesive behaviour is employed to simulate the damage of the impact of GLARE 5 fibre-metal laminates (FML). Not only histories of absorbed energy, deflection, contact force are presented in our simulation, but the interface delamination is also investigated. After parameter study, suitable fracture energy in surface-based cohesive behaviour was found.
APA, Harvard, Vancouver, ISO, and other styles
36

Fansi, Joseph, Mohamed Ben Bettaieb, Tudor Balan, Xavier Lemoine, and Anne Marie Habraken. "Notched Specimens Fracture Prediction with an Advanced GTN Model." Key Engineering Materials 488-489 (September 2011): 77–80. http://dx.doi.org/10.4028/www.scientific.net/kem.488-489.77.

Full text
Abstract:
This present contribution consists of implementing an advanced GTN damage model as a "User Material subroutine" in the Abaqus FE code. This damage model is based on specific nucleation and growth laws in order to predict the void coalescence properties of the material. When applied, this implementation predicts the damage evolution and the stress state of notched specimens made from dual phase steel. By comparing numerical predictions with experimental results, the numerical approach was improved and then validated.
APA, Harvard, Vancouver, ISO, and other styles
37

Navidtehrani, Yousef, Covadonga Betegón, and Emilio Martínez-Pañeda. "A Unified Abaqus Implementation of the Phase Field Fracture Method Using Only a User Material Subroutine." Materials 14, no. 8 (April 11, 2021): 1913. http://dx.doi.org/10.3390/ma14081913.

Full text
Abstract:
We present a simple and robust implementation of the phase field fracture method in Abaqus. Unlike previous works, only a user material (UMAT) subroutine is used. This is achieved by exploiting the analogy between the phase field balance equation and heat transfer, which avoids the need for a user element mesh and enables taking advantage of Abaqus’ in-built features. A unified theoretical framework and its implementation are presented, suitable for any arbitrary choice of crack density function and fracture driving force. Specifically, the framework is exemplified with the so-called AT1, AT2 and phase field-cohesive zone models (PF-CZM). Both staggered and monolithic solution schemes are handled. We demonstrate the potential and robustness of this new implementation by addressing several paradigmatic 2D and 3D boundary value problems. The numerical examples show how the current implementation can be used to reproduce numerical and experimental results from the literature, and efficiently capture advanced features such as complex crack trajectories, crack nucleation from arbitrary sites and contact problems. The code developed is made freely available.
APA, Harvard, Vancouver, ISO, and other styles
38

Li, Han, Nasidan Wang, Xuefei Han, Baoxin Fan, Zhenyu Feng, and Shijun Guo. "Simulation of Thermal Behavior of Glass Fiber/Phenolic Composites Exposed to Heat Flux on One Side." Materials 13, no. 2 (January 16, 2020): 421. http://dx.doi.org/10.3390/ma13020421.

Full text
Abstract:
A 3D thermal response model is developed to evaluate the thermal behavior of glass fiber/phenolic composite exposed to heat flux on one side. The model is built upon heat transfer and energy conservation equations in which the heat transfer is in the form of anisotropic heat conduction, absorption by matrix decomposition, and diffusion of gas. Arrhenius equation is used to characterize the pyrolysis reaction of the materials. The diffusion equation for the decomposition gas is included for mass conservation. The temperature, density, decomposition degree, and rate are extracted to analyze the process of material decomposition, which is implemented by using the UMATHT (User subroutine to define a material’s thermal behavior) and USDFLD (User subroutine to redefine field variables) subroutines via ABAQUS code. By comparing the analysis results with experimental data, it is found that the model is valid to simulate the evolution of a glass fiber/phenolic composite exposed to heat flux from one side. The comparison also shows that longer time is taken to complete the pyrolysis reaction with increasing depth for materials from the numerical simulation, and the char region and the pyrolysis reaction region enlarge further with increasing time. Furthermore, the decomposition degree and temperature are correlated with depths, as well as the peak value of decomposition rate and the time to reach the peak value.
APA, Harvard, Vancouver, ISO, and other styles
39

Maleki-Bigdeli, Mohammad-Ali, Majid Baniassadi, Kui Wang, and Mostafa Baghani. "Developing a beam formulation for semi-crystalline two-way shape memory polymers." Journal of Intelligent Material Systems and Structures 31, no. 12 (May 30, 2020): 1465–76. http://dx.doi.org/10.1177/1045389x20924837.

Full text
Abstract:
In this research, the bending of a two-way shape memory polymer beam is examined implementing a one-dimensional phenomenological macroscopic constitutive model into Euler–Bernoulli and von-Karman beam theories. Since bending loading is a fundamental problem in engineering applications, a combination of bending problem and two-way shape memory effect capable of switching between two temporary shapes can be used in different applications, for example, thermally activated sensors and actuators. Shape memory polymers as a branch of soft materials can undergo large deformation. Hence, Euler–Bernoulli beam theory does not apply to the bending of a shape memory polymer beam where moderate rotations may occur. To overcome this limitation, von-Karman beam theory accounting for the mid-plane stretching as well as moderate rotations can be employed. To investigate the difference between the two beam theories, the deflection and rotating angles of a shape memory polymer cantilever beam are analyzed under small and moderate deflections and rotations. A semi-analytical approach is used to inspect Euler–Bernoulli beam theory, while finite-element method is employed to study von-Karman beam theory. In the following, a smart structure is analyzed using a prepared user-defined subroutine, VUMAT, in finite-element package, ABAQUS/EXPLICIT. Utilizing generated user-defined subroutine, smart structures composed of shape memory polymer material can be analyzed under complex loading circumstances through the two-way shape memory effect.
APA, Harvard, Vancouver, ISO, and other styles
40

Futamura, S., and A. Goldstein. "A Simple Method of Handling Thermomechanical Coupling for Temperature Computation in a Rolling Tire." Tire Science and Technology 32, no. 2 (April 1, 2004): 56–68. http://dx.doi.org/10.2346/1.2186774.

Full text
Abstract:
Abstract The thermomechanical analysis of a pneumatic tire is a highly complex process due to the effects of temperature on both the mechanical state and the viscoelastic energy dissipation in the tire. This coupled thermomechanical behavior typically requires that rolling tire temperatures be determined iteratively. As a result, a steady-state analysis involves updating the temperature dependent elastic and viscoelastic properties as the solution proceeds. The process is further complicated in a non-steady-state analysis where material properties need to be updated at multiple intervals in time. A simplified method is proposed. First, the sensitivity of the tire elastic response of the tire to changes in material stiffness is characterized using the “deformation index”. Then, using a commercial finite element program and an appropriate user subroutine, heat generation is expressed as a function of the local temperature using a simple algebraic expression involving the temperature dependent material properties and the deformation indices. Temperatures are computed using the finite element program with the coupling information contained in the user subroutine. The result is a simplified method for a fully coupled thermomechanical analysis of a tire for steady-state and transient thermal analysis. The accuracy and the simplicity of the method are demonstrated using a small “tire-like” model. The simplified method is compared to the fully coupled iterative method for a steady-state thermal solution.
APA, Harvard, Vancouver, ISO, and other styles
41

Chen, Xiao Hui, and Xu Chen. "Ratcheting Study of Pressurized Straight Z2CND18.12N Austenitic Stainless Steel Pipe under Reversed Bending." Advanced Materials Research 798-799 (September 2013): 235–38. http://dx.doi.org/10.4028/www.scientific.net/amr.798-799.235.

Full text
Abstract:
The current paper reports the results of a numerical simulation and experiment of ratcheting behavior of pressurized straight pipe under reversed bending. A nonlinear isotropic/ kinematic (combined) hardening model is implemented into finite element program ANSYS by writing own user subroutine in FORTRAN language. The results of the numerical simulation is compared with experimental data. A reasonable agreement is noticed between the experimental and the numerical results for the ratcheting behavior of the pressurized straight pipe subjected to reversed bending.
APA, Harvard, Vancouver, ISO, and other styles
42

Mehrabi, Reza, Mahmoud Kadkhodaei, and Abbas Ghaei. "Numerical Implementation of a Thermomechanical Constitutive Model for Shape Memory Alloys Using Return Mapping Algorithm and Microplane Theory." Advanced Materials Research 516-517 (May 2012): 351–54. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.351.

Full text
Abstract:
In this work, a return mapping algorithm is utilized to implement the model into a finite element program and then Microplane theory is employed. A numerical procedure is also developed to implement the model as a user material subroutine for ABAQUS-Standard commercial code. Uniaxial tension test under a constant axial stress is simulated in order to study the behavior of shape memory alloys. A very good agreement is seen between the results obtained by the two approaches indicating the capability of microplane theory.
APA, Harvard, Vancouver, ISO, and other styles
43

Tang, Wen Xian, Jian Zhang, and Bao Ma. "Prediction of Resin Thermal Behavior during Curing Process Based on Kamal-Ryan Model." Key Engineering Materials 474-476 (April 2011): 137–42. http://dx.doi.org/10.4028/www.scientific.net/kem.474-476.137.

Full text
Abstract:
This paper was devoted to the numerical simulation the resin curing process. Anisotropic conduction was considered in the model. And Kamal-Ryan model was used to describe the curing kinetics of the resin. The general purpose finite element code ABAQUS was used in conjunction with its user subroutine UMATHT to solve the heat conduction equation and the kinetic model, simultaneously. Then corresponding experiment was carried out to validate the model. Finally, rate-of-cure, temperature and state-of-cure were analyzed during the curing process.
APA, Harvard, Vancouver, ISO, and other styles
44

Wang, Wen Ping, Min Wan, Hai Bo Wang, Xiang Dong Wu, and Ke Shan Diao. "Consititutive Modeling for Auto-Body Steel Sheet Incorporating Strain Rate and Temperature." Advanced Materials Research 189-193 (February 2011): 2925–29. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.2925.

Full text
Abstract:
Uniaxile tensile tests of auto-body steel sheet were performed at strain rate of 10-4 to 101s-1 and temperature of room temperature to 180°C. Strain rate and temperature sensitivity of flow stress were analyzed. It is found that the stress-strain curve is obviously heavily weighted on the temperature and strain rate. A new constitutive model was constructed and implemented into Abaqus/Explicit commercial software using user subroutine VUMAT. Verification of constitutive model shows that it has good agreement with experimental result.
APA, Harvard, Vancouver, ISO, and other styles
45

Sang, Jian Bing, Su Fang Xing, Xiao Lei Li, and Jie Zhang. "Nonlinear Finite Element Analysis of Crack Tip of Rubber-Like Material." Key Engineering Materials 353-358 (September 2007): 1013–16. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.1013.

Full text
Abstract:
It has been well known that rubber-like material can undergo large deformation and exhibit large nonlinear elastic behavior. Because of the geometrically nonlinear of rubber like material, it is more difficult to analyze it with finite element near the notch tip. What is more, because there are varieties of the strain energy functions, implementation of these models in a general finite element program to meet the need of industry applications can be time consuming. In order to make use of the constitutive equation of Y.C. Gao in 1997 and analyze the notch tip of rubber-like material, a framework to implement the rubber-like material model is established within the general-purpose finite element program MSC.Marc. It will be very convenient to implement this isotropic hyperelastic model into the program with a user subroutine. This paper starts with the theoretical analysis based on the strain energy function given by Y.C. Gao in 1997. A user subroutine is programmed to implement this strain energy function into the program of MSC.Marc, which offer a convenient method to analyze the stress and strain of rubber-like material with the strain energy function that is needed. Though analysis with MSC.Marc, it is found that the result with finite element is consistent with the analytical result that given by Y.C. Gao in 1997, which testify that analyzing rubber like material with this method is reasonable and convenient.
APA, Harvard, Vancouver, ISO, and other styles
46

YAO, JUN, YUFENG YAO, ANTONINO ARINI, STUART MCIIWAIN, and TIMOTHY GORDON. "MODELLING AIR AND WATER TWO-PHASE ANNULAR FLOW IN A SMALL HORIZONTAL PIPE." International Journal of Modern Physics: Conference Series 42 (January 2016): 1660158. http://dx.doi.org/10.1142/s2010194516601587.

Full text
Abstract:
Numerical simulation using computational fluid dynamics (CFD) has been carried out to study air and water two-phase flow in a small horizontal pipe of an inner diameter of 8.8mm, in order to investigate unsteady flow pattern transition behaviours and underlying physical mechanisms. The surface liquid film thickness distributions, determined by either wavy or full annular flow regime, are shown in reasonable good agreement with available experimental data. It was demonstrated that CFD simulation was able to predict wavy flow structures accurately using two-phase flow sub-models embedded in ANSYS-Fluent solver of Eulerian–Eulerian framework, together with a user defined function subroutine ANWAVER-UDF. The flow transient behaviours from bubbly to annular flow patterns and the liquid film distributions revealed the presence of gas/liquid interferences between air and water film interface. An increase of upper wall liquid film thickness along the pipe was observed for both wavy annular and full annular scenarios. It was found that the liquid wavy front can be further broken down to form the water moisture with liquid droplets penetrating upwards. There are discrepancies between CFD predictions and experimental data on the liquid film thickness determined at the bottom and the upper wall surfaces, and the obtained modelling information can be used to assist further 3D user defined function subroutine development, especially when CFD simulation becomes much more expense to model full 3D two-phase flow transient performance from a wavy annular to a fully developed annular type.
APA, Harvard, Vancouver, ISO, and other styles
47

Mashalkar, Anil, and Vilas Nandedkar. "Effect of crystallographic texture on the forming limit in microforming of brass." Manufacturing Review 6 (2019): 27. http://dx.doi.org/10.1051/mfreview/2019024.

Full text
Abstract:
Microforming is an emerging technology to manufacture products in the light of miniaturization in several domains of industry. Plastic anisotropy is one of the material characteristics significantly affecting the micro forming process. The crystal orientation influences tensile strength, yield strength and ductility, depending on different grain sizes and principle sliding planes. The present work elaborates on the influence of the plastic anisotropic in microforming for a plane stress state condition. Yield function and constitutive equations for the anisotropic material with consideration of the crystal lattice constants and parameters of crystallography texture are proposed. The crystal orientation is considered in a subroutine VUMAT algorithm, as an internal variable based on the developed mathematical model which is implemented in Abaqus as an user material subroutine. Micro limiting dome height experimental tests for different strain paths are conducted with brass foils. The results are compared with that predicted with numerical analysis, considering critical damage and element deletions. The numerical and experimental results show a good agreement for the Alpha brass ultra-thin foils, using a set of failure criterion.
APA, Harvard, Vancouver, ISO, and other styles
48

Cao, Zi Zhen, Ji Feng Zhang, Yun Wan, and Yong Gang Xie. "A Damage Model for Prediction of the Open-Hole Strength of Glare Laminates." Applied Mechanics and Materials 325-326 (June 2013): 123–27. http://dx.doi.org/10.4028/www.scientific.net/amm.325-326.123.

Full text
Abstract:
A three-dimensional progressive damage model is proposed to predict the open-hole tensile strength of Glare laminates. For the glass fiber reinforced epoxy the user subroutine UMAT is employed for description of the failure modes, such as matrix cracking and fiber failure. Behavior of the delamination between plies of the laminate is described using cohesive elements. Laminates with a rhombic hole, a square hole and a circular hole are taken into consideration separately. The results obtained by the present solution approach are validated with those available in the literatures.
APA, Harvard, Vancouver, ISO, and other styles
49

Kong, Xiang Hong, and Zhi Jin Wang. "Analysis and Experiment of Compressive Residual Strength of Composite Laminates with Holes." Advanced Materials Research 936 (June 2014): 43–52. http://dx.doi.org/10.4028/www.scientific.net/amr.936.43.

Full text
Abstract:
Experiment and Finite element analysis were used to study the strengths of composite laminates with and without holes. Finite element progressive damage analysis with Tsai-Wu criteria was applied to calculate the compressive residual strength of composite laminate. Abaqus and its user subroutine USDFLD were used for the finite element analysis. Tsai-Wu criteria as the failure criteria was realized in USDFLD as a Fortran program segment, and the stiffness degradation for the damaged elements was also realized by USDFLD. Analytic results gotten by progressive damage method were very close to the experimental results.
APA, Harvard, Vancouver, ISO, and other styles
50

Zheng, Yu Qing, and Jing Yu Cui. "FE Analysis of Hot Strips’ Temperature Distribution in Laminar Cooling Process." Advanced Materials Research 900 (February 2014): 647–50. http://dx.doi.org/10.4028/www.scientific.net/amr.900.647.

Full text
Abstract:
The temperature distribution of the hot-rolled strip in the ROT cooling process was calculated and analyzed using ABAQUS in this paper. The complicated heat transfer coefficients of hot strip considering the position effects of top and bottom nozzles, and the non-uniform heat transfer situation along the width direction were defined by user subroutine. The simulation results were in good correlation with test results. It’s helpful for further analysis to improve the temperature distribution uniformity and the simulation accuracy for FE model, and guide the on-site production.
APA, Harvard, Vancouver, ISO, and other styles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography