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Relevant bibliographies by topics / User-subroutine

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Academic literature on the topic 'User-subroutine'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "User-subroutine"

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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.

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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.

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

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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 .

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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.

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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.

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Dissertations / Theses on the topic "User-subroutine"

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Maag, Chase R. "A User Subroutine to be used with ABAQUS to solve Biphasic contact problems." University of Toledo / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1431648889.

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Ravi, Lokranjith K. "Cycle-up of multiple rifting event models how long does it take to reach a steady state stress /." Lexington, Ky. : [University of Kentucky Libraries], 2005. http://lib.uky.edu/ETD/ukymeen2005t00234/newranjiththesis.pdf.

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Thesis (M.S.) --University of Kentucky, 2005.
Title from document title page (viewed on August 17, 2005). Document formatted into pages; contains: x, 107 p. : col. ill. Includes abstract and vita. Includes bibliographical references (p. 104-106).

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Li, Qian. "Finite Deformations of Fiber-Reinforced Rubberlike Solids, and of Adhesively Bonded T-peel Joints." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/82923.

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Fiber-reinforced rubberlike materials (FRRM) commonly used in tires undergo large deformations, and exhibit different response in tension and compression along the fiber direction. Assuming that the response of a fiber-reinforced rubberlike material can be modeled as transversely isotropic with the fiber direction as the axis of transverse isotropy, we express the stored energy function, W, in terms of the five invariants of the right Cauchy-Green strain tensor and the fiber direction, and account for different response in tension and compression along the fiber direction. It has been shown in the literature that in shear-dominated deformations, the 5th invariant, I5, significantly contribution to the stress-strain curve. We have implemented the constitutive relation in the commercial software, LS-DYNA. The numerical solutions of several boundary value problems studied here agree with their analytical solutions derived by using Ericksen's inverse approach, in which a part of the solution is assumed and unknowns in the presumed solution are then found by analyzing the pertinent boundary value problem. However, computed results have not been compared with experimental findings. For W of the FRRMs an expression that is a complete quadratic function of the five invariants is also examined. Homogeneous deformations such as simple extension, simple shear, and biaxial loading problems are studied to delineate the mechanical behaviors of FRRMs. Consistency with the infinitesimal deformation theory requires that linear terms in the 4th and 5th invariants, I4 and I5, be included in the expression for W. Stability analysis of deformations reveals the qualitative changes triggered by the second order terms of the quadratic function. Analytical solutions for inflation, extension and twist deformations caused by internal pressure, end torque, and axial force for a pressurized cylindrical laminate are derived using Ericksen's inverse method. Effects of fiber orientations on the mechanical behaviors of a +/-α angle-ply cylindrical tube are investigated using the derived analytical solutions. The T-peel test, widely used for characterizing adhesion across a plethora of adhesives, adherends, and geometries, results in a range of responses that may complicate meaningful interpretation of the test data. This research effort, involving several specific specimen types, was undertaken to investigate concerns that commonly used configurations may not always result in plateaus in the force-displacement response. We experimentally and numerically study debonding of T-peel specimens having 75 mm bond length and 0.81 mm thick adherends made of either 6061 aluminum (Al) or one of the three steels (G70 70U hot dip galvanized, E60 elctrogalvanized (EGZ), 1010 cold-rolled steel (CRS) bonded with either LORD® 406 or Maxlok™ acrylic adhesive. For the EGZ and the Al adherends, specimens with a bond length of 250 mm and adherend thickness of 1.60 mm are also examined. Effects of adherend materials and thicknesses, bond lengths, and adhesives on test results are examined using three metrics to interpret the T-peel bond performance. We find a limited correlation between the commonly used "T-peel strength" and the energy dissipated per unit debond area. For those two metrics, the relative performances of the CRS and the Al specimens are quite different. Quasi-static plane strain deformations of the test specimens are analyzed by the finite element method (FEM) and a cohesive zone model using the commercial software, ABAQUS, to help interpret the test data. Numerical results provided energies required to elastically and plastically deform the adherends, and help determine the transition from non-self-similar to self-similar debonding. The FE simulations also facilitate determination of the fraction of the crosshead displacement at which self-similar debonding occurs. Results reported herein should help practitioners select appropriate specimen dimensions for extracting meaningful data for adhesive performance.
Ph. D.

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Darkwah, Kwabena. "APPLICATION OF PROCESS SYSTEMS ENGINEERING TOOLS AND METHODS TO FERMENTATION-BASED BIOREFINERIES." UKnowledge, 2018. https://uknowledge.uky.edu/cme_etds/83.

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Biofuels produced from lignocellulosic biomass via the fermentation platform are sustainable energy alternatives to fossil fuels. Process Systems Engineering (PSE) uses computer-based tools and methods to design, simulate and optimize processes. Application of PSE tools to the design of economic biorefinery processes requires the development of simulation approaches that can be integrated with existing, mature PSE tools used to optimize traditional refineries, such as Aspen Plus. Current unit operation models lack the ability to describe unsteady state fermentation processes, link unsteady state fermentation with in situ separations, and optimize these processes for competing factors (e.g., yield and productivity). This work applies a novel architecture of commercial PSE tools, Aspen Plus and MATLAB, to develop techniques to simulate time-dependent fermentation without and with in situ separations for process design, analyses and optimization of the operating conditions. Traditional batch fermentation simulations with in situ separations decouple these interdependent steps in a separate “steady state” reactor followed by an equilibrium separation of the final fermentation broth. A typical mechanistic system of ordinary differential equations (ODEs) describing a batch fermentation does not fit the standard built-in power law reaction kinetics model in Aspen Plus. To circumvent this challenge, a novel platform that links the batch reactor to a FORTRAN user kinetics subroutine (incorporates the ODEs) combined with component substitution (to simulate non-databank components) is utilized to simulate an unsteady state batch and in situ gas stripping process. The resulting model system predicts the product profile to be sensitive to the gas flow rate unlike previous “steady state” simulations. This demonstrates the importance of linking a time-dependent fermentation model to the fermentation environment for the design and analyses of fermentation processes. A novel platform linking the genetic algorithm multi-objective and single-objective optimizations in MATLAB to the unsteady state batch fermentation simulation in Aspen Plus through a component object module communication platform is utilized to optimize the operating conditions of a typical batch fermentation process. Two major contributions are: prior concentration of sugars from a typical lignocellulosic hydrolysate may be needed and with a higher initial sugar concentration, the fermentation process must be integrated with an in situ separation process to optimize the performance of fermentation processes. With this framework, fermentation experimentalists can use the full suite of PSE tools and methods to integrate biorefineries and refineries and as a decision-support tool to guide the design, analyses and optimization of fermentation-based biorefineries.

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Chlebek, David. "Simulation of ultrasonic time of flight in bolted joints." Thesis, KTH, Hållfasthetslära, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-298342.

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Ultrasonic measurements of the preload in bolted joints is a very accurate method since it does not depend on the friction and other factors which cause difficulties for common methods. The ultrasonic method works by emitting an ultrasonic pulse into the bolt which is reflected at the end and returned to the transducer, the change in the time of flight (TOF) can be related to the elongation of the bolt and therefore the preload. One must account for the acoustoelastic effect which is the change in sound speed due to an initial stress state. The goal of this thesis project was to implement a Murnaghan hyperelastic material model in order to account for the acoustoelastic effect when conducting a numerical simulation using the finite element method (FEM). An experiment was also performed to validate the numerical simulation. The DeltaTOF as a function of a tensile force was obtained for an M8 and M10 test piece from the experiment. The material model was implemented by creating a user subroutine written in Fortran for the explicit solver Radioss. Hypermesh was used to set-up the numerical simulation. The material model has shown an expected behavior with an increased sound speed with compressive stresses and a decreased speed with tensile stresses. The numerical simulation showed a good correspondence to the experimental results.
Ultraljudsmätning av klämklraften i skruvförband är en väldigt noggrann metod eftersom att metoden inte påverkas av friktion eller andra faktorer som innebär svårigheter för vanliga metoder. Ultraljudsmetoden fungerar genom att skicka in en ultraljudsvåg i skruven som reflekteras i botten och återvänder tillbaka till sensorn. Skillnaden i tiden för ekot att återvända kan relateras till förlängningen av skruven och därmed klämkraften. Det är viktigt att ta hänsyn till den akustoelastiska effekten, som är fenomenet där ljudhastigheten av en våg i en solid förändras med spänningstillståndet. Målet med det här arbetet är att implementera en hyperelastisk Murnaghan modell som tar hänsyn till den akustoelastiska effekten med FEM simuleringar. Ett experiment har också genomförts för att validera beräkningsmodellen. Tidsfördröjningen som en funktion av förspänningskraften togs fram för ett M8 och M10 provobjekt. Murnaghans hyperelastiska materialmodell implementerades genom att skapa ett användar material skriven i programmeringsspråket Fortran för den explicita lösaren Radioss. Hypermesh användes för att ställa upp FEM simuleringen. Materialmodellen har visat ett väntat beteende med en ökad ljudhastighet med tryckspänningar och minskad ljudhastighet med dragspänningar. Beräkningsmodellen visade en god överenstämmelse med resultatet från experimentet.

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Dhamade, Harshal Ghanshyam. "Unified Tertiary and Secondary Creep Modeling of Additively Manufactured Nickel-Based Superalloys." Thesis, 2021. http://dx.doi.org/10.7912/C2/40.

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Indiana University-Purdue University Indianapolis (IUPUI)
Additively manufactured (AM) metals have been increasingly fabricated for structural applications. However, a major hurdle preventing their extensive application is lack of understanding of their mechanical properties. To address this issue, the objective of this research is to develop a computational model to simulate the creep behavior of nickel alloy 718 manufactured using the laser powder bed fusion (L-PBF) additive manufacturing process. A finite element (FE) model with a subroutine is created for simulating the creep mechanism for 3D printed nickel alloy 718 components. A continuum damage mechanics (CDM) approach is employed by implementing a user defined subroutine formulated to accurately capture the creep mechanisms. Using a calibration code, the material constants are determined. The secondary creep and damage constants are derived using the parameter fitting on the experimental data found in literature. The developed FE model is capable to predict the creep deformation, damage evolution, and creep-rupture life. Creep damage and rupture is simulated as defined by the CDM theory. The predicted results from the CDM model compare well with experimental data, which are collected from literature for L-PBF manufactured nickel alloy 718 of creep deformation and creep rupture, at different levels of temperature and stress. Using the multi-regime Liu-Murakami (L-M) and Kachanov-Rabotnov (K-R) isotropic creep damage formulation, creep deformation and rupture tests of both the secondary and tertiary creep behaviors are modeled. A single element FE model is used to validate the model constants. The model shows good agreement with the traditionally wrought manufactured 316 stainless steel and nickel alloy 718 experimental data collected from the literature. Moreover, a full-scale axisymmetric FE model is used to simulate the creep test and the capacity of the model to predict necking, creep damage, and creep-rupture life for L-PBF manufactured nickel alloy 718. The model predictions are then compared to the experimental creep data, with satisfactory agreement. In summary, the model developed in this work can reliably predict the creep behavior for 3D printed metals under uniaxial tensile and high temperature conditions.

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Book chapters on the topic "User-subroutine"

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Feenstra, Peter H. "Implementing an isotropic damage model in Diana: Use-case for the user-supplied subroutine usrmat." In Finite Elements in Civil Engineering Applications, 89–97. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003211365-12.

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"User subroutine for FRP under cyclic load." In Nonlinear Finite Element Analysis of Composite and Reinforced Concrete Beams, 243–44. Elsevier, 2020. http://dx.doi.org/10.1016/b978-0-12-816899-8.09986-7.

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"User subroutine for steel under cyclic load." In Nonlinear Finite Element Analysis of Composite and Reinforced Concrete Beams, 233–41. Elsevier, 2020. http://dx.doi.org/10.1016/b978-0-12-816899-8.09987-9.

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"User subroutine for concrete under cyclic load." In Nonlinear Finite Element Analysis of Composite and Reinforced Concrete Beams, 227–32. Elsevier, 2020. http://dx.doi.org/10.1016/b978-0-12-816899-8.09988-0.

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Han, D., J. Choung, K. J. Paik, and H. S. Kim. "Very efficient ship-to-ice interaction simulations using user-subroutine of a commercial finite element code." In Developments in the Collision and Grounding of Ships and Offshore Structures, 199–203. CRC Press, 2019. http://dx.doi.org/10.1201/9781003002420-25.

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Conference papers on the topic "User-subroutine"

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Chow, C. L., X. J. Yang, and E. Chu. "LS-DYNA3D Simulation of Sheet Metal Forming using Damage Based User Subroutine." In SAE 2001 World Congress. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2001. http://dx.doi.org/10.4271/2001-01-1129.

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Abdelmoula, Hichem, Mostafa Hassanalian, and Abdessattar Abdelkefi. "User subroutine for fatigue modeling of wing structure of flapping micro air vehicle." In AIAA Modeling and Simulation Technologies Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2017. http://dx.doi.org/10.2514/6.2017-0574.

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Choung, Joonmo, Sung-Won Yoon, Sung-Ju Park, and Woongshik Nam. "Failure Prediction of Low-Temperature High-Strength Steel on Average Stress Triaxiality Using Abaqus User-Subroutine." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-23790.

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This study deals with failure strain prediction according to stress triaxiality of a typical polar class steel EH36. Choung et al. [1, 2] have formulated failure strain curve of EH36 steel by carrying out a number of tensile tests for round and flat specimens with various notches. Extra tests for notched flat specimens which machined in transverse direction are conducted to formulate the failure strain curve. In order to verify the validity of failure strain curve, we develop user-subroutine (VUSDFLD) of a commercial finite element code, Abaqus/Explicit. Fracture simulation with user-subroutine shows that two results are closely coincident by comparison of force-elongation curves.

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Wang, Jirui, Shuguang Zuo, Lei Lei, Xianwu Yang, and Xudong Wu. "Simulation and Analysis of Tire Lateral Self-excited Vibration Based on MSC.Marc User Subroutine." In 2010 WASE International Conference on Information Engineering (ICIE 2010). IEEE, 2010. http://dx.doi.org/10.1109/icie.2010.154.

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Xia, Debin, Shuxiang Guo, Liwei Shi, Huiming Xing, Xihuan Hou, Yu Liu, Huikang Liu, Yao Hu, and Zan Li. "Application of ADAMS User-Written Subroutine to Simulation of Multi-gait for Spherical Robot." In 2019 IEEE International Conference on Mechatronics and Automation (ICMA). IEEE, 2019. http://dx.doi.org/10.1109/icma.2019.8816405.

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Abdelmoula, Hichem, Mohamed Shaat, and Abdessattar Abdelkefi. "Finite element modeling of nanoindentation for FG nanomaterials accounting for surface effects using user subroutine." In 58th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2017. http://dx.doi.org/10.2514/6.2017-0797.

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Liu, Jeff, and Abdel-Nasser A. Mohamed. "Efficient Coupling of Absolute Nodal Coordinate Formulation Flexible Bodies With an Existing Multibody Dynamics Code." In ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-71101.

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A couple of issues are identified in the process to embed absolute nodal coordinate formulation (ANCF) flexible bodies in an existing multibody dynamics code. (1) The generalized coordinates of ANCF must be solved together with those of the rest of the mechanism in a combined system of the equations of motion. (2) The various constraints, joints, and forces elements supported in the multibody dynamics code must be extended to the ANCF flexible bodies without major code restructuring. This paper describes two novel techniques that were devised to solve these issues. The first is the idea of interface triad. We will demonstrate how to construct the interface triad such that all exiting constraints, joints, and forces elements are automatically supported. The second idea is to represent the equations of motion of the ANCF body as a user-defined subroutine element representing a set of implicit general state equations subroutine (GSESUB). By treating each ANCF body modularly as a user-defined subroutine, not only all existing integration options of its host solver, e.g., HHT or DAE index-1, 2, and 3, etc., are automatically supported, but also the existing features such as parallel computing and sparse matrix solution of the existing multibody dynamics software are supported with minimum programming. Numerical examples are presented to demonstrate the efficiency and the success of these two techniques.

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Chester, Shawn A. "Numerical Simulation of Polymeric Gels." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-51189.

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Following [1], a theory for coupled fluid diffusion and large deformation is implemented as a user-element subroutine in the commercial finite element package ABAQUS. The governing equations are summarized along with details of the constitutive theory. A few numerical examples are provided to show the robustness of this methodology in both transient and steady state conditions.

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Lee, Chi-Seung, Myung-Sung Kim, Kwang-Ho Choi, Myung-Hyun Kim, and Jae-Myung Lee. "Numerical Prediction Method for Elasto-Viscoplastic Behavior of Glass Fiber Reinforced Polyurethane Foam Under Various Compressive Loads and Cryogenic Temperatures." In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-42360.

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In the present study, the material characteristics of a glass fiber-reinforced polyurethane foam (RPUF) which is widely adopted to a liquefied natural gas (LNG) insulation system was investigated by a series of compressive tests under room and cryogenic temperatures. In addition, a temperature- and strain rate-dependent constitutive model was proposed to describe the material nonlinear behavior such as increase of yield stress and plateau according to temperature and strain rate variations. The elasto-viscoplastic model was transformed to an implicit form, and was implemented into the ABAQUS user-defined subroutine, namely, UMAT. Through a number of simulation using the developed subroutine, the various stress-strain relationships of RPUF were numerically predicted, and the material parameters associated with the constitutive model were identified. In order to validate the proposed method, the computational results were compared to a series of test of RPUF.

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Zhao, Aihong, Ian Owens Pericevic, Kennerly Digges, Cing-Dao Kan, Moji Moatamedi, and Jeffrey S. Augenstein. "FE Modeling of the Orthotropic and Three-Layered Human Thoracic Aorta." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93573.

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The human aorta consists of three layers: intima, media and adventitia from the inner to outer layer. Since aortic rupture of victims in vehicle crashes frequently occurs in the intima and the media, latent aortic injuries are difficult to detect at the crash scene or in the emergency room. It is necessary to develop a multi-layer aorta finite element (FE) model to identify and describe the potential mechanisms of injury in various impact modes. In this paper, a novel three-layer FE aortic model was created to study aortic ruptures under impact loading. The orthotropic material model [1] has been implemented into a user-defined material subroutine in the commercial dynamic finite element software LS-DYNA version 970 [2], which was adopted in the aorta FE model. The Arbitrary-Lagrangian Eulerian (ALE) approach was adopted to simulate the interaction between the fluid (blood) and the structure (aorta). Single element verifications for the user-defined subroutine were performed. The mechanical behaviors of aortic tissues under impact loading were simulated by the aorta FE model. The models successfully predicted the rupture of the layers separately. The results provide a basis for a more in-depth investigation of blunt traumatic aortic rupture (BTAR) in vehicle crashes.

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Reports on the topic "User-subroutine"

1

Saether, Erik, and Alexander Tessler. User-Defined Subroutine for Implementation of Higher-Order Shell Element in ABAQU. Fort Belvoir, VA: Defense Technical Information Center, August 1993. http://dx.doi.org/10.21236/ada269001.

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