Temat: constitutive model - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Modelling of material behaviour for Inconel 718 superalloy using experimental data
Autorzy:: Nieslony, P.
Grzesik, W.
Laskowski, P.
Tematy:: modeling
machining
constitutive model; Pokaż więcej
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Powiązania:: https://bibliotekanauki.pl/articles/99822.pdf Link otwiera się w nowym oknie
Opis:: In this paper parameters of the Johnson-Cook (J-C) constitutive material model were predicted more accurately based on the static and dynamic material tests and mathematical modelling of relevant response surfaces using specially developed Matlab scripts. Experimental tests were performed under strain rates of 10^-3 and 10¹ 1/s and the temperature ranging from the ambient up to 700°C. As a result, a set of mathematical models which fit the experimental data was determined. The experimentally-derived constitutive models were implemented into FEM-based simulations of real machining processes of Inconel 718.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The elasto- viscoplastic Chaboche model
Autorzy:: Ambroziak, A.
Kłosowski, P.
Tematy:: elasto-viscoplastic
Chaboche model
constitutive model; Pokaż więcej
Wydawca:: Politechnika Gdańska
Powiązania:: https://bibliotekanauki.pl/articles/1955352.pdf Link otwiera się w nowym oknie
Opis:: The elasto-viseoplastie constitutive equations of the Chaboehe model [I] have been developed and modified many times. The aim of the present paper is to present the existing Chaboche model variants and describe its scientific and engineering applications. A compact review of literature on these applications is given, focussed on publications offering a wider and more comprehensive view of the elasto-viscoplastic Chaboche model. The article is an introduction to a comprehensive investigation of the elasto-viscoplastic Chaboche model.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Rock strength anisotropy in high stress conditions: a case study for application to shaft stability assessments
Autorzy:: Watson, J. M.
Vakili, M.
Jakubowski, M.
Tematy:: anisotropy
high stress
numerical modeling
constitutive model; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/178168.pdf Link otwiera się w nowym oknie
Opis:: Although rock strength anisotropy is a well-known phenomenon in rock mechanics, its impact on geotechnical design is often ignored or underestimated. This paper explores the concept of anisotropy in a high stress environment using an improved unified constitutive model (IUCM), which can account for more complex failure mechanisms. The IUCM is used to better understand the typical responses of anisotropic rocks to underground mining. This study applies the IUCM to a proposed rock shaft located in high stress/anisotropic conditions. Results suggest that the effect of rock strength anisotropy must be taken into consideration when assessing the rock mass response to mining in high stress and anisotropic rock conditions.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Numerical modelling of elasto-viscoplastic Bodner-Partom constitutive equations
Autorzy:: Ambroziak, A.
Tematy:: elasto-viscoplastic constitutive model
Bodner-Partom
FEM; Pokaż więcej
Wydawca:: Politechnika Gdańska
Powiązania:: https://bibliotekanauki.pl/articles/1964145.pdf Link otwiera się w nowym oknie
Opis:: The aim of the paper is to propose an FE procedure for static and dynamic nonlinear analysis including elasto-viscoplastic constitutive equations of the Bodner-Partom model. Basic equations of the constitutive model are given with the flow graph used in the FE procedure. The proposed procedure has been applied in the MSC.Marc commercial system with a user-defined UVSCPL subroutine that enables application to a wide range of varied finite elements. A number of simple problems of static and dynamic analysis are presented to show the accuracy of this approach. The numerical simulations are compared with experiments to validate the proposed FE procedure.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Constitutive model for time-dependent ratchetting of SS304 stainless steel: simulation and its finite element analysis
Konstytutywny model zależnego od czasu zjawiska ratchetingu dla stali SS304 – symulacja i analiza metodą elementów skończonych
Autorzy:: Jiang, X.
Zhu, Y.
Hong, J.
Zhang, Y.
Kan, Q.
Tematy:: ratchetting
time-dependence
constitutive model
finite element method; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/280590.pdf Link otwiera się w nowym oknie
Opis:: Time-dependent ratchetting behaviour of SS304 stainless steel was experimentally conducted at room temperature and 973K. The material shows distinct time-dependent deformation. However, under cyclic stressing with a certain peak/valley stress hold and at 973K, more significant time-dependent inelastic behaviour was observed. Based on the Abdel-Karim-Ohno nonlinear kinematic hardening rule with the static recovery term, a time-dependent hardening rule incorporating an internal variable in the dynamic recovery term of the back stress is proposed to reasonably describe the evolution behaviour of time-dependent ratchetting with a certain peak/valley stress hold and at high temperature. Simultaneously, the proposed model is implemented into the ANSYS finite element package by User Programmable Features (UPFs). It is shown that the customized ANSYS model exhibits better performance than the reference model, especially under cyclic stressing with the certain peak/Valley stress hold and at high temperature.
W pracy przedstawiono wyniki badań eksperymentalnych nad zależnym od czasu procesem zmęczeniowym typu ratcheting przeprowadzonych w temperaturze pokojowej oraz podwyższonej do 973K. Materiał wykazał wyraźnie zależną od czasu funkcję deformacji. Podczas cyklicznego obciążania przy zadanych wartościach min/max naprężeń w temperaturze 973K zaobserwowano silnie nieliniowe i zależne od czasu zachowanie się badanej stali. Do wyjaśnienia tego zjawiska, zwanego ratchetingiem zależnym od czasu, wykorzystano model umocnienia materiału oparty na nieliniowej formule kinematycznego umocnienia Abdela-Karima-Ohno ze statycznym członem odprężania. Model ten zmodyfikowano, wprowadzając wewnętrzną zmienną w dynamicznym członie odprężania przy obciążeniu powrotnym. Jednocześnie zaproponowany model wdrożono do systemu ANSYS poprzez zastosowanie pakietu User Programmable Features (UPFs). Wykazano, że taka modyfikacja systemu ANSYS charakteryzuje się lepszym działaniem w stosunku do standardowego oprogramowania. Jest to szczególnie zauważalne dla symulacji cyklicznego obciążenia stali w podwyższonej temperaturze.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Building a numerical model for bulk materials from standard shear test data
Autorzy:: Feise, H.
Daiss, A.
Tematy:: constitutive model
FEM
silo flow material parameters stress; Pokaż więcej
Wydawca:: Politechnika Gdańska
Powiązania:: https://bibliotekanauki.pl/articles/1955777.pdf Link otwiera się w nowym oknie
Opis:: While numerical methods have become an integral part of everyday work in process engineering for fluid processes, there is a curious lack of such methods in the field of solid handling. One of the reasons may be the inability of the most often used CFD codes to handle bulk solids. In the paper an attempt is made to show how the behaviour of bulk solids can be modelled using a CFD code without a specific constitutive model for bulk solids. Another reason for not using numerical tools to handle bulk materials is the difficulty of generating the necessary material parameters. Those material models suitable for bulk solids that are available in commercial packages are mostly derived from soil mechanics. Their parameters are determined using a triaxial cell. This device is generally not available in the chemical industries and most often not suitable for bulk solids, due to the high stress levels applied in those tests. In the paper a method is presented which allows the use of standard shear test data, supplemented by data from a compression tests in a "lambda-meter", to determine the parameters of an extended Drucker-Prager model with a compressive yield cap. Model equations are given and parameters are determined for white polymer powder. With these parameters a simulation of silo discharge has been performed successfully using a CFD code. To make CFD codes, which already have the much-needed multi-phase capability, capable of handling bulk solid flow, significant work remains to be done (e.g. shear stresses at rest and anisotropic stress tensors).
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Determination of Uniaxial Tensile Behavior of Hypodermis in Porcine Skin Based on Rule of Mixtures
Autorzy:: Choi, Junsuk
Kim, Sanghoon
Rhim, Sungsoo
Rhee, Kyong-Yop
Tematy:: porcine skin
skin layers
visco-hyperelastic
constitutive model; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/353406.pdf Link otwiera się w nowym oknie
Opis:: In this study, we investigate the mechanical behavior of each skin layer, in terms of the nominal stress-strain curve by uniaxial tensile tests using specimens of porcine skin in two forms: dermis containing epidermis, and all three layers. All tests were performed under cyclic loading at the constant strain rate of 10^-3 s^-1 at ambient temperature. To measure the precise initial crosssectional areas of each layer, the thickness of each skin layer was quantified by counting the number of pixels on the photo-image using image-processing software. In the tensile test, force-strain curves of the total skin and dermis with epidermis were obtained. Subsequently, a rule of mixtures was applied to determine the nonlinear mechanical properties of the hypodermis layer. In conclusion, we could define the uniaxial tensile behavior of the hypodermis, and additionally predict the weight effect of the dermis and hypodermis layers in the tensile test.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Calibration of Visco-Hyperelastic Model for Tensile Behavior of Porcine Skin
Autorzy:: Shin, Heonseop
Han, Doyeon
Kim, Sanghoon
Rhim, Sungsoo
Tematy:: porcine skin
skin layers
visco-hyperelastic
constitutive model; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/354427.pdf Link otwiera się w nowym oknie
Opis:: Uniaxial tensile tests were performed on porcine skin to investigate the tensile stress-strain constitutive characteristic at qua-sistatic deformations using uniaxial tensile tests. Experimental results were then used to determine the parameters of the various constitutive model types for rubber, including the Mooney-Rivlin, Yeoh, Ogden, and others. The Prony series viscoelastic model was also calibrated based on the stress relaxation test. To investigate the calibrated constitutive equations (visco-hyperelastic), the falling impact test was conducted. From the viewpoint of the maximum impact load, the error was approximately 15.87%. Overall, the Ogden model predicted the experimental measurements most reasonably. The calibrated constitutive model is expected to be of practical use in describing the mechanical properties of porcine skin.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Simulation of Steel Armour Penetration Using the Johnson-Cook Model
Autorzy:: Wiśniewski, A.
Tomaszewski, Ł.
Tematy:: numerical simulations
AUTODYN
SPH method
Johnson-Cook constitutive model; Pokaż więcej
Wydawca:: Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Powiązania:: https://bibliotekanauki.pl/articles/403450.pdf Link otwiera się w nowym oknie
Opis:: The numerical simulations were carried out of penetration of 12.7 mm armour piercing projectile into the ARMOX 500 steel armour with the use of the AUTODYN 2D software program applying axis symmetry. The calculations were performed by means of the SPH (Smooth Particle Hydrodynamic) method. A constitutive Johnson-Cook model was used for both the armour and the projectile. The influence of discretization density of the numerical model on the residual velocity vr of the projectile, its wear and time of calculations was studied. An eight times decrease in the distance between the SPH particles in the numerical model causes an over 130 fold increase of the projectile residual velocity and a 960 fold increase in the calculation time. The examined aspects included the influence of armour thickness g and yield stress Re of the projectile material on its residual velocity and manner of the projectile and armour damage. The residual velocity of the projectile decreases together with an increase of the armour thickness and for g = 20 mm is vr = 300 m/s. Together with a decrease of the yield stress of the projectile material its residual velocity also decreases, the wear of the projectile increases, the shape and the dimensions of cross section hole in the armour also change.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Study of contact algorithms influencing specimen response in numerical simulation of dynamic compression test
Autorzy:: Baranowski, Paweł
Damaziak, Krzysztof
Tematy:: JH-2 constitutive model
sandstone
rock
SHPB
LS-DYNA; Pokaż więcej
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Powiązania:: https://bibliotekanauki.pl/articles/58907263.pdf Link otwiera się w nowym oknie
Opis:: This paper demonstrates the importance of a proper contact algorithm selection when a constitutive model is correlated and validated, especially in the case of brittle materials. A parametric study is carried out to study the influence of contact parameters on the outcomes of the numerical simulations of a dynamic compression test. The split Hopkinson pressure bar (SHPB) model is developed, and sandstone rock is considered as a representative material having considerably different properties compared to SHPB bars. The finite element method (FEM) and smoothed particle hydrodynamics (SPH) were used to simulate specimen behaviour using a LS-Dyna solver. Two contact types based on the penalty method are analysed: nodes to surface (FEM and SPH) and surface to surface (FEM only). Furthermore, three approaches of contact stiffness calculation are used for each contact type. The waveform data and failure patterns are then compared among all simulated cases and the corresponding experimental outcomes. It is found that the soft constraint stiffness (SOFT = 1) provides the best outcomes, especially in the case of one-way contact, and is nearly insensitive to stiffness scaling parameters. By contrast, standard (SOFT = 0) and segment-based (SOFT =2) approaches require a substantial effort in adjusting the stiffness scaling parameters to obtain satisfactory results. This paper provides valuable guidance for correlating and validating parameters of constitutive models for rock and other brittle materials in the SHPB test.
Dostawca treści:: Biblioteka Nauki

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