Temat: finite element modelling

Skocz do pozycji: 1.

Tytuł:: Parametric syudy of a pneumatic tire under inflation using the FEM approach
Analiza parametrów opony pneumatycznej obciążonej ciśnieniem wewnętrznym, za pomocą MES
Autorzy:: Pelc, J.
Tematy:: tire
composite materials
finite element modelling; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/280092.pdf Link otwiera się w nowym oknie
Opis:: The influence of some parameters of pneumatic tire on its deformation and stresses under inflation pressure has been analyzed. The 2D axisymmetrical finite element model was applied. Large displacements have been taken into account in the strain-displacement relations. Orthotropy ratio variations appearing in a specific tire cord-rubber composite have been also considered. The following input data have been taken: belt ply width, belt cord angle and longitudinal stiffness of carcass fiber. The tire model was verified using the experimental results. Good correlation was observed between the corresponding displacements.
Przeanalizowano wpływ niektórych parametrów konstrukcyjnych opony pneumatycznej na jej deformację i naprężenia wywołane działaniem ciśnienia wewnętrznego. Zastosowano metodę elementów skończonych. Założono obrotową symetrię zadania. w rozważaniach uwzględniono duże przemieszczenia. Wzięto także pod uwagę zmienność współczynnika ortotropii w specyficznym kompozycie oponowym złożonym z kordu i gumy. Zmienne wejściowe stanowiły: szerokość opasania, kąt nachylenia nitki w warstwie opasania i sztywność nitek osnowy. Na podstawie przeprowadzonej weryfikacji modelu obliczeniowego opony można wnioskować, że w zakresie przemieszczeń zadowalająco dokładnie opisuje on obiek rzeczywisty.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: A preliminary study on the optimal choice of an implant and its orientation in ventral hernia repair
Autorzy:: Lubowiecka, I.
Szepietowska, K.
Szymczak, C.
Tomaszewska, A.
Tematy:: biomechanics
surgical mesh
finite element modelling
optimisation; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/281053.pdf Link otwiera się w nowym oknie
Opis:: This paper addresses the problem of ventral hernia repair. The main goals are to find an optimal surgical mesh for hernia repair and to define its optimal orientation in the abdominal wall to minimise the maximum force at the tissue-implant juncture. The optimal mesh is chosen from a set of orthotropic meshes with different stiffness ratios for typical hernia placement in the abdominal area. The implant is subjected to an anisotropic displacement field, different for the selected hernia placements. The assumed displacement fields correspond to regular human activity. Proper implantation of the mesh may determine the success of hernia repair and/or the postoperative comfort of patients. The proposed solution is based on FEM simulations of different surgical meshes behaviour. In typical hernia placements, the optimal orientation of the stiffer direction of the implant is perpendicular to the spine. However, the presented results show some cases that an oblique direction may be the optimum one.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Analysis of thin - walled girders subjected to a pulse torsional torque
Autorzy:: Czechowski, L.
Kubiak, T.
Tematy:: thin-walled structures
dynamic buckling
finite element modelling; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/247957.pdf Link otwiera się w nowym oknie
Opis:: Thin-walled structures, which are primarily meant for static load service conditions may be subjected to transient dynamic loads, which may in turn lead to a more dangerous state of stress in the structure. These transient overloads as compared to steady state (static) loads may deteriorate the mechanical properties of the structural member or lead to its failure. Therefore, analysis of dynamically loaded structures, or the answer to the question at what dynamic loading relative to static loading the structures may be serviceable, is a valid and pertinent issue. This paper deals with thinwalled iso- and/or orthotropic box girders subjected to a pulsed torsional moment causing restrained torsion. Numerical calculations were conducted by means of the ANSYSŽ software, a computer suite applying the finite element method [12]. The results were presented in the form of displacement maps and diagrams determining the maximum angle of rotation or deflection of the girder wall as a function of the dynamic load factor, DLF (the ratio of pulse loading amplitude to static critical load).
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Application of the finite element method in the milling process stability diagnosis
Autorzy:: Dunaj, Paweł
Marchelek, Krzysztof
Chodźko, Marcin
Tematy:: chatter
finite element modelling
modal analysis
machine tool; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/279318.pdf Link otwiera się w nowym oknie
Opis:: The article presents results of both experimental and FEM model-based investigations on chatter phenomena that occur in the end milling process. On the basis of chatter symptoms observed during machining, the mechanism of its occurrence has been identified. Then, a FEM model has been built to indicate machine tool elements responsible for loss of stability. Afterwards, experimental modal analysis has been conducted in order to validate the FEM model. Finally, on the basis of the validated model, the structural changes have been proposed and applied in the real object resulting in increased stability.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Numerical and experimental modelling of slope stability and seepage water of earthfill dam
Autorzy:: El-Hazek, Alaa N.
Abdel-Mageed, Neveen B.
Hadid, Mohammed H.
Tematy:: earthfill dam
finite element modelling
GeoStudio
seepage
slope stability; Pokaż więcej
Wydawca:: Instytut Technologiczno-Przyrodniczy
Powiązania:: https://bibliotekanauki.pl/articles/947129.pdf Link otwiera się w nowym oknie
Opis:: In this paper, finite element modelling is employed for simulating and analysing seepage and slope stability of earthfill dam via GeoStudio software. Two products are employed, which are SLOPE/W for slope stability and SEEP/W for seepage analysis. The behaviour of earthfill dam with four different types of sandy soils having different values of hydraulic conductivity (K) has been studied. Different upstream (US) slopes of 1:2, 1:2.5, 1:3 and 1:3.5 for the earthfill dam are simulated. The downstream (DS) slope is constant at 1:2. The results showed for all the four types of soils that when the US slope is increased, the amount of seepage from the dam increases and the factor of safety (F) decreases. For each US slope, when K (type of soil) increases, both seepage and F increase. Fine sand soil is associated with less seepage and less F. Sixteen equations are obtained to predict both seepage and F with respect to US slope for each type of soil and K of the soil for US slope. An experimental model for earthfill dam is constructed in the laboratory of hydraulics, Benha University to investigate the seepage of water through earthfill dams. It is concluded that seepage decreased when K decreased, and when the US slope for each type of soil decreased. The seepage increased when K increased for each US slope. Seven equations are obtained to predict seepage with respect to US slope for each type of soil, and K for each US slope.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Orthotropic membrane as a mechanical model of surgical implant in abdominal hernia repair
Autorzy:: Lubowiecka, I.
Tematy:: biomechanics
membrane
incisional hernia
finite element modelling
orthotropic implants; Pokaż więcej
Wydawca:: Politechnika Gdańska
Powiązania:: https://bibliotekanauki.pl/articles/1933989.pdf Link otwiera się w nowym oknie
Opis:: Even though the incisional hernia repair surgery is a well known procedure, mechanical properties of the tissue-implant system are unknown, so the implantation of the repairing mesh is quite intuitive, and recurrences of the condition continue to occur. The main objective of the study is to define a model of repaired hernia that can be used for surgery planning and assessment of the repair durability. The load applied to the structure corresponds to this widely accepted model as the one that can cause hernia recurrence. In the proposed solution, the reaction forces calculated when the extreme abdominal pressure acts on the model are considered as the crucial factors in the repair planning and the connection strength evaluation. These reactions representing the tissue-implant junction forces cannot exceed the limit value experimentally obtained for the synthetic mesh and porcine tissue connection described in literature. The achieved finite element simulations results are compared with the experiments and the proposed solution shows good accuracy.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Oil pipeline leak detection using GPR method - simple case study
Autorzy:: Fąfara, Z.
Lewandowska-Śmierzchalska, J.
Matuła, R.
Tematy:: pipelines
leak detection
GRP method
computer simulation
finite element modelling; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:: https://bibliotekanauki.pl/articles/299301.pdf Link otwiera się w nowym oknie
Opis:: Modelling experiment was used to investigate the abilities of using ground penetrating radar (GPR) to detect oil leaks in the underground pipeline system. Leaks not only waste precious natural resources but also create substantial damage to the transportation system within urban environments. Surface geophysical methods are noninvasive tools used to characterize the changes in the physical properties of the subsurface material. This characterization, in consequence, is used to interpret the geological and hydrogeological conditions of the strata. GPR is a reflection-based technique which uses high frequency electromagnetic waves to acquire subsurface information. GPR responds to changes in electrical properties, which are a function of soil and rock material and moisture content. A simple experiment was conducted to determine the validity and effectiveness of GPR technology in detecting leakage in metal pipelines. Initially, a prototype model was designed to simulate a pipe leak. A 1.5 GHz antenna modeling mode was used to collect GPR data. The test was modelled using sandy soil material that is representative for pipelines construction. Also model simulations are being used to select an appropriate equipment configuration (frequency band, type of antenna and real-time imaging software) prior to data acquisition.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: CHBDC buried structures: challenges in keeping pace with practice and innovation
Autorzy:: Newhook, J. P.
Tematy:: codes
finite element modelling
buried structures
foundations
buckling
construction
cold regions; Pokaż więcej
Wydawca:: Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Powiązania:: https://bibliotekanauki.pl/articles/384004.pdf Link otwiera się w nowym oknie
Opis:: Soil-steel structures have been part of Canadian design codes since the 1970s. The inclusion in the Ontario design codes was necessary due to a growing use of flexible buried structures in practice. Since those early developments, the subsequent code committees have always strived to find the appropriate balance between the primary objective of providing design criteria that reflect the safety and serviceability requirements of the code and incorporating the significant practical experience of owners, engineers and industry. Each decade has seen innovations in products and applications as well as advances in research and numerical modelling. Editions of the code have acknowledged these changes, often in the non-mandatory sections, but have sometimes struggled to provide specific criteria. Instead it has provided general guidance or framework for design. Currently, many of the existing design clauses do not directly cover the applications of both flexible and rigid buried structures in regular use today. This paper describes the key updates being proposed for the Buried Structures section of the Canadian Highway Bridge Design Code. These changes are based on input from owners, engineers and industry describing the needs for current design and practice as well as a modem framework for permitting innovation. The major changes include areas such of finite element analysis, foundation design, conduit wall buckling and the use of flexible structures in cold regions susceptible to permafrost. These major changes will be discussed conceptually as final approval is still pending before inclusion in the 2019 version. The paper will describe some of the background and rationale for the proposals. Finally, the paper will discuss the challenges faced by the sub-committee in determining what should be included in the mandatory sections of the code or in commentary.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Surface based cohesive behavior implementation for the strength analysis of glued-in threaded rods in Glulam
Autorzy:: Gečys, T.
Šaučiuvėnas, G.
Ustinovichius, L.
Miedzialowski, C.
Sulik, P.
Tematy:: glued-in rods
epoxy glue
finite element modelling
threaded steel rod; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/200957.pdf Link otwiera się w nowym oknie
Opis:: The paper presents the analysis of strength and stiffness of metric threaded steel rods glued in glulam obtained by using two different gluing methods. The first method is used when the threaded steel rod is glued into a groove larger than the rod’s diameter, while the second method is applied when the diameter of the groove is smaller than the diameter of the threaded steel rod. The steel rod is covered with glue before it is inserted into the smaller diameter groove. The first method investigates the 2-mm-thick glue-line, while the second method analyses the contact when the groove’s diameter is 2 mm smaller than the outer diameter of the rod. Epoxy-type resin is used for both gluing methods. Different gluing methods present different interactions between the steel rod and glulam which result in different failure modes. The second method presents a plastic failure between the steel rod and glulam caused by the local compression and shear of glulam. The presented studies are made using metric threaded steel rods of diameters M12 and M16. In total, 20 specimens are experimentally tested in tension-to-tension tests performed according to EN 26891. The interaction between glulam and glued steel rods is also investigated using the 3D finite element modelling. The results obtained using the proposed 3D finite element model with different contact conditions between steel and glulam and the failure criterion for timber shear are well in line with the experimental findings.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Resonance of a structure with soil elastic waves released in non-linear hysteretic soil upon unloading
Autorzy:: Kowalczyk, Piotr
Tematy:: finite element modelling
earthquake engineering
wave propagation
soil dynamics
soil non-linearity; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/2172887.pdf Link otwiera się w nowym oknie
Opis:: High-frequency motion is often observed in small-scale experimental works carried out in flexible containers under simplified seismic loading conditions when single harmonic sine input motions are introduced at the base of a soil specimen. The source of the high-frequency motion has often been sought in experimental inaccuracies. On the other hand, the most recent numerical studies suggested that high-frequency motion in the steady-state dynamic response of soil subjected to harmonic excitation can also be generated as a result of soil elastic waves released in non-linear hysteretic soil upon unloading. This work presents an example of a finite element numerical study on seismic soil–structure interaction representative of an experimental setup from the past. The results show how high-frequency motion generated in soil in the steady-state response, apparently representative of soil elastic waves, affects the steady-state response of a structure, that is, it is presented how the structure in the analysed case resonates with the soil elastic waves. The numerical findings are verified against the benchmark experimental example to indicate similar patterns in the dynamic response of the structure.
Dostawca treści:: Biblioteka Nauki

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