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Artykuły w czasopismach na temat "ABAQUS 60.10"
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Sun, Jian Liang, Zheng Yi Jiang, Feng Jia i Yong Zhen Zhang. "Cooling Rate, Microstructure and Property Studied of Spray Cooling of Heavy Shell Ring Rolling". Advanced Materials Research 941-944 (czerwiec 2014): 2414–19. http://dx.doi.org/10.4028/www.scientific.net/amr.941-944.2414.
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In the present work, detailed studies were made on the transformation characteristics, microstructure and mechanical properties of heavy shell ring (HSR) in the spray cooling process. The spray cooling device of HSR was designed. The 2.25Cr1Mo0.25V steel used in production of HSR for hydrogenation reactor was selected as the testing material. The simulation of spray cooling of HSR was carried out on ABAQUS. The constitutive model and continuous cooling transformation (CCT) diagram of 2.25Cr1Mo0.25V were determined. CCT diagram, metallograph and SEM results show that the bainite forms throughout the cooling rate range from 0.5 to 10 ℃/s, and martensite begins to be produced by increasing the cooling rate higher than 60℃/s; when the cooling rate is 10 ℃/s, with the increase of the deformation degrees, the ferrite grain size becomes small, the yield strength and tensile strength increase, the elongation decrease, So it is good for refining the grain to increase the deformation. The yield strength, tensile strength and elongation were obtained under different cooling technology.
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Varma, Surya J., i Jane H. Henderson. "Study on the Bond Strength of Steel-Concrete Composite Rectangular Fluted Sections". Advances in Civil Engineering 2020 (15.12.2020): 1–15. http://dx.doi.org/10.1155/2020/8844799.
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Concrete-filled steel tube (CFST) sections are structural members that effectively use the best properties of steel and concrete. Steel tube at the outer perimeter effectively resists tension and bending moments and also increases the stiffness of the section as steel has a high modulus of elasticity. The infilled concrete delays the local buckling of the thin outer steel tube. The interface bond strength plays a major role in the composite action of CFST sections. Provision of rectangular flutes on steel tube on CFST sections will improve the bond failure load and thereby the performance of CFST sections significantly. In this paper, the bond strength and displacement characteristics of steel-concrete composite sections are determined by incorporating rectangular shaped flutes into the steel tube. A total of five sections were tested to assess the influence of flutes on the bond strength. These tested sections are analyzed and are used to develop a finite element model using the finite element software ABAQUS version 6.13. The parameters chosen for the FE study are (i) type of flutes (outward and inward), (ii) D/t ratio (40, 60, and 80), (iii) number of flutes (2, 3, 4, 5, and 6), and (iv) dimension of flutes ((20 mm × 10 mm), (40 mm × 10 mm), and (60 mm × 10 mm)). Bond failure load is found to be higher for outward fluted sections compared to inward fluted and plain CFST sections.
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Strecker, Kurt, Carlos Augusto da Silva i Sérgio Luiz Moni Ribeiro Filho. "Experimental and Numerical Analysis of Cement Based Composite Materials with Styrofoam Inclusions". Open Construction and Building Technology Journal 10, nr 1 (28.06.2016): 431–41. http://dx.doi.org/10.2174/1874836801610010431.
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In civil engineering an increasing demand for lightweight concretes exists, because a lower density results in significant benefits for structural elements. Polystyrene foams may be used in the fabrication of lightweight concretes with a large density range. In this work, the influence of fine grained sand (<1mm) additions of 5, 10 and 20% on the properties of a composite consisted of cement with styrofoam inclusions of 20, 40 and 60% has been studied. Finite element analysis (FEA), using Abaqus software package, was carried out to predict numerically the effect of particle size and polystyrene fraction on the compressive strength of the composite materials. The composites were characterized by their density, porosity and compressive strength after 28 days. The density of the composites varied between 1250 and 1600 kg/m3 with a strength of 18 and 9 MPa for 20 and 60% of Styrofoam inclusions, respectively. The increase of the fraction of sand from 5 to 20% promoted the increase in bulk density and modulus of the composites. The effect of the addition of sand on the porosity and mechanical strength exhibited variation indicating the packing factor of the particles as the main responsible for this behavior. Based on the finite element analysis the amount of the stress in the composite increases with the increasing particle diameter. The composites investigated exhibited a uniform distribution of the polystyrene spheres, allowing their use for non-structural purposes.
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Ali, Adnan Falih, i Raad Abdulkhudhur Sehaib. "Effects of Bedding Types on the Behavior of Large Diameter GRP Flexible Sewer Pipes". Journal of Engineering 23, nr 1 (1.01.2017): 136–55. http://dx.doi.org/10.31026/j.eng.2017.01.09.
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Flexible pipes, such as GRP pipes, serve as effective underground infrastructure especially as sewer pipeline. This study is an attempt for understanding the effects of bedding types on the behavior of large diameter GRP flexible sewer pipes using three dimensional finite element approaches. Theoretical and numerical analyses were performed using both BS EN 1295-1 approach and finite element method (ABAQUS software). The effects of different parameters are studied such as, depth of backfill, bedding compaction, and backfill compaction. Due to compaction, an increase in the bedding compaction modulus (E’1) results in a reduction of both stresses and displacements of the pipe, especially, for well compacted backfill. An increase of (E’1) from 14MPa to 30MPa results in a reduction in stresses 40% and about 25% in displacements. Maximum reductions in stresses were found to be about 25% only while the reduction in displacement was found to be less than 10%. As backfill material compaction modulus (E’2) is increased from 14MPa to 40MPa, a maximum reduction in stresses within the pipe was found to be not less than 60% while the displacement reduces up to 65%.
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Ramalingam, Malathy, Poornima Mohan, Parthiban Kathirvel i Gunasekaran Murali. "Flexural Performance and Microstructural Studies of Trough-Shaped Geopolymer Ferrocement Panels". Materials 15, nr 16 (9.08.2022): 5477. http://dx.doi.org/10.3390/ma15165477.
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Geopolymer mortar is the best solution as an alternative to cement mortar in civil engineering. This paper deals with the effect of geopolymer mortar on the strength and microstructural properties under ambient curing conditions. In this research, geopolymer mortars were prepared with fly ash and steel slag (in the ratio 1:2.0, 1:2.5 and 1:3.0) as precursors with NaOH and Na2SiO3 as activator solution solutions (in the ratios of 0.5, 0.75 and 1.0) with concentrations of NaOH as 8 M, 10 M, 12 M and 14 M to study the compressive strength behaviour. From the experimental results, it was observed that the geopolymer mortar mix with the ratio of fly ash and steel slag 1:2.5, 12 M NaOH solution and the ratio of NaOH and Na2SiO3 0.5 exhibits the maximum compressive strength results in the range of 55 MPa to 60 MPa. From the optimized results, ferrocement panels of size 1000 mm × 1000 mm × 50 mm were developed to study the flexural behaviour. The experimental results of the flexural strength were compared with the analytical results developed through ABAQUS software. It was observed that the Trough-shaped geopolymer ferrocement panel exhibits 56% higher value in its ultimate strength than the analytical work. In addition to the strength properties, microstructural analysis was carried out in the form of SEM, EDAX and XRD from the tested samples.
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Deepak, MS, i VM Shanthi. "Lateral-torsional buckling capacity of Hybrid Double-I-Box Beams: A numerical approach". Advances in Structural Engineering 22, nr 3 (22.08.2018): 641–55. http://dx.doi.org/10.1177/1369433218795601.
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In this article, a parametric study on the lateral-torsional buckling performance of thin-walled cold-formed steel Hybrid Double-I-Box Beams through numerical analyses has been presented. These built-up beams have distinctive cross-section geometry; the presence of more section modulus at the flanges provides high resistance to flexural bending and the closed-box portion offers high stiffness to resist torsion and lateral buckling. Therefore, these beams can be used for longer spans. The nonlinear finite element analysis was performed using ABAQUS software. All the beams were modelled as ideal finite element models adopting simply supported boundary conditions and loads were applied as end moments. To acquire a large number of data, three varying parameters were considered namely, hybrid parameter ratio, that is, yield strength of flange steel to web steel (1.0, 1.3, 1.5 and 1.7); ratio of breadth to depth of the beam (4/6, 5/6, 6/6 and 7/6); and length of the beam (1.0, 2.5, 5.0, 10, 15, 20, 30, 40, 50 and 60 in m). The thickness of both the flanges and the webs were 2.5 mm. All these parameters alter the overall slenderness of the members. It is shown that at larger spans, Hybrid Double-I-Box Beams experience lateral buckling. The results obtained from the numerical studies were plotted on nondimensional moment versus nondimensional slenderness graph. These results were compared with the predictions using effective width method design rules specified in Euro codes EN 3-1-3 and buckling curve-d of EN 3-1-1, which was originally adopted lateral-torsional buckling capacities of hot-rolled steel ‘I’ sections, and the adequacy is checked. It was found that Hybrid Double-I-Box Beams has higher lateral-torsional buckling capacity than common ‘I’ or box sections. Hence, a new simplified design equation was proposed for determining lateral-torsional buckling capacity of Hybrid Double-I-Box Beams.
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Lu, Jingzhou, Tong Mou, Chen Wang, Han Huang i Wenyu Han. "Research on Hysteretic Behavior of FRP-Confined Concrete Core-Encased Rebar". Polymers 15, nr 12 (18.06.2023): 2728. http://dx.doi.org/10.3390/polym15122728.
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FRP-confined concrete core-encased rebar (FCCC-R) is a novel composite structure that has recently been proposed to effectively delay the buckling of ordinary rebar and enhance its mechanical properties by utilizing high-strength mortar or concrete and an FRP strip to confine the core. The purpose of this study was to study the hysteretic behavior of FCCC-R specimens under cyclic loading. Different cyclic loading systems were applied to the specimens and the resulting test data were analyzed and compared, in addition to revealing the mechanism of elongation and mechanical properties of the specimens under the different loading systems. Furthermore, finite-element simulation was performed for different FCCC-Rs using the ABAQUS software. The finite-element model was also used for the expansion parameter studies to analyze the effects of different influencing factors, including the different winding layers, winding angles of the GFRP strips, and the rebar-position eccentricity, on the hysteretic properties of FCCC-R. The test result indicates that FCCC-R exhibits superior hysteretic properties in terms of maximum compressive bearing capacity, maximum strain value, fracture stress, and envelope area of the hysteresis loop when compared to ordinary rebar. The hysteretic performance of FCCC-R increases as the slenderness ratio is increased from 10.9 to 24.5 and the constraint diameter is increased from 30 mm to 50 mm, respectively. Under the two cyclic loading systems, the elongation of the FCCC-R specimens is greater than that of ordinary rebar specimens with the same slenderness ratio. For different slenderness ratios, the range of maximum elongation improvement is about 10% to 25%, though there is still a large discrepancy compared to the elongation of ordinary rebar under monotonic tension. Despite the maximum compressive bearing capacity of FCCC-R is improved under cyclic loading, the internal rebars are more prone to buckling. The results of the finite-element simulation are in good agreement with the experimental results. According to the study of expansion parameters, it is found that the hysteretic properties of FCCC-R increase as the number of winding layers (one, three, and five layers) and winding angles (30°, 45°, and 60°) in the GFRP strips increase, while they decrease as the rebar-position eccentricity (0.15, 0.22, and 0.30) increases.
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FU, WENYU, GUANG CHENG, RUOBING YAN i AIKE QIAO. "NUMERICAL INVESTIGATIONS OF THE FLEXIBILITY OF INTRAVASCULAR BRAIDED STENT". Journal of Mechanics in Medicine and Biology 17, nr 04 (18.05.2017): 1750075. http://dx.doi.org/10.1142/s0219519417500750.
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Braided stents are commonly used to treat cerebral aneurysm, but there is little information about the bending characteristic of braided stent used for cerebral aneurysm. This paper investigates how geometrical parameters of braided stent influence its flexibility. Eight groups of braided stent models with different geometries (i.e., nominal diameter, length, braiding angle, number of wires, diameter of wire, frictional coefficient among wires and porosity) were constructed. Parametric analyses of these models were carried out by using Abaqus/Explicit. When the nominal diameter varied from 2[Formula: see text]mm to 5.5[Formula: see text]mm, the forces required for flexural deformation decrease from [Formula: see text][Formula: see text]N to [Formula: see text][Formula: see text]N; when the axial length varied from 10[Formula: see text]mm to 40[Formula: see text]mm, the forces required for flexural deformation decrease from [Formula: see text][Formula: see text]N to [Formula: see text][Formula: see text]N; when the braiding angle increases from 30[Formula: see text] to 75[Formula: see text] (the number of wires is 48 and the diameter of the wire is 0.026[Formula: see text]mm), the forces required for bending deformation decrease from [Formula: see text][Formula: see text]N to [Formula: see text][Formula: see text]N; when the diameter of wires increases from 0.026[Formula: see text]mm to 0.052[Formula: see text]mm (the number of wires is 24 and the braiding angle is 60[Formula: see text]), the forces required for flexural deformation increase from [Formula: see text][Formula: see text]N to [Formula: see text][Formula: see text]N; and when the number of wires increases from 14 to 48 (the braiding angle is 75[Formula: see text] and the diameter of the wire is 0.026[Formula: see text]mm), the forces required for flexural deformation increase from [Formula: see text][Formula: see text]N to [Formula: see text][Formula: see text]N. From the data above it can be seen that the diameter of wires, the number of wires and braiding angle have a larger impact on bending characteristics of braided stent; and the axial length and nominal diameter have a smaller impact on bending characteristics of braided stent. Results of the present study may provide theoretical guidance for the design of self-expanding braided stent and its clinical practice.
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Roszak, Maciej, Dariusz Pyka, Mirosław Bocian, Narcis Barsan, Egidijus Dragašius i Krzysztof Jamroziak. "Multi-Layer Fabric Composites Combined with Non-Newtonian Shear Thickening in Ballistic Protection—Hybrid Numerical Methods and Ballistic Tests". Polymers 15, nr 17 (29.08.2023): 3584. http://dx.doi.org/10.3390/polym15173584.
Pełny tekst źródłaStreszczenie:
Multi-layer fabrics are commonly used in ballistics shields with a lower bulletproof class to protect against pistol and revolver bullets. In order to additionally limit the dynamic deflection of the samples, layers reinforced with additional materials, including non-Newtonian fluids compacted by shear, are additionally used. Performing a wide range of tests in each case can be very problematic; therefore, there are many calculation methods that allow, with better or worse results, mapping of the behavior of the material in the case of impact loads. The search for simplified methods is very important in order to simplify the complexity of numerical fabric models while maintaining the accuracy of the results obtained. In this article, multi-layer composites were tested. Two samples were included in the elements subjected to shelling. In the first sample, the outer layers consisted of aramid fabrics in a laminate with a thermoplastic polymer matrix. The middle layer contained a non-Newtonian shear-thickening fluid enclosed in hexagonal (honeycomb) cells. The fluid was produced using polypropylene glycol and colloidal silica powder with a diameter of 14 µm in the proportions of 60/40. The backing plate was made using a 12-layer composite made of Twaron® para-aramid fabrics with a DCPD matrix—not yet used in a wide range of ballistics. Then, numerical simulations were carried out in the Abaqus/Explicit dynamic analysis. The Johnson–Cook constitutive strength model was used to describe the behavior of elastic–plastic materials constituting the elements of the projectiles. For the non-Newtonian fluid, a Up-Us EOS was used. The inner layers of the fabric were treated as an orthotropic material. Complete homogenization of the sample layers was carried out, thanks to which each layer was treated as a homogeneous continuum. As a parameter of fracture mechanics for shield components, the strain criterion was used with the smooth particles hydrodynamics method (SPH). Then, the results of simulations were compared with the results of the ballistic test for both samples placed next to each other, which resulted in the formation of a multi-layer composite in one ballistic test subjected to impact loads during firing with a 9 × 19 mm Parabellum FMJ projectile with an initial velocity of 370 ± 10 m/s. The results of numerical tests are very similar to the ballistic tests, which indicates the correct mapping of the process and the correct conduct of layer homogenization. The applied proportions of the components in the non-Newtonian fluid allowed a reduction in the deflection compared to previous studies. Additionally, the proposal to use a DCPD matrix allowed to obtain a much lower deflection value compared to other materials, which is a novelty in the field of production of ballistic shields.
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Pereverzev, Alexander, Elena Everstova i Vladimir Tolkachev. "Hemodynamic index of animals with burning injury treated with “Acerbin”". BIO Web of Conferences 37 (2021): 00089. http://dx.doi.org/10.1051/bioconf/20213700089.
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Thermal injuries are wide spread among home pets and are represented as a recent problem of veterinary medicine because of the lack of anti-burn drugs adapted for use in veterinary medicine. In this regard, the aim of our work is to certify the vulnerary spray “Acerbin” for medical purposes in the treatment of thermal injuries of animals and to evaluate its therapeutic potency according to the dynamics of healing burn injuries and recovery of the blood cell composition. The research was carried out on 60 laboratory white mice. Thermal injuries of the skin integument on the dorsal surface of the croup were simulated; the “Acerbin” spray was further applied. To achieve the aim, the blood samples and planimetric measured tests of the area of burn defects were taken on the 3rd, 5th, 7th, 10th and 14th day of treatment. The samples were analyzed by the quantitative content of erythrocytes, thrombocytes, leucocytes and cHb (blood hemoglobin concentration) using an automatic hematological analyzer “Abacus vet 10”. Planimetric indicators of the area of burns were subjected to mathematical processing with the calculation of the rate of epithelization of the burn injury. The obtained hematological and planimetric digital indicators were processed by statistical methods of analysis, compared and then interpreted.
Streszczenia konferencji na temat "ABAQUS 60.10"
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Malomo, B. O. "A homogenized finite element analysis of the deformation of axially-loaded thin-walled epoxy/coir fibre-reinforced aluminum 6063 composite tubes". W Advanced Topics in Mechanics of Materials, Structures and Construction. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902592-50.
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Abstract. Metal-fibre hybridization is strategic to the development of efficient lightweight energy absorbing structures. In this study, the deformation of variable coir-fibre reinforcement volumes (10%-90%) hybridized at reinforcement thicknesses (10T, 15T and 20T) with aluminum alloy 6063 tubes was investigated from a continuum standpoint to unravel the underlying mechanisms of the composite’s performance potential. A representative volume element (RVE) was developed to determine the effective properties of coir-fibers based on Mori-Tanaka/Benveniste theoretical model in DIGIMAT 2017.0, while the aluminum alloy properties were defined by Johnson-Cook’s plasticity. Finite element (FE) simulations were implemented in ABAQUS Explicit Dynamics by deformable continuum elements to capture the damage initiation and evolution response based on the Hashin’s stiffness degradation failure criteria and the strength-based cohesive zone, traction-separation law. Incidental high peaks and unstable buckling loads at the onset of crushing was significant for 10T and 15T tubes with 10-30% and 80-90% reinforcement concentrations (Vf) relative to the low frequency of fluctuations at 40-70%, Vf. Axisymmetric to non-asymmetric transformations occurred with relative significance for the tubes as the resistance to global bending increased with reinforcement thickness. The interaction between the tube walls and reinforcement layers in preventing the formation of complete folds notably increased with 15T and 20T tubes at 60% fiber concentration, where the extensional collapse by progressive delamination of the 20T tubes improved the buckling resistance at densification. In agreement with FE simulations, experimental stress-strain plots at 60% Vf, confirmed that 20T tubes indicated wider plateau region of stable crushing to underscore observed high capacities for energy absorption.
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Linayao, Floyd, i Raymond K. Yee. "Dynamic Impact Simulation Study of Tubeless Pneumatic Tires". W ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-67123.
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Traditionally speaking, prototype tires are designed, and then tested on an experimental basis to evaluate performance. Using finite element analysis instead allows tire design parameters to be modified at will and underperforming architectures to be ruled out. This paper characterizes the dynamic response of a tubeless pneumatic vehicle tire as it is exposed to sudden impact and determines conditions under which failure would occur. Three cases were studied using a 175SR14 passenger tire, since passenger tires are most commonly used and impacts are more substantial on smaller tires. ABAQUS finite element program was used to perform nonlinear transient dynamic three-dimensional finite element analyses for three commonly tire encountered conditions. The first case, direct curb impact, determined that a safe inflation pressure range for tire velocities exists between 10 and 60 km per hour (kph). The second case, angled curb impact, found a smaller range of 10 to 40kph. The third case, impact with a pothole, found that at low inflation pressures, less stress is produced at higher velocities; increasing inflation pressure results in a transition point, causing larger stresses to be produced at higher velocities. From these analyses, several conclusions are drawn: inflation pressures below 100KPa do not produce a useful relationship between tire velocity and stress; thicker sidewalls help shield the tire from impact failure; and it is better for the tire to accelerate past a pothole in the 30 to 70kph range.
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Natarajan, Valliyappan David, i Arif Ashraf Ayob. "Effect of Ovality on the Collapse Pressure of a Subsea Pipeline at High Outer Diameter-to-Wall Thickness Ratios". W ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-50945.
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Subsea pipelines are primarily used in the transportation of oil and gas from the excavation site to the oil refinery. These pipelines are usually put under immense internal and external ambient pressures during their operation. The pipelines are therefore designed to account for the supported pressure and to ensure lower in-service failure probability. However, manufacturing issues arising from precision of machine tools and residual stresses in raw materials tend to cause the physical pipes to be geometrically imperfect. Imperfections including ovality (out-of-roundness), uneven wall thickness and longitudinal eccentricity (conical sections) may render the original design unsafe during the operation of the pipes. Experimental observations indicate that the collapse of pipeline pressure can be potentially overestimated if the geometrical imperfections are not considered in the design. Finite element analysis (FEA) that includes the geometrical imperfections in the pipeline model gives a better estimation of the collapse pressure. This study is aimed at modeling the ovality of a selected subsea pipeline and investigating its effect on the circumferential pressure distribution on the internal and external walls of the pipes using FEA. The collapse pressures of the pipeline are determined as a function of its outer diameter-to-thickness (D/t) ratios as well as the ovality. The type of ovality considered is full ring with 3%, 5% and 7% ovality. The FEA is performed using the Abaqus™ (ver. 6.12) software package and the collapse pressure for six D/t ratios between 30 and 80 (at a stepwise increase of 10) are determined based on the von Mises yield criterion of AISI 1009 carbon steel. Simulation results indicate that the collapse pressure reduces with the D/t ratio for all percentages of ovality. It is also observed that greater ovality gives smaller values of collapse pressure. For example, the collapse pressures of the pipe with D/t = 30 are 9.08 MPa, 8.64 MPa and 7.91 MPa for 3%, 5% and 7% ovality of the full ring type, respectively. The simulation results are compared against analytical results obtained using relevant formulas from two standards, i.e. BS 8010-3 and API 1111. The discrepancies between the simulation and API 1111 analytical results reduces for pipes with D/t = 60 and higher. The lowering of the collapse pressure would lead to unpredicted failure of pipelines if the effect of initial ovality in the pipe is not considered in the geometrical model for FEA. It is therefore imperative that ovality of pipes be kept to a minimum. Buckle arrestors may be placed on the pipe to limit the effect of ovality on the collapse pressure of the pipe.