Articoli di riviste: "Simulations de rupture ductile"

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Rahafrooz, M., M. Sanjari, M. Moradi e Danial Ghodsiyeh. "Prediction of Rupture in Gas Forming Process Using Continuum Damage Mechanic". Advanced Materials Research 463-464 (febbraio 2012): 1047–51. http://dx.doi.org/10.4028/www.scientific.net/amr.463-464.1047.

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The Continuum Damage Mechanics is a branch of applied mechanics that used to predict the initiation of cracks in metal forming process. In this article, damage definition and ductile damage model are explained, and also ductile damage model is applied to predict initiation of fracture in gas metal forming process with ABAQUS/EXPLICIT simulation. In this method instead of punch, the force is applied by air pressure. In this study, first the ductile damage criterion and its relations are taken into account and, subsequently, the process of gas-aid formation process is put into consideration and ductile damage model for prediction of rupture area is simulated using ABAQUS simulation software. Eventually, the process of formation via gas on the aluminum with total thickness of 0.24 [mm] was experimentally investigated and the results acquired from experiment were compared with relating simulations. The effect of various parameters such as radius of edge matrix, gas pressure and blank temperature has been evaluated. Simulation was compared with experimental results and good agreement was observed.

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Chowdhury, S. "Finite element simulations of ductile rupture in a constrained metal foil". International Journal of Multiphase Flow 22 (dicembre 1996): 136. http://dx.doi.org/10.1016/s0301-9322(97)88479-0.

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Chowdhury, S. Roy, e R. Narasimhan. "Finite element simulations of ductile rupture in a constrained metal foil". Materials Science and Engineering: A 191, n. 1-2 (febbraio 1995): 27–37. http://dx.doi.org/10.1016/0921-5093(94)09645-7.

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Abakumov, A. I., I. I. Safronov, A. S. Smirnov, A. B. Arabey, A. G. Glebov, T. S. Esiev e B. A. Sarychev. "NUMERICAL SIMULATION OF A DROP WEIGHT TEST OF DUCTILE PIPE STEEL". Problems of strenght and plasticity 82, n. 4 (2020): 493–506. http://dx.doi.org/10.32326/1814-9146-2020-82-4-493-506.

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The processes in the metal sample of a supply pipeline realized under drop-weight tests (DWT, or DWTT according to ASTM) are studied. DWT is a proof test of the pipeline metal that should ensure high resistance of the pipeline against extensive destruction. Numerical simulation of DWT with the steel sample of full thickness was performed; the steel had К65 strength grade. Parallel finite-element computer code DANCO developed in RFNC-VNIIEF was used for simulations. A detailed description of the rupture formation process required a fine-enough mesh and a supercomputer. To carry out the numerical simulation of the process, the constants of the deformation diagram were used, obtained on the basis of static and dynamic tensile tests of samples at room temperature. A modified Gurson–Tvergaard–Niedelman (GTNm) model for macro-viscous steel destruction (ductile failure) was used to describe the strain and the destruction of the metal. The modification makes it possible to describe direct and oblique cuts and their combinations in case of ductile failure of small-size objects (rods, plates, shells). The calculated dependences of the movement of the crack tip on the movement of the load and the resistance force of the sample on the movement of the crack tip are presented. We have got a good agreement between the computations and experimental data with regard to the “force–displacement” strength parameter, the deformed profiles and macro-geometry of the ruptured sample after the tests. The computation results reveal the mechanics of the crack origination, start and propagation in the sample, describe the plastic-flow energy distribution in the process of dynamic destruction. The results of the work can be used in the development of the requirements and of the implementation conditions of the “tooled” DWT, and for numerical simulation of the extensive destruction at the main pipeline.

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Bernatowska, Edyta, e Lucjan Ślęczka. "Experimental and Numerical Investigation into Failure Modes of Tension Angle Members Connected by One Leg". Materials 14, n. 18 (7 settembre 2021): 5141. http://dx.doi.org/10.3390/ma14185141.

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This paper presents the results of experimental and numerical tests on angle members connected by one leg with a single row of bolts. This study was designed to determine which failure mode governs the resistance of such joints: net section rupture or block tearing rupture. Experimental tests were insufficient to completely identify the failure modes, and it was necessary to conduct numerical simulations. Finite element analysis of steel element resistance based on rupture required advanced material modelling, taking into account ductile initiation and propagation of fractures. This was realised using the Gurson–Tvergaard–Needleman porous material model, which allows for analysis of the joint across the full scope of its behaviour, from unloaded state to failure. Through experimental testing and numerical simulations, both failure mechanisms (net section and block tearing) were examined, and an approach to identify the failure mode was proposed. The obtained results provided experimental and numerical evidence to validate the strength function used in design standards. Finally, the obtained results of the load capacity were compared with the design procedures given in the Eurocode 3′s current and 2021 proposed editions.

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Troufflard, Julien, Guillermo Requena, Sandrine Thuillier e Éric Maire. "Ductile Damage in Tension and Bending for DP980 Steel Sheets". Key Engineering Materials 554-557 (giugno 2013): 110–17. http://dx.doi.org/10.4028/www.scientific.net/kem.554-557.110.

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The mechanical behavior of DP980 steel sheets of 1.7 mm thickness has been investigated with both tensile and bending tests. Free bending tests were performed on square samples of 60mm side. The bending tool has a sharp radius of around 0.4 mm and the sample simply lies on two rollers. Scanning electron micrography observations were performed in order to check the occurrence of cracks, that indicate the onset of rupture in bending. Moreover, X-ray microtomography observations were performed on smooth and notched tensile specimen, with a specific small-size geometry, and bending specimen. Maximum void volume fractions of 1.5 10-3were recorded and the influence of the triaxiality ratio was investigated, by changing the notch radius. In the case of bending, samples were cut in the bent area and void volume fraction distribution was analyzed along the sheet thickness. Material parameters for Gurson-Tvergaard-Needleman (GTN) model, associated with isotropic hardening and von Mises yield criterion, were identified from the tensile tests. Inverse identification was performed over the different sample geometries, showing that GTN model can not capture the triaxiality ratio influence. Finite element simulations of the bending test were then carried out, in order to compare experimental and predicted void volume fractions in the sheet thickness.

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Pradeau, A., Sandrine Thuillier e Jeong Whan Yoon. "Bending Behavior to Fracture of an Aluminium Alloy Involving Pre-Strain". Key Engineering Materials 725 (dicembre 2016): 495–501. http://dx.doi.org/10.4028/www.scientific.net/kem.725.495.

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The work associated to this abstract is focused on the modelling of an aluminium alloy under the shape of sheet. It characterizes the mechanical behaviour up to rupture of an AA6016 alloy, taking into account the anisotropy and the hardening of the metal. The mechanical tests on which the model is based on consist of uniaxial tension, simple shear and hydraulic bulging performed at room temperature up to rupture, except for the simple shear. The numerical model is constituted of three parts. The choice of the model is suited for ductile fracture and allows for high flexibility, thanks to a total of 21 material parameters. The material parameter identification is realised through an inverse methodology. The objective of such an approach is to minimize iteratively the gap between the experimental and numerical outputs. Validation of the results is then done with the help of bending tests. The bending tests are performed with and without pre-strain in tension prior to the air-bending. Different amplitudes of pre-strain allows to reach rupture or not in bending, thus giving the possibility to find the value of the parameter controlling the non-linear accumulation of the damage. The correlation between experiments and simulations is proved to be successful and gives a very good representation of the mechanical behaviour of the aluminium alloy studied.

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Foroozmehr, Fayaz, e Philippe Bocher. "On the ductile rupture of 13% Cr-4% Ni martensitic stainless steels". International Journal of Fracture 224, n. 1 (23 aprile 2020): 67–82. http://dx.doi.org/10.1007/s10704-020-00446-2.

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Fadly, Muhammad Syaiful, Anindito Purnowidodo e Putu Hadi Setyarini. "Karakteristik Fiber Metal Laminate Akibat Beban Impak Balistik Dari Peluru Kaliber 9 mm Full Metal Jacket (FMJ)". Jurnal Rekayasa Mesin 12, n. 1 (31 maggio 2021): 103. http://dx.doi.org/10.21776/ub.jrm.2021.012.01.12.

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<p class="Abstract"><span lang="EN-GB">Estimated damage levels from ballistics impact zone provide valuable information to make bulletproof materials more effective. Therefore, this study aims to determine the impact of ballistics including hole shape, hole depth, macro, and microstructure on fiber metal laminate. The characteristics of ballistics impact for each configuration target is obtained from experiment and comparison based on simulations with finite element method. Test experiments used short-barreled fire guns at a distance of 5 meters with a normal attack angle based on the National Institute of Justice standard. Simulation with Johnson-Cook plasticity models for aluminum plate and orthotropic material model for kevlar/epoxy. The experiment and simulation results showed that the projectile is able to perforate the first layer (aluminum plate) and the second layer (Kevlar/epoxy) while the last layer (backplate) is deformed to form a bulge. The aluminum plate is perforated by the failure of petaling formation on the backside and spread of dimple fracture around the area of the petal which indicates ductile fracture while kevlar/epoxy is perforated by projectile with failure of fiber fracture on primary yarn, fiber pull-out, fiber stretching and fiber rupture.</span></p>

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Orlov, O., Éric Maire, Jérôme Adrien, Michael J. Worswick e David J. Lloyd. "Application of the Three-Dimensional Damage Percolation Model and X-Ray Tomography for Damage Evolution Prediction in Aluminium Alloys". Materials Science Forum 519-521 (luglio 2006): 1011–16. http://dx.doi.org/10.4028/www.scientific.net/msf.519-521.1011.

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A three-dimensional damage percolation model, which captures the effect of microstructural heterogeneity on damage evolution, has been developed to model damage initiation and propagation in materials containing second phase particles. It considers the three phenomena preceding ductile rupture of the material: void nucleation, growth, and coalescence. Threedimensional X-ray tomography is used to obtain measured three-dimensional second phase particle distributions in aluminum alloy sheet. Material damage evolution is studied within a tensile test simulation and compared to measured damage from an in situ tensile test utilizing X-ray tomography. Experimental and simulation results for material damage initiation and evolution are in good agreement.

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Stewart, Peter S., Stephen H. Davis e Sascha Hilgenfeldt. "Microstructural effects in aqueous foam fracture". Journal of Fluid Mechanics 785 (23 novembre 2015): 425–61. http://dx.doi.org/10.1017/jfm.2015.636.

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We examine the fracture of a quasi-two-dimensional surfactant-laden aqueous foam under an applied driving pressure, using a network modelling approach developed for metallic foams by Stewart & Davis (J. Rheol., vol. 56, 2012, p. 543). In agreement with experiments, we observe two distinct mechanisms of failure analogous to those observed in a crystalline solid: a slow ductile mode when the driving pressure is applied slowly, where the void propagates as bubbles interchange neighbours through the T1 process; and a rapid brittle mode for faster application of pressures, where the void advances by successive rupture of liquid films driven by Rayleigh–Taylor instability. The simulations allow detailed insight into the mechanics of the fracturing medium and the role of its microstructure. In particular, we examine the stress distribution around the crack tip and investigate how brittle fracture localizes into a single line of breakages. We also confirm that pre-existing microstructural defects can alter the course of fracture.

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Chabba, Hanae, e Driss Dafir. "Compression Behavior of Al-Mg Phases, Molecular Dynamics Simulation". International Journal of Engineering Research in Africa 46 (gennaio 2020): 15–31. http://dx.doi.org/10.4028/www.scientific.net/jera.46.15.

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Aluminum alloys development always exit in the manufacturing process. Al/Mg alloys have been attracted significant attention because of their excellent mechanical properties. The microstructural evolution and deformation mechanisms are still challenging issues, and it is hard to observe directly by experimental methods. Accordingly, in this paper atomic simulations are performed to investigate the uniaxial compressive behavior of Al/Mg phases; with different ratio of Mg ranging from 31% to 56%. The compression is at the same strain rate (3.1010 s⁻¹), at the same temperature (300K) and pressure, using embedded atom method (EAM) potential to model the interactions and the deformation behavior between Al and Mg.From these simulations, we get the radial distribution function; the stress–strain responses to describe the elastic and plastic behaviors of β-Al3Mg2, ε-Al30Mg23, Al1Mg1 and γ-Al12Mg17 phases with 31, 41, 50 and 56% of Mg added to pure aluminum, respectively. The mechanical properties, such as Young’s modulus, elasticity limit and rupture pressure, are determined and presented. The engineering equation was used to plot the stress-strain curve for each phase.From the results obtained, the chemical composition has a significant effect on the properties of these phases. The stress-strain behavior comprised elastic, yield, strain softening and strain hardening regions that were qualitatively in agreement with previous simulations and experimental results. These stress-strain diagrams obtained show a rapid increase in stress up to a maximum followed by a gradual drop when the specimen fails by ductile fracture. Under compression, the deformation behavior of β-Al3Mg2 and γ-Al12Mg17 phases is slightly similar. From the results, it was found that ε-Al30Mg23 phase are brittle under uniaxial compressive loading and γ-Al12Mg17 phase is very ductile under the same compressive loading.The engineering stress-strain relationship suggests that β-Al3Mg2 and γ-Al12Mg17 phases have high elasticity limit, ability to resist deformation and also have the advantage of being highly malleable. From this simulation, we also find that the mechanical properties under compressive load of ε-Al30Mg23 phase are evidently less than other phases, which makes it the weakest phase. The obtained results were compared with the previous experimental studies, and generally, there is a good correlation.The Al-Mg system was built and simulated using molecular dynamics (MD) software LAMMPS (Large-scale Atomic/Molecular Massively Parallel Simulator).

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Farayibi, P. K., M. Blüm e S. Weber. "Hard Cladding by Supersolidus Liquid Phase Sintering: An Experimental and Simulation Study on Martensitic Stainless Steels". Metallurgical and Materials Transactions A 51, n. 11 (26 agosto 2020): 5818–35. http://dx.doi.org/10.1007/s11661-020-05953-4.

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Abstract Martensitic stainless steels are suitable for diverse structural applications but degrade when subjected to wear-prone activities in service. To enhance their service life, the densification of high Cr, martensitic, X190CrVMo20-4-1 tool steel powder on two different martensitic stainless steel substrates via supersolidus liquid-phase sinter (SLPS) cladding was investigated. The objective was to assess the influence of the difference in compositions of the martensitic stainless steels employed as substrates on the interfacial diffusion, microstructure, hardness and bonding strength of the steel-to-steel claddings. Computational thermodynamics and diffusion simulations were employed to supplement experimental findings. Owing to interdiffusion, a M7C3 carbide-free, banded region exists in the X190 adjacent to the interface with the width dictated by chemical potential gradient of carbon. The hardness of the substrate was lower near the interface region because of carbon enrichment, which promoted the presence of retained austenite. An interfacial strength of 798 MPa was achieved with fairly ductile X190 matrix near the cladding interface as the fracture surface was characterized by mixed fracture modes of dimple rupture and cleavage with localized quasi-cleavage features. Experimental observations and computational simulations are in agreement. The implications of the SLPS cladding technique are discussed in the context of tool development.

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Sun, Lihui, Yaxin Long, Xing Li, Zhixin Jiang, Yu Fan, Zongze Wang e Xiangang Han. "Effect of Loading Rate on the Mechanical Properties of Weakly Cemented Sandstone". Sustainability 15, n. 3 (2 febbraio 2023): 2750. http://dx.doi.org/10.3390/su15032750.

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Weakly cemented rocks are characterized by low strength, loose structure, and easy disintegration. High-intensity mining activities can damage and rupture such rock bodies and induce damage, such as flaking and roofing on roadways. To reveal the mining intensity influence on the weakly cemented rocks’ deformation and damage, a numerical particle flow model of weakly cemented sandstone was established based on particle flow theory. Uniaxial compression simulation tests were conducted at four loading rates of 0.01, 0.1, 0.5, and 1 mm/min to study the weakly cemented sandstone’s stress–strain relationship, damage rupture, acoustic emission, and energy evolution. The results show that, with an increased loading rate, the uniaxial compressive strength of weakly cemented sandstone increases exponentially, and the rupture mode transforms from brittle damage to ductile damage; the greater the loading rate, the greater the degree of damage and crushing range of the rock. Further, with an increased loading rate, the peak hysteresis of rock acoustic emission events decreases, and the number of events increases; the energy accumulated in the rock increases, thus intensifying the degree of rock damage. Therefore, the possibility of engineering disasters should be considered when conducting high-speed underground mining activities.

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Bressan, José Divo, Luciano Pessanha Moreira, Maria Carolina dos Santos Freitas, Stefania Bruschi, Andrea Ghiotti e Francesco Michieletto. "Modelling of Forming Limit Strains of AA5083 Aluminium Sheets at Room and High Temperatures". Advanced Materials Research 1135 (gennaio 2016): 202–17. http://dx.doi.org/10.4028/www.scientific.net/amr.1135.202.

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Present work analyses mathematical modelling to predict the onset of localized necking and rupture by shear in industrial processes of sheet metal forming of aluminium alloy 5083 such as biaxial stretching and deep drawing. Whereas the AA5083 sheet formability at room temperature is moderate, it increases significantly at high temperature. The Forming Limit Curve, FLC, which is an essential material parameter necessary to numerical simulations by FEM, of AA 5083 sheet was assessed experimentally by tensile and Nakajima testing performed at room and 400°C temperatures. Tensile test specimens at 0o, 45o and 90o to the direction of rolling (RD) and Nakazima type specimens at 0o RD of aluminium AA5083 were fabricated. Simple tensile tests at room and 400°C temperatures were performed to obtain the coefficients of plastic anisotropy and material strain and strain rate hardening behavior at different temperatures. Nakazima biaxial tests at room and high temperature, employing spherical punch were carried out to plot the limit strains in the negative and positive quadrant of the Map of Principal Surface Limit Strains, MPLS, of aluminium AA5083 sheet. The “Forming Map of Principal Surface Limit Strains”, MPLS, shows the experimental FLC which is the plot of principal true strains in the sheet metal surface (ε1,ε2), occurring at critical points obtained in laboratory formability tests or in the fabrication process of parts. Two types of undesirable rupture mechanisms can occur in sheet metal forming products: localized necking and rupture by induced shear stress. Therefore, two kinds of limit strain curves can be plotted in the forming map: the local necking limit curve FLC-N and the shear stress rupture limit curve FLC-S. Localized necking is theoretically anticipated to occur by two mathematical models: Marciniak-Kuczynski modelling, hereafter M-K approach, and D-Bressan modeling. Prediction of limit strains are presented and compared with the experimental FLC. The shear stress rupture criterion modeling by Bressan and Williams and M-K models are employed to predict the forming limit strain curves of AA5083 aluminium sheet at room and 400°C temperatures. As a result of analysis, a new concept of ductile rupture by shear stress and local necking are proposed. M-K model has good agreement with both D-Bressan models.

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Zhao, Yong Tao, Jun Hui Dong, Yong Lin Ma e Jun Wei Zhou. "Study on Q390 Steel High-Temperature Tensile Fracture Microstructure and Micro-Hardness". Advanced Materials Research 308-310 (agosto 2011): 918–22. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.918.

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Q390 steel owns lots of good mechanical properties, it is used in many fields. By means of Gleeble 1500D thermal simulation machine, high temperature tensile tests were carried out; by OM,SEM, the fracture pattern and the microstructure of different distance from the fracture were watched and analyzed; by means of hardness test, the micro-hardness of different distance from the fracture was measured. The results show that the rupture at different temperature belongs to ductile rupture, with distance increasing from the fracture, the microstructure changes from composition structure of martensite, bainite, residual austenite into base metal structure, the grain size is smaller and smaller. The fracture hardness increases firstly and decreases secondly when tensile temperature increases, it is up to the max when temperature is 1200°C, the value is 395HV; the micro-hardness increases firstly and decreases secondly with distance increasing from the fracture, the hardness is the max when distance is 10mm,8mm,10mm at 800°C,1000°C,1200°C tensile temperature, the max value is respectively 330HV,340HV,370HV.

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Tang, Yuye, Roberto Ballarini, Markus J. Buehler e Steven J. Eppell. "Deformation micromechanisms of collagen fibrils under uniaxial tension". Journal of The Royal Society Interface 7, n. 46 (6 novembre 2009): 839–50. http://dx.doi.org/10.1098/rsif.2009.0390.

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Collagen, an essential building block of connective tissues, possesses useful mechanical properties due to its hierarchical structure. However, little is known about the mechanical properties of collagen fibril, an intermediate structure between the collagen molecule and connective tissue. Here, we report the results of systematic molecular dynamics simulations to probe the mechanical response of initially unflawed finite size collagen fibrils subjected to uniaxial tension. The observed deformation mechanisms, associated with rupture and sliding of tropocollagen molecules, are strongly influenced by fibril length, width and cross-linking density. Fibrils containing more than approximately 10 molecules along their length and across their width behave as representative volume elements and exhibit brittle fracture. Shorter fibrils experience a more graceful ductile-like failure. An analytical model is constructed and the results of the molecular modelling are used to find curve-fitted expressions for yield stress, yield strain and fracture strain as functions of fibril structural parameters. Our results for the first time elucidate the size dependence of mechanical failure properties of collagen fibrils. The associated molecular deformation mechanisms allow the full power of traditional material and structural engineering theory to be applied to our understanding of the normal and pathological mechanical behaviours of collagenous tissues under load.

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Enakoutsa, Koffi. "An improved nonlocal Gurson model for plastic porous solids, with an application to the simulation of ductile rupture tests". Applied Mathematical Modelling 38, n. 11-12 (giugno 2014): 2791–99. http://dx.doi.org/10.1016/j.apm.2013.11.007.

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Ma, Li, Xiao Dong He, Zhao Hui Hu e Yue Sun. "Optimum Design, Microstructure and Mechanical Properties of Ti/Ti₃Al Multi-Layered Materials". Materials Science Forum 546-549 (maggio 2007): 1575–80. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.1575.

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This study concerned with the optimum design, microstructure and mechanical properties analysis of a multi-layered metal/intermetallic materials consisting of Ti and Ti3Al prepared by the electron beam physical vapor deposition (EB-PVD) technology. Based on fracture mechanics and numerical simulation method, the optimized microstructure of Ti-Ti3Al multi-layered materials has been obtained by analyzing the relation curve between structural parameters and work of fracture of materials, then dual-target evaporating method was used to evaporate Ti and Ti-47Al bar alternately to form Ti/Ti3Al thin sheet about 0.12mm thickness. Pattern and phase analysis by SEM and XRD showed that there was homogeneous and continuous interface between layers and the intermetallic layers were made up of α2 phase alloy. The tensile curve of Ti/Ti3Al microlaminates represented the characteristic of multi-layered materials and the maximal extensibility of sample as deposited reached 5.83% and the fracture appearance showed ductile rupture feature.

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Messabih, Fatima Zohra, e Benattou Bouchouicha. "Coupling between Welding Conditions and Thermal Cycling for Identification of the Mechanical Heterogeneity of a Weld Joint". Periodica Polytechnica Mechanical Engineering 62, n. 3 (11 maggio 2018): 226–32. http://dx.doi.org/10.3311/ppme.12065.

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The analyses device safety subject to pressure is based on the prediction at break junctions used for the design of this type of devices. The harmfulness analysis of existing defects on these devices makes indispensable the study of the rupture in these components. Various characterization tests (tensile tests, fatigue tests and tensile strength tests) were carried out at room and low temperatures on plates welded end to end and for the different directions of sampling.An estimate of the toughness in the three areas of a weld joint was made by passing from resilience to toughness in the ductile-brittle transition zone of materials. The temperature range of the tests was to provide measurements of the toughness the lower bearing to the beginning of the transition curve. The purpose of this work is to study the state both mechanical and microstructural aspects of the welded junction. The diagnoses used made it possible to deduce that the small thickness of the HAZ, makes the machining of the specimen difficult. Thereby, a mechanical simulation of the HAZ by registration of the thermal cycle that this area undergoes was necessary to be able to reproduce it and compare it with the actual HAZ.

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Bergheau, Jean-Michel, Jean-Baptiste Leblond e Gilles Perrin. "A new numerical implementation of a second-gradient model for plastic porous solids, with an application to the simulation of ductile rupture tests". Computer Methods in Applied Mechanics and Engineering 268 (gennaio 2014): 105–25. http://dx.doi.org/10.1016/j.cma.2013.09.006.

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Torabipour, Ahmadreza, Nima Asghari, Homa Haghighi, Shaghayegh Yaghoubi e Girum Urgessa. "Assessing Effectiveness of Shape Memory Alloys on the Response of Bolted T-Stub Connections Subjected to Cyclic Loading". CivilEng 4, n. 1 (30 gennaio 2023): 105–33. http://dx.doi.org/10.3390/civileng4010008.

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This study presents finite element analysis of double split tee (DST) connections with high-strength steel bolts and coupled split tee sections, to evaluate various cyclic response parameters and elements. The investigation included quantifying connection behavior and hysteretic response, damage indexes, and failure modes. Over 40 specimens were simulated in ABAQUS under cyclic loading, including shape memory alloy (SMA)-built specimens. In the post-analysis phase, the T-stub thickness, the T-stub yield strength, the bolt preload and bolt number, and the stiffener type and stiffener material for the most significant parts of the DST connection were calculated. Simulation results showed that a lower ultimate moment yielded fewer needed stem bolts. The energy dissipation (ED) capacity increased as the horizontal distance between the stem bolts decreased. Additionally, increasing the strength of the bolt and T-stub by 15% resulted in a 3.86% increase in residual displacement (RD) for the bolt and a 1.73% decrease in residual displacement for the T-stub. T-stub stiffeners enhanced ED capacity by 31.7%. SMA materials were vulnerable to mode 1 failure when used in T-stubs, bolts, or stiffeners. However, the use of SMA increased the rate of energy dissipation. Adding stiffeners to the T-stubs altered the failure indexes and improved the pattern of failure modes. In addition, stiffeners decreased the rupture and pressure indexes. As a result, the failure index of a T-stub shifted from brittle failure to ductile failure.

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Leblond, Jean-Baptiste. "Rupture fragile et rupture ductile". Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy 326, n. 4 (aprile 1998): 243–50. http://dx.doi.org/10.1016/s1251-8069(98)80033-x.

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Majid, F., e M. Elghorba. "Critical lifetime of HDPE pipes through damage and reliability models". Journal of Mechanical Engineering and Sciences 13, n. 3 (26 settembre 2019): 5228–41. http://dx.doi.org/10.15282/jmes.13.3.2019.02.0428.

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Damage models are not directly applicable on high-density polyethylene (HDPE) pipes. In this paper, static and strain-unified theory damage models are adapted to fit the HDPE case by substituting the dynamic tests’ endurance limits by preloading simulation through notch and stiffness evaluation. Then, tensile and burst tests are following up to evaluate the specimens’ residual life. Compared to virgin specimens, the rupture limit of old HDPE pipes’ specimens had dropped significantly and their elongation decreased from 275 mm to about 26 mm. The degradation of the seven categories of specimens are different. Indeed, the degradation is too noticeable, disappearance of the plastic phase, for the categories 6 and 7, which are in the bottom of the pipe. Then, a reduced plastic phase on the lateral categories 4 and 5 showing an important impact of degradations. Finally, a larger plastic phase for the categories 1 and 2 taken from the top of the pipe, showing a medium impact of degradation. Thus, the use of the stiffness factor, reflecting the variability of degradation of the different categories of specimens, and the thickness reduction as life fractions for both aged and neat HDPE specimens was possible. The developed strains damage model compared to static burst pressures’ one confirmed the damage stages and the critical life fraction of HDPE pipes. By comparing these models, the drastic change of HDPE pipes’ behavior, from a ductile to a brittle one, have been proved. These findings allowed us to find out the critical life fraction of neat and old HDPE pipes, which has been confirmed by comparing the burst pressure curves of a notched and an old pipe. The presented approach is cost effective allowing a deep analysis of HDPE pipes failure and damage quantification through simply made models based on static tensile and burst test instead of tedious and very costly dynamic ones.

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Noell, Philip J., Jay D. Carroll e Brad L. Boyce. "The mechanisms of ductile rupture". Acta Materialia 161 (dicembre 2018): 83–98. http://dx.doi.org/10.1016/j.actamat.2018.09.006.

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Guillot, Martin, Robert Ascuitto, Nancy Ross-Ascuitto, Kiran Mallula e Ernest Siwik. "Computational fluid dynamics simulations as a complementary study for transcatheter endovascular stent implantation for re-coarctation of the aorta associated with minimal pressure drop: an aneurysmal ductal ampulla with aortic isthmus narrowing". Cardiology in the Young 29, n. 06 (giugno 2019): 768–76. http://dx.doi.org/10.1017/s1047951119000751.

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AbstractBackground:Transcatheter stent implantation has been employed to treat re-coarctation of the aorta in adolescents and young adults. The aim of this work is to use computational fluid dynamics to characterise haemodynamics associated with re-coarctation involving an aneurysmal ductal ampulla and aortic isthmus narrowing, which created minimal pressure drop, and to incorporate computational fluid dynamics’s findings into decision-making concerning catheter-directed treatment.Methods:Computational fluid dynamics permits numerically solving the Navier–Stokes equations governing pulsatile flow in the aorta, based on patient-specific data. We determined flow-velocity fields, wall shear stresses, oscillatory shear indices, and particle stream traces, which cannot be ascertained from catheterisation data or magnetic resonance imaging.Results:Computational fluid dynamics showed that, as flow entered the isthmus, it separated from the aortic wall, and created vortices leading to re-circulating low-velocity flow that induced low and multidirectional wall shear stress, which could sustain platelet-mediated thrombus formation in the ampulla. In contrast, as flow exited the isthmus, it created a jet leading to high-velocity flow that induced high and unidirectional wall shear stress, which could eventually undermine the wall of the descending aorta.Summary:We used computational fluid dynamics to study re-coarctation involving an aneurysmal ductal ampulla and aortic isthmus narrowing. Despite minimal pressure drop, computational fluid dynamics identified flow patterns that would place the patient at risk for: thromboembolic events, rupture of the ampulla, and impaired descending aortic wall integrity. Thus, catheter-directed stenting was undertaken and proved successful. Computational fluid dynamics yielded important information, not only about the case presented, but about the complementary role it can serve in the management of patients with complex aortic arch obstruction.

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Besson, Jacques, Wolfgang Brocks, Olivier Chabanet e Dirk Steglich. "Ductile rupture of aluminum sheet materials". Revue Européenne des Éléments Finis 10, n. 2-4 (gennaio 2001): 401–15. http://dx.doi.org/10.1080/12506559.2001.11869259.

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Besson, J., D. Steglich e W. Brocks. "Modeling of plane strain ductile rupture". International Journal of Plasticity 19, n. 10 (ottobre 2003): 1517–41. http://dx.doi.org/10.1016/s0749-6419(02)00022-0.

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Chrzanowski, Marcin, e Jan Hult. "Ductile creep rupture of fibre bundles". Engineering Fracture Mechanics 28, n. 5-6 (gennaio 1987): 681–88. http://dx.doi.org/10.1016/0013-7944(87)90061-0.

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30

He, Junjing, e Rolf Sandström. "Application of Fundamental Models for Creep Rupture Prediction of Sanicro 25 (23Cr25NiWCoCu)". Crystals 9, n. 12 (29 novembre 2019): 638. http://dx.doi.org/10.3390/cryst9120638.

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Creep rupture prediction is always a critical matter for materials serving at high temperatures and stresses for a long time. Empirical models are frequently used to describe creep rupture, but the parameters of the empirical models do not have any physical meanings, and the model cannot reveal the controlling mechanisms during creep rupture. Fundamental models have been proposed where no fitting parameters are involved. Both for ductile and brittle creep rupture, fundamental creep models have been used for the austenitic stainless steel Sanicro 25 (23Cr25NiWCoCu). For ductile creep rupture, the dislocation contribution, solid solution hardening, precipitation hardening, and splitting of dislocations were considered. For brittle creep rupture, creep cavitation models were used taking grain boundary sliding, formation, and growth of creep cavities into account. All parameters in the models have been well defined and no fitting is involved. MatCalc was used for the calculation of the evolution of precipitates. Some physical parameters were obtained with first-principles methods. By combining the ductile and brittle creep rupture models, the final creep rupture prediction was made for Sanicro 25. The modeling results can predict the experiments at long-term creep exposure times in a reasonable way.

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Barthel, Étienne, Thierry Deschamps, Guillaume Kermouche, Christine Martinet, Gergely Molnar e Anne Tanguy. "Le verre : fragile ou ductile ?" Reflets de la physique, n. 74 (dicembre 2022): 46–51. http://dx.doi.org/10.1051/refdp/202274046.

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Les verres usuels, dits « silicatés », sont des matériaux irremplaçables car transparents, rigides et de faible cout. Mais ils ont un talon d’Achille : leur résistance mécanique, à tel point qu’ils sont l’archétype même du matériau fragile, qui reste élastique jusqu’à rupture. Cependant, à la fin des années 1940, on a observé avec étonnement que leur indentation à l’échelle du micromètre laisse une empreinte, trace incontestable d’une déformation plastique ! Réconcilier cette plasticité à l’échelle locale avec l’idée de rupture fragile reste une question ouverte, tant la description de l’écoulement plastique dans les amorphes est complexe. La conjonction de nouvelles techniques expérimentales et numériques a permis des progrès que nous décrivons ici.

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Croix, Patrick, Franck Lauro, Jérôme Oudin e Jens Christlein. "Anisotropic damage applied to numerical ductile rupture". Revue Européenne des Éléments Finis 10, n. 2-4 (gennaio 2001): 311–26. http://dx.doi.org/10.1080/12506559.2001.11869254.

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33

Zhang, Ping, Yafei Shi, Hanqing Zhao, Fulin Zhang, Guoqiang Zhang e Sixian Rao. "Corrosion Failure of AISI4340 Steel in Oxygen-Containing Aqueous Chloride Solution". International Journal of Corrosion 2019 (23 gennaio 2019): 1–6. http://dx.doi.org/10.1155/2019/5318290.

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Stress corrosion cracking behavior of 4340 steel in oxygen-containing or chloride containing aqueous solution was researched, the tensile experiment results indicated 100°C deaerated distilled water, the rupture of 4340 steel mainly belongs to ductile fracture, the addition of oxygen or chloride would increase the SCC tendency of 4340 steel and transformed the rupture mechanism from ductile fracture to brittle rupture, the existence of oxygen or chloride would decreaseKISCCof 4340 steel in 100°C aqueous solution slightly, the simultaneous action of oxygen and chloride existed, and the simultaneous action would further increase the SCC tendency of 4340 steel in aqueous solution.

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34

Zhou, M., e R. J. Clifton. "Dynamic ductile rupture under conditions of plane strain". International Journal of Impact Engineering 19, n. 3 (marzo 1997): 189–206. http://dx.doi.org/10.1016/s0734-743x(97)00028-6.

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35

Marino, B., F. Mudry e A. Pineau. "Experimental study of cavity growth in ductile rupture". Engineering Fracture Mechanics 22, n. 6 (gennaio 1985): 989–96. http://dx.doi.org/10.1016/0013-7944(85)90038-4.

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36

Marini, B., F. Mudry e A. Pineau. "Ductile rupture of A508 steel under nonradial loading". Engineering Fracture Mechanics 22, n. 3 (gennaio 1985): 375–86. http://dx.doi.org/10.1016/0013-7944(85)90139-0.

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37

Li, Shaofan, e Cerup B. Simonsen. "Meshfree Simulations of Ductile Crack Propagations". International Journal for Computational Methods in Engineering Science and Mechanics 6, n. 1 (gennaio 2005): 1–19. http://dx.doi.org/10.1080/15502280590888612.

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38

Ando, K., Y. Takeda e K. Takezoe. "Brittle and Ductile Creep Rupture Life Prediction of 1CrMoV Steel Notched Thick Plates". Journal of Pressure Vessel Technology 112, n. 3 (1 agosto 1990): 225–32. http://dx.doi.org/10.1115/1.2928618.

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An analytical prediction method of brittle and ductile creep rupture life of 1CrMoV steel notched thick plate is proposed. Rupture time is evaluated as a sum of crack initiation life ti and crack growth life tp. In the case of ductile creep at high stresses, ti is evaluated by the creep deformation criteria. In addition, in the case of brittle creep at low stresses, ti is evaluated by Kachanov’s damage mechanics theory. Materials constants in Kachanov’s theory can be determined by the relatively short-term creep rupture test of notched specimen, etc., according to the present method. Creep rupture test, interrupted creep test, and micro-structural observation, have been used, which can explain the variety of material behavior, i.e., notch weakening at low stresses and notch strengthening at high stresses. In addition, in this analysis the analytically estimated creep crack initiation life corresponds to the time to creep void initiation just inside the notch root.

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Sakai, Paulo Roberto, Deivid Ferreira da Silva, Sandro Lombardo e Antonio Jorge Abdalla. "Comparison of Mechanical and Microstructural Characteristics in Maraging 300 Steel Welded by PAW and GTAW Processes Submitted to Repair". Advanced Materials Research 1135 (gennaio 2016): 255–64. http://dx.doi.org/10.4028/www.scientific.net/amr.1135.255.

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Maraging steels are a special class of ultrahigh-strength steels which presents a combination of high mechanical strength, excellent toughness, high temperature strength and corrosion resistance. The joint of sheets/plates by welding processes are fundamental for aeronautical and industrial products in addition Brazil has been developing technologies in welding ultrahigh-strength steels such as AISI 4340ESR and SAE 300M steels for its domestic space launch program and has currently decided for the replacement of these steels by Maraging 300 steel in some projects. In this work, we studied the welding process of the Maraging 300 steel for two different routes: Tungsten Inert Gas (TIG or GTAW) and Plasma Arc Welding (PAW). Filler additions were used for both processes. Procedure after any welding demands non destructive testing and sometimes non approved defects considering the usage of the product require for welding repair. Verification of the effects of this operation was made through a simulation of a welding repair for both types of welding. Specimens were submitted to heat treatment consisting of a solution annealing and aging and their microstructures were examined. The microhardness measurements were made on samples with and without repair characterized the fusion and heat affected zones. Specimens were submitted to tensile testing and the fractured surfaces were examined by a scanning electron microscope. Results of microstructure exam revealed the presence of austenite (γ) in FZ (Fusion Zone). After the welding repair simulation, a new different colored zone appeared in the HAZ (Heat Affected Zone) for both processes due to reheating of the sheet provided by the repair process. In the HAZ near FZ an important grain growth due to the heating occurred. Also, close FZ that was submitted to new heating due to repair it was noted an apparent growing of grain size relative to original grain size. The microhardness measurements showed that there is a reduction in hardness in the FZ and the region immediately (fusion line) compared to base material values. After the aging heat treatment a recovery of hardness values took place in these regions but the values themselves remain smaller than the base material. It was observed an increase of values of the microhardness in dark regions in the HAZ provoked by a phenomenon of aging locally due to the dissipation of the heat of the welding process and posterior repair. After aging, those differences disappeared. It was observed that there was not a large difference between the yield and strength limits considering both processes of welding, as well as between both situations after repair. It could be seen that the rupture began in the region near FZ and followed in the direction of the weld bead. The analysis of the fracture surfaces showed that this happened by ductile way, forming dimples.

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Rao, V. Bhujanga, R. Rajendran, A. V. Jaykumar e K. H. B. S. Satyanarayana. "Metallurgical Investigation of HSLA Steel Subjected to Underwater Explosion". Shock and Vibration 1, n. 4 (1994): 385–94. http://dx.doi.org/10.1155/1994/375854.

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The metallurgical behaviour of HSLA steel subjected to underwater explosion is of prime importance because of its structural applications in underwater vehicles. HSLA steel plates 300 × 250 × 4 mm were subjected to single and repetitive shock loadings and the point of rupture was identified. Test plates exhibited mode-I (large ductile deformation) and mode-II (tensile tearing) macroscopic failures. Electron micrographic and fractographic examination showed that the initiation of fracture was due to adiabatic shearing and the microscopic mode of failure was ductile. Plates subjected to single shock showed an increase in residual hardness and at the point of rupture it was approximately one-third higher than the initial residual hardness.

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Argyrou, Christina, Thomas D. O’Rourke, Chalermpat Pariya-Ekkasut e Harry E. Stewart. "Ductile iron pipeline response to earthquake-induced ground rupture". Earthquake Spectra 36, n. 2 (11 marzo 2020): 832–55. http://dx.doi.org/10.1177/8755293019891725.

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This article provides a comprehensive evaluation of ductile iron (DI) pipeline response to earthquake-induced ground deformation through the results of a large-scale testing program and a fault rupture test on a 150-mm DI pipeline with restrained axial slip joints. The test is used to validate a two-dimensional finite element (FE) model that accounts for soil–pipeline interaction with axial slip, pullout resistance, and rotation of pipe joints. The maximum strike-slip fault offset sustained by push-on, restrained, and restrained axial slip joints is presented as a function of the pipeline/fault crossing angle. DI pipeline performance is controlled by one of the following limit states; tensile, compressive, rotational joint capacity, or local buckling in the pipe barrel. A systematic FE assessment shows that pipelines with restrained axial slip joints accommodate 2–9 and 2–10 times as much fault offset as pipelines with push-on and restrained joints, respectively, for most intersection angles. The results of this work can be used for simplified design and to quantify the relative earthquake performance of different DI pipelines.

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SZUWALSKI, KRZYSZTOF. "NONHOMOGENEOUS BARS OPTIMAL WITH RESPECT TO DUCTILE CREEP RUPTURE". Engineering Optimization 25, n. 1 (agosto 1995): 13–27. http://dx.doi.org/10.1080/03052159508941252.

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Shi, Y. W. "Critical void growth for ductile rupture of steel welds". Engineering Fracture Mechanics 34, n. 4 (gennaio 1989): 901–7. http://dx.doi.org/10.1016/0013-7944(89)90226-9.

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Noell, Philip, Jay Carroll, Khalid Hattar, Blythe Clark e Brad Boyce. "Do voids nucleate at grain boundaries during ductile rupture?" Acta Materialia 137 (settembre 2017): 103–14. http://dx.doi.org/10.1016/j.actamat.2017.07.004.

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45

Simkins, D. C., e S. Li. "Meshfree simulations of thermo-mechanical ductile fracture". Computational Mechanics 38, n. 3 (25 novembre 2005): 235–49. http://dx.doi.org/10.1007/s00466-005-0744-8.

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46

Dion, Kristin, e Michael K. Neilsen. "Coupled thermal stress simulations of ductile tearing". International Journal of Fracture 198, n. 1-2 (marzo 2016): 167–78. http://dx.doi.org/10.1007/s10704-016-0093-y.

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47

Freddi, Francesco, e Lorenzo Mingazzi. "Phase Field Simulation of Laminated Glass Beam". Materials 13, n. 14 (20 luglio 2020): 3218. http://dx.doi.org/10.3390/ma13143218.

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The complex failure mechanisms of glass laminates under in-plane loading conditions is modelled within the framework of phase-field strategy. Laminated glass is widely used for structural purposes due to its safe post-glass-breakage response. In fact, the combination of several glass plies bonded together with polymeric interlayers allows overcoming the brittleness of the glass and to reach a pseudo-ductile response. Moreover, the post-breakage behaviour of the laminate is strictly correlated by the mechanical properties of the constituents. Ruptures may appear as cracks within the layers or delamination of the bonding interface. The global response of a glass laminate, validated against experimental results taken from the literature, is carried out by investigating a simplified layup of two glass plies connected by cohesive interfaces through an interlayer. Delamination of the adhesive interface is described, and crack patterns within the materials are fully described. Finally, the proposed approach put the basis for future comparisons with results of experimental campaign and real-life applications.

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Cai, M. B., X. P. Li e M. Rahman. "High-pressure phase transformation as the mechanism of ductile chip formation in nanoscale cutting of silicon wafer". Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 221, n. 10 (1 ottobre 2007): 1511–19. http://dx.doi.org/10.1243/09544054jem901.

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In nanoscale cutting of silicon wafer, it has been found that under certain conditions ductile mode chip formation can be achieved. In order to understand the mechanism of the ductile chip formation, experiments and molecular dynamics (MD) simulations have been conducted in this study. The results of MD simulations of nanoscale cutting of silicon showed that because of the high hydrostatic pressure in the chip formation zone, there is a phase transformation of the monocrytslline silicon from diamond cubic structure to both β silicon and amorphous phase in the chip formation zone, which results in plastic deformation of the workpiece material in the chip formation zone, as observed in experiments. The results further showed that although from experimental observation the plastic deformation in the ductile mode cutting of silicon is similar to that in cutting of ductile materials, such as aluminium, in ductile mode cutting of silicon it is the phase transformation of silicon rather than atomic dislocation that results in the plastic deformation.

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Coseru, Ancuta-Ioana, Valentin Zichil e Stefan Lupascu. "Appreciation of Triaxiality Influence in Plastic Deformation Accompanying Ductile Rupture". ACTA Universitatis Cibiniensis 69, n. 1 (20 dicembre 2017): 82–88. http://dx.doi.org/10.1515/aucts-2017-0011.

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Abstract In this paper, the authors propose a studying method for the deformation that appears before crack of ductile materials using the Lode parameter determined by the numerical calculation applied on simple models, verified in previous studies. In order to highlight the influence of the Lode parameter, the tests were performed at simple but also at compound tests. The necessity of these studies lies in the fact that the acknowledged models (the use of the integral J, the critical stress intensity factor Kc or the CPCD method) do not fully explain the phenomenon of deformation before breaking the elasto-plastic materials. The tests were imagined under the form of sets. Each set of tests was performed on smooth specimens and on specimens with a notch radius of 0.5, 2, 4 and 10 mm. Also, each set of tests was performed for pure tensile and combined tensile-torque test.

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Carassou, S., e B. Marini. "Effet d’échelle sur la rupture ductile d’un acier type A48." Revue de Métallurgie 91, n. 9 (settembre 1994): 1259. http://dx.doi.org/10.1051/metal/199491091259.

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