Abstract:A CPB06-based Stewart-Cazacu micromechanical damage model is implemented and validated for Ti6Al4V material. It provides accurate numerical predictions in terms of macromechanical material response and damage accumulation. The SC11−TNT damage model is implemented in the finite element (FE) software Lagamine following a semi-implicit cutting plane algorithm and a well-chosen flow rule approach. The damage of the material is characterized by the porosity ratio contained within the material. It is modelled by voi… Show more
“…The relationship between the fracture deformation and the stress triaxiality of the investigated specimens is shown in Figure 7. This figure includes the data obtained from experimental stress triaxiality found with the Bridgman method and the data obtained through simulations with the SC11-TNT damage law previously reported in the literature [69]. The results of the micromechanics-based numerical simulation (SC11-TNT) match the local values of fracture deformation and stress triaxiality in the area where the fracture first appears.…”
Section: Johnson-cook Damage Parameters By Direct Methodsmentioning
confidence: 63%
“…The computational efficiency, stability, and robustness of the law was obtained with the verified convergence criterion and time step size to avoid convergence problems. More details regarding the implementation of the model and simulation parameters can be found in Rojas-Ulloa et al [69]. The Cazacu-plasticity related parameters are given in Table 4.…”
Section: Inverse Identification Of the Damage Parameters 𝑑 And 𝑑mentioning
Finite element modeling for designing and optimizing lightweight titanium aerospace components requires advanced simulation tools with adequate material modeling. In this sense, a hybrid strategy is proposed in this work to identify the parameters of the Johnson–Cook plasticity and damage laws using a combined direct-inverse method. A direct calibration method for plasticity law is applied based on the literature-reported data of strain-stress curves from experimental tensile tests at different temperatures and strain rates. The triaxiliaty-dependent fracture parameters of the Johnson–Cook damage law at reference conditions of strain rate and temperature (d1, d2, and d3) are calibrated with the direct method based on new data of experimental evolution of computed average fracture strain with the average stress triaxiality. The validation is performed with numerical results from an accurate micromechanics-based Ti64 model. The inverse calibration method is used to determine the strain rate and temperature-dependent damage parameters (d4 and d5) through large strain simulations of uniaxial tensile tests. The numerical results, including average strain and necking profile at fracture, are then utilized to calculate stress triaxiality by the Bridgman criterion for adjusting parameters d4 and d5. The calibrated model yields a 2.1% error for plasticity and 3.4% for fracture predictions. The experimental and simulated load-bearing capacity using the micromechanics damage model differed by only 1%. This demonstrates that the SC11–TNT model of Ti64 is reliable for identifying the Johnson–Cook damage law through the accurate use of inverse methods. The hybrid calibration strategy demonstrates the potential capability of the identified Johnson–Cook model to accurately predict the design load-carrying capacity of Ti64 aerospace components under different deformation rates and temperatures while accounting for material damage effects.
“…The relationship between the fracture deformation and the stress triaxiality of the investigated specimens is shown in Figure 7. This figure includes the data obtained from experimental stress triaxiality found with the Bridgman method and the data obtained through simulations with the SC11-TNT damage law previously reported in the literature [69]. The results of the micromechanics-based numerical simulation (SC11-TNT) match the local values of fracture deformation and stress triaxiality in the area where the fracture first appears.…”
Section: Johnson-cook Damage Parameters By Direct Methodsmentioning
confidence: 63%
“…The computational efficiency, stability, and robustness of the law was obtained with the verified convergence criterion and time step size to avoid convergence problems. More details regarding the implementation of the model and simulation parameters can be found in Rojas-Ulloa et al [69]. The Cazacu-plasticity related parameters are given in Table 4.…”
Section: Inverse Identification Of the Damage Parameters 𝑑 And 𝑑mentioning
Finite element modeling for designing and optimizing lightweight titanium aerospace components requires advanced simulation tools with adequate material modeling. In this sense, a hybrid strategy is proposed in this work to identify the parameters of the Johnson–Cook plasticity and damage laws using a combined direct-inverse method. A direct calibration method for plasticity law is applied based on the literature-reported data of strain-stress curves from experimental tensile tests at different temperatures and strain rates. The triaxiliaty-dependent fracture parameters of the Johnson–Cook damage law at reference conditions of strain rate and temperature (d1, d2, and d3) are calibrated with the direct method based on new data of experimental evolution of computed average fracture strain with the average stress triaxiality. The validation is performed with numerical results from an accurate micromechanics-based Ti64 model. The inverse calibration method is used to determine the strain rate and temperature-dependent damage parameters (d4 and d5) through large strain simulations of uniaxial tensile tests. The numerical results, including average strain and necking profile at fracture, are then utilized to calculate stress triaxiality by the Bridgman criterion for adjusting parameters d4 and d5. The calibrated model yields a 2.1% error for plasticity and 3.4% for fracture predictions. The experimental and simulated load-bearing capacity using the micromechanics damage model differed by only 1%. This demonstrates that the SC11–TNT model of Ti64 is reliable for identifying the Johnson–Cook damage law through the accurate use of inverse methods. The hybrid calibration strategy demonstrates the potential capability of the identified Johnson–Cook model to accurately predict the design load-carrying capacity of Ti64 aerospace components under different deformation rates and temperatures while accounting for material damage effects.
“…Some of the advantages of the Mohr-Coulomb failure criterion are related to the fact that it is widely used for brittle isotropic materials (such as rocks or concrete, etc.). These materials have asymmetric response in terms of tensile and compression stress-strain relationship, generally called strength differential effect (SD) [28,29]. Another more complex emerging SD failure criterion is for anisotropic material, called CPB06.…”
Section: Modeling Of Strength and Damage Of Quasi-brittle Cebsmentioning
confidence: 99%
“…Additional work is further required as the proposed mathematical models of Section 3.3 do not provide the necessary data to perform a deeper analysis of the macro/micro fracture morphology. For this purpose, a model based on micromechanics of porous materials, such as SC11-TNT [29] or the coupled theory of phase field and plasticity [32] should be investigated and evaluated.…”
Section: Microstructural Features Of Soil and Cebs Via Sem/eds Analysismentioning
“…Advanced manufacturing techniques such as powder metallurgy, selective laser melting (SLM), and computer-aided machining (CAM) have become widely adopted, enabling the precise production of metals with advanced properties [1][2][3][4]. However, that is not all-advanced numerical modeling and process optimization technologies allow for the improvement of manufacturing process parameters and waste minimization [5][6][7][8].…”
Welded resistance slotted screens, also known as slotted screens, are a special type of screen primarily used for the filtration and separation of liquids and dust. They are characterized by slots with parallel geometry and precisely defined sizes. The quality of the side surfaces and edges of welded wires determines the durability of the slotted screens made from them. This article presents the results of tests for four types of wires: two types of working profile wires made from austenitic-ferritic steel (duplex) and two types of supporting cross wires made from ferritic steel. The wire surfaces were characterized using a profilometer and atomic force microscopy. Basic roughness parameters Ra, Rz, and SAD (surface area difference) were determined. Surface observations of the working profiles were conducted using scanning electron microscopy. These studies allowed for the characterization of the working wire surfaces used in the production of slotted screens. At work, the results of surface roughness were analyzed based on three measurement methods for wires used in the production of welded slot screens. These results allowed for the identification of the most reliable method for characterizing the surface condition of such products.
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