Accurate numerical prediction of ductile fracture and micromechanical damage evolution for Ti6Al4V alloy

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 void nucleation, growth and coalescence mechanisms. The onset of the coalescence is established by a criterion based onThomason's approach. The macroscopic results obtained by the implemented model demonstrate a strong ability to predict the experimental elastoplastic mechanical behaviour of the material across a full deformation range and different types of loadings. At the microscopic level, the predicted accumulated porosity ratio of the material matrix at fracture exhibits a good correlation with the experimental observations. The element deletion feature, activated when a certain damage threshold is reached, provides a physical description of the loss of load-carrying capacity of the material during fracture.

A Combined Experimental and Numerical Calibration Approach for Modeling the Performance of Aerospace-Grade Titanium Alloy Products

“…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.…”

“…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.…”

CEBs with GRC: Fabrication, characterization, modeling, and correlation with microstructural fracture features

“…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.…”

“…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.…”

Characteristics of the Side Surfaces and Edges of Welded Wire Meshes Used in the Construction of Welded Slotted Screens

“…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].…”