Defects in additively manufactured materials are one of the leading sources uncertainty mechanical fatigue. Fracture mechanics concepts useful to evaluate their influence, nevertheless, these approaches cannot account for real morphology defects. Preliminary attempts exploit a more comprehensive description defects can be found literature, by using Machine Learning. These notoriously data-hungry and neither physics laws nor phenomenological rules introduced assess soundness outcome. Hereby,...

In metal additive manufacturing (MAM), microstructural properties such as texture, residual stresses, and dislocation density have emerged key factors ruling the resulting mechanical performances. this study, cylindrical AISI 316L specimens, fabricated with laser powder bed fusion (LPBF), were tested under cyclic elastoplastic (EP) deformation using a constant strain amplitude to highlight evolution of stresses (RS), texture increasing number EP cycles, N, across hardening-softening (H–S)...

Cellular materials are an attractive option to improve mechanical properties in lightweight design. Given their complex geometry, cellular present small features at the meso-scale that make them highly susceptible fatigue failures. Fatigue of these has been receiving adequate attention only last few years, nevertheless, studies low cycle (LCF) behaviour extremely scarce and fragmented. In this study, 316L steel strut-based (FBCCZ) gyroid specimens were successfully manufactured by...

Abstract Low cycle fatigue (LCF) regime was experimentally studied for a 316L steel additively manufactured by laser‐powder bed fusion (L‐PBF), material widely used in sectors that require reliable durability analysis. Material cyclic elastoplastic behavior is described the Chaboche–Voce combined plasticity model, which displayed great degree of accuracy. The life modeled both invoking Manson–Coffin curve and other simplified models derived from static properties material; some showed...

Electrostatic actuated microbeams are frequently encountered in micro electro-mechanical systems (MEMS). The behaviour of these devices is characterized by electromechanical coupling, due to the mutual interaction between electrostatic field and deflection structure. Besides non-linearity geometrical non-linearities microstructure's large deflections can sometimes arise. In this work, a new FEM method based on sequential field-coupling (SFC) approach proposed, which loads gradually applied...

This work investigates the cyclic response and low-cycle fatigue behaviour of a CuAg alloy used in crystallizer for continuous casting lines. Therefore isothermal strain-based tests are first performed on specimens at different temperature levels (20 °C, 250 300 °C). The evolution stress-strain loops recorded during is parameter identification several nonlinear hardening models (nonlinear kinematic, isotropic). Cyclic data from experiments compared with results numerical simulations...

AISI 316L stainless steels are widely employed in applications where durability is crucial. For this reason, an accurate prediction of its behaviour paramount importance. In work, the spotlight on cyclic response and low-cycle fatigue performance material, at room temperature. Particularly, first aim work to experimentally test material use results as input calibrate parameters involved a kinematic isotropic nonlinear plasticity model (Chaboche Voce). This procedure conducted through newly...

This work describes the thermo-mechanical analysis of a copper mould for continuous steel casting. During process, molten passes through water cooled mould. The inner part component is subjected to huge thermal flux. Consequently large temperature gradients occur across component, especially in region near meniscus, and cause elastic plastic strains. aim this set up an industrially oriented approach assess fatigue life To achieve goal, three-dimensional finite element model analyzed...

An elastica-type analytical solution to the problem of large deflections slightly curved spring-strips, fixed at one end and loaded other with couples forces various directions, is obtained in this work. The main methods calculation elliptic integrals are studied, limits their applicability established as functions required degrees accuracy loading conditions spring-strips. results proposed method then compared particular cases already developed literature different approaches. It shown that...

In this work, the thermal distortion of a copper mould for continuous casting steel is investigated through numerical models based on finite element method. Special attention devoted to accuracy adopted material properties: several elasto-plastic models, with or without creep effects, are considered and compared into analysis. The early formation bulge close meniscus correctly simulated results in good agreement experimental data from literature.

Abstract Despite the wide use of copper alloys in thermo‐mechanical applications, there is little data on their cyclic plasticity behaviour, particularly for CuAg alloys. This prevents behaviour materials from being correctly described numerical simulations design purposes. In this work CuAg0.1 alloy used applications was tested by strain‐controlled loading at 3 different temperatures (room temperature, 250°C, 300°C). each test, stress‐strain cycles were recorded until had completely...

This work presents a one-dimensional harmonic finite element for the transient elasto-plastic analysis of axisymmetric structures loaded by non-axisymmetric thermal and mechanical loads. The exploits semi-analytical approach, based on Fourier series decomposition applied initial stress method is used non-linear solution analysis. As case study, proposed modelling two-dimensional circle under loadings rotating over its surface, which as an approximation roll in hot strip rolling. With...

In this article, the strain and stress analyses of functionally graded plates with circular holes that are subject to a uniaxial far-field traction load analytically considered. The Young's modulus is assumed vary linearly along radial direction around hole. adoption such type inhomogeneity variation can be justified as follows. Firstly, among all possible variations stiffness, linear one indeed simplest distribution. Surprisingly however, according our knowledge extent, associated elastic...

The need of a strong improvement productivity and reliability led the adoption advanced modeling techniques in design steelmaking plants components. In this work procedure based on finite element simulation is proposed order to perform durability analysis an anode for electric arc furnace. This component undergoes cyclic thermal loads, which also produce partial melting one part, meanwhile other maintained at almost constant temperature by cooling system. A simplified, but effective,...

Material property variation in non-homogeneous internally pressurized thick-walled cylinders is investigated within the context of dynamic programming theory. The material assumed to be linear, elastic, isotropic, and functionally graded radial direction. Based on plane stress hypothesis, a state space formulation given optimal control problem stated solved by means Pontryagin’s Principle for different objective functionals. Optimal Young’s modulus distribution found piecewise linear along...

In this work, the thermo-mechanical response of fire doors for naval application is considered. order to evaluate their behaviour, must undergo a standardized test. A realistic simulation heating process can be useful during design phase in reduce number prototypes constructed and tested. finite element model developed with aim capturing qualitative behaviour door its supporting frame. Two different types thermal analysis are considered: (1) transient (2) steady-state analysis. non-linear...

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Virtual prototyping techniques, generally based on numerical methods, are widely used in the process of designing an industrial product [...]

A finite element (FE) modelling approach is developed to reproduce the cyclic elastoplastic response and assess low cycle fatigue (LCF) life of two cellular materials (strut-based, gyroid) investigated in a previous experimental campaign. The different FE models (unit cell, one layer structure) compared terms computational cost accuracy. most satisfactory model further updated based on actual relative density fabricated materials. LCF assessment exploits volume-based strain energy (SED)...