The present study investigates the thermomechanical simulation of powder bed fusion (PBF) process, focusing on characterization melt pool. With aim comprehensively understanding complex multi-physics phenomena inherent to PBF our objective is establish a robust and refined computational framework that capable systematic evaluation dynamic evolution pool geometry temporal characteristics across various stages its formation. For this purpose, Allen-Cahn phase field formulation integrated with...

Despite extensive studies on material models for fracture applicable to homogenous materials, the demand advanced numerical methods predict failure in multi-materials and functionally graded materials (FGMs) remains substantial. This study aims address this gap by using a phase-field approach analyzing crack development ductile FGMs via experimental methods. To account induced plastic deformations, we introduce elastoplastic framework within damage driving force. enables us analyze FGM...

In this work, the analogous treatment between coupled temperature–displacement problems and material failure models is explored within context of a commercial software (Abaqus®). The implicit gradient Lemaitre damage phase field are implemented utilizing underlying capabilities for problems. heat conduction equation made compatible with diffusive regularization such calculations carried out at point level. This bypasses need to implement explicitly weak form resultant from coupling momentum...

Metal Additive Manufacturing (MAM) technology has evolved significantly, transitioning from its initial role in rapid prototyping to becoming a pivotal component manufacturing industries. Renowned for versatility product design, tooling, and process planning, MAM production systems face the challenge of understanding intricate interplay processing parameters detecting solidification defects, such as hot cracking porosities. To address this challenge, we propose thermomechanical phase-field...

Traditionally, combination of equivalent plastic strain and stress triaxiality parameters are taken into account when performing characterization material ductility. Some well-established models like Lemaitre model, GTN based many others perform relatively well at high-triaxiality states but fail to give adequate answers low-triaxiality states. In this work, three damage presented, applied assessed a cross-shaped component. Concerning material, AA5182-O, corresponding characterized by an...

Utilization of the phase-field diffusive crack approach in prediction evolution materials containing voids is investigated herein. It has been established that ductile failure occurs predominantly due to nucleation, growth and coalescence micro-voids micro-cavities, which lead initiation propagation cracks till final material collapse. This study an attempt model internal degradation with Rousselier pressure-dependent plasticity law, assisted phase field for first time, order account...

The present contribution addresses the micromechanical and thermal analysis of directed energy deposition-manufactured, stainless steel 316L components by utilizing experimental numerical analyses. It has been established that a combination controlling process parameters, manufacturing environment microstructural anisotropies could adversely affect quality as-deposited parts. Among other factors, shape, size, distribution microvoids porosities could, to some extent, have deteriorating...

Additive manufacturing (AM) of metals proved to be beneficial in many industrial and non-industrial areas due its low material waste fast stacking speed fabricate high performance products. The present contribution addresses several known challenges including mechanical behaviour porosity analysis on directed energy deposition (DED) manufactured stainless steel 316L components. experimental methodology consisting metal procedure, hardness testing fractographic observations mini-tensile test...

In this work, experimental tests were carried out, under different loading conditions, in order to assess ductile failure criteria, namely based on GTN, Johnson-Cook or Lemaitre models and establish new proposals for improvement. Corresponding characterization damage parameters is performed by an inverse analysis procedure, using reference tests. Numerical simulations of a cross-shaped component are considered the models, results show similar trend related with fracture evidence.

Additive manufacturing (AM) has emerged as a highly promising technique, offering unprecedented possibilities for creating complex geometries and functional structures. However, harnessing the full potential of AM requires development robust computational framework capable capturing intricate multi-scale multi-physics nature process. The constitutive structural responses encountered in are particularly challenging to reproduce due behavior material involved. This research aims address these...

This study presents a microstructural model applicable to additively manufactured (AM) austenitic SS 316L components fabricated via direct energy deposition (DED) process. The is primarily intended give an understanding of the effect microscale and mesoscale features, such as grains melt pool sizes, on mechanical properties components. Based experimental observations, initial assumptions for numerical regarding grain size dimensions were considered. Experimental observations based...

In this work, the utilization of a phase-field ductile fracture model in failure analysis advanced steels is investigated. The importance potentially proven, for instance automotive industry, due to its light weight, which entails crucial role these structures. A third generation high strength USS CR980XG3™️ AHSS material considered perform analyses. For purpose, necessary data regarding stress distribution and patterns from digital image correlation tests are utilized subsequent numerical...

Ductile damage can be dealt with continuous descriptions of material, resorting, for example, to mechanic or micromechanical constitutive models. When it comes describe material behaviour near and beyond fracture these approaches are no longer sufficient valid continuous/discontinuous adopted track initiation propagation. Apart from more pragmatic solutions like element erosion remeshing techniques advanced based on the X-FEM concept, in particular associated non-local formulations, may...

Abstract In an effort to simulate the involved thermal physical effects that occur in direct energy deposition (DED) a thermodynamically-consistent of phase-field method is developed. Two state parameters, characterizing phase change and consolidation, are used allocate proper material properties each phase. The numerical transient solution obtained via finite element analysis. A set experiments for single tracks scanning were carried out provide dimensional data deposited cladding lines. By...