Modelling the asymmetric tension–compression properties of additively manufactured alloys using continuum damage mechanics

Abstract

Additively manufactured parts often comprise internal porosities due to the manufacturing process, which needs to be considered in modelling their mechanical behaviour. It was experimentally shown that additively manufactured parts’ tensile and compressive mechanical properties are different for various metallic alloys. In this study, isotropic continuum damage mechanics is used to model additively manufactured alloys’ tension and compression behaviours. Compressive stress components can shrink discontinuities present in additively manufactured alloys. Therefore, the crack closure effect was employed to describe different behaviours during uniaxial tension and compression tests. A finite element model embedded in an ABAQUS’s UMAT format was developed to account for the isotropic continuum damage mechanics model. The numerical results of tension and compression tests were compared with experimental observations for additively manufactured maraging steel, AlSi10Mg and Ti-6Al-4V. Stress–strain curves in tension and compression of these alloys were obtained using the continuum damage mechanics model and compared well with the experimental results.

Flexural Properties of Additively Manufactured Structures Reinforced with Cellular and Fractal Patterns

“…However, this may not apply to additively manufactured parts, non‐Hookean, and composite materials that show different responses under tension and compression. [ 35,36 ] For these materials, different parts of the slope can be taken to characterize the mechanical properties of the material.…”

Assessing the influence of DMLS production process factors on fatigue resistance of Maraging steel MS1 in the finite life domain using ANN prediction abilities

“…8 The fundamental importance of the inhomogeneities for mechanical properties of materials was a motivation for concern and extensive studies of materials produced by DMLS. The majority of the research was focused on numerical 9 and experimental studies of the influence of the DMLS process parameters, 10 as well as the post-processing procedures, 11 to static tensile strength and surface quality 12 of AM products. Few papers deal with fatigue behaviour of AM materials, and these are mainly focused to light metals, dealing with influence of microstructure 13 and heat treatment 14 on fatigue resistance of aluminium alloys, as well as with general fatigue behaviour, 15 high-cycle fatigue, 16 influence of build orientation 17 and notch effects 18 on fatigue resistance of titanium alloys.…”