We posited that the grain size dependence of tensile necking stress, as determined by Considère criterion for plastic instability, is a more meaningful characteristic Hall–Petch (H–P) effect than yield stress or 0.2% proof stress. An inverse square-root on was derived from dislocation dynamics-based constitutive model. In this model, enters indirectly via evolution density. Model predictions we...

This work investigates the mechanical behavior of nanocrystalline aluminum, with special focus on deformation mechanisms, using molecular dynamics simulations an interatomic potential parameterized by authors. To this end, four samples grain sizes ranging from 8,2 to 14,2 nm were constructed, each a volume 15 x 20 nm3. As expected, data tensile tests at strain rate 1,0 109 s−1 showed inverse Ha...

Welding is an essential fabrication step during the construction of pipelines using high-strength low-alloy steels. The base metal experiences a rapid thermal excursion in heat-affected zone, resulting modification microstructure and mechanical properties. In particular, coarse-grain zone closest to weld pool significance for integrity pipelines. present work, hardness were quantified from labo...

A new approach to modelling the microstructure evolution and yield strength in laser powder bed fusion components is introduced. Restoration mechanisms such as discontinuous dynamic recrystallization, continuous recovery were found be activated during of austenitic stainless steels; these are modelled both via classical Zener-Hollomon thermostatistical approaches. mechanism suggested for format...

This paper is proposing to the scientific community a new, original approach to the problem of the bio-mechanical and tensile study of the human cornea. By overturning the traditional “classic” approach, focusing mainly on the analysis of the collagen fibril composition and distribution, and on the yield stress of the Stroma only (in the wrong assumption of its alleged “major importance”, as a ...

To have an insight into the occurrence of inverse Hall-Petch relationship in ultrafine-grained (UFG) aluminum alloys produced by severe plastic deformation (SPD), ultra-SPD (i.e. inducing several ten thousand shear strains via high-pressure torsion, HPT) followed aging is applied to Al-La-Ce alloy. Average nanograin sizes 40 and 80 nm are successfully achieved together with strain-induced Lomer...