Analysis of the Elastoplastic Response in the Torsion Test Applied to a Cylindrical Sample

Abstract

This work presents an experimental and numerical analysis of the mechanical behavior of a fixed-end SAE 1045 steel cylindrical specimen during the torsion test. To this end, an iterative numerical–experimental methodology is firstly proposed to assess the material response in the tensile test using a large strain elastoplasticity-based model solved in the context of the finite element method. Then, a 3D numerical simulation of the deformation process of the torsion test is tackled with this previously characterized model that proves to be able to predict the development of a high and localized triaxial stress and strain fields caused by the presence of high levels of angular deformation. Finally, the obtained numerical results are analytically studied with the cylindrical components of the Green–Lagrange strain tensor and experimentally validated with the measurements of shear strains via Digital Image Correlation (DIC) and the corresponding torque – twist angle curve.

Torcímetro digital para teste de torção em materiais e avaliação dos parâmetros elasto-plásticos de cisalhamento

“…TORO et al [18] analisaram a resposta elasto-plástica de corpos de prova cilíndricos submetidos a ensaios de torção. A medição do ângulo de torção foi realizada através da correlação de imagem digital 2D, onde, não havendo variação do raio durante o ensaio de torção, a medição do ângulo de torção pode ser obtida através da projeção sobre um plano das sucessivas posições de um ponto sobre a superfície do corpo de prova.…”

Exploring Tunable Torsional Mechanical Properties of 3D‐Printed Tubular Metamaterials

“…properties. Nevertheless, torsion is particularly important for tubular structures, [43][44][45][46] such as nasal swabs reviewed in this work. In practical scenarios, the mechanical challenges faced by a nasal swab go beyond mere linear forces.…”

“…[ 32–42 ] However, most of the research on mechanical performance has focused on tensile, compressive, and bending tests, with little attention given to torsional properties. Nevertheless, torsion is particularly important for tubular structures, [ 43–46 ] such as nasal swabs reviewed in this work. In practical scenarios, the mechanical challenges faced by a nasal swab go beyond mere linear forces.…”