ECCOMAS 2024

Contribution to Virtual Testing of Robotic 3D Printed Structures from Biocomposites

  • Kovacikova, Janka (Linnaeus University)
  • Ahmed, Sheik Ali (Linnaeus University)
  • Pocorni, Jetro Kenneth (Linnaeus University)
  • Zaida, Osama (Linnaeus University)

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The study focuses on developing the theoretical, computational frameworks of tensile and three-point bending setups of structures made of biocomposite material UPM Formi 3D printed by ABB robotic arm. The aim is to speed up the material-to-product design loop. Material is UPM Formi and is considered transversally isotropic with values of a modulus of elasticity; Ex= Ey=3200 MPa and Ez=2000 MPa and tensile strength in x,y direction 32 MPa and z-direction 10 MPa. The printed layer is 0.5 mm high and 2 mm wide. Two different types of samples for three-point bending models (3PB_0deg and 3PB_90deg) and tensile testing (TT_0deg and TT_90deg) were considered. The samples with 0deg in the name were cut parallel, and those with 90deg were cut perpendicular to the print direction. Models for three-point bending are 200 mm long, 2 mm wide, and 50 mm high, with a beam span of 150 mm. Models for tensile testing are 250 mm long, 25 mm wide, and 2 mm thick. 3D solids and shell models are used and compared in terms of computational costs and complexity of models. X – FEM analysis is used assuming fracture mechanics principles and two crack initiation criteria are specified: maximum principal and nominal stress criterion. The fracture criterion is defined by considering the Virtual Crack Closure Technique (VCCT), which is similar to. The results are computational frameworks, models, simulations and FEA analysis of the considered structures. These models are the virtual versions of the experimental setups that will be executed shortly. The results from simulations are compared to experimental results, and models will be calibrated to obtain the digital twin of the experimental setup. These models will be further used to create multiscale simulations, where the material will be defined using the micromechanics approach and homogenization and representative volume element (RVE) methods.