Uniaxial compression test on ceramic green compact with bending consideration using digital image correlation

Caiuã Caldeira de Melo (1) , Matheus Furlan (2) , François Hild (3) , Nicolas Schmitt (3) , Rodrigo B. Canto (2)

1 UFSCar - Universidade Federal de São Carlos [São Carlos]
2 UFSCar - Federal University of São Carlos
3 LMT - Laboratoire de mécanique et technologie

A uniaxial compression test was performed on a green compacted alumina powder. Using Digital Image Correlation (DIC), displacement fields of two perpendicular surfaces of the specimen were measured showing unavoidable bending effect. A constitutive model was calibrated through three Finite Element Model Updating approaches. First, an analysis was performed using average axial strains assessed via DIC and resultant forces to identify the constitutive model. Then, a plane stress analysis was conducted out using the displacements of the boundaries of the regions of interest for each camera separately to obtain the sought parameters. Last, a 3D analysis was carried out using the multi-point constraint method to link displacement fields of both surfaces. Because of bending, the first two approaches give rise to two sets of different parameters. The analysis that considers the 3D nature of bending leads to the set of parameters with the highest degree of confidence.

Mots clés: Uniaxial compression test; Bending; Green compact; DIC; FEMU

Domaines: Mécanique des matériaux [physics.class-ph]

Caiuã Caldeira de Melo, Matheus Furlan, François Hild, Nicolas Schmitt, Rodrigo B. Canto. Uniaxial compression test on ceramic green compact with bending consideration using digital image correlation. Powder Technology, 2020, 376, pp.136-148. ⟨10.1016/j.powtec.2020.08.002⟩. ⟨hal-02910819⟩