This article reviews recently developed methods for constitutive parameter identification based on kinematic full-field measurements, namely the finite element model updating method (FEMU), the constitutive equation gap method (CEGM), the virtual fields method (VFM), the equilibrium gap method (EGM) and the reciprocity gap method (RGM) Their formulation and underlying principles are presented and discussed These identification techniques are then applied to full-field experimental data obtained on four different experiments, namely (i) a tensile test, (ii) the Brazilian test, (iii) a shear-flexural test, and (iv) a biaxial test Test (iv) features a non-uniform damage field, and hence non-uniform equivalent elastic properties, while tests (i), (ii) and (iii) deal with the identification of uniform anisotropic elastic properties Tests (ii), (iii) and (iv) involve non-uniform strain fields in the region of interest

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Overview of Identification Methods of Mechanical Parameters Based on Full-field Measurements

Determination of mechanical properties and full-field strain measurements of rock material under dynamic loads

Effect of strain rate on ductile fracture initiation in advanced high strength steel sheets: Experiments and modeling

This paper introduces a data-driven process for designing and fabricating materials with desired deformation behavior. Our process starts with measuring deformation properties of base materials. For each base material we acquire a set of example deformations, and we represent the material as a non-linear stress-strain relationship in a finite-element model. We have validated our material measurement process by comparing simulations of arbitrary stacks of base materials with measured deformations of fabricated material stacks. After material measurement, our process continues with designing stacked layers of base materials. We introduce an optimization process that finds the best combination of stacked layers that meets a user's criteria specified by example deformations. Our algorithm employs a number of strategies to prune poor solutions from the combinatorial search space. We demonstrate the complete process by designing and fabricating objects with complex heterogeneous materials using modern multi-material 3D printers.

Design and fabrication of materials with desired deformation behavior

Characterisation of materials subjected to large strains by inverse modelling based on in-plane displacement fields

Viscoplastic parameter estimation by high strain-rate experiments and inverse modelling – Speckle measurements and high-speed photography

Material characterisation using high-temperature Split Hopkinson pressure bar

Fracture behaviour of Alloy 718 at high strain rates, elevated temperatures, and various stress triaxialities

The aerospace industry has an important role to play in lowering greenhouse gas emissions and thereby reducing its ecological footprint. Aerospace manufacturers do therefore push components and mat ...

Jörgen Kajberg

Papers

Characterisation of materials subjected to large strains by inverse modelling based on in-plane displacement fields

Viscoplastic parameter estimation by high strain-rate experiments and inverse modelling – Speckle measurements and high-speed photography

Material characterisation using high-temperature Split Hopkinson pressure bar

Fracture behaviour of Alloy 718 at high strain rates, elevated temperatures, and various stress triaxialities

Calibration and validation of three fracture criteria for alloy 718 subjected to high strain rates and elevated temperatures