Forming limits evaluation Biaxial tensile test at room temperature Biaxial tensile tests using optimised cruciform speciments permit the measurement of linear and non-linear strain paths at room temperature, at quasi-static conditions or at high deformation rates. The straith path can be controlled by the displacement of the machine, using DIC system with 3D calibration. Deep…
Delayed fracture and H embrittlement Diffusion tests H diffusion testing Hydrogen permeation test, performed by electrochemical technique, is useful to determine hydrogen effective diffusivity and other hydrogen diffusion related parameters. Tests can be carried out also on coated sheet metals to evaluate the barrier effect of specific coating layers.Hydrogen permeation tests are performed by using…
Fatigue resistance Rapid Fatigue Test The fatigue test, known as the stiffness method, enables accurate determination of the fatigue limit and S-N curve of materials in a fast, cost-effective, and straightforward manner, requiring only three specimens. The methodology involves monitoring fatigue damage through the evolution of plastic strain during a stepwise fatigue test. Tests can…
Fracture toughness Fracture toughness evaluation Fracture toughness evaluation of thin metal sheets (1-3 mm of thickness), using mechanically notched or fatigue pre-cracked (DENT) specimens, and thick sheets (>3mm of thickness) by bending tests of fatigue pre-cracked (SENB) specimens, following fast and affordable methodologies based on the Essential Work of Fracture (EWF). The EWF is the…
Micro-mechanical characterisation Micro-tensile tests Micro-Tensile Tests (MTT) permit to locally assess basic tensile properties as yield stress,ultimate tensile strength, total elongation, reduction of area and uniform elongation. Furthermore, MTT can be used to study strain rate sensitivity in a wide range of temperatures. These miniaturised testing techniques can be successfully applied when insufficient volume of…
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Edge cracking and stretch-flangeability evaluation Optimised Hole Expansion Test (HET) An optimised HET methodology has been developed through the investigation of the main parameters affecting the hole expansion ratio (HE) such as clearance, tool wear, burr position and time from punch to expand. An experimental test configuration has been developed to objectively measure crack initiation…
