Estimation of the Strain Rate Hardening of Aluminium Using an Inverse Method and Blast Loading

The dynamic behaviour of structures under
blast wave loading is increasingly studied due to the rising
risks of intentional and accidental explosions and the
development of new protective technologies and methods.
To ensure the efficiency of these protective measures, the
identification of the material behaviour under blast loading
is of utmost importance. This paper investigates the
feasibility of the identification of the strain rate hardening
of aluminium using an inverse method and blast loads. The
results of a series of tests on aluminium plates loaded by
means of an Explosive Driven Shock Tube are reported.
A numerical study is performed to develop a model that is
both in concordance with the experimental measurements
and suitable for loop implementation. The 3D high-speed
full-field measurements and finite element simulations
are used to accurately assess the dynamic response of the
plates. The identification is based on the Levenberg-Marquardt
formulation for damped least-squares solution. The
approach is virtually validated and its sensitivity to noise
is studied using virtual measurements from finite element
calculations. Then, experimental data are used for the
identification. The results obtained are within the range of
expected values based on literature.

Jaar van publicatie:2017

Trefwoorden:Blast wave, Finite element model, Full-field measurements, Inverse method, Strain rate hardening

Toegankelijkheid:Closed