Identification of the plastic behavior of aluminum plates under free air explosions using inverse methods and full-field measurements

Prediction of microstructural evolution during hot forging

“…However, it can also be found that this model has numerous variables and parameter values which are hard to determine, as well as a low calculation efficiency. Therefore, in recent years, research on the internal-state-variable approach has been mainly focussed on parameters identification [56][57][58][59].…”

“…This accounts for physical aspects of the material behaviour, such as the constitutive behaviour and the dynamic microstructural development in the hot working of metals and alloys [43][44][45]. According to different scale lengths (SL), grain size, volume fraction of different types of grain, volume fraction of phases, sub-grain size, second-phase particles and dislocation density can be used as the mesoscale and microscale internal state variables (ISVs) [46][47][48][49][50][51][52][53][54][55][56][57][58][59]. It is worth noting that the ISVs are independent of each other, and therefore the flow stress cannot serve as the ISV, because the flow stress mainly depends on the evolution of the microstructure.…”

Response of Armour Steel Plates to localised Air Blast Load – A Dimensional Analysis

“…For example, Aune et al [23] observed the transient deflection of thin ductile steel and aluminium plates subject to spherical air blast laods at various stand-offs using Digital Image Correlation. The DIC technique was also used by Spranghers et al [24] to validate their numerical models. Minimising the discrepancy between the observed experimental and predicted numerical models (inverse modelling approach), the authors iteratively updated the material parameters required for different phenomenological models characterising J2 plasticity of the aluminium plate.…”

Explosive driven shock tube loading of aluminium plates: experimental study

“…The use of numerical tools to achieve this purpose is undeniably efficient, but a numerical model needs reliable material models and boundary conditions (among other points) in order to accurately predict the behaviour of a structure under blast loading. These material properties can only be derived and validated by experimental testing which can be usual tests in tension, compression, etc., or tests with more complex stress/ strain fields and using an inverse method [1][2][3][4]. The free air detonation of a high-explosive (HE) is a widely used way to generate a blast wave.…”

“…In the literature, several types of materials are considered such as composites [5][6][7][8][9][10][11][12][13], and metals [4,[14][15][16][17][18][19][20]. The blast load is generated using different techniques: free air detonation of a high explosive (HE) [4,5,12,13,18,19], using a gas driven shock tube [6][7][8][9][10][11]14] or an explosive driven shock tube (EDST) [6,15,20]. Several practical problems related to the use of free air explosions are reported in Refs.…”