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Metallographic study of non-homogenous armour impacted by armour-piercing incendiary ammunition
Highlights ► Incendiary effect does not influence the changes in microstructure. ► Impact causes plastic deformation in more ductile materials. ► Impact causes shear crack instability in less ductile materials. ► Crack propagation influences chipping on the inside of the perforated plate.
Abstract In this paper, the influence of impact and incendiary effect on the microstructure changes and crack development in non-homogenous add-on armour is studied. The main objective was to determine the parameters that may cause the yielding of the material, leading to a possible decrease in multi-hit resistance. For that purpose, patented wire fence and perforated plates made from two types of high strength steel, Hardox 450 and 50CrV4 tempered at 170°C were tested. Various techniques were applied: high speed video camera was used, visual macroanalysis, light microscopy, scanning electron microscopy and energy dispersive X-ray analysis. It was found that incendiary effect, being of a brief nature, does not have any influence on microstructure of the add-on armour. However, impact greatly influences crack development and propagation, which occurs in 50CrV4 steel, the material with lower ductility, diminishing its multi-hit resistance. In accordance with obtained results, non-homogenous add-on armour behaviour models were devised, describing the influence of material ductility and geometry on fracture mode, stresses and deformability.
Metallographic study of non-homogenous armour impacted by armour-piercing incendiary ammunition
Highlights ► Incendiary effect does not influence the changes in microstructure. ► Impact causes plastic deformation in more ductile materials. ► Impact causes shear crack instability in less ductile materials. ► Crack propagation influences chipping on the inside of the perforated plate.
Abstract In this paper, the influence of impact and incendiary effect on the microstructure changes and crack development in non-homogenous add-on armour is studied. The main objective was to determine the parameters that may cause the yielding of the material, leading to a possible decrease in multi-hit resistance. For that purpose, patented wire fence and perforated plates made from two types of high strength steel, Hardox 450 and 50CrV4 tempered at 170°C were tested. Various techniques were applied: high speed video camera was used, visual macroanalysis, light microscopy, scanning electron microscopy and energy dispersive X-ray analysis. It was found that incendiary effect, being of a brief nature, does not have any influence on microstructure of the add-on armour. However, impact greatly influences crack development and propagation, which occurs in 50CrV4 steel, the material with lower ductility, diminishing its multi-hit resistance. In accordance with obtained results, non-homogenous add-on armour behaviour models were devised, describing the influence of material ductility and geometry on fracture mode, stresses and deformability.
Metallographic study of non-homogenous armour impacted by armour-piercing incendiary ammunition
Balos, Sebastian (author) / Sidjanin, Leposava (author)
2011-02-26
8 pages
Article (Journal)
Electronic Resource
English
Metallographic study of non-homogenous armour impacted by armour-piercing incendiary ammunition
| British Library Online Contents | 2011