Abstract
The paper reports experimental results describing behaviour of the AM60 magnesium alloy under impact test. The material was examined at energy in the range from 170 to 690 J, using impact tower with the projectile of conical shape. Results are presented in a form of variations of accumulated energy, force, projectile velocity and its displacement versus time. The characteristic features appearing in courses of force and accumulated energy are illustrated. Fractography and microstructure of damage zones for distinguishing the alloy degradation are shown. The fracture regions of the material examined are represented by cracks and plug-shaped deformation.
Highlights
The magnesium alloys with respect of the specific low-value weight of 1.8 g/cm3 are becoming more and more popular materials, even in comparison to aluminium alloys (Musfirah and Jaharah 2011)
Mechanical behaviour of the AM60 magnesium alloy under impact loading was strongly related to the energy applied
For impact energy within range of 260–540 J the fracture zones of the material tested were represented by a few cracks and plug-shaped deformation
Summary
The magnesium alloys with respect of the specific low-value weight of 1.8 g/cm are becoming more and more popular materials, even in comparison to aluminium alloys (Musfirah and Jaharah 2011). It has to be emphasized that mechanical behaviour of the magnesium alloy strongly depends on its structure It can be observed by comparison of the tensile curve for MgAl6Mn to the characteristics of other magnesium alloys like MgAl2Si or MgAl5Mn. Significant difference between the yield point and ultimate tensile strength can be noticed (Hebben 2010). A relatively serious interest has been focused on the perforation testing where an impact between nondeformable projectiles and metallic or composite plates are analysed (Ambrosini 2015; Dey et al 2007; Godzimirski et al 2015; Mocko and Kowalewski 2013; Tomac et al 2008; Zhong et al 2016) Such tests are usually designed using special facilities (Borvik et al 2002a, b, 2003; Cheshire et al 2008; Gupta et al 2006, 2007). At relatively low impact velocity no external cracks appeared in the specimen impacted (Rusinek et al 2009), and just this case will be taken into account in the paper
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