Abstract
The dynamic response of clamped circular steel plates was experimentally investigated under impact loading. The experiments were performed using a high energy drop weight machine with a 5 ton drop weight, which falls from a height of 0.8 m and results in a total impact energy of 40 kJ. Target plates of 10 mm thickness and 580 mm diameter were welded in three different geometrical configurations of weld elements on the lower side. The impact process was carried out using a hemispherical punch. The force was registered by strain gages on the punch. A full dynamic strain field measurement was applied on the tension side using two high speed cameras. The evaluation of the strain field was carried out with the speckle photography technique. The effect of cracks and welding on the deformation and failure behavior was studied using pre-cracked disks and plates with welded webs, welded circular discs and also with a weld seam only. The failure of the plates was registered using the high speed cameras and from the force signal. The results are analyzed and discussed regarding the behavior of the material and component under high rate loading.
Highlights
Under ballistic loadings, materials used in armor applications are exposed to different kinds of high rate stresses
The dynamic response of clamped circular steel plates was experimentally investigated under impact loading
A full dynamic strain field measurement was applied on the tension side using two high speed cameras
Summary
Materials used in armor applications are exposed to different kinds of high rate stresses. Due to the complex nature of the problem, the structural behavior under impact and blast loading is still not fully understood, despite a large number of studies have been carried out in the last few decades [1,2,3,4,5]. The most cracks, which cause catastrophic failure, are originated at welding joints Neglecting these weak points and investigating only the virgin armor plates itself would be inexpedient. The materials of armor plates are tested at high strain rates, and constitutive models are developed to describe the behavior under impact loading. A comparison of the measured and calculated forces can be carried out
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