Novel design of honeycomb hybrid sandwich structures under air-blast

Abstract

In this study, dynamic explicit analysis was performed to examine the air-blast performance of various hybrid sandwich designs in terms of face plate deflections and energy dissipation capacity under the conventional weapons effects program (CONWEP) air-blast loads ranging from 3 kg to 8 kg trinitrotoluene for stand-off distance ranges from 150 mm to 200 mm. The blast resistance of honeycomb sandwich configurations was evaluated using steel honeycomb with different core topologies, crushable Al foam-filled steel honeycomb, and steel or steel with 3D Kevlar/polypropylene laminate employing fiber metal laminate (FML) front face. For an accurate prediction of the deformation mechanism of all steel parts, the Johnson-Cook (J-C) model was used. The composite failure criteria of Hashin, Puck, and Matzenmiller were implemented to accurately examine the fiber and matrix damage behavior. The novel hybrid design of the honeycomb sandwich structure’s blast resistance is improved by the employment of foam-filled honeycomb, an FML front face, and a circular honeycomb core. In comparison to other sandwich configurations, a novel designed hybrid sandwich construction composed of foam filled circular honeycomb with FML front facing and steel back facing (FCH-1KP0.5) achieved the highest blast resistance due to its lowest face deflection with the smallest plastic dissipation energy.

Strain Rate Analysis of Efficient Honeycomb Sandwich Panels under Blast Load

“…The shock wave strikes the structure's top face plate in the rst stage, providing an impulse to the top surface. The upper plate travels downward in the second stage, while the core tries to oppose the movement of the top plate and slow it down [3,5]. In this step, core crushing takes place.…”

“…Metallic honeycomb sandwich panels (MHSP) have been extensively used as structural elements that provide protection against blast loading in a wide range of applications, especially in military and aircraft industries [1][2][3]. This is mainly owing to their unique characteristics, such as high bending stiffness with overall low density and high thermal isolation capacity [4][5][6]. Conducting experimental research in order to design the optimized sandwich panel is very expensive and time consuming.…”

Design and analysis of lightweight stiffened honeycomb metallic sandwich panels under high-intensity air blast

“…6 In the positive phase, the variation in pressure is represented by the modified Friedlander equation (1). The positive specific impulse (I P ) is indicated by the region under the positive phase curve, which is calculated using equation (2) 3 : …”

“…1,2 The stiffness and strength of the face sheets help to resist bending and deformation, while the thick core material can absorb energy and prevent the face sheets from collapsing. 3…”

“…1,2 The stiffness and strength of the face sheets help to resist bending and deformation, while the thick core material can absorb energy and prevent the face sheets from collapsing. 3 To mitigate the effects of air-blast attacks, various blast-resistant sandwich panels were implemented by many researchers. These measures aim to minimize the impact of the blast wave and protect people and infrastructure.…”