Impact and compression-after-impact behavior of sandwich panel comprised of foam core and wire nets/glass fiber reinforced epoxy hybrid facesheets

Abstract

In this paper, we manufactured a novel sandwich panel that comprised of the foam core and the hybrid facesheets by vacuum-assisted resin infusion process. In the hybrid facesheets, the reinforcing phases are made of woven glass fabric cloth in company with wire nets, while the matrix is epoxy resin. Four categories of specimens with different wire nets contents are designed. To investigate the impact resistance ability of the designed sandwich panel, low-velocity impact tests are performed with respect to the contact load, absorbed energy, and failure mode. Compression-after-impact test is conducted to determine the residual mechanical properties of the postimpact sandwich panels. Digital image correlation technology is adopted to measure the strain distribution in the panels in compression-after-impact test. Results show that wire nets in the facesheet of the sandwich panel could enhance the energy absorb ability as well as the compression-after-impact strength significantly. Fiber/wire nets breaking, delamination, and foam core cracking are the main damage modes formed in the impact event, while the incident energy is mainly absorbed by wire nets breaking. In compression-after-impact test, bucking and delamination are the main damage modes, and the compressive stability is enhanced by the wire nets.

Experimental and numerical study on the low-velocity impact response of thermoplastic composite corrugated sandwich panels

“…Although all specimens produced significant buckling, they all spring back after unloading and structural integrity was maintained. This is not found in sandwich panels made of metal or thermosetting composite materials [11,14]. The reason may be that the corrugated structure has better toughness, and also the thermoplastic matrix provides some protection to the fibres [18].…”

“…To date, a substantial number of works on exploring the impact resistance of metallic and fibre-reinforced thermosetting composite structures have been reported [13][14]. Gibson et al [15] conducted low-velocity impact experiments on glass fiber/epoxy resin composite honeycomb sandwich panels at high impact energy.…”

Tensile behavior of the bolt‐jointed GFRP after low‐velocity impact

“…The unidirectional glass fiber (areal density of 450 g/m 2 , 0.34 mm per layer, tensile strength of 73 MPa) and vinyl ester resin (tensile modulus of 3.1 GPa and elongation of 3.6%) are used to fabricated GFRP laminates by vacuum‐assisted resin infusion (VARI), as shown in Figure 1A, which is carefully presented in our previous study. [ 31,32 ] The GFRP can be cured at room temperature and is stacked with 10 layers of glass fiber with three types of configuration, Ply A , Ply B , Ply C . The laminates, 3.4 mm in thickness, are cut into a uniform rectangle of 170 mm in size and 24 mm in width by a low‐speed diamond saw.…”

“…The unidirectional glass fiber (areal density of 450 g/m 2 , 0.34 mm per layer, tensile strength of 73 MPa) and vinyl ester resin (tensile modulus of 3.1 GPa and elongation of 3.6%) are used to fabricated GFRP laminates by vacuum-assisted resin infusion (VARI), as shown in Figure 1A, which is carefully presented in our previous study. [31,32] The GFRP can be cured at room temperature and is stacked with 10 layers of glass fiber with three types of configuration, Ply A C 0…”

Low velocity impact behavior of auxetic CFRP composite laminates with in-plane negative Poisson’s ratio

“…Many studies have been conducted by researchers worldwide to investigate the low velocity impact response of CFRP composites using numerical simulation methods where the failure modes of CFRP composites can be categorized into interlaminar damage and intralaminar damage and can be simulated by exploiting various combinations of damage initiation criteria and damage progression methods. 6,[14][15][16][17][18][19][20][21][22][23][24][25][26][27] The aim of this study is to utilize the well-validated, state-of-the-art, numerical simulation methods to explore the underlying mechanisms of enhancement of impact resistance imparted by the introduction of in-plane negative Poisson's ratio into CFRP composites.…”