RESEARCH ON IMPACT RESISTANCE BEHAVIOR OF TITANIUM/STEEL COMPOSITE PLATES WITH THE RIPPLE INTERFACE

In order to clarify the dynamic response, damage situation, and failure mode of titanium/steel corrugated composite plates and interfaces under impact loads, small energy (53 J） impact experiments were conducted on titanium/steel corrugated composite plates using a light air cannon. On the basis of verifying the effectiveness of the numerical calculation model, numerical simulations were conducted on composite plates under various velocities to study the impact mechanical response of composite plates and their interfaces under various energies. The results show that, under low energy impact conditions, the front of the corrugated composite plate shows plastic expansion damage, and the back plate has protrusions with cracks at the raised areas. The corrugated interface layer is tightly bonded and overall concave; cut the target plate along the impact center and observe that there are no cracks, delamination, or other damages on the cross-section. This is different from fiber reinforced composite laminates. There will generally be obvious delamination inside when there is barely visible damage on the impact surface. In numerical simulation, the cohesive force interface damage area of the corrugated composite plate under impact is less than that of the planar interface composite plate. When subjected to low energy impact, the absorption of bullet kinetic energy by the corrugated plate is mainly dominated by overall deformation energy absorption, and the damage to the titanium/steel composite plate at the corrugated interface is relatively small. Under various energy impacts, corrugated interface composite plates have tighter interface bonding, better structural integrity, and are less prone to damage compared to planar interface composite plates.