Explosive deformation when simulated

Hallow Guys, So recently vie been doing some simulations using Explicit dynamics to simulate deformation and stress on an auxetic materials, I'm using Student version and the resulted simulation always results in some sort of explosion occurring on the auxetic structure

Impactor = Bar, 0.13kg, 50m/s Stainless Steel

Auxetic Structure = 0.23kg, Fix support at base with displacement control on both faces for planar simulation

Im also using explicit materials with principle stress failure of Al6060-T6

Is there a way to overcome this?

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