Non-linear material characterization and numerical modeling of cross-ply basalt/epoxy laminate under low velocity impact.

The low velocity impact behavior of basalt/epoxy composites, seen as an eco-friendly replacement of glass-epoxy composites, has not been studied systematically so far. Here, the elastic elasto-plastic properties, strengths, intralaminar and interlaminar fracture energies were determined. The intralaminar energies were determined using compact tension and compression tests. The elasto-plastic properties needed in the plastic potential were determined using off-axis test. These properties are used in Finite Element (FE) code with an elasto-plastic damage model developed earlier to simulate the impact response of cross-ply laminates basalt/epoxy laminates. Low velocity impact (LVI) experiments at 10 J, 20 J and 30 J are performed on these composites. The FE simulation is successful in capturing force, energy, deflection histories and damage zones showing a close match to the experiments. A comparison of impact force history and damage area (ultrasonic C-scan) of basalt-epoxy laminates with glass epoxy laminates having same volume fraction shows nearly similar peak forces but the major axis of the ellipsoidal damage zone was bigger in glass/epoxy laminates. • Mechanical characterization of BUD laminates to evaluate moduli and strengths in tension, compression and shear. • Interlaminar (Mode-I and Mode-II) and Intralaminar fracture toughness properties for BUD laminates. • Cyclic off-axis experiments were performed for evaluating plasticity parameters. • Properties obtained from experiments were used as an input to the CDM constitutive model written in VUMAT. • LVI tests at 10 J, 20 J and 30 J were performed on cross-ply Basalt and glass laminates of similar volume fractions. • Total damage region around impact zone is captured using ultrasonic C-scan and fiber breakage using Micro-CT tomography. [ABSTRACT FROM AUTHOR]