PSI - Issue 37

Md Niamul Islam et al. / Procedia Structural Integrity 37 (2022) 217–224 Md Niamul Islam et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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was treated as a rigid object and the 3D plates were discretised using 8-node linear brick elements with reduced integration. The element size was 2 mm in the 50 mm inner circle (Fig. 4), while the rest of the layer was meshed with 4 mm elements. For interaction properties, the tangential behaviour was considered frictionless, and hard contact for pressure-overclosure was used for the normal behaviour with a default constraint-enforcement method. Table 2 summarises the properties of the plates used in the model ( – Young's modulus, – Poisson's coefficient, – shear modulus, – tensile strength, – compressive strength, – shear strength, – coefficient for stiffness proportional damping). Some estimated values were added at this stage, as further experimental tests need to be conducted to get the actual properties of the printed material.

Fig. 3. Experimental setup for ballistic impact tests.

Fig. 4. FE model configuration (dimensions in mm) for ballistic impact tests.

Table 2. Properties of plates in numerical simulation (*estimated values).

Properties 1 = 2 * 3 * 1 = * 2 = * 3 * 12 = * 13 * 23 1 = 2 * 3

Values

1.97 GPa 0.8 GPa

0.25

0.6 GPa 0.45 GPa 50 MPa 30 MPa