PSI - Issue 41

Muhammad Arif Husni Mubarok et al. / Procedia Structural Integrity 41 (2022) 282–289 Mubarok et al. / Structural Integrity Procedia 00 (2022) 000–000

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2. Benchmark Analysis The dynamic three-dimensional finite element simulation in this paper uses ABAQUS/Explicit to investigate the panel response. In such cases, TNT is usually modeled using the Johnson-Cook model. An elastoplastic material model was used with Johnson–Cook strain hardening and damage initiation. The model has been widely used in engineering because of its simpler form and requiring few parameters. � � �� � �� � � � � � � �� � ��� � �� �� � �� �� � � ∗ � � � (1) Where is the equivalent stress, � � � is the equivalent plastic strain, A , B , n , C , and m are the material parameters, � � is the reference strain rate and T is expressed as : ∗ � � ��� � � � �� � (2)

Fig. 2. Schematics illustrate the cross-section view of a hull plate and the terminologies.

The geometry of the simulated plate is 2500mm x 2500mm x 16.66 mm (shown in Figure 2). The geometry was taken based on the literature (Yuen et al., 2012) containing the dimensions of the Casspir Armour Personnel Vehicle. The explosion is assumed to have occurred from a land mine located at a distance of 0.41 m directly below the hull's surface. Two convergence studies were carried out on 180° plates subjected to a loading of 21 kg TNT. The mesh size of the model (shown in Fig. 3) is varied with element sizes of 0.02 m and 0.01 m.

Fig. 4. Stress-Strain curves of mild steel (Pan et al., 2018).

Fig. 3. Meshed model geometry created with ABAQUS.