Πλοήγηση ανά Συγγραφέα "Chamis, Christos C."
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Τεκμήριο Progressive fracture of [0/90/± θ]S composite structure under uniform pressure load(2008) Gotsis, Pascalis K.; Chamis, Christos C.; Gotsis, Christos K.; Mouratidis, EricosS-Glass/epoxy [0/90/ ± θ]S for θ=45°, 60° and 75° laminated fiber-reinforced composite stiffened plate was simulated to investigated for damage and fracture progression under uniform pressure. An integrated computer code was augmented for the simulation of the damage initiation, growth, accumulation, and propagation to fracture and to structural collapse. Results show in detail the damage progression sequence and structural fracture resistance during different degradation stages. Damage through the thickness of the laminate initiated first at [0/90/ ± 45]S at 15.168 MPa (2200 psi), followed by [0/90/ ± 60]S at 16.96 MPa (2460 psi) and finally by [0/90/ ± 75]S at 19.3 MPa (2800 psi). After damage initiation happened the cracks propagate rapidly to structural fracture.Τεκμήριο Progressive fracture of laminated composite stiffened plate(2009-04) Gotsis, Pascalis K.; Chamis, Christos C.; David, Kostantinos; Abdi, FrankLaminated fiber-reinforced composite stiffened plate with [0/90/±45]s plies made of S-Glass/epoxy are evaluated via computational simulation to study damage and fracture progression. The loads are pressure and temperature which varies from 21 to 65.5 °C (case I) and from 143.3 to 21 °C (case II). An integrated computer code is used for the simulation of the damage progression. Results show that damage initiation begins at low load level, with matrix cracking at the 0° (bottom and top) plies, fiber fracture at the bottom (0°) ply and interply delamination at the top (0°) ply. Increasing the applied pressure, the damage growth is expended resulting in fracture through the thickness of the structure. At this stage, 90 percent of the plies damage at applied pressure 15.306 MPa for the case I and 15.036 MPa for the case II. After this stage the cracks propagate rapidly and the structure collapses.Τεκμήριο Progressive Fracture of Laminated Composite Stiffened Plate(2007-08-01) Gotsis, Pascalis K.; Chamis, Christos C.; David, Kostantinos; Abdi, FrankLaminated fiber-reinforced composite stiffened plate with [0/90/±45]s plies made of S-Glass/epoxy are evaluated via computational simulation to study damage and fracture progression. The loads are pressure and temperature which varies from 21 to 65.5 °C (case I) and from 143.3 to 21 °C (case II). An integrated computer code is used for the simulation of the damage progression. Results show that damage initiation begins at low load level, with matrix cracking at the 0° (bottom and top) plies, fiber fracture at the bottom (0°) ply and interply delamination at the top (0°) ply. Increasing the applied pressure, the damage growth is expended resulting in fracture through the thickness of the structure. At this stage, 90 percent of the plies damage at applied pressure 15.306 MPa for the case I and 15.036 MPa for the case II. After this stage the cracks propagate rapidly and the structure collapses.