کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
828500 | 1470299 | 2015 | 10 صفحه PDF | دانلود رایگان |
• We investigate the influence of soft-body impacts onto pre-damaged CFRP plates.
• Material delamination is simulated using a bilinear cohesive element failure model.
• Simulation results are validated with comparison to theory and test data.
• Tensile preload and plate compliance reduce the extent of impact damage.
This research investigates the influence of preload and boundary condition compliance on low-velocity impact damaged CFRP T800S/3900-2B plates subject to secondary higher-velocity soft-body impact (50 J, 75 J, 100 J). A bilinear cohesive element based delamination model combined with ply-based composite material failure was developed using LS-DYNA 971. Double Cantilever Beam (DCB), 3-point End-Notched Flexure (ENF), and Fixed Ratio Mixed Mode Bending (FRMMB) simulations validate the accuracy of the delamination model when compared with theory. The low-velocity impact simulations were shown to compare well with the results of drop-tower impact experiments and ultrasonic inspection data in terms of maximum impact force and projected delamination area. An investigation of boundary condition compliance in the direction of impact showed a reduction in peak impact force, interlaminar delamination and intralaminar failure with increasing coupon translation. High-velocity impact simulations based on the model with initial damage showed a reduction in interlaminar delamination damage with tensile preload when compared to compressive preload and unloaded cases for all impact energies.
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Journal: Materials & Design - Volume 83, 15 October 2015, Pages 848–857