Numerical failure load prediction of curved composite beam under four-point bending: effect of stacking sequence and curvature radius

초록

This study presents a numerical investigation of the failure load of curved composite beams subjected to four-point flexural loading. Two key parameters were separately considered: (1) the stacking sequence and (2) the curvature radius of the composite beams. Delamination, identified as the predominant damage mode in curved composite laminates, was modeled in Abaqus (R) using the cohesive zone model (CZM). Additionally, failure loads and load-displacement curves were generated for comparative analysis. Beams with a higher number of unidirectional layers demonstrated greater critical bending loads. Specifically, the [0]20 sample exhibited the highest predicted failure load of 590.3 N, compared to 484.0 N for the [0/90]5S sample and 455.8 N for the [45/0/- 45/90/0]2S sample. Furthermore, the failure load increased significantly with larger curvature radii, ranging from 3.0 mm to 12.0 mm with 3.0 mm increments. The predicted failure loads were 394.8 N, 555.8 N, 782.4 N, and 1010.8 N for radii of 3.0 mm, 6.0 mm, 9.0 mm, and 12.0 mm, respectively. The simulation results showed good agreement with previous experimental data. Overall, the findings confirm that the CZM approach is effective for analyzing the out-of-plane strength of curved composite beams.

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