Progressive damage induced degradation of mechanical properties in the hole surfaces during drilling processes of CFRP

The project describes a step‑by‑step method for building a three‑dimensional numerical model that tracks damage and the resulting loss of stiffness around drilled holes in carbon‑fiber reinforced polymer (CFRP). Drilling creates complex stress states that cause local damage, which weakens composite joints and reduces their performance. To capture this behavior, the research adds advanced damage‑initiation and damage‑evolution laws for both the individual plies and the interlaminar interfaces. These constitutive laws are embedded in a finite‑element framework, allowing the model to predict how the material’s stiffness matrix degrades around the hole. The simulation evaluates key drilling responses, including thrust force, cutting torque, and delamination. Validation is performed by comparing the simulated

force curves and damage zones with experimental measurements. The resulting tool helps engineers choose drilling parameters that minimize delamination and preserve the mechanical performance of CFRP components in aerospace and automotive applications.

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