Papers abstract:

To simulate the foreign object damage (FOD) phenomenon in aircraft high-pressure compressor blades made of a nickel-based superalloy, the Johnson–Cook (J–C) plasticity model was employed. To accurately predict the material’s plastic behavior at 400 °C—the typical operating temperature of the blades—and under high strain rates (~10⁶ s⁻¹), the J–C model parameters (A, B, C, n, and m) were experimentally determined. Parameters A, B, and n were derived from quasi-static tensile tests and found to be 1108 MPa, 699 MPa, and 0.5189, respectively. The thermal softening parameter m was calculated as 1.2861 based on additional tensile tests conducted at a strain rate of 1 s⁻¹ at three elevated temperatures: 475, 550, and 625 °C. To determine the strain rate sensitivity parameter C, a steel ball was impacted onto a flat, precipitation-hardened Inconel718 specimen. The resulting crater was 3D scanned, and the impact event was simulated in Abaqus. By comparing the experimental and simulated crater profiles using a trial-and-error method, the optimal value of C was determined to be 0.0085.

Product Overview:
This simulation tutorial reproduces the high-strain-rate impact damage observed in Inconel718 blades due to foreign object damage (FOD) using Abaqus. The model is validated against 3D-scanned crater profiles from ballistic experiments. It provides researchers and engineers with a ready-to-use template for J–C parameter calibration and impact simulation. Key simulation steps include:

• Application of Johnson–Cook material model
• High-speed dynamic explicit simulation setup
• Symmetric FE modeling and mesh refinement at impact zone
• Comparison of experimental and simulated crater profiles

In this tutorial, ballistic impact simulations of a steel sphere on Inconel718 targets are simulated, according to data from the work of H.K. Farahani et al.