Determination of Johnson–Cook Plasticity Model Parameters for Inconel718

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Duration: 25m
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level:Intermediate

Determination of Johnson–Cook Plasticity Model Parameters for Inconel718

Course Content

Simulation Files

  • Tutorial Video
  • Modeling Files

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Who this product is for :

  • Mechanical Engineers
  • Engineering students

File collection

Simulation Files

  • Tutorial Video
  • Modeling Files

Student Ratings & Reviews

No Review Yet
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Description

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.

More information

  • This tutorial is ideal for those studying material deformation under extreme conditions or needing validated Johnson–Cook material parameters. The methodology used—combining experimental results with finite element calibration—offers a robust approach for simulating real-world FOD scenarios. It can be extended to other superalloys or similar aerospace applications with minor adjustments. The simulation is fully customizable and modifiable for other strain rates or temperatures.

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Material Includes

  • Package Includes the following items:
  • Simulation files:
  • Abaqus files (The INP files are applicable to all versions):
  • CAE
  • INP
  • JNL
  • Instructional video:
  • Concise 25-minute guide to model setup and outputs for foreign object damage simulation in Inconel718.

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