Determination of Johnson–Cook Plasticity Model Parameters for Inconel718

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About Course

Papers abstract:

In order to simulate foreign object damage (FOD) phenomenon in aircraft high-pressure compressor blades made of a nickel-based super-alloy, Johnson–Cook (J–C) plasticity model was used. For prediction of material’s plastic behavior at temperature of 400 °C (working temperature of the blades) in the range of strain rates associated with the FOD phenomenon (in order of 106 s21), material parameters of A, B, C, n and m for the J–C plasticity model had to be determined experimentally. Parameters of A, B and n with values of 1108, 699 MPa and 0.5189, respectively, were obtained from quasi-static tensile tests. Moreover, m was determined to be 1.2861, also through quasi-static tensile tests with a strain rate of 1 s21 at three temperatures of 475, 550 and 625 °C. However, in order to determine C, firstly a steel ball was impacted on the surface of a flat specimen made of a precipitation-hardening alloy, and then, the impact site was 3D scanned to obtain the induced crater profile. Finally, the impact test (ballistic) was simulated using Abaqus, and a C value of 0.0085 was determined by comparing the actual crater profile with the one obtained from the simulation through a trial-and-error approach.

Product Overview:
This tutorial provides a step-by-step Abaqus simulation of cold spray deposition, where steel particles impact an Inconel718 target, replicating high-velocity impact conditions. Key simulation steps include:

  • Geometry setup: Particle (40 µm) and target (250 µm × 120 µm) with revolved symmetry.
  • Material assignment: J–C model for Inconel718 (A=1108 MPa, B=699 MPa, C=0.0085) and steel from Abaqus library.
  • Dynamic explicit analysis: 60 ns duration with ALE adaptive meshing.
  • Boundary conditions: Fixed target, particle velocity (−700 m/s), and thermal settings (298 K).
  • Post-processing: Stress, plastic strain, and temperature validation.

In this tutorial, particle-substrate interactions are simulated, according to data from the work of Farahani et al.

Course Content

Simulation Files

  • Tutorial Video
    00:00
  • Modeling Files

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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 22-minute guide to model setup and outputs for cold spray deposition

Audience

  • Civil Engineers
  • Mechanical Engineers
  • Engineering students

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