Abaqus VUMAT for the JHB and JH-2 Ceramic Model
VUMAT for the JHB and JH-2 Ceramic Model in ABAQUS
The purpose of the Abaqus VUMAT JHB and JH-2 Ceramic Model tutorial course is to learn, how to use Johnson-Holmquist (JH-2) and Johnson, Holmquist, and Beissel (JHB) built-in material models to simulate the failure behavior of brittle materials like ceramics.
- Johnson, Holmquist, and Beissel (JHB)
- Johnson and Holmquist (JH-2)
These models can be used to simulate the behavior of materials under high strain rate loading conditions, such as impacts.
Implementing Johnson-Holmquist Damage Models for Brittle Ceramics in Abaqus
The JHB and JH-2 models are continuum damage mechanics models used to simulate the failure of brittle ceramic materials. They are implemented in a VUMAT (user material) subroutine for Abaqus simulations to model the nonlinear behavior and damage of ceramics.
The JHB and JH-2 models are best suited for modeling the failure of brittle ceramic materials with linear elastic behavior up to failure and little or no plasticity. The VUMAT JHB and JH-2 ceramic models implement the constitutive model in Abaqus by calculating stresses, evolving damage, updating stiffness, and passing results to Abaqus at each increment.
To implement Johnson-Holmquist damage models for brittle ceramics in Abaqus, we suggest two solutions:
- Using the built-in material model in Abaqus
You have three choices for this. The JH-1, JH-2, and JHB models. All three models can be used in Abaqus without the need to write a VUMAT subroutine by defining a series of parameters in the Abaqus input file (*.inp). But if you want to develop your own VUMAT JHB and JH-2 ceramic models, the second solution is for you.
- Writing a VUMAT subroutine
You do not need to write a subroutine! We have already done this for you. By preparing this package, you also receive a VUMAT subroutine Fortran file that includes the JH-2 ceramic model and you can easily use it with the linking of Abaqus software with Visual Studio and the Fortran compiler. Also, if you know a little more, you can develop your proposed model by making changes in the formulation of JH-2. In this way, you save a lot of coding and research time.
What you’ll learn
- What are the Johnson, Holmquist, and Beissel (JHB) And Johnson-Holmquist (JH-2) ceramic models?
- What are the VUMAT JHB and JH-2 ceramic models’ damage parameters?
- Where and for what materials, VUMAT JHB and JH-2 ceramic models can be used?
- How to define and use Abaqus VUMAT JHB and JH-2 ceramic models in Abaqus?
- What is Hugoniot elastic limit in VUMAT JHB and JH-2 ceramic models?
- Set up Abaqus CAE for built-in VUMAT JHB and JH-2 ceramic models subroutine
- Define the damage behavior of brittle materials in Abaqus
- Define field variables for the VUMAT JHB and JH-2 ceramic models in Abaqus
- How to determine the required VUMAT JHB and JH-2 ceramic models parameters from physical tests
- How to define the VUMAT JHB and JH-2 ceramic models in an Abaqus input file
- Run Abaqus with built-in VUMAT JHB and JH-2 ceramic models
- Perform single-element analysis with/without VUMAT subroutine
- Simulate high-velocity impact in Abaqus
- Visualize the damage/stress/displacement/strain results
Overview of VUMAT JHB and JH-2 Ceramic Model Course
- Introduction to VUMAT JHB & JH-2 ceramic model
- Abaqus VUMAT JHB & JH-2 ceramic model parameters
- Modeling ceramic failure with the JHB and JH-2 continuum damage mechanics models
- Implementing Johnson-Holmquist damage models for brittle ceramics in Abaqus
- Examples & workshops
- Additional modeling issues
Examples & Workshops
- Workshop 1: JH-2 single-element tests
- Workshop 2: JHB single-element tests
- Workshop 3: High-velocity impact of a ceramic target (JHB built-in material model)
- Workshop 4: High-velocity impact of a ceramic target (JH-2 built-in material model)
- Workshop 5: High-velocity impact of a ceramic target (Drucker-Prager material model)
- Workshop 6: High-velocity impact of a ceramic target (JH-2 VUMAT subroutine)
Here you can find an example in Abaqus documentation
Who this course is for
- Civil and mechanical engineers who need to perform high-velocity impact analysis
- Advanced students, Ph.D. students, or researchers for their Abaqus FEA projects
- Any Abaqus Application Engineer who is involved with various simulation projects on a daily basis
- Design and research and development (R&D) offices of military and parts manufacturing companies
- Abaqus FEA simulation consultancies
What you’ll gain
- You will be able to conduct high-velocity impact analysis by Abaqus
- You will be able to develop your own Abaqus VUMAT user subroutine of the Johnson-Holmquist damage model
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