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Material Failure Criteria for FE-solvers Users
Rating: 4.8 out of 5(44 ratings)
1,798 students

Material Failure Criteria for FE-solvers Users

Theories of elastic failure-Forming limit diagram-Failure criteria in simulation software
Created byAmr Shaaban
Last updated 6/2021
English
English [Auto],

What you'll learn

  • Theories of elastic failure for design problems
  • Forming limit diagram
  • Evaluation of metal forming process based on FLD
  • Nakajima test and ISO12004
  • Formability chart in FE-solvers

Course content

1 section • 6 lectures • 1h 34m total length

  • Introduction17:00

    Explore material failure criteria for FE-solvers and the elastic versus plastic theories. Learn how yield, safety factors, and equivalent plastic strain inform metal forming simulations.

  • Theories of Elastic Failure15:16

    Explore the Mohr circle and principal stresses to compare elastic failure criteria—Tresca, von Mises, and maximum distortion energy—and apply them to combined stress states and forming limit concepts.

  • Forming Limit Diagram-Theory15:59

    Define the forming limit diagram as the plastic failure criterion for metal forming, mapping stress states to major and minor strains to predict yielding and failure.

  • How to obtain the FLD for a specific material?14:59

    Explore how to obtain the forming limit curve using Nagashima tests and various blank geometries to predict stamping failures, including tension, shear, thinning, and crack risk in sheet metal.

  • Nakajima Test-Data Interpretetion16:58

    Interpret Nakajima test data to construct the forming limit curve for an alloy, using digital image correlation to extract sigma major and sigma minor from crack propagation.

  • Application-Testing a Deep Drawing Process based on FLD in Lsdyna14:23

    Explore forming limit curves for deep drawing in LS-DYNA, converting Nakajima data into sigma major/minor plots to assess necking, wrinkles, and cracks with a margin of safety.

Requirements

  • It's Suggested to be aware of simulation using FE-solvers

Description

This course introduces a comprehensive discussion for material failure criteria
The course consists of six lectures.
The course is thought to be helpful for those who uses FE-solvers for the simulation of various metal forming processes.

The theoretical background is combined with practical implementation by the end of the course.
[Lec1 and Lec2]: Stress strain curve, true and engineering data, various types of stresses, and theories of elastic failure.
[Lec3 to Lec6]: Forming limit diagram, major and minor strain, Nakajima test, ISO12004, data interpretation, Application on deep drawing process simulation on Lsdyna.

Through those lectures, the failure criteria suitable for each case is introduced.

As one of the targets of this course is to qualify the attendees to be professional users for simulation software, the last lecture focuses on how the forming limit diagram can be used to evaluate a deep drawing process simulated on one of the famous FE-solvers which is Lsdyna. Other graphs such as formability and triaxility are introduced.

Useful material is attached with each lecture for students to help them to cope with the recording.
The course in general is integrated to our course in Udemy titles "Mechanical design a comprehensive course" and also "Ansys explicit dynamics course", which is prepared to be in English soon.

Who this course is for:

  • Mechanical design students
  • Designers of metal forming processes
  • Researchers in the fied of modeling and simulation of metal forming processes

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