Stress-based forming limit diagrams (SFLD) considering strain rate effect and ductile damage phenomenon
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Farid Hosseini Mansoub
Abstract
Although drawing forming limit diagrams is a suitable tool for analyzing material formability, it can only be used when loading is proportional. In other words, when the ratio between main strains stays unaffected during the formation process. Since forming limit diagrams are strictly dependent on strain path, the significance of the limit increases. As the path of the strain changes in a formation process, the forming limit diagrams and therefore the designer's decision changes as well. In order to eliminate this issue, stress-based forming limit diagrams (SFLD) which are independent from the strain path are gaining attention. This paper gives an efficient method to determine the SFLDs and can accurately predict the location for the onset of failure, including strain rate calculations. Furthermore, introducing a damage function based on a simple continuum damage mechanics is dependent on the stress state (Triaxiality and Lode parameters). As a characterization parameter, elastic modulus is eventually chosen to measure the ductile damage in the process of plastic deformation of the material. Furthermore, a UMAT subroutine is developed in finite element simulation by ABAQUS according to original formulations, in order to analyze and link the related essential models. To examine the accuracy of the results from the present simulative study and compare with the experimental results, applicability is considered. Forming limit tests are also performed for St 13 sheets measuring the FLD and then transforming to SFLD. It should be noted that the rule of these simulative SFLDs is in good agreement with the experimental points. Results revealed that the level of the stress-based forming limit diagram for the material St 13 increases with enhancing the strain rate.
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© 2020, Carl Hanser Verlag, München
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Articles in the same Issue
- Contents
- Contents
- Original Contributions
- Solidification processes of as-cast alloys and phase equilibria at 1 300 °C of the Nb–Si–V ternary system
- Compressive properties and energy absorption response of cBN added Al composite foams
- Deformation characteristics of Cu-30 % Zn alloy subjected to dynamic equal channel angular pressing (DECAP)
- Stress-based forming limit diagrams (SFLD) considering strain rate effect and ductile damage phenomenon
- Processing and properties of ultrafine-grained Mg-3Al-1Zn magnesium alloy microtubes fabricated via isothermal hot microforming of SPD processed precursors
- The effect of in-situ formed TiB2 particles on microstructural and mechanical properties of laser melted copper alloy
- Nanoindentation study on Al86Ni8Y6 glassy alloy synthesized via mechanical alloying and spark plasma sintering
- Synthesis of nanosized cadmium ferrite and assaying its magnetic and dielectric properties by analytical and physical techniques
- BN nanosheet modified SnO materials for enhancing photocatalytic properties
- Preparation of salt microparticles via the anti-solvent recrystallization process
- Short Communications
- CVD grown graphene on commercial and electroplated Cu substrates: Raman spectroscopy analysis
- DGM News
- DGM News
