Online visioplasticity in forging processes

Matthias Schmidtchen, Anja Brethfeld, Gunter Lehmann

Technical University of Mining and Technology, Institute for Metal Forming, D- 09596 Freiberg,,Bernhard-von-Cotta-Straße 4, Germany.

DOI:

https://doi.org/10.7494/cmms.2007.4.0178

Abstract:

In the present paper a contactless optical method for visioplastic investigation of the displacement and strain field in hammer forging was discussed. Coupled with thermographic measurements the visioplastic investigations were compared with numerical computations using the commercial FE – code QForm. Experiments were performed using stocks of initial dimensions 160 x 160 x 500 mm. For visioplastic investigation the surface was marked with a stud grid. Problems in the correlation process using the commercial software VEDDAC arising from this surface preparation were solved and discussed. The displacement field was used as indicator for damage sensitive regions.

Cite as:

Schmidtchen, M., Brethfeld, A., & Lehmann, G. (2007). Online visioplasticity in forging processes. Computer Methods in Materials Science, 7(4), 416 – 421. https://doi.org/10.7494/cmms.2007.4.0178

Article (PDF):

Keywords:

Visioplasticity, Correlation of grey scales, Hammer forging, Numerical simulation, Crack initiation, Micro crack

References:

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Kieselstein, E., Dost, M., Noack, E., Michel, B., 1997, Characterisation of the Deformation Behaviour of Plastics by Means of Correlation Analysis of Digitized Grey Scale Patterns, Internat. Conference Technomer´97, Chemnitz.

Eberlein, L, Feldmann, P, Ry, Vo thi, 1992, Visioplastische Deformations- und Spannungsanalyse beim Fließpressen, Umformtechnik, 26 No.2, 113 – 118.