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Numerical analysis of damage during hot forming

Szyndler Joanna, Muhammad Imran Muhammad, Muhammad Junaid Afzal Muhammad Junaid, Bambach Markus

Computer Methods in Materials Science

2018

Vol. 18, No. 3

107--114

The main aim of the presented research is the analysis of damage evolution in 16MnCrS5 steel during hot forming based on results obtained from finite element modelling. Particular attention is put on the interaction between dynamic recrystallization (DRX) and damage initiation at the matrix-inclusion interface. Moreover, a modified Gurson-Tvergaard- Needleman (GTN) model is proposed with the nucleation criterion taken from an extended Horstemeyer model, which predicts damage nucleation based on material softening due to the DRX and stress state in the material.

Voids Nucleation at Inclusions of Various Shapes in Front of the Crack in Plane Strain

Neimitz A., Janus U.

Archives of Metallurgy and Materials

2016

Vol. 61, iss. 3

1587--1592

An analysis is presented of the stress field in and around inclusions of various shapes. Results were obtained by the finite element method. Inclusions were located within elementary cells located at the centre of the specimen next to the crack front. The influence of an in-plane constraint on the stress distribution was tested.

Analysis of Stress and Strain Fields in and around Inclusions of Various Shapes in a Cylindrical Specimen Loaded in Tension

Neimitz A., Janus U.

Archives of Metallurgy and Materials

2016

Vol. 61, iss. 2A

569--576

A numerical analysis is performed of the stress field in and around inclusions of various shapes. Inclusions both stiffer and more compliant than the metal matrix are analysed. The critical stresses required for inclusion fracture are estimated after observation of cavities and inclusions by scanning electron microscopy. Real inclusions were observed after performing uniaxial loading to different amounts of overall strain. The material tested was Hardox-400 steel.