Experimental analysis of strain path dependent ductile damage mechanics and forming limits

Tasan, CC Cem; Hoefnagels, Jpm Johan; Horn, ten Chlj; Geers, Mgd Marc

doi:10.1016/j.mechmat.2009.08.003

Cited by 100 publications

(37 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Interestingly, the first three observations are in agreement with those of Tasan et.al [46], where the total number of damage incidents was measured (only) at the point of necking and failure, for the commercial (parent) DP600 microstructure with the same chemical composition (note that no comparison with observation 4 could be made).…”

Section: Quantitative Damage Analysissupporting

confidence: 88%

“…This mechanism may be the underlying reason for the recent success of nano-grain dual-phase steels [9]. The diffuse deformation and resulting strain hardening in the ferrite grains adjacent to the voids may also explain earlier observations that for DP steels the classical mechanism of ductile failure through void initiation, growth, and coalescence only becomes relevant close to the moment of final failure, i.e., after global localization has set in [46].…”

Section: Microstructure Designmentioning

confidence: 75%

See 1 more Smart Citation

Retardation of plastic instability via damage-enabled microstrain delocalization

et al. 2015

View full text Add to dashboard Cite

Multi-phase microstructures with high mechanical contrast phases are prone to microscopic damage mechanisms. For ferrite-martensite dual-phase steel, for example, damage mechanisms such as martensite cracking or martensite-ferrite decohesion are activated with deformation, and discussed often in literature in relation to their detrimental role in triggering early failure in specific dualphase steel grades. However, both the micromechanical processes involved and their direct influence on the macroscopic behavior are quite complex, and a deeper understanding thereof requires systematic analyses. To this end, an experimental-theoretical approach is employed here, focusing on three model dual-phase steel microstructures each deformed in three different strain paths. The micromechanical role of the observed damage mechanisms is investigated in detail by in-situ scanning electron microscopy tests, quantitative damage analyses, and finite element simulations. The comparative analysis reveals the unforeseen conclusion that damage nucleation may have a beneficial mechanical effect in ideally designed dual-phase steel microstructures (with effective crack-arrest mechanisms) through microscopic strain delocalization.

show abstract

Section: Quantitative Damage Analysissupporting

confidence: 88%

Section: Microstructure Designmentioning

confidence: 75%

Retardation of plastic instability via damage-enabled microstrain delocalization

et al. 2015

View full text Add to dashboard Cite

show abstract

“…bulge pressure tests [6,7], hemi-spherical punch (i.e. Nakazima) tests [2,8], cruciform tests [9][10][11], flat punch (i.e. Marciniak) tests [12,13], multiaxial compression tests [14,15], electromagnetic forming tests [16,17] (Fig.…”

Section: Critical Comparison Of Potential Testing Methodologies For Mmentioning

confidence: 99%

“…Although the literature has seen an extensive amount of research on both aspects separately, the connection between them is only rarely established, e.g., to link the strain path dependent forming limits to the underlying microstructural deformation mechanisms [2,3]. The major cause of this gap in the literature is the limitations of the commonly available experimental methodologies, i.e.…”

Section: Introductionmentioning

confidence: 99%

Multi-Axial Deformation Setup for Microscopic Testing of Sheet Metal to Fracture

et al. 2011

View full text Add to dashboard Cite

While the industrial interest in sheet metal with improved specific-properties led to the design of new alloys with complex microstructures, predicting their safe forming limits and understanding their microstructural deformation mechanisms remain as significant challenges largely due to the inadequacy of the existing experimental tools. The investigation of the strain-path dependent failure mechanisms requires miniaturized testing equipment, which can be placed in a scanning electron microscope for in situ experiments. So far, such tests could only be carried out for a single strain path (uniaxial tension). In this work, in order to fill this gap, a miniaturized Marciniak test setup is designed, built and tested. With this setup real-time, multi-axial tests of industrial sheet metal can be carried out to the point of fracture within a

show abstract

“…Unfortunately, in these studies the damage micro-mechanisms were studied from post-mortem fracture analysis [4], due to the absence of a miniaturized testing setup capable of deforming sheet metal up to failure in alternative strain paths (e.g. plane strain or biaxial tension).…”

mentioning

confidence: 99%

Miniature Marciniak Setup for in-situ SEM Observation of Damage Micro-mechanisms

Hoefnagels

Tasan

Dekkers

et al. 2010

EPJ Web of Conferences

Self Cite

View full text Add to dashboard Cite

The industrial and scientific interest for ductile damage and fracture has significantly increased in the last decades due to the popularity of new advanced materials, such as high strength steels and nanostructured metals [1]. To allow for detailed investigation of micro-events such as the damage micro-mechanisms, the deformation needs to be studied in real time with in-situ scanning electron microscopy, allowing for digital image correlation (DIC) of the high resolution images for local strain mapping [2], see e.g. Figure 1. These studies, however, were limited to deformation under uniaxial tension due to the constraints of in-situ SEM testing.At the same time, parallel research efforts have focused on elucidating the effect of the followed strain path on the ductile deformation micro-mechanisms, and its consequence for the resulting macroscopic forming and fracture limits in sheet metal [3]. Unfortunately, in these studies the damage micro-mechanisms were studied from post-mortem fracture analysis [4], due to the absence of a miniaturized testing setup capable of deforming sheet metal up to failure in alternative strain paths (e.g. plane strain or biaxial tension).

show abstract

Experimental analysis of strain path dependent ductile damage mechanics and forming limits

Cited by 100 publications

References 26 publications

Retardation of plastic instability via damage-enabled microstrain delocalization

Retardation of plastic instability via damage-enabled microstrain delocalization

Multi-Axial Deformation Setup for Microscopic Testing of Sheet Metal to Fracture

Miniature Marciniak Setup for in-situ SEM Observation of Damage Micro-mechanisms

Contact Info

Product

Resources

About