Identification of the parameters of a non-linear continuum damage mechanics model for ductile failure in metals

Bonora, Nicola; Gentile, Domenico; Pirondi, A.

doi:10.1243/0309324042379356

Cited by 41 publications

(11 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The calibration of damage parameters based on tensile tests was performed since a wellestablished procedure is available in this case (Bernauer and Brocks (2002), Bonora et al (2004)). The underlying assumption is that failure under cyclic plastic loading is a result of void nucleation, growth and coalescence process, too, as it may occur for very high plastic strain amplitudes and/or triaxialities.…”

Section: Notation a Ijmentioning

confidence: 99%

“…The elastic modulus was evaluated at the minimum section by means of a strain gauge. Further details on the experimental procedure can be found in Bonora et al (2004).…”

Section: Tensile Tests On Flat Rectangular Hourglass Specimens (Frhg)mentioning

confidence: 99%

“…A value of 1.5 of the critical strain ε cr in the damage model is therefore justified since failure in tensile tests on RB occurred after a prominent necking phase, where a higher triaxiality and hence damage rate, develops. Further details on parameters calibration can be found in Bonora et al (2004). The minimum requirement for model and parameter validation is that failure under tensile loading of different specimens can be correctly predicted.…”

Section: Pb Model Parametersmentioning

confidence: 99%

See 2 more Smart Citations

Simulation of failure under cyclic plastic loading by damage models

Pirondi

Bonora

Steglich

et al. 2006

International Journal of Plasticity

View full text Add to dashboard Cite

The purpose of this work is to simulate the evolution of ductile damage and failure involved by plastic strain reversals using damage models based on either Continuum Damage Mechanics (CDM) or porosity evolution. A low alloy steel for pressure vessels (20MnMoNi55) was chosen as reference material. The work includes both experimental and simulation phases. The experimental campaign involves different kinds of specimens and testing conditions. First, monotonic tensile tests have been performed in order to evaluate tensile and ductile damage behaviour. Then, the cyclic yielding behaviour has been characterized performing cyclic plasticity tests on cylindrical bars. Finally, cyclic loading tests in the plastic regime have been made on different Round Notched Bars (RNBs) to study the evolution of plastic deformation and damage under multiaxial stress conditions. The predictions of the different models were compared in terms of both, the specimens macroscopic response and local damage. Special emphasis was laid on predictions of the number of cycles prior to final failure and the crack initiation loci.

show abstract

Section: Notation a Ijmentioning

confidence: 99%

“…The elastic modulus was evaluated at the minimum section by means of a strain gauge. Further details on the experimental procedure can be found in Bonora et al (2004).…”

Section: Tensile Tests On Flat Rectangular Hourglass Specimens (Frhg)mentioning

confidence: 99%

Section: Pb Model Parametersmentioning

confidence: 99%

See 1 more Smart Citation

Simulation of failure under cyclic plastic loading by damage models

Pirondi

Bonora

Steglich

et al. 2006

International Journal of Plasticity

View full text Add to dashboard Cite

show abstract

“…The model requires four material parameters only. All of them have a physical meaning and can be determined according to the procedure given in [9]. The damage rate equation is given by dD dp…”

Section: Ductile Damage Modelingmentioning

confidence: 99%

Damage development in rod-on-rod impact test on 1100 pure aluminum

Iannitti¹,

Bonora²,

Bourne³

et al. 2017

AIP Conference Proceedings

View full text Add to dashboard Cite

Abstract. Stress triaxiality plays a major role in the nucleation and growth of ductile damage in metals and alloys. Although, the mechanisms responsible for ductile failure are the same at low and high strain rate, in impact dynamics, in addition to time resolved stress triaxiality and plastic strain accumulation, pressure also contributes to establish the condition for ductile failure to occur. In this work, ductile damage development in 1100 commercially pure aluminum was investigated by means of rod-on-rod (ROR) impact tests. Based on numerical simulations, using a continuum damage mechanics (CDM) model that accounts for the role of pressure on damage parameters and stochastic variability of such parameters, the impact velocity for no damage, incipient and fully developed damage were estimated. ROR tests at selected velocities were performed and damage distribution and extent were investigated by sectioning of soft recovered samples. Comparison between numerical simulations and experimental results is presented and discussed.

show abstract

“…Damage parameters for a given material can experimentally be measured in terms of progressive elastic modulus reduction as a function of strain in an hourglass-shaped specimen loaded in tension [21]. The ratio of the hydrostatic pressure to von Mises equivalent stress is referred to as triaxiality factor, TF.…”

Section: Continuum Damage Mechanics Model For Ductile Materialsmentioning

confidence: 99%