Practical Applicability and Limitations of the Elastic Modulus Degradation Technique for Damage Measurements in Ductile Metals

Bonora, Nicola; Ruggiero, Andrew; Gentile, Domenico; Meo, S. De

doi:10.1111/j.1475-1305.2009.00678.x

Cited by 46 publications

(30 citation statements)

References 34 publications

(38 reference statements)

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“…A qualitative comparison between the areas at fracture and the corresponding to numerical modeling testifies the robustness of numerical model. As demonstrated in this modeling, the failure is expected to initiate in the center of the minimum section in the specimen [34,35]. Fig.…”

Section: Necking and Localization Of Deformationmentioning

confidence: 74%

Failure analysis based on microvoid growth for sheet metal during uniaxial and biaxial tensile tests

2013

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. Failure analysis based on microvoid growth for sheet metal during uniaxial and biaxial tensile tests. Materials and Design, Elsevier, 2013, vol. 49, pp. 638-646. <10.1016/j.matdes.2013 OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. a b s t r a c tThe aim of the presented investigations is to perform an analysis of fracture and instability during simple and complex load testing by addressing the influence of ductile damage evolution in necking processes. In this context, an improved experimental methodology was developed and successfully used to evaluate localization of deformation during uniaxial and biaxial tensile tests. The biaxial tensile tests are carried out using cruciform specimen loaded using a biaxial testing machine. In this experimental investigation, Stereo-Image Correlation technique has is used to produce the heterogeneous deformations map within the specimen surface. Scanning electron microscope is used to evaluate the fracture mechanism and the micro-voids growth. A finite element model of uniaxial and biaxial tensile tests are developed, where a ductile damage model Gurson-Tvergaard-Needleman (GTN) is used to describe material deformation involving damage evolution. Comparison between the experimental and the simulation results show the accuracy of the finite element model to predict the instability phenomenon. The advanced measurement techniques contribute to understand better the ductile fracture mechanism.

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Section: Necking and Localization Of Deformationmentioning

confidence: 74%

Failure analysis based on microvoid growth for sheet metal during uniaxial and biaxial tensile tests

2013

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“…As can be seen, the general trend of the two curves of the predictions of these models is the same and the maximum difference between the value of stress in a given strain is 8.5%. The authors believe that these results can be improved using an optimization procedure or more refined methods [34]. However, the results obtained for this titanium alloy with the linear CDM framework are encouraging.…”

Section: Numerical Simulations For Application Of the Damage Modelsmentioning

confidence: 87%

Identification of damage parameters for Ti‐6Al‐4V titanium alloy using continuum damage mechanics

Allahverdizadeh¹,

Manes

Giglio

2012

Materialwissenschaft Werkst

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Modelling ductile damage is one of the most important applications of continuum damage mechanics (CDM) models. Scientists have previously tried to identify the damage parameters and have calibrated the failure behaviour of different materials using CDM models. However, more comprehensive studies are still needed to investigate the capabilities of CDM models for different materials. It is possible to extend the methodology to titanium alloys that are, currently, an optimal solution for highly stressed mechanical components. Therefore Lemaitre's CDM model parameters for ti-6Al-4V titanium alloy have been identified and reported in this work. A series of experimental tests have been carried out to identify the CDM model's parameters by the method of degradation of elastic modulus. A subroutine has been written in ABA-QUS to numerically simulate the behaviour of the simple specimen using Lemaitre's model. Keywords: Continuum damage mechanics / Ti-6Al-4V titanium alloy / ductile damage / numerical simulation / Die Modellierung duktiler Schädigung ist eine der wichtigsten Anwendungen der Kontinuums-Schädigungsmechanik (CDM). Forscher haben versucht die Schädigungsparameter verschiedener Materialien durch CDM zu identifizieren und somit die Versagensverhalten zu kalibrieren. Um die Fähigkeit von CDM in verschiedenen Materialien zu untersuchen, sind jedoch umfassende Studien erförderlich. Es ist möglich, diese Methode auch auf Titanlegierungen zu erstrecken, die sich heutzutage als eine optimale Lösung für anspruchsvolle mechanische Komponenten anbieten. Deshalb werden in dieser Arbeit auch die Lemaitre CDM-Parameter identifiziert und präsentiert. Um die CDM-Parameter (durch die Bestimmung der Abnahme des Elastizitätmodul) zu identifizieren, wurden eine Reihe von experimentellen Untersuchungen durchgeführt. Um das Verhalten durch ein einfaches Modell (Lemaitre) zu simulieren, wurde eine Unterprogramm in Abaqus geschrieben.

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“…The critical damage defines the maximum reduction of the elastic modulus and the released damage strain energy. For several classes of metals and alloys this value is usually less than 0.1, [26]. The remaining damage parameters can be identified by means of experiments and finite element simulation.…”

Section: Damage Model Parameters Identificationmentioning

confidence: 99%

Strain capacity assessment of API X65 steel using damage mechanics

Testa

Bonora

Gentile

et al. 2017

Frattura Ed Integrità Strutturale

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International audienceStrain-based design for offshore pipeline requires a considerable experimental work aimed to determine the material fracture toughness and the effective strain capacity of pipe and welds. Continuum damage mechanics can be used to limit the experimental effort and to perform most of the assessment analysis and evaluation in a simulation environment. In this work, the possibility to predict accurately fracture resistance of X65 steel using a CDM model proposed by the authors, is shown. The procedure for material and damage model parameters identification is presented. Damage model predictive capability was demonstrated predicting ductile crack growth in SENB and SENT fracture specimens

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Practical Applicability and Limitations of the Elastic Modulus Degradation Technique for Damage Measurements in Ductile Metals

Cited by 46 publications

References 34 publications

Failure analysis based on microvoid growth for sheet metal during uniaxial and biaxial tensile tests

Failure analysis based on microvoid growth for sheet metal during uniaxial and biaxial tensile tests

Identification of damage parameters for Ti‐6Al‐4V titanium alloy using continuum damage mechanics

Strain capacity assessment of API X65 steel using damage mechanics

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