Parameter identification of a cohesive crack model by Kalman filter

Bolzon, Gabriella; Fedele, Roberto; Maier, G.

doi:10.1016/s0045-7825(02)00223-2

Cited by 83 publications

(43 citation statements)

References 22 publications

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“…Properly calibrated elastic − plastic constitutive models can interpret the response of the isotropic aluminium laminate and of the orthotropic paperboard composite, while the progressive fracture process can be simply simulated by non − linear spring elements, endowed with the piecewise linear traction − separation law schematized in Fig. 10(a), according to a cohesive − crack approach earlier exploited in different fracture mechanics contexts [12,13]. In this investigation, classical von Mises plasticity model with exponential hardening and saturation strength is assumed to describe the continuum behaviour of the investigated aluminium laminate.…”

Section: Simulation Of the Laboratory Testsmentioning

confidence: 99%

Characterization of fracture properties of thin aluminuminclusions embedded in anisotropic laminate composites

Bolzon¹,

Buljak²,

Zappa³

2011

Frattura Ed Integrità Strutturale

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ABSTRACT. The fracture properties of thin aluminum inclusions embedded in anisotropic paperboard composites, of interest for food and beverage packaging industry, can be determined by performing tensile tests on non-conventional heterogeneous specimens. The region of interest of the investigated material samples is monitored all along the experiment by digital image correlation techniques, which allow to recover qualitative and quantitative information about the metal deformation and about the evolution of the damaging processes leading to the detachment of the inclusion from the surrounding laminate composite. The interpretation of the laboratory results is supported by the numerical simulation of the tests. SOMMARIO.Le proprietà di frattura di inclusioni metalliche costituite da sottili stati di alluminio in compositi a base di carta, di interesse nel packaging alimentare, possono essere determinate mediante prove di trazione nonconvenzionali, condotte su campioni di materiale eterogeneo. La deformazione della regione di interesse nel corso della prova viene monitorata attraverso tecniche di correlazione d'immagini digitali che restituiscono informazioni quantitative, oltre che qualitative, sul fenomeno di progressivo distacco dell'inclusione metallica dal composito laminato che la circonda. L'interpretazione dei risultati sperimentali viene supportata dalla simulazione numerica delle prove di laboratorio.

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Section: Simulation Of the Laboratory Testsmentioning

confidence: 99%

Characterization of fracture properties of thin aluminuminclusions embedded in anisotropic laminate composites

Bolzon¹,

Buljak²,

Zappa³

2011

Frattura Ed Integrità Strutturale

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“…In these works, optimization procedures were employed, which involves the minimization of a chosen objective function expressed as the norm of the difference between the calculated and experimental data. Bolzon et al [57,58] have employed a general formulation of the softening law for inverse analysis in complementarity format and formulated the parameter identification problem as a mathematical programming problem. Other indirect methods include compliance technique employed by Hu and Mai [59] and general bilinear fit by Guinea et al [60].…”

Section: Brittle Materialmentioning

confidence: 99%

The Cohesive Zone Model for Fatigue Crack Growth

Liu

2013

Advances in Mechanical Engineering

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In the past decade, the cohesive zone model has been receiving increasing attention as a powerful tool for the simulation of fatigue crack growth. When applying cohesive zone model to fatigue fracture problem, three aspects should generally be taken into account, that is, unloading-reloading path, damage evolution during cyclic loading, and crack surface contact and friction behavior. This paper addresses the critical views of these aspects. Before that, the formulation of cohesive zone model and identification of cohesive zone model parameters and its numerical implementation have been reviewed.

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“…In this case, if substantially equivalent to overall analysis purposes, the non-linear description of the interface behaviour might be computationally more convenient than its piecewise linearization, which introduces two (in the considered 2D framework) additional auxiliary variables for each node at each breakpoint; compare e.g. (3) and (18) and see References [11,16]. The computational savings associated to the reduction of the total number of variables can compensate, to some degree, the increased number of iterations associated to non-linearity.…”

Section: Computational Remarksmentioning

confidence: 99%

“…Recursive calculations are also required by the identification procedures possibly employed to reduce and quantify the uncertainty on the model parameters, see e.g. References [10,11]. Costeffectiveness, besides reliability, constitutes a sought firm characteristic of the computational strategies to be envisaged, although the possible occurrence of severe snap-back instability and bifurcation(s) of the equilibrium path(s) [12,13] would imply the use of sophisticated modelling and software.…”

Section: Introductionmentioning

confidence: 99%

“…A common assumption of discrete cohesive-crack models is linear elasticity outside the loci of potential displacement discontinuity (joints or foundation interface), where non-linearity is confined, see e.g. References [4,5,[10][11][12][13][14][15]. More specifically: a piece-wise linear or exponential decay of tractions with increasing opening/ sliding displacements is assumed to describe coupled damaging mechanisms in the joint; the decay of uplift pressure as the opening displacement reduces to zero is also modelled by linear or exponential functions, while the bulk material is assumed to be impervious.…”

Section: Introductionmentioning

confidence: 99%

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Direct assessment of structural resistance against pressurized fracture

Bolzon

Cocchetti

2003

Num Anal Meth Geomechanics

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Dedicated to Prof. B.A. Schrefler on the occasion of his 60th anniversary SUMMARYThe determination of the load bearing capacity of hydraulic structures such as dams, reservoirs and retaining walls requires the consideration of mixed-mode fracture, possibly driven by the fluid pressure, in correspondence to artificial and natural joints (or cracks, in the latter case). A friction-cohesive softening interface model with coupled degradation of normal and tangential strength is introduced here to account for the essential features of the joint behaviour; its predictive capability is assessed through extensive calculations. Alternative numerical techniques resting on the discrete-crack approach are considered, focusing on simplified approaches for the direct appraisal of the structural resistance. Comparison is made with the results of evolutionary analyses, based on a priori piecewise linearization of the interface model and on 'exact integration'.

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Parameter identification of a cohesive crack model by Kalman filter

Cited by 83 publications

References 22 publications

Characterization of fracture properties of thin aluminuminclusions embedded in anisotropic laminate composites

Characterization of fracture properties of thin aluminuminclusions embedded in anisotropic laminate composites

The Cohesive Zone Model for Fatigue Crack Growth

Direct assessment of structural resistance against pressurized fracture

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