Fracture and damage mechanics modelling of thin-walled structures – An overview

Zerbst, Uwe; Heinimann, Markus; Donne, C. Dalle; Steglich, D.

doi:10.1016/j.engfracmech.2007.10.005

Cited by 85 publications

(59 citation statements)

References 111 publications

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“…up to a ligament yielding parameter -the ratio of the applied and the yield load -of 0.5. For ductile materials this parameter is usually above 0.8, thus the linear elastic and adjusted methods generally underestimate the fracture resistance [1]. Additionally, thin-walled structures generally do not meet the thickness requirements of standardized methods, and the empirical equations describing geometry dependent plane-stress fracture resistance cannot treat the effects of ligament yielding.…”

Section: Introductionmentioning

confidence: 99%

“…Due to their stress concentrating effect, micro-and nanoscale cracks could induce catastrophic failure well below the load bearing ability of the material. To avoid this, effective flaw assessment methods have to be developed [1]. For the analysis of thick, rather brittle materials standardized test methods are available (ASTM E1820-11, ISO 12135).…”

Section: Introductionmentioning

confidence: 99%

“…, L. Oláh 2 , P. Nagy ductile thin-walled geometries [1][2][3]. One of these is the essential work of fracture method (EWF), which became widespread as its test set-up is less complex and the restrictions of method are easier to fulfill compared to J-integral [4].…”

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confidence: 99%

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Towards the understanding of the molecular weight dependence of essential work of fracture in semi-crystalline polymers: A study on poly(ε-caprolactone)

Tuba¹,

Oláh²,

Nagy³

2014

Express Polym. Lett.

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Abstract. The plane-stress ductile fracture of poly(#-caprolactone) (PCL) has been investigated as a function of molecular weight and related crystalline structure. Because of the interacting effects in semi-crystalline polymers a separate study of a given structural parameter is rather challenging. Nevertheless, this polymer seems to be a good model material to study the effect of molecular weight on the essential work of fracture, as the interactions between the separate parameters, at room temperature, are negligible. The molecular characteristics of PCL were determined by size exclusion chromatography. To confirm the entangled molecular structure of studied polymers rheological measurements were performed. The crystalline morphology has been characterized by differential scanning calorimetry and wide angle X-ray diffraction. Quasi-static tensile tests and essential work of fracture tests were performed to study the mechanical behavior. Based on the experimental observations an empirical model has been proposed to outline the molecular weight and crystallinity dependence of the essential work of fracture in this semi-crystalline polymer.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Towards the understanding of the molecular weight dependence of essential work of fracture in semi-crystalline polymers: A study on poly(ε-caprolactone)

Tuba¹,

Oláh²,

Nagy³

2014

Express Polym. Lett.

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“…Click here to view linked References [9] and since car components are subjected to cyclic loading, the use fracture mechanics parameters to characterize the fatigue life in thin specimen of MASS seems more appropriate.…”

Section: *Manuscriptmentioning

confidence: 99%

Crack closure and fatigue crack growth near threshold of a metastable austenitic stainless steel

Martelo

Mateo

Chapetti

2015

International Journal of Fatigue

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In this paper R-ratio effects on fatigue crack growth near threshold region of a metastable austenitic stainless steel (MASS) in two different conditions, i.e. annealed and cold rolled, is investigated. The authors present two approaches to correlate FCGR data for R = 0.1, 0.3, 0.5, 0.7 and K-max = 23 MPa root m using a two-parameters approach (Delta K, K-max and alpha in Kujawski's model) and crack closure model (using Elber's K-op, and in Donald's ACRn2 approaches). The K-op and ACRn2 were experimentally measured on a single edge tension specimens. The K-op measurements were performed using a modified method and based on ASTM standards. While the two driving force approaches correlate data well in the Paris region, they fail to correlate them in the threshold region. However, this correlation can be improved in the threshold region when a different alpha value from the Paris region is used. The authors indicated that two different mechanisms operate; one in the Paris region and another in the near threshold. Hence, they proposed to combine the two-parameter and crack closure approaches where Delta K is replaced by Delta K-eff (estimated by a new method proposed in this paper), which is shown to correlate the FCGR data for different stress ratios for annealed steel. The correlation for cold rolled condition shows improvement with the new approach but is not as good as for the annealed one. The author further suggests to modify K-max in the two-parameter approach. (C) 2015 Elsevier Ltd. All rights reserved.Peer ReviewedPostprint (author’s final draft

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“…The ability of treating large amounts of ductile crack extension can in general be met by a number of assessment procedures and numerical models. It is common practice to treat ductile crack extension in the form of a crack extension resistance curve (R-curve), with crack extension expressed as a function of either of crack tip parameters like the stress intensity factor, K, the J integral, or crack tip opening displacement (CTOD) [3]. Among CTOD the 5 crack tip opening displacement method with a fixed gauge length at the crack tip is extensively validated for dealing with large amounts of crack extensions [4][5][6][7][8] and is now standardised by ASTM [9] and ISO [10].…”

Section: Introductionmentioning

confidence: 99%

Application of the cohesive model for predicting the residual strength of a large scale fuselage structure with a two-bay crack

Cornec

Schönfeld

Schwalbe

et al. 2009

Engineering Failure Analysis

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The residual strength of a curved and stiffened panel containing a two-bay crack was assessed using the cohesive model. This panel represents a section of a wide-body aeroplane fuselage. The tests were conducted at IMA GmbH Dresden in cooperation with Airbus Industries Germany. The structural panel was modelled using 3D finite elements and a layer of cohesive elements ahead of each crack tip allowing for 70 mm crack extension. Identification of the cohesive parameters was done on small laboratory test pieces. Special effort was made for the transfer of these parameters to the structure.Reasonably conservative predictions of the residual strength of the panel were achieved.The boundary conditions of the loading devices of the test rig are shown to have substantial influence on the predictions.

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Fracture and damage mechanics modelling of thin-walled structures – An overview

Cited by 85 publications

References 111 publications

Towards the understanding of the molecular weight dependence of essential work of fracture in semi-crystalline polymers: A study on poly(ε-caprolactone)

Towards the understanding of the molecular weight dependence of essential work of fracture in semi-crystalline polymers: A study on poly(ε-caprolactone)

Crack closure and fatigue crack growth near threshold of a metastable austenitic stainless steel

Application of the cohesive model for predicting the residual strength of a large scale fuselage structure with a two-bay crack

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