Notch fracture toughness of high-strength Al alloys

Vratnica, M.; Pluvinage, G.; Jodin, P.; Cvijović, Z.; Rakin, Marko; Burzić, Zijah; Geric, K.

doi:10.1016/j.matdes.2012.07.031

Cited by 22 publications

(19 citation statements)

References 16 publications

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“…However, CTOD i values measured on PRNB specimens are slightly higher than CTOD i values measured on SENB specimens which are fatigue pre‐cracked. Figure shows that both measurements provide higher values of CTOD i for notched specimens in relation to the fatigue pre‐cracked specimens, as it can be seen in literature too …”

Section: Discussionsupporting

confidence: 80%

Correlation of Pipe Ring Notched Bend (PRNB) specimen and Single Edge Notch Bend (SENB) specimen in determination of fracture toughness of pipe material

Damjanović

Kozak

Matvienko

et al. 2017

Fatigue Fract Eng Mat Struct

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It is well known that pipes or tubes due to their geometry are not suitable for producing standard specimens for fracture toughness testing (e. g. Single Edge Notched Bend (SENB) specimens or Compact Tension specimens. This is especially evident in thin walled pipes or tubes. We propose a new type of specimen, called Pipe Ring Notched Bend (PRNB) specimen, which is ideal for pipes or tubes due to its ring geometry. In the recent years, the authors have made a lot of research on this type of specimen, but cut out from a plate, not from pipes, where some imperfections in the geometry, material, residual stresses, etc. are present. Within this paper, two PRNB specimens (designations PRNB1 and PRNB2) are cut out from pipe which is used in boilers and made from 16Mo3 steel. From the same pipe, four SENB specimens (designations SENB1, SENB2, SENB3 and SENB4) are also made in order to compare the fracture behaviour of standard SENB and newly proposed PRNB specimens.

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Section: Discussionsupporting

confidence: 80%

Correlation of Pipe Ring Notched Bend (PRNB) specimen and Single Edge Notch Bend (SENB) specimen in determination of fracture toughness of pipe material

Damjanović

Kozak

Matvienko

et al. 2017

Fatigue Fract Eng Mat Struct

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“…Generally, this property is measured with stress state near the crack front as plane strain and confined plasticity. If these conditions are valid, the K1C value represents a lower limiting value of fracture toughness, which leads to a very conservative design and estimation of failure stress and critical defect size for a material in service under similar stress state conditions [21], The planestrain fracture toughness tests were performed on compact tension specimens taken from the thick plates in the T-L orientation with a size (in mm) of 48x40x10 (LxWxB) in accordance with the ASTM standard E-399 [22]. Tests were carried out on an MTS 810 servo hydraulic machine.…”

Section: Tensile and Fracture Toughness Testsmentioning

confidence: 99%

Study on strength and fracture toughness of Al-Zn-Mg-Cu-Ti(-Sn) alloys

Yan

Chen

Liu

et al. 2015

J min metall B Metall

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The strength and fracture toughness o f Al-Zn-M g-Cu-Ti(-Sn) alloys were investigated by performing tensile and plane strain fracture toughness (KIC) tests. Detailed observations with optical, scanning electron and transmission electron microscopy were conducted to analyze microstructure andfracture surfaces o f the alloys. The results revealed that addition o f Sn refined the solution-aging grain size o f matrix and reduced coarsening rate o f precipitate during aging. Narrower precipitation free zones and more discontinuous distribution o f grain boundary precipitates were observed to be displayed in the Sn-containing alloy. Small size second phase particles M g fin were observed to form in the Sn-containing alloy and distribute in the fin e dimples offracture surface. These features o f microstructure were believed to impart higher strength and fracture toughness o f the Sn-containing alloy on overaging.

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“…Due to the close values of the yield and tensile strengths of such materials, they have valid K-based fracture toughness (KIc or Kc) values and hence, the fracture prediction of cracked and notched components made of aluminum alloys are normally performed by means of the failure criteria in the context of the LEFM. Recently, two research papers have been published in which the mode I notch fracture toughness (NFT) of Al 7075-T651 (Madrazo et al, 2012) and Al-Zn-Mg-Cu alloy (Vratnicaa et al, 2013) have been predicted by means of the brittle fracture criteria which are well-known in the LENFM context. While the predictions reported by Madrazo et al (2012) and Vratnicaa et al (2013) have been successful, it seems that the use of the LENFM criteria for such predictions is questionable because of existing significant plastic deformations around the notch at crack initiation instance.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, two research papers have been published in which the mode I notch fracture toughness (NFT) of Al 7075-T651 (Madrazo et al, 2012) and Al-Zn-Mg-Cu alloy (Vratnicaa et al, 2013) have been predicted by means of the brittle fracture criteria which are well-known in the LENFM context. While the predictions reported by Madrazo et al (2012) and Vratnicaa et al (2013) have been successful, it seems that the use of the LENFM criteria for such predictions is questionable because of existing significant plastic deformations around the notch at crack initiation instance. Similar restriction in failure prediction of notched ductile steel components by TCD was also explained above (Susmel & Taylor, 2008a;Torabi, 2012).…”

Section: Introductionmentioning

confidence: 99%

Large plasticity induced crack initiation from U-notches in thin aluminum sheets under mixed mode loadin

Torabi¹,

Hosseini²

2017

10.5267/j.esm

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Ductile failure is investigated experimentally and theoretically in U-notched Al 7075-T6 thin sheets under mixed mode I/II loading. First, several U-notched rectangular sheets are subjected to mixed mode I/II failure tests and the load-carrying capacity of the sheets are experimentally recorded. Then, the Equivalent Material Concept (EMC) is employed in conjunction with the U-notch maximum tangential stress (UMTS) and U-notch mean stress (UMS) criteria to theoretically estimate the load-carrying capacity of the U-notched Al 7075-T6 sheets. It is shown that the experimental failure loads are well predicted by means of both the UMTS-EMC and UMS-EMC criteria. Moreover, the experimental observations and the elastic-plastic finite element analyses indicate that the U-notched aluminum sheets fail by the large-scale yielding (LSY) regime.

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Notch fracture toughness of high-strength Al alloys

Cited by 22 publications

References 16 publications

Correlation of Pipe Ring Notched Bend (PRNB) specimen and Single Edge Notch Bend (SENB) specimen in determination of fracture toughness of pipe material

Correlation of Pipe Ring Notched Bend (PRNB) specimen and Single Edge Notch Bend (SENB) specimen in determination of fracture toughness of pipe material

Study on strength and fracture toughness of Al-Zn-Mg-Cu-Ti(-Sn) alloys

Large plasticity induced crack initiation from U-notches in thin aluminum sheets under mixed mode loadin

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