An empirical model for estimating fracture toughness using the DCDC geometry

Nielsen, Christian; Amirkhizi, Alireza V.; Nemat‐Nasser, Sia

doi:10.1007/s10704-014-9945-5

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…The energy consumption in the shear fracture region is expressed as:

U_{normalS} = U_{ten} \cdot V_{normalS},

where U ten is the energy density in the shear fracture region which is associated with tensile properties. Numerous efforts had related the fracture toughness of materials with their tensile properties. Here we assume that

U_{t e n} = β \cdot U_{k}

, where U k is the static toughness and β is a constant.…”

Section: Discussionmentioning

confidence: 99%

The Minimum Energy Density Criterion for the Competition between Shear and Flat Fracture

Zhang

et al. 2018

Adv Eng Mater

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It is generally recognized that the fracture toughness K IC of materials represents the crack resistance during fracture, i.e., the energy consumption. In this study, AISI 4340 steels with different strength are applied to systematically investigate the intrinsic mechanism of fracture toughness. It is found that the fracture surface morphologies of AISI 4340 steels change from quasi-cleavage fracture to dimple fracture with increasing the tempering temperature. While, the specimen size has almost no effect on the fracture mechanism of shear/flat fracture region, demonstrating that the fracture toughness depends on the proportion of shear and flat fracture region. Additionally, the shear lip width of the K IC specimen will increase to a constant value with enhancing the specimen thickness. Based on the energy balance principle, the maximum shear lip width can be obtained at the minimum fracture energy density of materials; consequently, there is an essential relationship between the shear fracture and fracture toughness, i.e., the minimum energy density criterion. The new finding, which provides a scaling law to well evaluate the plane strain fracture toughness of new materials with high toughness (e.g., nanostructured materials and metallic glasses), may broad the understandings on the fracture toughness.

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“…The energy consumption in the shear fracture region is expressed as:

U_{normalS} = U_{ten} \cdot V_{normalS},

U_{t e n} = β \cdot U_{k}

, where U k is the static toughness and β is a constant.…”

Section: Discussionmentioning

confidence: 99%

The Minimum Energy Density Criterion for the Competition between Shear and Flat Fracture

Zhang

et al. 2018

Adv Eng Mater

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“…Modelling and prediction methods for estimating fracture toughness and fatigue crack growth of aluminium alloy typically often use a variety of techniques, including empirical modelling [175] and simulations by using finite element analysis (FEA) [176,177]. These methods are needed to characterise the fracture behaviour of aluminium alloys and ensure their safe and effective use in various applications [178,179].…”

Section: Modelling and Predictive Approachesmentioning

confidence: 99%

Fracture Behaviour of Aluminium Alloys under Coastal Environmental Conditions: A Review

Alqahtani,

Starr,

Khan

2024

Metals

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Aluminium alloys have been integral to numerous engineering applications due to their favourable strength, weight, and corrosion resistance combination. However, the performance of these alloys in coastal environments is a critical concern, as the interplay between fracture toughness and fatigue crack growth rate under such conditions remains relatively unexplored. This comprehensive review addresses this research gap by analysing the intricate relationship between fatigue crack propagation, fracture toughness, and challenging coastal environmental conditions. In view of the increasing utilisation of aluminium alloys in coastal infrastructure and maritime industries, understanding their behaviour under the joint influences of cyclic loading and corrosive coastal atmospheres is imperative. The primary objective of this review is to synthesise the existing knowledge on the subject, identify research gaps, and propose directions for future investigations. The methodology involves an in-depth examination of peer-reviewed literature and experimental studies. The mechanisms driving fatigue crack initiation and propagation in aluminium alloys exposed to saltwater, humidity, and temperature variations are elucidated. Additionally, this review critically evaluates the impact of coastal conditions on fracture toughness, shedding light on the vulnerability of aluminium alloys to sudden fractures in such environments. The variability of fatigue crack growth rates and fracture toughness values across different aluminium alloy compositions and environmental exposures was discussed. Corrosion–fatigue interactions emerge as a key contributor to accelerated crack propagation, underscoring the need for comprehensive mitigation strategies. This review paper highlights the pressing need to understand the behaviour of aluminium alloys under coastal conditions comprehensively. By revealing the existing research gaps and presenting an integrated overview of the intricate mechanisms at play, this study aims to guide further research and engineering efforts towards enhancing the durability and safety of aluminium alloy components in coastal environments.

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