Determination of the rigid rotation plastic hinge point in SENB specimens in different strain hardening steels

Khor, WeeLiam; Moore, Philippa; Pisarski, Henryk; Brown, Chris

doi:10.1088/1742-6596/1106/1/012015

Cited by 2 publications

(12 citation statements)

References 3 publications

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“…A total of 50 quarter Bx2B single‐edge notched bend (SENB) specimen models were generated to investigate CTOD for a range of a 0 / W and σ ys / σ uts using ABAQUS v6.14. A blunted crack tip of 0.03‐mm radius was used in the models, which allows better plastic deformation at the crack tip region . The modelling technique used in this paper was shown to give good prediction of CTOD, further described in previous published works .…”

Section: Methodsmentioning

confidence: 79%

“…To obtain a better resolution of the r p sh distribution due to the effects of strain hardening, data were extracted from the FE models and processed using Equation . CTOD was extracted for 0.2 mm < δ FE < 1.0 mm to minimise the influence of the elastic CTOD and large deformation . Figure shows r p sh for the increasing FE CTOD, δ FE .…”

Section: Resultsmentioning

confidence: 99%

“…As σ ys / σ uts move towards 1, r p sh for all a 0 / W tends to converge and give a similar value. Models from a 0 / W = 0.5 were validated experimentally and thus were used as the baseline for the fitting. A linear line was fitted to the r p sh data from their respective a 0 / W , while passing through point σ ys / σ uts = 0.98, r p sh = 0.51.…”

Section: Resultsmentioning

confidence: 99%

“…The concept of rigid rotational point has been successfully implemented for the determination of CTOD with various degree of accuracy . To investigate the rotational factor, r p for SEN(B) specimens, an opened crack was investigated geometrically based on the similar triangles concept (Figure ).…”

Section: Methodsmentioning

confidence: 99%

“…To account for the effects of crack tip blunting due to strain hardening, r p was extracted based on the intersection line extrapolated from the CMOD and CTOD to the symmetry line (Figure ). This r p accounts for crack tip blunting and should give lower r p than that obtained from crack face angles, thereafter described as r p sh …”

Section: Methodsmentioning

confidence: 99%

See 4 more Smart Citations

A CTOD equation based on the rigid rotational factor with the consideration of crack tip blunting due to strain hardening for SEN(B)

Khor

2019

Fatigue Fract Eng Mat Struct

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Crack tip opening displacement (CTOD) from national and international standards was shown to give different values. This paper investigates the feasibility of CTOD determined based on the concept of rigid rotational factor in single‐edge notched bend (SENB) specimens. Based on validated modelling methods, finite element (FE) models were simulated for crack ratios 0.3 ≤ a0/W ≤ 0.7 and yield‐to‐tensile ratio 0.44 ≤ σys/σuts ≤ 0.98. This covers cases of shallow to deeply cracked specimens and a wide range of strain hardening properties. CTOD obtained from the FE models was used as the basis of a newly implemented strain hardening corrected rotational factor, which considers the effects of crack tip blunting due to strain hardening, rp sh. An improved equation considering strain hardening was implemented based on the rp sh. The equation gives accurate estimation of CTOD from the FE models compared with the equation from BS 7448‐1, ASTM E1820, and WES 1180.

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Section: Methodsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

A CTOD equation based on the rigid rotational factor with the consideration of crack tip blunting due to strain hardening for SEN(B)

Khor

2019

Fatigue Fract Eng Mat Struct

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Finite element analysis on grey cast iron assets: a case study on penstocks in the wastewater system

Khor

Farrow

Mulheron

et al. 2022

Infrastructure Asset Management

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Penstocks have been used in the water industry for flow control since the Victorian expansion and consolidation of clean and waste water networks. However, the Victorians were the first to use grey cast iron (GCI) castings to manufacture large scale penstocks. Most of these ageing assets are still in operation, however engineering assessments are necessary to determine a structure’s fitness-for-service. Even today, penstocks in the sewer system tend to be made from GCI, due to ease of manufacturing, resistance to corrosion and cost. One characteristic property of grey cast iron is the graphite flake structure in the material, contributing to its low toughness, inconsistency in material strength and brittle behaviour, despite exhibiting slight hardening properties. Finite element analysis (FEA), is a numerical method which allows the analysis of complex structures by splitting it into finite parts and solving them with a computer processor. Despite the versatility of FEA, appropriate considerations and assumptions are necessary due to the difficulty to obtain data from inspection and unique material behaviour of GCI. The article shows concerns for an analysis of GCI penstocks using FEA, which extends into the application of fracture mechanics approaches for defect assessments.

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Determination of the rigid rotation plastic hinge point in SENB specimens in different strain hardening steels

Cited by 2 publications

References 3 publications

A CTOD equation based on the rigid rotational factor with the consideration of crack tip blunting due to strain hardening for SEN(B)

A CTOD equation based on the rigid rotational factor with the consideration of crack tip blunting due to strain hardening for SEN(B)

Finite element analysis on grey cast iron assets: a case study on penstocks in the wastewater system

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