Modelling of fracture toughness data in the ductile to brittle transition temperature region by statistical analysis

Moskovic, R.

doi:10.1016/s0013-7944(01)00068-6

Cited by 22 publications

(24 citation statements)

References 8 publications

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“…It has been applied to data in the brittle to ductile fracture regime [3,4] from the cleavage regime to the onset of upper shelf behaviour 10 10 0.55 and beyond to fully ductile response. Application of the method results in data that can be directly used in initiation structural assessments.…”

Section: Exponential Curve Fitting Methodsmentioning

confidence: 99%

“…With the more detailed analysis based on competing risks [3], four different outcomes are considered for test data obtained in the brittle-to-ductile transition temperature region. These are:…”

Section: More Detailed Analysis Methodsmentioning

confidence: 99%

“…Comprehensive experimental validation has shown that the newly developed statistical methods enable efficient material characterisation. These methods are the exponential toughness data fitting method [2][3][4], the engineering lower bound toughness method [5] and the Master Curve method [6]. The novel aspect of these procedures is that the cleavage fracture toughness is regarded as a statistical quantity and hence, fracture of the material is characterised by evaluating the failure probability related to the initiation of unstable cleavage cracks.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, these statistical methods have been comprehensively validated. It can be shown that the procedures work very well for analysing cleavage fracture toughness scatter of standard C(T) specimens [3,4,9,10] with a large size range from 1/2T up to more than 4T. However, cleavage toughness data of Charpy sized SE(B) specimens show extremely large scatter and presently there is less experience with a proper statistical analysis of such data.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Fracture toughness characterisation in the ductile-to-brittle transition and upper shelf regimes using pre-cracked Charpy single-edge bend specimens

Heerens¹,

Ainsworth

Moskovic³

et al. 2005

International Journal of Pressure Vessels and Piping

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Section: Exponential Curve Fitting Methodsmentioning

confidence: 99%

Section: More Detailed Analysis Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fracture toughness characterisation in the ductile-to-brittle transition and upper shelf regimes using pre-cracked Charpy single-edge bend specimens

Heerens¹,

Ainsworth

Moskovic³

et al. 2005

International Journal of Pressure Vessels and Piping

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“…There are several quantitative descriptions of the micro-crack or void nucleation, growth and coalescence in the area ahead of the macro-crack tip. For instance, the mechanisms of the micro-separation formation depending on the material microstructure, temperature, stress and strain state (Rivalin et al 2001;Moskovic 2002;Kang 2005) have been investigated. For ferric steel, the cleavage fracture often observed at low temperature is considered as the stress controlled process which can be affected by the constraint level or stress triaxiality (Tahtinen 2000).…”

Section: Introductionmentioning

confidence: 99%

An updated continuum damage model to investigate fracture process of structures in DBTT region

Wang

Shi

et al. 2008

Int J Fract

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In the Ductile-Brittle Transition Temperature (DBTT) region, it is not realistic to take unique fracture stress or fracture strain as the fracture criterion to investigate the fracture properties. In this paper, an updated continuum damage model was proposed, in which the fracture energy density, a function of the stress triaxiality, temperature and strain rate in the transition region was taken as the critical damage factor. Uniaxial tension tests were carried out to get the basic material properties at different temperatures, to calibrate the fracture model constants and verify the validity of the damage model. The fracture behaviour of pipes with penetrating cracks under the internal pressure was experimentally investigated with the load-deflection curves and the crack propagation length captured from tests. The J -R curves were obtained from the testing results for different temperatures. Based on the Finite Element Analyses (FEA) with the proposed fracture criterion of the updated continuum damage model, the loading level of pipes with penetrating cracks were estimated and compared with the experimental results. Meanwhile the fracture processes of the pipeline structures in the transition region were reproduced. The experimental and numerical results agreed very well in present calculations. It has been shown that the fracture process in the transition region strongly depends on both the stress and strain states, and could be effectively predicted using the continuum damage model.

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Effects of ethylene‐octene copolymer (POE) on the brittle to ductile transition of high‐density polyethylene/POE blends

Liu

Wang

Zhang

et al. 2020

Polymer Engineering & Sci

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Three kinds of ethylene-octene copolymers (POE) were melt-blended with high-density polyethylene (PE-HD) in different proportions. Detailed characterizations were conducted to analyze their structural differences of POE and its effects in toughening PE-HD. The higher molecular weight POE can improve the toughness of PE-HD. 60:40 PE-HD/POE is elongated to break up to 700% while impact strength is 84.7 kJ/m 2 at −30 C, which is 21-fold of PE-HD. In the brittle to ductile transition (BDT) during impact, the fracture mechanism changes from the crazing mode to the shear yield-plastic deformation mode. The BDT temperature decreases as the POE molecular weight and its content increase. The interface strength in tension is estimated to access their effects. The Boltzmann-type models were successfully extended to describe the typical S-shaped curves in BDT of notched impact strength vs POE content or temperature. The supplementary decay model is suggested for the attenuation in toughening. Transition map in impact is proposed to select the use range of composition (c) and temperature (T) for high toughness. The curves are converted into 3D graph of T-c-impact strength for illustrating their coupling-separate effects, and further into the contour map of impact strength in T-c space for finding their partial equivalence.

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Modelling of fracture toughness data in the ductile to brittle transition temperature region by statistical analysis

Cited by 22 publications

References 8 publications

Fracture toughness characterisation in the ductile-to-brittle transition and upper shelf regimes using pre-cracked Charpy single-edge bend specimens

Fracture toughness characterisation in the ductile-to-brittle transition and upper shelf regimes using pre-cracked Charpy single-edge bend specimens

An updated continuum damage model to investigate fracture process of structures in DBTT region

Effects of ethylene‐octene copolymer (POE) on the brittle to ductile transition of high‐density polyethylene/POE blends

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