A Path Dependent Model for Ductile Fracture

Goldthorpe, B.D.

doi:10.1051/jp4:19973120

Cited by 13 publications

(16 citation statements)

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“…After extensive testing, Goldthorpe found that the fracture criterion was a material property [6]. This gave rise to the material constant, S C , which dictates when a ductile material will fail.…”

Section: Goldthorpe Path-dependent Ductile Failure Constitutive Modelmentioning

confidence: 99%

“…This is because the failure and fracture of a material is driven by the deformation model which dictates the stress system and the degree of localisation. The Goldthorpe path-dependent ductile failure model is an extension of the Rice and Tracey model [5], and acknowledges ductile failure is caused by a combination of shear and void growth under hydrostatic tension [6].…”

Section: Goldthorpe Path-dependent Ductile Failure Constitutive Modelmentioning

confidence: 99%

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Scale effects in necking

Dunnett

Balint

MacGillivray

et al. 2012

EPJ Web of Conferences

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Abstract. Geometrically similar specimens spanning a scale range of 100:1 are tested quasi-statically to failure. Images of neck development are acquired using optical means for large specimens, and in-situ scanning electron microscope testing for small specimens, to examine the dependence of neck geometry on a broad range of specimen sizes. Size effects typically arise when the smallest specimen dimension is on the order of a microstructural length (e.g. grain size, dislocation mean free path, etc.), or in the presence of significant plastic strain gradients, which increase the density of geometrically necessary dislocations. This study was carried out for the purpose of investigating scale dependence in models used for predicting dynamic deformation and damage to very high strains for ballistic impact applications, such as the Goldthorpe path-dependent failure model, which includes temperature and strain-rate dependence but does not account for specimen size or a dependence on microstructural lengths. Although the experiments show that neck geometry does not exhibit a clear dependence on specimen size across the range of length scales tested, the statistical variation due to microstructural variations was found to increase monotonically with decreasing size, becoming significant for the smallest (0.35 mm diameter) size, allowing a limit to be identified for reliable model calibration.

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Section: Goldthorpe Path-dependent Ductile Failure Constitutive Modelmentioning

confidence: 99%

Section: Goldthorpe Path-dependent Ductile Failure Constitutive Modelmentioning

confidence: 99%

Scale effects in necking

Dunnett

Balint

MacGillivray

et al. 2012

EPJ Web of Conferences

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show abstract

“…The materials used in this programme fail by a ductile fracture mechanism based on the growth, coalescence and nucleation of voids in the deformation regimes of interest. The Goldthorpe Path Dependent Fracture (PDF) model has been developed for ductile fracture processes [5] and is based on a novel correction term for the stresses in a sharp neck in a tensile specimen, which can be applied to void growth. The model has been applied to the growth and nucleation of voids under different stress systems and has also been used to successfully analyse the classic Bridgman data for steels [6].…”

Section: Penetrator Designmentioning

confidence: 99%

Demonstration of survivable space penetrator

Church¹,

Huntington-Thresher²,

Bruce³

et al. 2012

AIP Conference Proceedings

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Abstract. This work was performed in support of MoonLITE which is a proposed UK space mission to the moon. The basic premise is to deploy 4 instrumented penetrators, one each on the near-side, farside and at the poles of the moon, with an impact velocity of approximately 300m/s. The primary science aims are to set up a passive seismometer network, investigate the presence of water and volatiles and determine thermal gradients in the lunar soil (i.e. regolith). A key requirement is that the penetrator shell survives the impact together with the instrument payload and supporting subsystems. The material chosen for the penetrator shell was 7075 aluminium alloy, which is a good compromise between high compressive strength and low mass. The baseline penetrator design was evaluated and refined using the DYNA3D hydrocode to determine the survivability of the penetrator in sand at an impact velocity of 300m/s and an attack angle of 8°. The simulations predicted that the penetrator design would survive this severe impact condition which was confirmed by experiments on the Pendine rocket test track.

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“…The Goldthorpe Path Dependent Fracture (PDF) Model was used to describe the multi-mode ductile and shear fracture processes [9]. The form is as follows: - …”

Section: Cullis Et Al / International Journal Of Impact Engineeringmentioning

confidence: 99%

Towards predictive modelling for concrete

Cullis¹,

Gilbert²,

Church³

et al. 2008

International Journal of Impact Engineering

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Simulations are becoming an increasingly important part of the weapon design cycle allowing the investigation of more parameters in warhead concepts. This relies on a thorough verification & validation process for the simulation tools, which enables a cost effective approach to down-selecting concepts for full-scale experiments. A key factor in this process applied to the design of warheads to defeat hard (structural) targets is the development of truly physically based material models for geological materials where constants are either derived or measured. The paper describes this general approach and highlights aspects of its initial application to kinetic energy (KE) penetration and suggests areas for future investigation.

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A Path Dependent Model for Ductile Fracture

Cited by 13 publications

References 0 publications

Scale effects in necking

Scale effects in necking

Demonstration of survivable space penetrator

Towards predictive modelling for concrete

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