Influence of stress triaxiality upon ductile crack propagation

Holland, D.; Halim, A.; Dahl, Winfried

doi:10.1002/srin.199000388

Cited by 21 publications

(3 citation statements)

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“…Notched round bars experience higher triaxiality than un-notched round bars when subjected to tension. The fracture strains of notched specimens are found to be less than those of the un-notched round bars (Hancock and Mackenzie, 1976;Holland et al, 1990). The relationship between the plastic strain at fracture and the hydrostatic pressure is determined from a particular load condition -the generalized tension.…”

Section: Hydrostatic Pressure Sensitivitymentioning

confidence: 98%

Damage accumulation and fracture initiation in uncracked ductile solids subject to triaxial loading

Xue

2007

International Journal of Solids and Structures

440

180

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A damage plasticity model for ductile fracture is proposed. This model is established on the cylindrical coordinate system of principal stress space. Experimental results show that fracture initiation in uncracked ductile solids is sensitive to the hydrostatic pressure and dependent on the Lode angle. The joint effects of pressure and Lode angle define a fracture envelope in principal stress space. Plastic deformation induced damage is calculated by an integral of the damage rate measured at current loading and deformation status with respect to the fracture envelope. A power law damage rule is proposed to characterize the nonlinearity in damage accumulation. A damage-related weakening factor is adopted to describe the material deterioration. The material parameters are calibrated from standard laboratory tests. The proposed model is numerically implemented. Four simulations with emphasis on crack path prediction are presented.

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Section: Hydrostatic Pressure Sensitivitymentioning

confidence: 98%

Damage accumulation and fracture initiation in uncracked ductile solids subject to triaxial loading

Xue

2007

International Journal of Solids and Structures

440

180

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“…Many experimental investigations have demonstrated that the fracture strain (see Eq 6) strongly depends on stress triaxiality (Ref [37][38][39][40][41]. Two methodologies are typically used to evaluate the stress triaxiality: the first one is analytical and is based on the Bridgman analysis (Ref 42) and the second is numerical and based on FE simulations.…”

Section: 21mentioning

confidence: 99%

Micromechanics-Based Damage Analysis of Fracture in Ti5553 Alloy with Application to Bolted Sectors

Bettaieb

Hoof²,

Minnebo³

et al. 2015

J. of Materi Eng and Perform

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A physics-based, uncoupled damage model is calibrated using cylindrical notched round tensile specimens made of Ti5553 and Ti-6Al-4V alloys. The fracture strain of Ti5553 is lower than for Ti-6Al-4V in the full range of stress triaxiality. This lower ductility originates from a higher volume fraction of damage sites. By proper heat treatment, the fracture strain of Ti5553 increases by almost a factor of two, as a result of a larger damage nucleation stress. This result proves the potential for further optimization of the damage resistance of the Ti5553 alloy. The damage model is combined with an elastoviscoplastic law in order to predict failure in a wide range of loading conditions. In particular, a specific application involving bolted sectors is addressed in order to determine the potential of replacing the Ti-6Al-4V by the Ti5553 alloy.

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“…It can be observed [25][26][27][28] that the stress triaxiality can provide a simple parameter to identify the type of collapse: stress triaxiality lower than zero (t = 0 corresponds to a pure shear situation) produces a shear-type plastic flow collapse, which can be identified as a special case of fracture process, while positive triaxiality produces a void formation-type fracture process (fracture along a direction normal to the principal stress) [27,28]. Experimental observations [21] have shown that fracture never occurs for t £ -1 3.…”

mentioning

confidence: 93%

Some considerations on failure of solids and liquids

Brighenti

Carpinteri

2010

Strength Mater

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539.4Failure phenomena in continuum media, either solids or liquids, can be regarded as a single physical phenomenon which mathematically can be identified by the fulfilment of a limit condition usually involving the stressed state of the material. By considering classical failure theories in the context of solids (plasticity and fracture mechanics approach) and a recent theory on the rupture in liquids (cavitation phenomenon based on the maximum principal stress), common peculiarities of the failure conditions for both classes of materials are presented. Finally, by introducing a stress field parameter, the stress triaxiality, which can be used to identify the limit condition of collapse for both classes of the considered materials, some unified considerations on solid and liquid collapse are made. It is shown that the collapse functions for both classes of continuum materials have present a similar form.

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Influence of stress triaxiality upon ductile crack propagation

Cited by 21 publications

References 0 publications

Damage accumulation and fracture initiation in uncracked ductile solids subject to triaxial loading

Damage accumulation and fracture initiation in uncracked ductile solids subject to triaxial loading

Micromechanics-Based Damage Analysis of Fracture in Ti5553 Alloy with Application to Bolted Sectors

Some considerations on failure of solids and liquids

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