Loading rate dependence of the fracture toughness of polycrystalline tungsten

Rupp, Daniel; Weygand, Sabine M.

doi:10.1016/j.jnucmat.2010.12.118

Cited by 41 publications

(22 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has been deduced that the DBTT is strain rate dependent and there is a strong correlation with the activation energy associated with screw dislocation mobility. Moreover, the introduction of impurities increases the activation energy, implying further reduced dislocation mobility for impure tungsten which is attributed to impurity segregation at the dislocation core inhibiting the movement [11,12]. The DBTT is expected to be further increased while in operation, because of the cascade damage following the unprecedented degree of radiation that the material will be subjected to during operation.…”

Section: Introductionmentioning

confidence: 99%

Intergranular fracture of tungsten containing phosphorus impurities: A first principles investigation

Olsson

Blomqvist

2017

Computational Materials Science

View full text Add to dashboard Cite

In the present work we have studied the influence of phosphorus impurities on the grain boundary strength of tungsten by means of quantum mechanical calculations based on density functional theory. As model grain boundary we consider the Σ5(310)[001] high angle configuration. The results show that by the introduction of a clean (i.e. impurity free) grain boundary in the bulk, the strength and peak stress of the cohesive zone are reduced and they are further reduced by the introduction of impurities. This effect can be attributed to the formation of polar bonds between W and P, which leads to a weakening of the interface. Based on a thermodynamic analysis of the cohesive zone during the straining we find that diffusion of impurities may occur to retain thermodynamic equilibrium for constant chemical potential. This contributes to the gradual reduction of the peak stress related to fracture, which can contribute to diffusion driven delayed cracking, even when subjected to static loads.

show abstract

Section: Introductionmentioning

confidence: 99%

Intergranular fracture of tungsten containing phosphorus impurities: A first principles investigation

Olsson

Blomqvist

2017

Computational Materials Science

View full text Add to dashboard Cite

show abstract

“…For polycrystalline tungsten, fracture toughnesses in the range of 13-15 MPam 1=2 with a slight enhancement for tungsten-rhenium alloys have been reported by Mutoh et al [18]. In a recent study, Rupp et al [23] found the fracture toughness for pure tungsten between 13 MPam 1=2 normal to rolling direction and 8 MPam 1=2 for all other directions. In this study, a general decrease in the fracture toughness with decreasing grain size was observed, partially caused by the formation of a damage zone consisting of intergranular cracks ahead of the crack front.…”

Section: Fracture Toughnessmentioning

confidence: 78%

On the potential of tungsten–vanadium composites for high temperature application with wide-range thermal operation window

Hohe

Gumbsch²

2010

Journal of Nuclear Materials

View full text Add to dashboard Cite

“…Fracture toughness, which is a measure of resistance to fracture, is found to be smaller at lower temperatures in the http://dx.doi.org/10.1016/j.engfracmech.2015.01.017 0013-7944/Ó 2015 Elsevier Ltd. All rights reserved. fracture mechanical tests of tungsten [10,11]. The question raises as how to predict cracking patterns as we observe in the thermal shock tests using the data obtained in the fracture mechanical tests.…”

Section: Introductionmentioning

confidence: 97%

“…DBTT of tungsten ranges between 400°C and 700°C, e.g. depending on loading rate [10]. Fracture toughness, which is a measure of resistance to fracture, is found to be smaller at lower temperatures in the http://dx.doi.org/10.1016/j.engfracmech.2015.01.017 0013-7944/Ó 2015 Elsevier Ltd. All rights reserved.…”

Section: Introductionmentioning

confidence: 99%

Experimental and computational study of damage behavior of tungsten under high energy electron beam irradiation

Sommerer

Werner

et al. 2015

Engineering Fracture Mechanics

View full text Add to dashboard Cite

Extended finite element method J-integral Electron beam irradiation tests a b s t r a c t In this work, damage behavior of tungsten under high heat flux loads was investigated both numerically and experimentally assuming a single heat pulse with duration of 0.5 s. Finite element simulations revealed that the thermal steady state was reached within several milliseconds after the onset of a heat flux pulse and tensile residual stress was produced during cooling providing the driving force for crack growth. The crack initiation and growth simulations and J-integral calculation at crack tips delivered consistent results on cracking mechanism. Electron beam irradiation tests on tungsten samples were performed, which confirmed the predicted damage behavior.

show abstract

Loading rate dependence of the fracture toughness of polycrystalline tungsten

Cited by 41 publications

References 4 publications

Intergranular fracture of tungsten containing phosphorus impurities: A first principles investigation

Intergranular fracture of tungsten containing phosphorus impurities: A first principles investigation

On the potential of tungsten–vanadium composites for high temperature application with wide-range thermal operation window

Experimental and computational study of damage behavior of tungsten under high energy electron beam irradiation

Contact Info

Product

Resources

About