Dynamic Young’s moduli of tungsten and tantalum at high temperature and stress

Škoro, G.; Bennett, J.R.J.; Edgecock, R.; Gray, Simon; McFarland, A.; Booth, C. N.; Rodgers, Kristina; Back, J. J.

doi:10.1016/j.jnucmat.2010.12.222

Cited by 41 publications

(21 citation statements)

References 4 publications

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“…Worst-case values in a Hall thruster might be I H 2 A, B 200 G, L 0.5 cm, and I πr 4 p ∕4 1.2 × 10 −9 cm 4 with a 0.0125cm diameter filament. Young's modulus for tungsten is 411 GPa at room temperature, but drops to ∼300 GPa at emissive temperatures [107]. In this case, the displacement is only ∼10 −4 cm.…”

Section: B Magnetic Fieldsmentioning

confidence: 86%

Recommended Practice for Use of Emissive Probes in Electric Propulsion Testing

Sheehan

Raitses

Hershkowitz

et al. 2017

Journal of Propulsion and Power

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This article provides recommended methods for building, operating, and taking plasma potential measurements from electron-emitting probes in electric propulsion devices, including Hall thrusters, gridded ion engines, and others. The two major techniques, the floating point technique and the inflection point technique, are described in detail as well as calibration and error-reduction methods. The major heating methods are described as well as the various considerations for emissive probe construction. Special considerations for electric propulsion plasmas are addressed, including high-energy densities, ion flows, magnetic fields, and potential fluctuations. Recommendations for probe design and operation are provided.

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Section: B Magnetic Fieldsmentioning

confidence: 86%

Recommended Practice for Use of Emissive Probes in Electric Propulsion Testing

Sheehan

Raitses

Hershkowitz

et al. 2017

Journal of Propulsion and Power

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“…tungsten elasticity moduli as a function of temperature obtained by our work and compared to data calculated using the results of reference[23] (a) Elasticity moduli of tungsten obtained in this work compared to those calculated according to the result of reference[23] (b) Deviation percent of the young's modulus results from those of reference[23].…”

mentioning

confidence: 92%

“…The most required metallurgic characteristic in this context is the elevated temperature dynamic elasticity [11][12][13] that helps in developing advanced metallic grads of refractory materials [14][15][16][17][18]. Many technique were developed to measure the dynamic elastic moduli [19][20][21] but fewer is suitable for elevated temperatures [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41]. One of the prominent technique used to measure the dynamic young's modulus of tungsten at high stresses and temperatures, is the laser Doppler vibrometry of a wire sample induced by high current pulses [23].…”

Section: Introductionmentioning

confidence: 99%

“…Many technique were developed to measure the dynamic elastic moduli [19][20][21] but fewer is suitable for elevated temperatures [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41]. One of the prominent technique used to measure the dynamic young's modulus of tungsten at high stresses and temperatures, is the laser Doppler vibrometry of a wire sample induced by high current pulses [23]. This technique enable measurements in the range from room temperature to 2650 C. A second order parametric equation is used for fitting the experimentally obtained Young's modulus data over the mentioned thermal range on the form:…”

Section: Introductionmentioning

confidence: 99%

“…Where the equivalent temperature function, is the emissivity of the wire surface at measured temperature (depends on surface roughness ), the electric current pulse intensity pulse duration and repetition rate . using laser Doppler vibrometry and pulse current heating technique [23] So many sources of error are involved in this procedure, where the most important are those based on temperature calibration and non-linear thermal distribution along the wire sample, caused by clamps thermal cooling or "end-loss" [42][43][44][45][46][47]. Table 1.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Young’s modulus of tungsten at elevated temperatures using synchronous laser shadow vibrometry

Ayoub

El-Sherif

Hassan

et al. 2018

The International Conference on Mathematics and Engineering Phy

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This paper presents the use of an improved laser shadowgraphy method for measuring the dynamic elastic moduli of tungsten, from room temperature to near melting point. The method is based on measuring the frequency of impulse induced longitudinal vibration of a tungsten filament, subject to joule heating. The natural resonance frequency of the filament is obtained by lock-in synchronous photo-detection of the laser generated filament shadowgraph. The correlation between the filament natural frequency and its temperature lead to the calculation of shear modulus at variable temperatures, the tensile and bulk modului of tungsten. The results were compared to those obtained by laser Doppler vibrometry of a tungsten wire induced by pulsed current technique. Our method permitted a wider measuring temperature range and an easier calculation procedure. The used setup was simple, non-destructive, non-contacting and accurate, enabling low cost vibrometry measurements that help in future synthesis and test of new grades of refractory materials, deployed as plasma facing material in the latest fusion reactor or super alloys in critical applications.

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Effects of Unit Cell Topology on the Mechanical Properties of Porous Tantalum Structures via Laser Powder Bed Fusion

Yang

et al. 2023

Adv Eng Mater

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Additive manufacturing (AM) of porous tantalum scaffolds receives extensive attention because the demands for tantalum implants grow rapidly. Understanding the effects of unit cell topology on the mechanical properties of porous tantalum scaffold structures is critical for durable implant design, but it is still lacking. Herein, porous tantalum structures with two types of unit cells (body‐centered cubic [BCC] and body‐centered cubic deformation [BCC‐D]) are additively manufactured with laser powder bed fusion (LPBF). The geometric characteristics and mechanical properties of the manufactured structures are comparatively studied. It is found that the mechanical properties of BCC porous tantalum in the building and horizontal directions are discovered to be nearly identical, with elastic modulus and yield strength of nearly 1.9 GPa and 56 MPa, respectively. Unit cell topology dominates the mechanical anisotropy and compressive failure mode of porous tantalum. The mechanical properties of the BCC‐D topology are anisotropic, and the fracture morphology indicates that it is a cleavage fracture and a minor ductile fracture. The capacity to finely control the mechanical properties of porous tantalum structure through unit cell topology is prominent for optimizing implant structure for personalized medical care.

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Dynamic Young’s moduli of tungsten and tantalum at high temperature and stress

Cited by 41 publications

References 4 publications

Recommended Practice for Use of Emissive Probes in Electric Propulsion Testing

Recommended Practice for Use of Emissive Probes in Electric Propulsion Testing

Young’s modulus of tungsten at elevated temperatures using synchronous laser shadow vibrometry

Effects of Unit Cell Topology on the Mechanical Properties of Porous Tantalum Structures via Laser Powder Bed Fusion

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