Application of A New Thermal-Mechanical Coupling Solver for Ablation

Fu, Rui; Weng, Haoyue; Wenk, Jonathan F.; Martin, Alexandre

doi:10.2514/6.2016-4432

Cited by 2 publications

(2 citation statements)

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“…3,4 The data gained in such experiments will be provided as validation data for high fidelity material response codes, 6,5 and spallation modeling efforts. 7,8 For the investigation of gas-surface interactions as conducted in the HYMETS facility earlier but without spatial resolution, 9 a setup was developed which images the stagnation line in front of a sample onto the entrance slit of a spectrometer. This arrangement provided an effective spatial resolution of 0.3 mm over a length of 22 mm covering the entire distance from the sample surface to a position upstream of the bow shock.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Ablation Product Radiation Signatures of PICA and FiberForm

Winter

Butler

Danehy

et al. 2016

46th AIAA Thermophysics Conference

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Emission spectroscopy measurements in the post-shock layer in front of low density ablative material samples of different shapes were obtained in the NASA Langley HYMETS arcjet facility. A horizontal line of measurement positions was imaged on the entrance slit of the spectrometer allowing detection of the entire stagnation line in front of the samples. The stagnation line measurements were used to compare the post-shock layer emission signatures in front of PICA and FiberForm. The emission signatures of H, NH, and OH are characteristic for pyrolysis gases and consequently were only observed in front of the PICA samples. CN and C were found in front of both materials and are mainly due to interactions of the carbon fibers with the plasma. In all tests with instrumented samples, the emission of Mn, Cr, and Ni was observed when the thermocouple temperatures reached or exceeded ~1,500 K, strongly indicating erosion of the molten thermocouple tips. Temperatures in the post-shock layer were estimated from comparing the CN band emission to spectral simulation. The resulting rotational and vibrational temperatures were on the order of 7,000 to 9,000 K and close to each other indicating a plasma condition close to equilibrium. In addition to the stagnation line configurations, off-axis lines of observation were investigated to gather information about spalled particles in the flow. From a comparison of measured continuum emission with simulated Planck radiation, average particle temperatures along the measured line of observation were determined for two cases. Particle temperatures between 3,500 and 2,000 K were found. A comprehensive investigation of the entire amount of data set is ongoing.

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Section: Introductionmentioning

confidence: 99%

Characterization of Ablation Product Radiation Signatures of PICA and FiberForm

Winter

Butler

Danehy

et al. 2016

46th AIAA Thermophysics Conference

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“…Engineering practice has shown that rock bolting is more effective in enhancing roadways than metal support, wood support and joint support [3][4]. Being the most widely used mode of rock anchoring, resin anchoring embeds the anchor into the surrounding rock of the roadway, and bonds it with the rock by unsaturated polyester [4][5][6][7][8][9]. Compared with cement mortar and other rock anchoring materials, the resin material solidifies fast, realizes efficient support, and facilitates construction [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior and Reliability of Anchoring Resin under Thermomechanical Coupling

Wang¹,

Feng²

2019

IJHT

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This paper attempts to disclose the mechanical behavior and deformation performance of the resin anchor of the roadway in high temperature, deep mines, under the coupling between stress and temperature. Drawing on the relevant theories on thermomechanical coupling, this paper tests the strength, elastic modulus, Poisson's ratio and rheological performance of the anchoring resin under thermomechanical coupling, and compares the pull-out and rheological performances of the resin anchored layer under different temperatures and stresses. The results show that: With the increase in test temperature, the anchoring resin witnessed a gradual decline in its compressive strength and yield stress, a continuous decrease of its elastic modulus, a gradual growth in the Poisson's ratio, and a reduction in the yield point; The rheological deformation of the anchoring resin is affected by test temperature and stress; There is a negative correlation between the ambient temperature and the pull-out force needed to displace the anchoring resin by a certain distance, under the high temperature environment; In high-temperature, deep mines, anchoring resin is significantly affected by the ambient temperature and stress. The research findings lay the theoretical basis for the advancement of roadway support technique in deep mines under thermomechanical coupling.

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Application of A New Thermal-Mechanical Coupling Solver for Ablation

Cited by 2 publications

References 20 publications

Characterization of Ablation Product Radiation Signatures of PICA and FiberForm

Characterization of Ablation Product Radiation Signatures of PICA and FiberForm

Mechanical Behavior and Reliability of Anchoring Resin under Thermomechanical Coupling

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