Residual Strain Measurement of C/C-SiC Tubes at High Temperature

Wimpory, Robert C.; Ohms, Carsten; Horňák, P.; Neov, D.; Youtsos, A.G.

doi:10.4028/0-87849-414-6.665

Cited by 2 publications

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“…It was noticed that the uncertainty in stress determination quoted, i.e. the one based on standard analysis (using neutron diffraction) tended to be under-estimated [2]: this was especially evident in the weld region and one of the reasons was suspected to be grain size issues as the grains were larger within the weld compared to the parent material. Subsequently a simple model was developed that indicated the extra uncertainty that was due to grain-size effects [3].…”

Section: Introductionmentioning

confidence: 99%

A complete reassessment of standard residual stress uncertainty analyses using neutron diffraction emphasizing the influence of grain size

Wimpory

Martins

Hoffman

et al. 2018

International Journal of Pressure Vessels and Piping

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The determination of residual stress in engineering materials with large grains is a challenge when it comes to using diffraction techniques. Not only are the accuracies of the residual stresses themselves important but also the accurate evaluation of their uncertainties. An austenitic steel three-pass slot weld (NeT- TG4) with varying grain size high-lights the potential problems with the data evaluation when grain size is not taken into account whilst measuring strain. Neutron diffraction results are compared with each other (with combinations of slit and radial oscillating collimator beam defining optics) and with high energy synchrotron radiation results with a spiral slit gauge volume defining system. The impact of the grain size on the determination of residual stresses and their associated uncertainties when using diffraction techniques in engineering components is emphasized and discussed. A simple model to estimate the extra random uncertainty contribution due to the so-called grain size statistics is applied and verified. The benefit of continuous or stepwise oscillation to increase the number of detected grains on the detector is discussed together with how to optimize the time of a measurement. From the data obtained, best practice guidelines will be suggested on dealing with large grains when determining strain and stress with neutron diffraction

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Section: Introductionmentioning

confidence: 99%

A complete reassessment of standard residual stress uncertainty analyses using neutron diffraction emphasizing the influence of grain size

Wimpory

Martins

Hoffman

et al. 2018

International Journal of Pressure Vessels and Piping

Self Cite

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confidence: 99%

“…For high temperature heat exchangers, if thick tubes are needed (over 1 mm and up to 10 mm) [13], the structure of the material is commonly made of woven tissues of carbon or silicon carbide fibers, rolled on a mandrel and embedded in a resin. Its pyrolysis combined with Melt Infiltration (MI) lead to the sample densification [13] [14]. However, this technique is not suitable for thin layer materials considered for fuel cladding (< 1 mm), which is around the thickness of the 2.5D woven fabrics made of Hi-Nicalon S fibers, even though 80% dense materials can be manufactured [15].…”

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Influence of an original manufacturing process on the properties and microstructure of SiC/SiC tubular composites

Braun

Sauder

Lamon

et al. 2019

Composites Part A: Applied Science and Manufacturing

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SiC/SiC composites reinforced with Hi-Nicalon S 3 rd generation SiC fibers are promising candidates for high temperature aeronautical applications and fuel cladding in nuclear reactors. An original patented process was used to produce SiC/SiC tubular samples for dimensional and tensile mechanical characterizations. The process route is described in detail to further understanding of specific features.SiC/SiC samples show a low porosity and excellent geometrical tolerance. Highly reproducible tensile mechanical behavior is observed with good mechanical failure characteristics. Some specific features were highlighted during mechanical characterizations with loading/unloading sequences. For instance, an original mechanical behavior was observed before the onset of matrix multicracking (deviation from linearity). To our knowledge, it is the first time that this kind of behavior has been detected on SiC/SiC composites, due to the processing route leading to the microstructure of specific samples. 1. Introduction Among the Ceramic Matrix Composites (CMC), SiC/SiC composites and affiliates have aroused interest for challenging high-temperature applications such as aerospace [1], aeronautics [2], defense [3] or nuclear applications [4] for their excellent mechanical properties [5] and oxidation resistance [6] at

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Residual Strain Measurement of C/C-SiC Tubes at High Temperature

Cited by 2 publications

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A complete reassessment of standard residual stress uncertainty analyses using neutron diffraction emphasizing the influence of grain size

A complete reassessment of standard residual stress uncertainty analyses using neutron diffraction emphasizing the influence of grain size

Influence of an original manufacturing process on the properties and microstructure of SiC/SiC tubular composites

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