Strength Anisotropy of NITE-SiC/SiC Composite by Various Failure Modes

Choi, Yongbum; Hinoki, Tatsuya; Ozawa, Kazumi; Katoh, Yutai; Matsugi, Kazuhiro; Tulugan, Kelimu

doi:10.2320/matertrans.m2012182

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…As mentioned in the literature, SiC-SiC exhibits a quasi-ductile behaviour. This means that above a certain stress level, called proportional limits [38], damage starts to appear inside the material, changing its behaviour (stiffness), but it is still able to withstand considerably higher stresses up to the fracture strength. This feature is not considered in the Tsai-Wu failure criterion used in previous numerical models (see section 3.3), where the failure is assumed to happen at the proportional limit (as a conservative assumption).…”

Section: Analysis Of the Substratesmentioning

confidence: 99%

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High intensity proton beam impact at 440 GeV/c on Mo and Cu coated CfC/graphite and SiC/SiC absorbers for beam intercepting devices

Maestre¹,

Bahamonde²,

Garcia³

et al. 2022

J. Inst.

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Beam Intercepting Devices (BIDs) are essential protection elements for the operation of the Large Hadron Collider (LHC) complex. The LHC internal beam dump (LHC Target Dump Injection or LHC TDI) is the main protection BID of the LHC injection system; its main function is to protect LHC equipment in the event of a malfunction of the injection kicker magnets during beam transfer from the SPS to the LHC. Several issues with the TDI were encountered during LHC operation, most of them due to outgassing from its core components induced by electron cloud effects, which led to limitations of the injector intensity and hence had an impact on LHC availability. The absorbing cores of the TDIs, and of beam intercepting devices in general, need to deal with high thermo-mechanical loads induced by the high intensity particle beams. In addition, devices such as the TDI — where the absorbing materials are installed close to the beam, are important contributors to the accelerator impedance budget. To reduce impedance, the absorbing materials that make up the core must be typically coated with high electrical conductivity metals. Beam impact testing of the coated absorbers is a crucial element of development work to ensure their correct operation. In the work covered by this paper, the behaviour of several metal-coated absorber materials was investigated when exposed to high intensity and high energy proton beams in the HiRadMat facility at CERN. Different coating configurations based on copper and molybdenum, and absorbing materials such as isostatic graphite, Carbon Fibre Composite (CfC) and Silicon Carbide reinforced with Silicon Carbide fibres (SiC-SiC), were tested in the facility to assess the TDI's performance and to extract information for other BIDs using these materials. In addition to beam impact tests and an extensive Post Irradiation Examination (PIE) campaign to assess the performance of the coatings and the structural integrity of the substrates, extensive numerical simulations were carried out.

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Section: Analysis Of the Substratesmentioning

confidence: 99%

“…A detailed mechanical characterization, including failure analysis of this particular SiC-SiC composite, can be found in ref. [37,38] and is used as baseline for the present study.…”

Section: Jinst 17 P01019mentioning

confidence: 99%

High intensity proton beam impact at 440 GeV/c on Mo and Cu coated CfC/graphite and SiC/SiC absorbers for beam intercepting devices

Maestre¹,

Bahamonde²,

Garcia³

et al. 2022

J. Inst.

View full text Add to dashboard Cite

show abstract

“…As mentioned on the literature, SiC-SiC exhibits a quasi-ductile behaviour. This means that above at certain stress level, called proportional limits [38], damage starts to appear inside the material, changing its behaviour (stiffness), but it is still able to withstand considerably higher stresses up to the fracture strength. This feature is not considered in the Tsai-Wu failure criterion used in previous numerical models (see Sec.…”

Section: Analysis Of the Substratesmentioning

confidence: 99%