Thermal Stress Resistance of Materials

Lanin, A. G.; Fedik, I. I.

doi:10.1007/978-3-540-71400-2

Cited by 27 publications

(12 citation statements)

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“…A new criterion for estimating the bearing ability of thermally loaded products was introduced, which was accepted by the scientific community worldwide [9]. The data on the physico-mechanical properties of many refractory compounds and their compositions (some of them were used in devices for the first time) revealed the possibilities of these materials and influenced the determination of their operating conditions and estimates of their prospects.…”

Section: Materials Of the Reactor Corementioning

confidence: 99%

“…The effective surface energy depends on the environment in a complicated way. The thermal strength, which is the most important characteristic of the efficiency of HRA construction elements, is determined by a set of physico-mechanical parameters [9,11] denoted as…”

Section: Influence Of Structural Parameters On the Thermal Strengthmentioning

confidence: 99%

“…Based on the concepts of force destruction mechanics, a new criterion factor N was introduced [9,11] which took the stress distribution into account and determined conditions of the total or partial destruction of bodies upon changing this stressed state. The values of the parameter N for different types of thermal loading were calculated numerically.…”

Section: Productmentioning

confidence: 99%

See 2 more Smart Citations

Selecting and using materials for a nuclear rocket engine reactor

Lanin¹,

Fedik²

2011

Phys.-Usp.

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Section: Materials Of the Reactor Corementioning

confidence: 99%

Section: Influence Of Structural Parameters On the Thermal Strengthmentioning

confidence: 99%

Section: Productmentioning

confidence: 99%

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Selecting and using materials for a nuclear rocket engine reactor

Lanin¹,

Fedik²

2011

Phys.-Usp.

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“…[1][2][3][4][5][6][7][8][9][10][11][12]), including electronic, opto-electronic, and photonic assemblies (see, e.g., Refs. [13][14][15][16][17][18][19]).…”

Section: Introductionmentioning

confidence: 99%

Analysis of a Bow-Free Prestressed Test Specimen

Suhir

Nicolics²

2014

Journal of Applied Mechanics

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Broadening the temperature range in accelerated testing o f electronic products is a typical measure to assure that the product o f interest is sufficiently robust. At the same time, a too broad tem perature range can lead to the shift in the modes and mechanisms o f failure, i.e., result in failures that will not occur in actual opera tion conditions. Application o f mechanical prestressing o f the test specimen could be an effective means fo r narrowing the tempera ture range during accelerated testing and thereby achieving trust worthy and failure-mode-shift-free accelerated test information. Accordingly, simple engineering predictive models are developed for the evaluation o f the magnitude and the distribution o f thermal and mechanical stresses in a prestressed bow-free test specimen. A design, in which an electronic or a photonic package is bonded between two identical substrates, is considered. Such a design is of ten employed in some today's packaging systems, in which the "inner," functional, component containing active and/or passive devices and interconnects is placed between two identical "outer" components (substrates). The addressed stresses include normal stresses acting in the component cross sections and the interfacial shearing and peeling stresses. Although the specimen as a whole remains bow-free, the peeling stresses might be nevertheless appre ciable, since the outer components, if thin enough, deflect to a greater or lesser extent with respect to the inner component. The numerical example has indicated that the maxima o f the interfacial thermal shearing and peeling stresses are indeed comparable and that these maxima are on the same order o f magnitude as the nor mal thermal stresses acting in the components' cross sections. It is shown that since the thermal and the prestressing mechanical loads are o f different physical nature, the stresses caused by these two load categories are distributed differently over the specimen's length. It is shown also that although it is possible and even advisa ble to apply mechanical prestressing fo r a lower temperature range, it is impossible to reproduce the same stress distribution as in the case o f thermal loading. The obtained results enable one to shed light on the physics o f the state o f stress in prestressed bowfree test specimens in electronics and photonics engineering.

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“…[1,28,29] In order to achieve original thermal shock resistance at low carbon levels the following strategies have been proposed: [30] i) Optimization of the bricks elastic moduli and strength via careful microstructure design using fine graphite to replace coarse graphite, because the former could be dispersed in the matrix more homogeneously than the latter using nanosized carbon and carbon nanofibers by using coated (e.g. SiC coated carbon nanopowders and carbon nanofibers) in order to achive homogeneous dispersions in aqueous media and to prevent rapid oxidation due redox reactions and criticial oxygen concentrations by tailoring the microstructure of low elastic moduli MgO grains (e.g.…”

Section: Introductionmentioning

confidence: 99%

Reinforced Cellular Carbon Matrix–MgO Composites for High Temperature Applications: Microstructural Aspects and Colloidal Processing

Silveira

Falk

2011

Adv Eng Mater

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The main potential of functionalized cellular carbon refractories is the considerable variation range of cell dimensions, cell geometries, i.e. spatial arrangement of interconnected carbon strut networks, as well as cell compositions, i.e. layered or multilayered cell conformations. In order to achieve this last goal, it will have to provide available post‐processing procedures to upgrade cellular carbon matrices for specific functions, i.e. tailored moduli of elasticity, thermal shock resistance, that cannot be technically or economically provided by conventional low carbon MgO–C refractories.1 Here we report different colloidal synthetic processing routes for tailoring reinforced cellular and reticulated glassy carbon structures in the macro‐, meso‐, and microscale, which then gives rise to very high thermal shock resistance characteristics. The cellular interconnected glassy carbon network is processed by replication of PU foams with phenolic resins and subsequent carbonization in inert atmospheres. In order to improve the water‐wettability of tailored glassy carbon cellular matrices and to ease the subsequent infiltration of aqueous MgO suspensions into open porous, cellular carbon structures a low cost YSZ, and SiC coating concept is proposed using an electrophoretic deposition (EPD) method and subsequent sintering in order to achieve the reinforcement of carbon phase, respectively. These as‐received wettable and reinforced coatings and functional layers on the interconnected cellular glassy carbon network are able to reliably allow the infiltration of aqueous MgO suspensions to build up low carbon functional C/SiC‐ as well as C/YSZ–MgO refractories with designed and controlled thermo‐mechanical properties.

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Thermal Stress Resistance of Materials

Cited by 27 publications

References 0 publications

Selecting and using materials for a nuclear rocket engine reactor

Selecting and using materials for a nuclear rocket engine reactor

Analysis of a Bow-Free Prestressed Test Specimen

Reinforced Cellular Carbon Matrix–MgO Composites for High Temperature Applications: Microstructural Aspects and Colloidal Processing

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