Thermal - Acoustic Future Fatigue of Ceramic Matric Composite Materials

Jacobs, Joseph B.; Gruensfelder, C.; Hedgecock, C.E.

doi:10.2514/6.1993-1319

Cited by 7 publications

(5 citation statements)

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“…The U.S. Air Force, NASA Langley Research Center, and McDonnell Douglas Corporation [13][14][15] carried out fatigue failure tests and observed materials and structures in high-temperature and high-noise environments. The observed environments were characterized by high temperatures (500-1000 • C) and were mainly concerned with materials such as C/SiC, C/C, and ceramic matrix composites.…”

Section: Introductionmentioning

confidence: 99%

Acoustic and Vibration Response and Fatigue Life Analysis of Thin-Walled Connection Structures under Heat Flow Conditions

Sha,

Zhao,

Tang

et al. 2024

Aerospace

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Thin-walled connection structures are commonly used in the hot-end components of aerospace vehicles. Large deflection nonlinear responses and fatigue failure occur due to their discontinuous mass distribution and prominent cross-sectional changes under the action of complex thermal, aerodynamic, and noise loads. A thermoacoustic fatigue test was carried out to obtain the acoustic and vibration responses and fatigue life changes of the connection structure under heat flow conditions in engineering applications. The high-temperature acoustic fatigue test system of aviation thin-walled structures was used, taking the high-temperature alloy thin-walled plate-load-bearing frame bolted connection structure as the research object. As a result, the vibration response and fatigue life under different thermoacoustic loads were obtained. The contact finite element method was used to simulate the connection pre-tightening force, and the coupled finite element/boundary element method was used to calculate the acoustic and vibration response of the heat flow conditions. The changing rules of the frequency response peak value at the critical point of the thin-walled connection structure under the effects of different temperature fields, fluid fields, and sound fields were obtained through the processing and analysis of the calculation results. Considering the structural vibration fatigue damage mechanism, this study employed an improved rainflow counting method to compute the rainflow circulation matrix (RFM) and rainflow damage matrix (RFD) of the vibration stress time history at critical points within the structure framework. Said method was combined with Miner’s linear cumulative damage theory to estimate the fatigue life under various thermal-fluid-acoustic coupled loads. A comprehensive analysis validates the accuracy of the established numerical simulation calculation model in identifying critical connection points within structures subjected to pre-tightening forces. This model effectively characterizes thermal, aerodynamic, and acoustic loads on high-temperature alloy thin-walled-load-bearing frame bolted connection structures. It delineates the relationship between vibration response and fatigue life while assessing the impact of three distinct load parameters.

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Section: Introductionmentioning

confidence: 99%

Acoustic and Vibration Response and Fatigue Life Analysis of Thin-Walled Connection Structures under Heat Flow Conditions

Sha,

Zhao,

Tang

et al. 2024

Aerospace

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“…J.H. Jacobs has studied the fatigue performances of composite panels subjected to high thermal level excitation by applying random fatigue equipments and progressive wave tube [12].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Vibration Response Analysis and Experimental Verification of Thin-walled Structures to Thermal-acoustic Excitations

Yu¹,

Wang²

2016

Proceedings of the 2016 4th International Conference on Machinery, Materials and Information Technology Applications

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Abstract. For the nonlinear vibration response problems of aerospace thin-walled structures to thermalacoustic excitation, the theory of structural-acoustic coupling and the coupled FEM/BEM method were used to analyze dynamic response characteristics of super-alloy thin-walled rectangular plates with four edges clamped. Based on different loading ways: diffusion field, progressive wave 0°/ 45°/ 90°, the theories of buckling and snap-through were employed to study the stress/strain response of structures which were subjected to the different thermal-acoustic loading combinations. The majority of the analyses have dealt with the influence of acoustic loading ways and thermal loadings on structure stress/strain responses, the interaction mechanism of phenomenon of buckling and snap-through on stress/strain responses. Meanwhile, the experimental verifications of nature frequencies and strain have been done, respectively. The analysis results will provide a reference to determine a reasonable fatigue life prediction model.

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“…The dual effect of high acoustic and the thermal loadings will result in degradation of material properties and large static (thermal) stresses superimposed on random dynamic stresses and has given rise to the so-called thermal-acoustic sonic fatigue issue [1]. For example, the ceramic matrix composite (CMC) TPS panels have been tested at 160 dB OASPL and 1000 ∘ F for eight minutes in MDA'S high temperature progressive wave chamber, and the tests' results showed that the first CMC face-sheet on the hot side of the panel had almost completely delaminated, which also created a crack in the foam core material due to the combined thermal acoustic loadings [2]. In addition, it was found that the failure occurred in the attachment techniques due to the acoustic excitation for carbon/carbon TPS panels, which have been tested at 163 dB.…”

Section: Introductionmentioning

confidence: 99%

Thermal-Acoustic Fatigue of a Multilayer Thermal Protection System in Combined Extreme Environments

Liu

Guo

2014

Advances in Mechanical Engineering

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In order to ensure integrity of thermal protection system (TPS) structure for hypersonic vehicles exposed to severe operating environments, a study is undertaken to investigate the response and thermal-acoustic fatigue damage of a representative multilayer TPS structure under combined thermal and acoustic loads. An unsteady-state flight of a hypersonic vehicle is composed of a series of steady-state snapshots, and for each snapshot an acoustic load is imposed to a static steady-state TPS structure. A multistep thermalacoustic fatigue damage intensity analysis procedure is given and consists of a heat transfer analysis, a nonlinear thermoelastic analysis, and a random response analysis under a combined loading environment and the fatigue damage intensity has been evaluated with two fatigue analysis techniques. The effects of thermally induced deterministic stress and nondeterministic dynamic stress due to the acoustic loading have been considered in the damage intensity estimation with a maximum stress fatigue model. The results show that the given thermal-acoustic fatigue intensity estimation procedure is a viable approach for life prediction of TPS structures under a typical mission cycle with combined loadings characterized by largely different time-scales. A discussion of the effects of the thermal load, the acoustic load, and fatigue analysis methodology on the fatigue damage intensity has been provided.

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Thermal - Acoustic Future Fatigue of Ceramic Matric Composite Materials

Cited by 7 publications

References 0 publications

Acoustic and Vibration Response and Fatigue Life Analysis of Thin-Walled Connection Structures under Heat Flow Conditions

Acoustic and Vibration Response and Fatigue Life Analysis of Thin-Walled Connection Structures under Heat Flow Conditions

Nonlinear Vibration Response Analysis and Experimental Verification of Thin-walled Structures to Thermal-acoustic Excitations

Thermal-Acoustic Fatigue of a Multilayer Thermal Protection System in Combined Extreme Environments

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