Nonlinear Response and Fatigue Life Prediction of Thin-Walled Structures under Thermo-Acoustic Loadings

Sha, Yun; Wei, Jing; Gao, Zhi Jun

doi:10.4028/www.scientific.net/amm.157-158.1204

Cited by 5 publications

(6 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the basis of the variation characteristic of the first order natural frequency [18], we can deduce that the critical buckling temperature is around 100℃. In pre-buckling, the structure is in softening region, stiffness reduces and the first order natural frequency becomes lower with the increasing of temperature; in postbuckling, the structure is in hardening region, stiffness increases and the first order natural frequency becomes higher with the increasing of temperature, as shown in figure 2.…”

Section: Loading Waysmentioning

confidence: 97%

“…In China, Professor Sha Yun-dong and his coworkers have already done lots of research work about thermal-acoustic response and fatigue life of flight vehicles thin-walled structures, and published numbers of literatures [13][14][15][16][17][18]. For example, in Ref.…”

Section: Introductionmentioning

confidence: 99%

“…For example, in Ref. 18 Wei jing has calculated dynamic response of titanium alloy plate with four edges simply supported to random excitations and analyzed thermal buckling and nonlinear snap-through responses. As a result, she found that the influence ways of thermal loads and acoustic loads on nonlinear responses existed differences.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

View full text Add to dashboard Cite

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.

show abstract

Section: Loading Waysmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

show abstract

“…Hence, further research and validation were needed. Sha et al [26][27][28][29] extensively researched the response and fatigue failure occurring in aeronautical thin-walled structures under high temperatures and intense noise excitations. They carried out numerical simulations and experimental validations of models (e.g., single thin-walled plates) under various coupled loads.…”

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

View full text Add to dashboard Cite

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.

show abstract

“…The sonic loads on aircraft are as high as 180dB, while the temperature could reach 3000 o f. Around the initial equilibrium position, large amplitude nonlinear vibration on the pre-buckling structure can be caused by strong acoustic loads, which makes the buckling structure beat severely between different buckling equilibrium position, namely snap-through, or vibrate around a buckling equilibrium position [1][2][3]. In order to achieve high speed, aerospace is designed by reducing its weight, its structural parts are often used of thin-walled structure, such as an airplane wing, skin, etc.…”

Section: Introductionmentioning

confidence: 99%

Response Analysis of thin-walled Structure under Non-uniform temperature field and Acoustic Loads

Yu¹,

X²

2015

Proceedings of the 2015 International Conference on Advances in Mechanical Engineering and Industrial Informatics

View full text Add to dashboard Cite

Abstract. With the raised performance of advanced aircraft, hypersonic vehicles are subjected to increasingly severe environment. Very severe elevated temperature and high intensity acoustic loads will cause the thin-walled structures of aircraft to respond in a strong nonlinear large deflection vibration, and leading to premature fatigue failure of the structure. According to the Von Karman large deflection theory, the large deflection governing equation of plate under thermo-acoustic loadings is obtained. The Galerkin method is employed to obtain the ordinary differential equation under modal coordinates and the stress expressed by modal displacement for the simply-supported plate and the clamped plate. The critical thermal buckling temperatures and modal frequencies of simply-supported plate and thin-walled cylindrical shell under thermal loads with linear temperature gradient, the dynamic responses of them under thermo-acoustic loads, are obtained using finite element numerical stimulation, The thermal-acoustic responses of simply-supported plate and thinwalled cylindrical shell with different combinations of thermal-acoustic loadings are obtained, including the random vibration in pre-buckled regime, snap-through motion between post-buckled equilibrium positions and nonlinear vibration around one post-buckled position.

show abstract

Nonlinear Response and Fatigue Life Prediction of Thin-Walled Structures under Thermo-Acoustic Loadings

Cited by 5 publications

References 7 publications

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

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

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

Response Analysis of thin-walled Structure under Non-uniform temperature field and Acoustic Loads

Contact Info

Product

Resources

About