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Blow-Up of Solutions to the Fourth-Order Equation with Variable-Exponent Nonlinear Weak Damping

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Abstract

In this note, we investigate again the blow-up phenomenon of weak solutions to the following initial-boundary value problem of the fourth-order equation with variable-exponent nonlinearity

$$\begin{aligned} u_{tt}+\Delta ^2 u-M(\Vert \nabla u\Vert _2^2)\Delta u-\Delta u_t+|u_t|^{m(x)-2}u_t=|u|^{p(x)-2}u. \end{aligned}$$

Our investigations reveal that the blow-up phenomenon will happen for arbitrarily high initial energy under \(m^-:=ess\inf _{x\in \Omega }m(x)>2\). It is worthy to point out that an upper bound of the blow-up time is also shown. These results answer the earlier unsolved question in our previous paper (Liao and Tan in Sci China Math 66, 285–302 (2023). https://doi.org/10.1007/s11425-021-1926-x).

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Acknowledgements

The authors would like to express her sincere gratitude to both Professor Wenjie Gao and Bin Guo in Jilin University for their help and constant encouragement. This project is supported by Fundamental Research Funds for the Central Universities (3132022203) and by Basic Scientific Research Project of The Educational Department of Liaoning Province (LJKMZ20220368).

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Menglan Liao and Qingwei Li wrote the main manuscript text. All authors reviewed the manuscript.

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Correspondence to Qingwei Li.

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Liao, M., Li, Q. Blow-Up of Solutions to the Fourth-Order Equation with Variable-Exponent Nonlinear Weak Damping. Mediterr. J. Math. 20, 179 (2023). https://doi.org/10.1007/s00009-023-02391-5

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