Spatial decay estimate for the MGT-Fourier model on a semi-infinite cylinder in R2
Xuejiao Chen , Zijun Cheng
Electronic Research Archive ›› 2026, Vol. 34 ›› Issue (6) : 3696 -3712.
This study investigates the spatial decay estimate for a coupled Moore-Gibson-Thompson (MGT)-Fourier system on a semi-infinite cylinder in R2. The system is comprised of a third-order MGT displacement equation and a parabolic heat equation with symmetric coupling. Using a weighted energy functional and an integral-differential inequality, we establish the exponential decay along the axial direction. This result offers a generalized Saint-Venant principle for coupled dissipative thermoviscoelastic models, thus extending the classical analysis to higher-order systems and advancing our understanding of MGT equations in an unbounded domain.
Saint-Venant principle / MGT-Fourier model / integral-differential inequality / semi-infinite cylinder
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