Akademik Veri Yönetim Sistemi
Mechanical Systems and Signal Processing, cilt.238, 2025 (SCI-Expanded)
Electro-thermo-mechanically loaded GNP-reinforced MEMS offer significant potential for advanced applications in sensing, actuation, and energy harvesting systems, especially when mechanical strength, thermal stability, and electrical conductivity is important for reliable, multi-functional micro-scale devices. This study investigates the nonlinear dynamic response of a fully clamped micro-scale composite beam reinforced with graphene nanoplatelets (GNPs), simultaneously subjected to a uniform temperature increase and an external electric force within a viscous medium. The beam is modeled based on Euler–Bernoulli beam theory, considering a polymer matrix embedded with graphene inclusions to achieve a structure exhibiting excellent tensile strength as well as superior thermal, electrical, and mechanical conductivity. Geometric nonlinearity is accounted for using von Kármán strain theory, while the modified couple stress theory is employed to incorporate size-dependent effects into the governing equations. These nonlinear partial differential equations are reduced to a single-degree-of-freedom system via the Galerkin method and further analyzed using the method of multiple time scales to investigate forced vibrations under both primary and secondary resonance conditions. A comprehensive parametric study is conducted to explore the effects of various parameters, including boundary constraints, material length scale, GNP content and distribution pattern, initial electrode gap, and applied AC/DC voltages on the system's dynamic behavior.