Wave Propagation in Rotating Functionally Graded Microbeams Reinforced by Graphene Nanoplatelets

Area of Science:

• Mechanical Engineering
• Materials Science
• Nanotechnology

Background:

• Functionally graded materials (FGMs) offer tailored properties by varying composition.
• Graphene nanoplatelets (GPLs) enhance mechanical and thermal properties of composites.
• Microbeams are crucial in micro-electro-mechanical systems (MEMS) and advanced structures.

Purpose of the Study:

• To investigate wave propagation characteristics in rotating FG microbeams reinforced with GPLs.
• To analyze the influence of GPL distribution and microbeam parameters on wave speeds.
• To provide a theoretical framework for designing advanced microbeam structures.

Main Methods:

• Utilized the Halpin-Tsai micromechanics model and rule of mixture for effective material properties.
• Modeled rotating microbeams using Euler-Bernoulli beam theory and nonlocal elasticity theory.
• Conducted a parametric study on factors like rotating speed, GPL distribution, and nonlocal scale.

Main Results:

• Determined the effects of rotating speed, GPL distribution patterns, and nonlocal scale on wave propagation.
• Quantified the impact of GPL aspect ratios (length-to-thickness and length-to-width) on microbeam dynamics.
• Established relationships between structural parameters and wave characteristics (wavenumber, phase speed, group speed).

Conclusions:

• The study provides critical data on wave propagation in GPL-reinforced FG rotating microbeams.
• Findings are essential for optimizing the design of microbeam structures for specific applications.
• This research contributes to the development of high-performance micro-scale devices and systems.