Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
|
Structural Engineering and Mechanics Volume 92, Number 2, October25 2024 , pages 163-172 DOI: https://doi.org/10.12989/sem.2024.92.2.163 |
|
|
|
Nonlinear forced vibration of imperfect FG beams with hygro-thermal factor |
||
Y.J. He and G.L She
|
||
| Abstract | ||
| This paper intends to analyze the nonlinear forced vibrations of functionally graded material (FGM) beams with initial geometrical defects in hygro-thermal ambiences. For this purpose, we assume that the correlation properties of the material alter along the thickness direction in succession and the surface of the beam is subjected to humid and thermal loads. Based on the Euler Bernoulli beam theory and geometrical non-linearity, we use the Hamiltonian principle to formulate a theoretical model with consideration of the hygrothermal effects. Galerkin's technique has been proposed for the control equations of discrete systems. The non-linear primary resonances are acquired by applying the modified Lindstedt-Poincare method (MLP). Verify the reliability of the data obtained through comparison with literature. The non-linear resonance response is reflected by amplitude-frequency response curves. The numerical results indicate that the resonances of FGM beams include three non-linear characteristics, namely hard springs, soft springs and soft-hard spring types. The response modalities of the structure may transform between those non-linear characteristics when material properties, spring coefficients, geometric defect values, temperature-humidity loads and even the external stimulus generate variations. | ||
| Key Words | ||
| FGM beam; hygro-thermal loads; initial geometric imperfections; nonlinear forced vibrations | ||
| Address | ||
| Y.J. He and G.L She: College of Mechanical and Vehicle Engineering, Chongqing University, Chongqing 400044, China | ||