Primary resonance of an Euler-Bernoulli nano-beam modelled with second strain gradient

سال انتشار: 1398
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 329

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شناسه ملی سند علمی:

JR_TAVA-5-1_005

تاریخ نمایه سازی: 27 آذر 1398

چکیده مقاله:

In the present manuscript, the second strain gradient (SSG) is utilized to investigate the primary resonance of a nonlinear Euler-Bernoulli nanobeam is analyzed in this paper for the first time. To that end, the second strain gradient theory, a higher-order continuum theory capable of taking the size effects into account, is utilized and the governing equation of the motion for an Euler-Bernoulli nanobeam is derived with sixteen higher-order material constants. Then by implementing the Galerkin’s method,the Duffing equation for the vibration of a hinged-hinged nanobeam is obtained and its primary resonance is studied utilizing the method of multiple scales. The size effects and impact of various system parameters on the amplitude of the response are then investigated for three different materials and the results are compared to thatof the first strain gradient and classical theories. The results of this manuscript clearly shows that the nonlinear vibration of a second strain gradient nanobeam is size-dependent and although the difference between the results obtained by the second strain gradient theory and the first strain gradient theory is negligible for thicker beams, as the thickness decreases, the difference becomes more prominent. Also, the effects of nonlinearity on the forced vibration nonlinear response of an SSG beam are investigated and some observations are reported.

کلیدواژه ها:

Second Strain Gradient Theory ، Nonlinear vibration ، Euler-Bernoulli Beam ، Method of Mul-tiple Scales

نویسندگان

Hossein Mohammadi

Assistant Professor, School of Mechanical Engineering, Shiraz University, Shiraz, Islamic Republic of Iran

Soroush Sepehri

Phd. student, School of Mechanical Engineering, Tehran University, Tehran, Islamic Republic of Iran

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