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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 국제구조공학회 Structural Engineering and Mechanics, An Int'l Journal Structural Engineering and Mechanics, An Int'l Journal Vol.65 No.4
- 발행연도
- 2018.1
- 수록면
- 491 - 504 (14page)
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초록· 키워드
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Because of sandwich structures with low weight and high stiffness have much usage in various industries such as civil and aerospace engineering, in this article, buckling and free vibration analyses of coupled micro composite sandwich plates are investigated based on sinusoidal shear deformation (SSDT) and most general strain gradient theories (MGSGT). It is assumed that the sandwich structure rested on an orthotropic elastic foundation and make of four composite face sheets with temperature-dependent material properties that they reinforced by carbon and boron nitride nanotubes and two flexible transversely orthotropic cores. Mathematical formulation is presented using Hamilton’s principle and governing equations of motions are derived based on energy approach and applying variation method for simply supported edges under electro-magneto-thermo-mechanical, axial buckling and pre-stresses loadings. In order to predict the effects of various parameters such as material length scale parameter, length to width ratio, length to thickness ratio, thickness of face sheets to core thickness ratio, nanotubes volume fraction, pre-stress load and orthotropic elastic medium on the natural frequencies and critical buckling load of double-bonded micro composite sandwich plates. It is found that orthotropic elastic medium has a special role on the system stability and increasing Winkler and Pasternak constants lead to enhance the natural frequency and critical buckling load of micro plates, while decrease natural frequency and critical buckling load with increasing temperature changes. Also, it is showed that pre-stresses due to help the axial buckling load causes that delay the buckling phenomenon. Moreover, it is concluded that the sandwich structures with orthotropic cores have high stiffness, but because they are not economical, thus it is necessary the sandwich plates reinforce by carbon or boron nitride nanotubes specially, because these nanotubes have important thermal and mechanical properties in comparison of the other reinforcement.
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참고문헌 (52)
참고문헌 신청
Akbari Alashti, R. / 2012 / Three-dimensional dynamo-thermo-elastic analysis of a functionally graded cylindrical shell with piezoelectric layers by DQ-FD coupled / J. Pre.Vessel. Pip. 96:49~67
Ansari, R. / 2015 / Small-scale Timoshenko beam element / Eur. J. Mech. A/Sol. 53:19~33
Ansari, R. / 2013 / Size-dependent bending, buckling and free vibration of functionally graded Timoshenko micro beams based on the most general strain gradient theory / Compos. Struct. 100:385~397
Araujo, A.L. / 2010 / Finite element model for hybrid active-passive damping analysis of anisotropic laminated sandwich structures / J. Sandw. Struct. Mater. 12:397~419
Bahaadini, R. / 2017 / Nonlocal and surface effects on the flutter instability of cantilevered nanotubes conveying fluid subjected to follower forces / Phys. B 509:55~61
Ansari, R. / 2015 / Small-scale Timoshenko beam element / Eur. J. Mech. A/Sol. 53:19~33
Ansari, R. / 2013 / Size-dependent bending, buckling and free vibration of functionally graded Timoshenko micro beams based on the most general strain gradient theory / Compos. Struct. 100:385~397
Araujo, A.L. / 2010 / Finite element model for hybrid active-passive damping analysis of anisotropic laminated sandwich structures / J. Sandw. Struct. Mater. 12:397~419
Bahaadini, R. / 2017 / Nonlocal and surface effects on the flutter instability of cantilevered nanotubes conveying fluid subjected to follower forces / Phys. B 509:55~61
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