考慮泊松效應(yīng)的黏彈性軸向功能梯度Timoshenko微梁的尺寸依賴行為(英文)
發(fā)布時間:2021-01-16 05:59
建立了黏彈性功能梯度(FG) Timoshenko微梁的尺寸依賴連續(xù)模型,其材料參數(shù)沿軸向隨冪律變化.為研究微梁的尺寸效應(yīng),利用修正偶應(yīng)力理論和Kelvin-Voigt黏彈性模型將材料的黏性項納入應(yīng)力和偶應(yīng)力張量的偏離分量中;結(jié)合Timoshenko梁理論導出了應(yīng)變、曲率、應(yīng)力和偶應(yīng)力的分量;基于哈密頓原理,給出了任意截面形狀的微梁在任意荷載作用下的控制微分方程和邊界條件.然后,以點荷載作用下的簡支微梁為例,研究了尺寸效應(yīng)、功能梯度效應(yīng)、泊松效應(yīng)以及截面形狀對黏彈性微梁力學行為的影響.結(jié)果表明:當微梁尺寸足夠小時,其轉(zhuǎn)角、正應(yīng)力和偶應(yīng)力的尺寸效應(yīng)明顯;當微梁尺寸足夠大時,微梁的功能梯度效應(yīng)較為明顯;此外,泊松比對尺寸效應(yīng)影響較大,梁截面形狀也是影響微梁力學性能的重要因素.
【文章來源】:Journal of Southeast University(English Edition). 2020,36(02)
【文章頁數(shù)】:11 頁
【文章目錄】:
1 Modelling VAFG Timoshenko Micro-Beam
1.1 MCST descriptions of basic variables
1.2 Governing differential equations and boundary conditions
2 Solutions of VAFG Timoshenko Micro-Beam
2.1 Formula of deflection and rotation angel
2.2 Formula of strain and curvature
2.3 Formula of stress and couple stress
3 Numerical Calculation and Discussion
3.1 Size effects
3.2 Functionally graded effects
3.3 Poisson effects
3.4 Influences of inertia radius
4 Conclusions
本文編號:2980285
【文章來源】:Journal of Southeast University(English Edition). 2020,36(02)
【文章頁數(shù)】:11 頁
【文章目錄】:
1 Modelling VAFG Timoshenko Micro-Beam
1.1 MCST descriptions of basic variables
1.2 Governing differential equations and boundary conditions
2 Solutions of VAFG Timoshenko Micro-Beam
2.1 Formula of deflection and rotation angel
2.2 Formula of strain and curvature
2.3 Formula of stress and couple stress
3 Numerical Calculation and Discussion
3.1 Size effects
3.2 Functionally graded effects
3.3 Poisson effects
3.4 Influences of inertia radius
4 Conclusions
本文編號:2980285
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