横向非均匀温度场作用的FGM夹层圆板热屈曲分析

龚雪蓓; 赵伟东; 郭冬梅

doi:10.21656/1000-0887.430094

横向非均匀温度场作用的FGM夹层圆板热屈曲分析

doi: 10.21656/1000-0887.430094

龚雪蓓^{1, 2,},
赵伟东^{1, 2, ,},
郭冬梅^{1, 2}

1.
青海大学土木工程学院，西宁 810016
2.
青海省建筑节能材料与工程安全重点实验室，西宁 810016

基金项目:

国家自然科学基金项目 52168053

详细信息

作者简介:
龚雪蓓(1999—)，女，硕士生(E-mail: 754928145@qq.com)

通讯作者:
赵伟东(1972—)，男，副教授，硕士，硕士生导师(通讯作者. E-mail: zhwd.xbl@163.com)

中图分类号: TU43
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- 被引次数: 0
出版历程
- 收稿日期: 2022-03-21
- 修回日期: 2022-05-05
- 刊出日期: 2023-04-01

Thermal Buckling Analysis of FGM Sandwich Circular Plates Under Transverse Nonuniform Temperature Field Actions

GONG Xuebei^{1, 2
,},
ZHAO Weidong^{1, 2
, ,},
GUO Dongmei^{1, 2}

1.
School of Civil Engineering, Qinghai University, Xining 810016, P.R.China
2.
Qinghai Provincial Key Laboratory of Energy-Saving Building Materials and Engineering Safety, Xining 810016, P.R.China

摘要

摘要: 基于von Kármán几何非线性板理论，导出了受横向非均匀温度场作用的幂律型功能梯度材料(FGM)夹层圆板的位移型几何非线性控制方程. 考虑不可移夹紧边界条件，通过求解线性特征值问题，得到了系统的有量纲临界屈曲温度差解析公式. 另外，运用打靶法计算了非线性常微分方程两点边值问题. 考察了几何参数、组分材料特性、梯度指数、温度场参数和层厚比对FGM夹层圆板的临界屈曲温度差、热过屈曲平衡路径和平衡构形的影响. 当厚径比、梯度层相对厚度和梯度指数增加时，FGM夹层圆板临界屈曲温度差均单调增加；当半径和总厚度给定时，随FGM层相对厚度增加，FGM夹层圆板后屈曲变形显著减小.
- 功能梯度材料 /
- 夹层圆板 /
- 非均匀温度场 /
- 热屈曲 /
- 打靶法
Abstract: Based on the von Kármán geometric nonlinear plate theory, the displacement-type geometric nonlinear governing equations for FGM sandwich circular plates under transverse nonlinear temperature field actions were derived. With the immovable clamped boundary condition, the analytical formula for dimensional critical buckling temperature differences of the system was obtained from the solution of the linear eigenvalue problem. Moreover, the 2-point boundary value problem of ordinary differential equations was solved with the shooting method. The effects of geometric parameters, constituent material properties, gradient indexes, temperature field parameters and layer-thickness ratios on the critical buckling temperature differences, the thermal postbuckling equilibrium paths, and the buckling equilibrium configurations of FGM sandwich circular plates, were investigated. The results show that, with the increases of the thickness-radius ratio, the relative thickness of the FGM layer and the gradient index, the FGM sandwich circular plate's critical buckling temperature difference will increase monotonically. Given a fixed radius and a fixed total thickness, the postbuckling deformation of the FGM sandwich circular plate will decrease significantly with the relative thickness of the FGM layer.
- FGM /
- sandwich circular plate /
- nonuniform temperature field /
- thermal buckling /
- shooting method

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图 1 FGM夹层圆板的几何和坐标系

Figure 1. Geometry and the coordinate system of FGM sandwich circular plates

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图 2 不同的温度级数项数目对应的FGM夹层圆板热屈曲平衡路径

Figure 2. Thermal buckling equilibrium paths of FGM sandwich circular plates corresponding to different numbers of temperature series terms

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图 3 厚径比对FGM夹层圆板的热过屈曲平衡路径的影响

Figure 3. Effects of thickness-radius ratios on thermal postbuckling equilibrium paths of FGM sandwich circular plates

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图 4 梯度指数对FGM夹层圆板的热过屈曲平衡路径的影响

Figure 4. Effects of gradient indexes on thermal postbuckling equilibrium paths of FGM sandwich circular plates

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图 5 层厚比对FGM夹层圆板的热过屈曲平衡路径的影响

Figure 5. Effects of the layer-thickness ratios on thermal postbuckling equilibrium paths of FGM sandwich circular plates

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图 6 不同厚度下FGM夹层圆板的热过屈曲平衡构形

Figure 6. Thermal postbuckling equilibrium configurations of FGM sandwich circular plates with different thicknesses

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图 7 不同层厚比的FGM夹层圆板的热过屈曲平衡构形

Figure 7. Thermal postbuckling equilibrium configurations of FGM sandwich circular plates with different layer-thickness ratios

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图 8 不同梯度指数的FGM夹层圆板的热过屈曲平衡构形

Figure 8. Thermal postbuckling equilibrium configurations of FGM sandwich circular plates with different gradient indices

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表 1 金属和陶瓷组分的材料特性

Table 1. Material properties of metal and ceramic

material property	aluminum(Al)	ceramic(Al₂O₃)
elastic modulus E/GPa	70	380
thermal expansion coefficient α/℃^-1	2.3×10^-5	7.4×10^-6
thermal conductivity K/(W/mK)	204	10.4
Poisson’s ratio μ	0.3	0.3

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表 2 具有不同厚径比和梯度指数的FGM圆板在T_l=0 ℃时对应的临界屈曲温度差ΔT_cr

Table 2. Critical buckling temperature difference ΔT_cr of FGM circular plates with different thickness-radius ratios and gradient indexes for T_l=0 ℃

k		h/a
k		0.05	0.04	0.03	0.02	0.01
0	solution in ref. [24]	635.828	405.821	228.898	101.590	25.433
0	present solution	636.000	407.040	228.960	101.760	25.440
0.5	solution in ref. [24]	475.230	304.146	171.083	76.037	19.009
0.5	present solution	475.061	304.039	171.021	76.009	19.002
1	solution in ref. [24]	384.600	246.153	138.456	61.536	15.384
1	present solution	384.453	246.050	138.433	61.512	15.378

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