NONLINEAR CONSTITUTIVE MODEL FOR 2D-C/SiC COMPOSITES AT ELEVATED TEMPERATURES
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摘要:高温各向异性非线性本构关系对陶瓷基复合材料热结构设计具有重要科学和工程意义. 为了分析预测2D-C/SiC复合材料在高温平面应力下的应力−应变行为, 基于损伤解耦表征方法, 考虑材料的损伤耦合效应、非线性和正交各向异性, 建立了热力耦合损伤本构模型的理论框架. 基于应变分割法, 考虑热失配应力、基体开裂、界面脱黏、纤维桥连对卸载模量和残余应变的影响, 给出了材料的轴向拉伸和面内剪切应力−应变关系分析模型, 并进行了初步试验验证. 在材料基本性能表征的基础上, 对2D-C/SiC复合材料在不同偏轴角度(15°, 30°和45°)和不同环境温度(27 °C, 973 °C, 1273 °C和1473 °C)下的拉伸应力−应变行为进行了模拟预测. 结果表明, 2D-C/SiC复合材料的应变响应具有显著的温度相关性, 随着温度的升高材料的非线性程度降低, 而随着偏轴角度的增大材料的非线性增强, 不同偏轴角度下材料的表观模量均随着温度的升高有增大趋势; 所建立的理论模型可对2D-C/SiC复合材料的应力−应变行为进行合理预测, 模拟曲线与试验值具有较好一致性.Abstract:High-temperature anisotropic nonlinear constitutive relationship is of great scientific and engineering significance for thermal structure design of ceramic matrix composites. In order to analyze and predict the stress-strain behavior of 2D-C/SiC composites under plane stress state at elevated temperatures, a thermal-mechanical coupled damage constitutive model was developed based on the damage decoupling characterization method, considering the damage coupling effect and material nonlinearity and orthotropy. Meanwhile, by application of the strain segmentation method, and taking into consideration of the effects of thermal mismatch stress, matrix cracking, interface debonding and fiber bridging on the unloading modulus and residual strain, the analytical models of on-axis tension and in-plane shear stress-strain relationships of the material were presented, and preliminary experimental validation were performed. On the basis of basic property characterization, the tensile stress-strain behavior of 2D-C/SiC composites under different off-axis angles, i.e., 15°, 30° and 45°, and at elevated ambient temperatures (27 °C, 973 °C, 1273 °C and 1473 °C) were simulated and predicted. The results show that the strain response of 2D-C/SiC composites depends significantly on environmental temperature. The degree of material nonlinearity decreases with the increase of temperature, while it increases with the increase of off-axis angle. Meanwhile, the apparent modulus of the material tends to increase with the increase of temperature at different off-axis angles. Besides, the developed theoretical model can reasonably predict the stress-strain behavior of 2D-C/SiC composites, and the simulated curves are in good agreement with the experimental data.
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表 1材料和模型参数
Table 1.Parameters of material and model
Parameter Value fabrication temperatureTP/°C 1000[8,35] thickness of half layerh/μm 100[8] initial matrix crack spacing ${{L} }_{0}$/μm 1000[10] ultimate matrix crack spacing ${{L} }_{\mathrm{u} }$/μm 150[10,22] modulus of SiC matrix ${ {E} }_{{\rm{m}}}$/GPa 350[5,9,22] Poisson ratio of SiC matrixνm 0.2[9,10,35] CTE of matrix $ {\alpha }_{\mathrm{m}} $/$ {\mathrm{K}}^{-1} $ 4.6 × 10−6[5] radius of carbon fiberRf/μm 3.5[5,10] Poisson ratio of carbon fiberν23f 0.4[9] Poisson ratio of carbon fiberν13f 0.2[10] Poisson ratio of carbon fiberν12f 0.2[10] axial CTE of fiber $ {\alpha }_{\mathrm{f}1} $/$ {\mathrm{K}}^{-1} $ 0[5] transverse CTE of fiber $ {\alpha }_{\mathrm{f}2} $/$ {\mathrm{K}}^{-1} $ 8.8 × 10−6[20] shear modulus of fiberG12f/ GPa 15[36] shear modulus of fiberG13f/ GPa 15[36] axial modulus of fiber ${{E} }_{\mathrm{f}1}$/GPa 230[5,10] transverse modulus of fiber ${{E} }_{\mathrm{f}2}$/GPa 15[30,36] reference cracking stress $ {\sigma }_{\mathrm{R}} $/MPa 45 (identified) minimum cracking stress $ {\sigma }^{*} $/MPa 130[10] matrix cracking exponent $ n $ 3.1[10] friction-like scale coefficient $ \mu $ 0.15 (identified) modification coefficient $\eta _{1}$ 65% (identified) interface debond energy ${ { \varGamma } }_{\mathrm{i} }$/(J·m−2) 0.1[35] scaling factor $\eta _{2}$ 10% (identified) -
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