Failure analysis of plain woven SiC/SiC perforated plate-metal pin connection structure considering delamination damage
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摘要:
为探究陶瓷基复合材料(CMC)机械连接结构在航空发动机中的应用潜力,采用试验与数值模拟相结合的方法研究了平纹编织SiC/SiC带孔板-金属销钉连接结构在拉伸状态下的失效模式与破坏过程,并通过数字图像相关(DIC)技术实时观测试件变形与失效过程。试验结果表明:结合分层损伤的剪切破坏是连接结构主要的失效形式。基于内聚力模型(CZM),使用渐进损伤分析方法(PDA)预测了平纹编织SiC/SiC带孔板的失效载荷、失效模式及分层损伤,预测结果与试验结果吻合,失效载荷预测误差小于10%,表明了数值模型对结构失效分析的有效性。
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关键词:
- 平纹编织SiC/SiC /
- 连接结构 /
- 内聚力模型 /
- 渐进损伤分析 /
- 分层损伤
Abstract:To explore the application potential of ceramic matrix composite (CMC) mechanical connection structure in aero-engine, the failure mode and failure process of plain woven SiC/SiC perforated plate-metal pin connection structure under tension state were studied by combining test and numerical simulation. The deformation and failure process of the test specimens in real-time were observed through digital image correlation (DIC) technology. The main failure mode of the connected structure arising from the shear failure combined with delamination damage was revealed by test results. Based on the cohesive zone model (CZM), the failure load, failure mode and delamination damage of the plain woven SiC/SiC perforated plate were predicted by using the progressive damage analysis method (PDA). Good consistency between the numerical failure predictions and the test results was obtained, and the failure load prediction error was less than 10%, indicating the validity of the numerical model for the failure analysis of connection structure.
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参数 数值 参数 数值 (E1= E2)/GPa 227.40 (Xt= Yt)/MPa 224.98 E3/GPa 50.00 (Xc= Yc)/MPa 603.66 G12/GPa 91.00 S12/MPa 176.19 (G13= G23)/GPa 17.70 (S13=S23)/MPa 40.02 ${\nu _{12}}$ 0.15 ${\nu _{13}} = {\nu _{23}}$ 0.25 模型 参数 数值 Mode Ⅰ 强度极限${\sigma _{{\text{max}}}}/{\mathrm{MPa}}$ 15 临界断裂能GⅠc/(J/m2) 400 Mode Ⅱ 剪切强度极限${\tau _{{\text{max}}}}/{\mathrm{MPa}}$ 40 临界断裂能GⅡc/(J/m2) 500 表 4 突降退化模型参数
Table 4. Paramaters of sudden degradation model
失效模式 材料参数退化规则 经纱方向拉伸/压缩 $\left[ {{E_1},{G_{12}},{G_{13}},{\nu _{12}},{\nu _{13}}} \right] \times 0.2$ 纬纱方向拉伸/压缩 $\left[ {{E_2},{G_{12}},{G_{23}},{\nu _{12}},{\nu _{23}}} \right] \times 0.2$ 层间拉伸/压缩 $\left[ {{E_3},{G_{13}},{G_{23}},{\nu _{13}},{\nu _{23}}} \right] \times 0.2$ 表 5 试验与仿真结构的载荷峰值比较
Table 5. Comparison of peak load results between test and simulation
载荷峰值/N 模拟结果峰值/N 误差/% 试件1 试件2 平均值 CZM 模拟 Bonded模拟 平均值 CZM模拟 Bonded模拟 4025.26 3718.72 3872.00 3 757.99 4723.90 3872.00 −2.94 22.00 -
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