Influence of penetration damage on in-plane compression properties of titanium honeycomb sandwich cover structure
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摘要:
钛合金蜂窝口盖壁板在实际服役过程中可能会产生穿透性损伤，从而影响口盖壁板面内压缩性能。采用试验和有限元计算相结合的方法研究了穿透性损伤对钛合金蜂窝口盖壁板面内压缩性能的影响。结果显示：含穿透性损伤的钛合金蜂窝口盖壁板的面内压缩破坏载荷要略高于无损伤钛合金蜂窝口盖壁板，且面内压缩破坏载荷随穿透性损伤直径增大而增大；有限元模型预测的破坏模式与试验结果一致，预测的破坏载荷与试验结果的最大偏差为9.33%，两者吻合较好。研究结果可以为钛合金蜂窝口盖壁板的设计及面内压缩性能的预测提供数据支持和研究方法参考。
Abstract:During the service period, penetration damage may occur in the titanium honeycomb sandwich cover structure which will affect the in-plane compression properties of the sandwich cover structure. The influence of penetration damage on the in-plane compression properties of titanium honeycomb sandwich cover structure was studied by a combination of experiments and finite element methods. The results show that the in-plane compression failure load of the titanium honeycomb sandwich cover structure with penetration damage is slightly higher than that of the titanium honeycomb sandwich cover structure without damage. Moreover, the in-plane compression failure load increases with the increase of the diameter of penetration damage. The greatest variation is 9.33%, the maximum agreement between the failure load and test results is good, and the failure mode predicted by the finite element model is compatible with the test data.The finite element method can be used for engineering prediction of the in-plane compression properties of titanium honeycomb sandwich cover structure.
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图 4 无损伤和含30 mm，40 mm直径穿透性损伤试验件典型破坏模式
Figure 4. Typical failure modes of specimens with intact 30 mm and 40 mm diameter penetrating damage
图 5 含50 mm直径穿透性损伤试验件典型破坏模式
Figure 5. Typical failure modes of specimens with 50 mm diameter penetrating damage
图 6 无损伤模型网格及有限元分析边界条件
Figure 6. Meshing boundary conditions and loading conditions of finite element simulation model without damage
图 7 无损伤口盖壁板面内压缩破坏模式对比
Figure 7. Comparison of in-plane compression failure modes of structure without damage
图 8 无损伤壁板面内压缩载荷-应变曲线对比
Figure 8. Comparison of in-plane compression load-strain curves of structure without damage
图 9 含穿透性损伤口盖壁板面内压缩破坏模式对比
Figure 9. Comparison of in-plane compression failure modes of structure with penetrating damage
图 10 不同直径穿透性损伤的面内压缩载荷-位移曲线对比
Figure 10. Comparison of in-plane compression load-displacement curves of different penetrating damage
图 11 D30、D50含穿透性损伤壁板于位移1 mm与1.2 mm处变形对比
Figure 11. Deformation comparison of D30 and D50 penetrating damage structure under the displacement of 1 mm and 1.2 mm
图 12 不同直径穿透性损伤的破坏载荷及拟合曲线
Figure 12. Failure load and fitting curves with penetrating damage of different diameters
图 13 钛合金蜂窝口盖壁板面内压缩载荷分布对比
Figure 13. Comparison of in-plane compression load distribution of the titanium honeycomb sandwich cover structure
表 1 钛合金蜂窝口盖壁板面内压缩破坏载荷试验值
Table 1. Experimental compression failure loads of the titanium honeycomb sandwich cover structure
损伤直
径/mm破坏载荷平
均值/kN离散系
数/%面内压缩破坏载
荷降低比例/%0 149.40 7.85 30 140.80 1.86 6.11 40 158.17 11.39 2.33 50 157.53 9.57 −5.54 注：降低比例的负号表示提高。 
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表 2 TC4材料参数
Table 2. Material parameters of TC4
材料 弹性模量/GPa 泊松比 屈服强度/MPa 破坏强度/MPa TC4 108.48 0.30 861.59 967.12
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表 3 TC4应力与塑性应变
Table 3. The true stress and the plastic strain of TC4
应力/MPa 塑性应变/με 830 0 861.7 0.002 960 0.01 1000 0.012
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表 4 钛合金蜂窝口盖壁板破坏载荷对比
Table 4. Comparison of failure loads of the titanium honeycomb sandwich cover structure
损伤直径/mm 破坏载荷 偏差/% 有限元预测值/kN 试验值/kN 0 148.03 149.40 −0.92 30 153.93 140.80 9.33 40 155.07 146.00 6.21 50 157.53 158.17 −5.56
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