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This paper presents a Bezier triangle meshing method that considers both clipped and non-clipped forms for a single NURBS surface. The proposed method is applied to analyze isogeometric Kirchhoff-Love shell structures. The process begins by interpolating NURBS surfaces into Bezier surfaces. Subsequently, the topological relationship between the clipping curve and each parameter node is calculated within the parameter domain. A Bezier contour curve set is then generated in the parameter domain by selecting points along the clipping curve. Utilizing this contour curve set, a triangular mesh is generated in the parameter domain. Finally, the Bezier triangle mesh in the physical domain is created through a mapping method. The adaptability and robustness of the algorithm are verified through three models, and the mesh quality is assessed. The results demonstrate favorable overall mesh quality. Building upon this foundation, the paper illustrates the application of a rotation constraint between Kirchhoff-Love shell elements, using the penalty function method with Scordelis-Lo's Roof shell model as an example. The accuracy of Kirchhoff-Love shell elements based on Bezier triangles is subsequently validated.
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针对单张NURBS曲面提出了一套考虑裁剪与非裁剪形式的Bézier三角形网格划分方法,并将其应用于等几何Kirchhoff-Love壳结构的分析中。首先,将NURBS曲面插值为Bézier曲面;其次,在参数域内计算裁剪曲线与各个参数节点的拓扑关系,并在裁剪曲线上取点,生成参数域内的Bézier轮廓曲线集合;基于该轮廓曲线集合,生成参数域上的三角形网格;最后,采用映射法生成物理域上的Bézier三角网格。通过三个模型验证了算法的适应性与鲁棒性,并计算了网格质量,结果表明整体网格质量良好;在此基础上,以Scordelis-Lo's Roof壳模型为例,采用罚函数法施加Kirchhoff-Love壳单元间的转动约束,验证了基于Bézier三角形的Kirchhoff-Love壳单元的精度。
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1.Key Laboratory of Strength and Structural Integrity, China Aircraft Strength Research Institute, Xi'an 710065, China
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1.中国飞机强度研究所 强度与结构完整性重点实验室,西安 710065
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Sorting of the intersection points between trimming curves and knot lines in array A2, figureFileSmall=VsYRn6u1QqoRFMcyPUDbpQ==, figureFileBig=npa5PsFriwEBhHKfa1usoQ==, tableContent=null), ArticleFig(id=1243226227868283549, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226194494205993, language=CN, label=图1, caption=
数组中裁剪点排序前后存储位置的变化, figureFileSmall=VsYRn6u1QqoRFMcyPUDbpQ==, figureFileBig=npa5PsFriwEBhHKfa1usoQ==, tableContent=null), ArticleFig(id=1243226228702950063, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226194494205993, language=EN, label=Fig. 2, caption=
Treatment of trimmed element boundary, figureFileSmall=xOgm7JMe9iDgg1x1kWsQhA==, figureFileBig=2cOoJmc+nXw87Wewd1tDJA==, tableContent=null), ArticleFig(id=1243226229109797557, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226194494205993, language=CN, label=图2, caption=
裁剪单元边界处理, figureFileSmall=xOgm7JMe9iDgg1x1kWsQhA==, figureFileBig=2cOoJmc+nXw87Wewd1tDJA==, tableContent=null), ArticleFig(id=1243226229432758969, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226194494205993, language=EN, label=Fig. 3, caption=
NURBS representation of a half cylindrical shell with one hole, figureFileSmall=lr0uzhgFcl0n2Z1+lYC1/Q==, figureFileBig=ZiYxFCAEyTZQKb2Ns8KGeA==, tableContent=null), ArticleFig(id=1243226229722165952, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226194494205993, language=CN, label=图3, caption=
开孔半圆柱壳的NURBS表示, figureFileSmall=lr0uzhgFcl0n2Z1+lYC1/Q==, figureFileBig=ZiYxFCAEyTZQKb2Ns8KGeA==, tableContent=null), ArticleFig(id=1243226230166762184, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226194494205993, language=EN, label=Fig. 4, caption=
A half cylindrical shell with a hole problem: The triangular mesh in the physical space, figureFileSmall=3qu8btvOQ5XB/26+Yreb1A==, figureFileBig=b6c4+1heWyXb5rKfT/n/8w==, tableContent=null), ArticleFig(id=1243226230460363471, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226194494205993, language=CN, label=图4, caption=
开孔半圆柱壳的物理域三角网格, figureFileSmall=3qu8btvOQ5XB/26+Yreb1A==, figureFileBig=b6c4+1heWyXb5rKfT/n/8w==, tableContent=null), ArticleFig(id=1243226231018205912, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226194494205993, language=EN, label=Fig. 5, caption=
Triangular mesh in the physical space of cylindrical shell with multiple holes, figureFileSmall=Q8nIlef1MirDZ7ZAx3aKew==, figureFileBig=c1BCfSatAMNGCfvTADaeRQ==, tableContent=null), ArticleFig(id=1243226231332778720, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226194494205993, language=CN, label=图5, caption=
多孔半圆柱壳的物理域三角网格, figureFileSmall=Q8nIlef1MirDZ7ZAx3aKew==, figureFileBig=c1BCfSatAMNGCfvTADaeRQ==, tableContent=null), ArticleFig(id=1243226231827706601, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226194494205993, language=EN, label=Fig. 6, caption=
Triangular mesh of the frustum surface, figureFileSmall=SksOnj/2LVQTBXsRwWkc0w==, figureFileBig=s5UkOqYL+jxAlDN+1uFbzQ==, tableContent=null), ArticleFig(id=1243226232100336367, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226194494205993, language=CN, label=图6, caption=
锥形壳的物理域三角网格, figureFileSmall=SksOnj/2LVQTBXsRwWkc0w==, figureFileBig=s5UkOqYL+jxAlDN+1uFbzQ==, tableContent=null), ArticleFig(id=1243226232414909171, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226194494205993, language=EN, label=Fig. 7, caption=
Triangular mesh of the Frustum surface: A reference[16], figureFileSmall=S59CcUwPCens5dEOk9rAow==, figureFileBig=7NJHTXd1Tt8ji+UL4LrijQ==, tableContent=null), ArticleFig(id=1243226232901448444, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226194494205993, language=CN, label=图7, caption=
锥形曲面的参考网格[16], figureFileSmall=S59CcUwPCens5dEOk9rAow==, figureFileBig=7NJHTXd1Tt8ji+UL4LrijQ==, tableContent=null), ArticleFig(id=1243226233283130111, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226194494205993, language=EN, label=Fig. 8, caption=
Triangular mesh of the Scordelis-Lo's Roof, figureFileSmall=s/sufdfVVm4lmT+Hu/MhMw==, figureFileBig=GTO/C++k+bOLzT+dm84f0A==, tableContent=null), ArticleFig(id=1243226233627063046, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226194494205993, language=CN, label=图8, caption=
Scordelis-Lo's Roof壳的物理三角网格, figureFileSmall=s/sufdfVVm4lmT+Hu/MhMw==, figureFileBig=GTO/C++k+bOLzT+dm84f0A==, tableContent=null), ArticleFig(id=1243226233929052944, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226194494205993, language=EN, label=Fig. 9, caption=
Contour plots of the z-direction displacement of the Scordelis-Lo's Roof (top view), figureFileSmall=60D0pWpV/XMrwgbH/5KN5g==, figureFileBig=87be0VI6ivCOnGH49oifjw==, tableContent=null), ArticleFig(id=1243226234361066265, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226194494205993, language=CN, label=图9, caption=
Scordelis-Lo's Roof壳在Z方向的位移云图(俯视图), figureFileSmall=60D0pWpV/XMrwgbH/5KN5g==, figureFileBig=87be0VI6ivCOnGH49oifjw==, tableContent=null), ArticleFig(id=1243226234818245408, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226194494205993, language=EN, label=Fig. 10, caption=
Bending force M12 of Scordelis-Lo's Roof shell (this Paper), figureFileSmall=N2yOPE4RtbMzAyQa3V4Y+Q==, figureFileBig=8Nbfz2qDotxdwbAiBHeXlw==, tableContent=null), ArticleFig(id=1243226235296396070, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226194494205993, language=CN, label=图10, caption=
Scordelis-Lo's Roof壳的弯曲力M12(本文), figureFileSmall=N2yOPE4RtbMzAyQa3V4Y+Q==, figureFileBig=8Nbfz2qDotxdwbAiBHeXlw==, tableContent=null), ArticleFig(id=1243226235598385963, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226194494205993, language=EN, label=Fig. 11, caption=
Bending force M12 of Scordelis-Lo's Roof shell (ABAQUS), figureFileSmall=7OQgLIiouVH5srG9CHaQ5w==, figureFileBig=6KOTRUt4OG5R/NdmIHcpug==, tableContent=null), ArticleFig(id=1243226235866821426, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226194494205993, language=CN, label=图11, caption=
Scordelis-Lo's Roof壳的弯曲力M12(ABAQUS), figureFileSmall=7OQgLIiouVH5srG9CHaQ5w==, figureFileBig=6KOTRUt4OG5R/NdmIHcpug==, tableContent=null), ArticleFig(id=1243226236290446135, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226194494205993, language=EN, label=Fig. 12, caption=
Convergence curve of the maximum z-direction displacement of the Scordelis-Lo's Roof with respect to the order of the basis, figureFileSmall=jEyZ7+nzuidhu8zi5IrDjg==, figureFileBig=CXak3zYfUCTZ+2nOSmZ5cg==, tableContent=null), ArticleFig(id=1243226236743430975, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226194494205993, language=CN, label=图12, caption=
Scordelis-Lo's Roof壳Z方向的最大位移随单元次数变化的收敛曲线, figureFileSmall=jEyZ7+nzuidhu8zi5IrDjg==, figureFileBig=CXak3zYfUCTZ+2nOSmZ5cg==, tableContent=null), ArticleFig(id=1243226237146084167, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226194494205993, language=EN, label=Fig. 13, caption=
Displacement convergence curve in the Z direction of Scordelis-Lo's Roof shell, figureFileSmall=8E+8l2ev3nYXnrR1/sqptQ==, figureFileBig=S+4apJRAHt2UT2BT507yZw==, tableContent=null), ArticleFig(id=1243226237527765837, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226194494205993, language=CN, label=图13, caption=
Scordelis-Lo's Roof壳Z方向的位移收敛曲线, figureFileSmall=8E+8l2ev3nYXnrR1/sqptQ==, figureFileBig=S+4apJRAHt2UT2BT507yZw==, tableContent=null), ArticleFig(id=1243226237846532951, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226194494205993, language=EN, label=Tab. 2, caption=
Comparison of calculation results of Roof shell in Z-direction maximum displacement
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 本文结果 | 文献[8](Nitsche法) | 文献[10](光顺rTBS法) | ABA QUS |
|---|
| Wmax/mm | -0.302 | -0.301 | -0.308 | -0.386 |
), ArticleFig(id=1243226238043665251, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226194494205993, language=CN, label=表2, caption=
Roof壳结果对比
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 本文结果 | 文献[8](Nitsche法) | 文献[10](光顺rTBS法) | ABA QUS |
|---|
| Wmax/mm | -0.302 | -0.301 | -0.308 | -0.386 |
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