Surface Buckling and Postbuckling of Composite Laminates with Delaminations

分层复合材料层合板的表面屈曲和后屈曲

• 批准号: 07651125
• 负责人: WANG Wen-Xue
• 金额: $ 1.34万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07651125/
• 关键词: Composite laminates; Delamination; Local laminate asymmetry; Buckling and postbuckling; 3-D nonlinear FEM analysis; デラミネーション; 3次元非線形有限要素法

Increasing demands for high performance and efficiency of various machines and vehicles lead to a series of developments and applications of advanced composite laminates due to their high stiffness, high strength and light weight. Conseuquently, the accurate evaluation of the mechanical behaviors and strength characteristics of composite laminates under various loading conditions becomes crucial. In this research, a finite deformation FEM program is developed based on the updated Lagrangian theory and numerical simulations and associated experiments are conducted to investigate the compressive response of delaminated laminated. Special attention is put on the effects of local asymmetry on the buckling and postbuckling behavior of delaminated laminates and following conclusions are obtained.1.The local asymmetry of delaminated laminates may significantly reduce the global load carrying capacity of the laminate. For instance, the critical averaged compressive stress in the case of this r … More esearch is found to be reduced by nearly 12%.2.The difference between the simple sums of energy release rates obtained from the three and two dimensional analyzes seems to be small. However, the distributions of energy release rates are non-homogeneous along the width direction due to the local asymmetry of the delaminated laminate, which implies that the delamination may not grow homogeneously along this direction.3.The global bucking of the laminate is dominant for short delaminations. in this research, it is found that the critical load of the laminate with short delamination, (delamination length/laminate langth)<0.2, is almost the same with that of a laminate without delamination.4.Nonhomogeneous delamination propagation and twist deformation due to the local asymmetry have been observed in the experimental research, which verifies the prediction of the numerical simulation qualitatively.Further nemerical and experimental researches are still needed to accurately evaluate the damage and strength of delaminated laminates. Less

随着各种机械和车辆对高性能和高效率的要求不断提高，先进复合材料层合板因其高刚度、高强度和轻质等特点而得到了一系列的发展和应用。因此，准确评价复合材料层合板在各种载荷条件下的力学行为和强度特性变得至关重要。本文基于修正的拉格朗日理论，编制了有限变形有限元程序，对含分层损伤层合板的压缩响应进行了数值模拟和实验研究。重点研究了局部非对称性对含脱层层板屈曲和后屈曲行为的影响，得到以下结论：1.含脱层层板的局部非对称性会显著降低其整体承载能力。例如，在这种情况下，临界平均压应力为： ...更多信息 由三维和二维分析得到的能量释放率的简单总和之间的差异似乎很小。但是，由于脱层的局部不对称性，能量释放率沿宽度方向沿着是不均匀的，这意味着脱层可能不会沿该方向沿着均匀扩展。研究发现，短脱层层的临界载荷，（脱层长度/层长）<0.2，与未脱层的层合板的脱层长度基本相同。4.在实验研究中观察到了由于局部不对称性引起的非均匀脱层扩展和扭曲变形。这从定性上验证了数值模拟的预测，但要准确地评估脱层层板的损伤和强度，还需要进一步的数值和实验研究。少

项目成果

汪 文学、高雄 善裕: "デラミネーションを有する複合材料積層板の座屈と座屈後の挙動-局部積層非対称性の影響" 日本航空宇宙学会誌. 第44(発表予定). (1997)

Fukui Wang、Yoshihiro Takao：“复合材料层压板的屈曲和屈曲后行为 - 局部层压板不对称的影响”，日本航空航天学会杂志，第 44 期（即将发表）。

汪文学、高雄善裕: "An Analysis for Cracks Parallel to the Interface of Bimaterial Systems" J.Thermoplastic Composite Materials. Vol.10. 31-50 (1997)

王峰，高尾义弘：“双材料系统界面平行裂纹的分析”，《热塑性复合材料》第 10 卷（1997 年）。

W.X.Wang and Y.Takao: "An Analysis for Cracks Parallel to the Interface of Bimaterial Systems" J.Thermoplastic Composite Materials. Vol.10. 31-50 (1997)

W.X.Wang 和 Y.Takao：“平行于双材料系统界面的裂纹分析”J.热塑性复合材料。

Y.Xiao, W.X.Wang and Y.Takao: "Two-dimensional Contact stress Analysis of Composite laminates with Pinned-joint" Bulletin of Research Institute for Applied Mechanics, Kyushu University. Vol.81. 1-13 (1997)

Y.Xiao、W.X.Wang、Y.Takao：“销接复合材料层合板的二维接触应力分析”九州大学应用力学研究所通报。

汪 文学、高雄 善裕: "An Analysis for Cracks Parallel to the Interface of Bimaterial Systems" Journal of Themoplastic Composite Materials. Vol. 9. 12-22 (1996)

Bungaku Wang，Yoshihiro Takao：“平行于双材料系统界面的裂纹分析”《热塑性复合材料》卷 9. 12-22 (1996)。