1/3含口盖复合材料柱壳后屈曲性能

陈志刚; 吴永康; 程小全; 张涛

doi:10.13700/j.bh.1001-5965.2016.0159

1/3含口盖复合材料柱壳后屈曲性能

doi: 10.13700/j.bh.1001-5965.2016.0159

1.
北京航空航天大学航空科学与工程学院，北京 100083
2.
中国航天科工集团第三研究院第306研究所，北京 100074

详细信息

作者简介:
陈志刚，男，硕士研究生。主要研究方向：复合材料结构稳定性分析

程小全，男，博士，教授，博士生导师。主要研究方向：复合材料结构损伤容限分析与设计技术

通讯作者:
程小全, E-mail:xiaoquan_cheng@buaa.edu.cn

中图分类号: V221⁺.3;TB553
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出版历程
- 收稿日期: 2016-03-04
- 录用日期: 2016-05-20
- 网络出版日期: 2017-03-20

Post-buckling performance of 1/3 composite cylindrical shell with cover

1.
School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
2.
Institute 306 of the 3rd Academy of CASIC, Beijing 100074, China

摘要

摘要:
工程结构中复合材料柱壳已经得到了广泛使用，并且屈曲是其结构设计的一个主要问题。由于试验结果与线性屈曲理论分析结果的巨大偏差，线性特征值屈曲分析只能作为结构的一个初步评估方法，进一步分析可选用含初始几何缺陷的后屈曲分析。本文以轴压载荷下的1/3含口盖复合材料柱壳为研究对象，建立ABAQUS有限元模型，分别进行了基于Buckle算法的线性特征值屈曲分析、基于Riks法的含初始几何缺陷的非线性后屈曲分析，所得应变、载荷数值结果与试验结果吻合。非线性Riks后屈曲分析显示结构具有后屈曲承载能力和稳定的后屈曲平衡路径，能更准确地捕捉临界屈曲载荷，所得屈曲模态也更加贴近试验屈曲模态，因此，在设计上以含初始几何缺陷的Riks法得到的结果更加真实可靠。进行了含口盖复合材料柱壳的初始几何缺陷的敏感性分析，结果表明该结构对初始几何缺陷是非常敏感的，为了提高结构抗屈曲性能，应提高加工工艺质量，减少初始几何缺陷。
- 复合材料 /
- 圆柱壳 /
- 屈曲 /
- 后屈曲 /
- 初始几何缺陷
Abstract:
Composite cylindrical shells are already commonly used in structural engineering, and their buckling is of vital importance in the design of such structures. The linear eigenvalue problem can be used as an initial analysis method due to the huge discrepancies observed between test results and theoretical predictions, and one can choose the geometrically nonlinear analysis for further study. The one-third composite cylindrical shells with cover were chosen as research object loaded in compression, and an ABAQUS finite element model was built at first. A linear eigenvalue analysis based on Buckle algorithm and a geometrically nonlinear post-buckling analysis based on Riks algorithm are developed for this research. The strain and load numerical results were matched well with test results. The Riks analysis shows that the structure has the post-buckling carrying capacity and can also reach a stable nonlinear equilibrium path, grasping the critical buckling load accurately, and the buckling modes are more close to the test ones. Therefore, it is more reliable to take the result based on geometrically nonlinear Riks algorithm as design criteria. A general geometrically imperfection sensitivity analysis is performed. The study shows that the cover shell is sensitive to imperfection, and we should improve the quality of processing and reduce the initial geometric imperfection in order to enhance stable performance.
- composite /
- cylindrical shell /
- buckling /
- post-buckling /
- initial geometric imperfection

HTML全文

图 1 1/3含口盖柱壳实物图

Figure 1. Practicality picture of 1/3 cylindrical shell with cover

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图 2 试验件压缩载荷-端部压缩位移曲线

Figure 2. Compressive load-end shortening displacement curves of specimens

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图 3 试验件C屈曲模态

Figure 3. Buckling mode of specimen C

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图 4 试验件应变布局

Figure 4. Strain gauge layout of specimen

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图 5 1/3柱壳FEM

Figure 5. FEM of 1/3 cylindrical shell

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图 6 Buckle算法所得屈曲模态

Figure 6. Buckling mode obtained by Buckle algorithm

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图 7 试验与Riks法应变-压缩载荷对比

Figure 7. Comparison of strain-compressive load between test and Riks algorithm

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图 8 基于Riks法压缩载荷-端部平均压缩位移曲线

Figure 8. Compressive load-average end shortening displacement curves based on Riks algorithm

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图 9 基于Buckle和Riks法的不同模态变形

Figure 9. Deformed shape of different modes based on Buckle and Riks algorithms

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图 10 初始几何缺陷大小对上临界屈曲载荷影响

Figure 10. Effect of initial geometric imperfection amplitude on up-critical buckling load

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表 1 柱壳铺层复合材料的力学性能

Table 1. Mechanical properties of composite used in cylindrical shell

材料	E₁₁/GPa	E₂₂/GPa	G₁₂/GPa	μ₁₂	t/mm
单向带T300/6808	117	8.00	3.00	0.300	0.160
单向带T300/6808	117	8.00	3.00	0.300	0.125
织物G814/6084	63.0	63.0	4.10	0.060	0.240
注：E₁₁—1方向弹性模量；E₂₂—2方向弹性模量；G₁₂—1-2平面内剪切模量；μ₁₂—泊松比；t—单层厚度。

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表 2 柱壳不同位置的材料及铺层方式

Table 2. Materials and ply sequences of different parts on cylindrical shells

结构	材料	铺层方式	层数
蒙皮	单向带T300/6808 (0.160 mm)	[45/-45/0₂/90]_S	10
纵向筋条	单向带T300/6808 (0.125 mm)	[45/-45/0₂/45/-45/0/90]_S	16
横向筋条	单向带T300/6808 (0.125 mm)	[-45/45/90₂/-45/45/90/0]_S	16
两侧加强筋	单向带T300/6808 (0.125 mm)	[45/-45/0₂/45/-45/0/90₂/0/-45/45/0₂/-45/45₂/-45/0₂/45/-45/0/90₂/0/-45/45/0₂ /-45/45]_S	64
补片	织物G814/6084	[0₁₁]	11
口盖	织物G814/6084	[0₁₁]	11

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