Delamination tolerance studies in laminated composite panels

被引:14
|
作者
Singh, KL [1 ]
Dattaguru, B [1 ]
Ramamurthy, TS [1 ]
Mangalgiri, PD [1 ]
机构
[1] Indian Inst Sci, Dept Aerosp Engn, Bangalore 560012, Karnataka, India
来源
SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES | 2000年 / 25卷 / 4期
关键词
delamination; modified virtual crack closure integral; strain energy release rate;
D O I
10.1007/BF03029723
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Determination of levels of tolerance in delaminated composite panels is an important issue in composite structures technology. The primary intention is to analyse delaminated composite panels and estimate Strain Energy Release Rate (SERR) parameters at the delamination front to feed into acceptability criteria. Large deformation analysis is necessary to cater for excessive rotational deformations in the delaminated sublaminate. Modified Virtual Crack Closure Integral (MVCCI) is used to estimate all the three SERR components at the delamination front from the finite element output containing displacements, strains and stresses. The applied loading conditions are particularly critical and compressive loading on the panel could lead to buckling of the delaminated sublaminate and consequent,growth of delamination. Numerical results are presented for circular delamination of various sizes and delamination at various interfaces (varying depth-wise location) between the base- and the sub-laminates. Numerical data are also presented on the effect of hi-axial loading and in particular on compressive loading in both directions. The results can be used to estimate delamination tolerance at various depths (or at various interfaces) in the laminate.
引用
收藏
页码:409 / 422
页数:14
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