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| Study on prediction method for delamination fatigue total lives of integrated composite structures |
| Received:February 16, 2012 Revised:July 14, 2012 |
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| DOI：10.7511/jslx201303023 |
| KeyWord:integrated composite structures cohesive zone model delamination fatigue prediction method for total lives |
| Author | Institution |
| 马存旺 |
中国航天空气动力技术研究院, 北京 |
| 鲁国富 |
中航工业特种飞行器研究所, 荆门 |
| 李光亮 |
中国航天空气动力技术研究院, 北京 |
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| Abstract: |
| Based on cohesive zone finite element,the elements deformations in integrated composite structures are accumulated in these interface layers,subsequently the interface delamination growth is characterized by displacement jump δ. According to this view,the relationship between damage-life and strain energy release rate-life is established,and the displacement jumps are divided into three conditions under quasi-static loads.Based on the four hypotheses,it is proposed that the fatigue total lives of the delamination consists mainly of matrix crack initiation life,the lives for delamination onset from this matrix crack and the lives for stable delamination growth to a finite acceptable delamination size.The computational method for interface damage cumulative and prediction programs for delamination fatigue total lives are proposed.Finally,delamination fatigue total lives are predicted under constant-amplitude and variable-amplitude fatigue loadings through two examples,the computational values are consistent well with experimental data,which confirms the validity of this method in this paper. |
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