| 马存旺,鲁国富,李光亮.整体复合材料结构分层疲劳全寿命预测方法研究[J].计算力学学报,2013,30(3):455~460 |
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| 整体复合材料结构分层疲劳全寿命预测方法研究 |
| Study on prediction method for delamination fatigue total lives of integrated composite structures |
| 投稿时间：2012-02-16 修订日期：2012-07-14 |
| DOI：10.7511/jslx201303023 |
| 中文关键词: 整体复合材料结构 粘聚区模型 分层疲劳 全寿命预测方法 |
| 英文关键词:integrated composite structures cohesive zone model delamination fatigue prediction method for total lives |
| 基金项目: |
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| 中文摘要: |
| 基于粘聚区模型的观点,认为外载荷作用下整体复合材料结构各元件变形均累积于连接界面,则界面分层扩展可用位移间断δ的演化来表征。以此为基础,建立常幅载荷下分层界面损伤-寿命与应变能释放率-寿命之间的联系,将准静态载荷下的位移间断分为三种情形。提出四个假设,分层疲劳全寿命由基体裂纹形成寿命NM、分层开始寿命ND和分层扩展到一定尺寸寿命NG三部分组成。给出了变幅载荷下界面损伤累积的计算方法和分层疲劳全寿命预测流程。最后,通过两个算例预测常幅和变幅载荷下复合材料分层疲劳全寿命,计算结果与试验结果一致,表明了本文方法的合理性。 |
| 英文摘要: |
| 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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