The effect of drilling-induced delamination on tensile strength and prediction of residual strength of carbon fiber-reinforced polymer laminate
The effect of drilling-induced delamination on tensile strength and prediction of residual strength of carbon fiber-reinforced polymer laminate
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DOI：
10.1177/0021998315620292
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发表时间：
2016-04
影响因子：
2.9
通讯作者：
C. Tao;J. Qiu;W. Yao;H. Ji
中科院分区：
文献类型：
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作者：
C. Tao;J. Qiu;W. Yao;H. Ji
采用基于能量的连续损伤力学模型，研究了钻井脱层对碳纤维增强聚合物层合板抗拉强度的影响，并对残余强度进行了预测。采用有限元法对分层引起的拉伸强度下降进行了详细的研究。通过实验验证了数值计算结果。采用超声c扫描技术对钻孔引起的分层进行了测量，并在有限元模型中建立了相应内聚元素的缺失模型。研究了不同尺寸的分层带，并将预测强度与实验结果进行了比较。有限元模型分析表明，强度降低的主要原因是外层的早期破坏。数值模拟结果与实验结果吻合良好。
An energy-based continuum damage mechanics model was employed to investigate the effect of drilling-induced delamination on tensile strength of carbon fiber-reinforced polymer laminates and the residual strength was predicted. The decrease in tensile strength caused by delamination was investigated in detail by a finite element method (FEM) model. Experiments were also conducted to validate the numerical results. The drilling-induced delamination was measured with ultrasonic C-scan technique and modeled as deletions of corresponding cohesive elements in the FEM model. Different sizes of delamination zones were investigated and the predicted strengths were compared with experimental results. The FEM model showed that the decrease in strength is mainly caused by early failures of outer plies. Good correlation between numerical simulations and experimental results was also obtained.