Effects of ply angle and blocking on open-hole tensile strength of composite laminates: A design and certification perspective
Effects of ply angle and blocking on open-hole tensile strength of composite laminates: A design and certification perspective
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DOI：
10.1016/j.compositesb.2020.108582
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发表时间：
2021-02-15
影响因子：
13.1
通讯作者：
Rhead, A. T.
中科院分区：
文献类型：
--
作者：
Chuaqui, T. R. C.;Nielsen, M. W. D.;Rhead, A. T.
碳纤维增强复合材料层合板在开孔拉伸下的破坏强度随铺层角度、铺层阻塞和载荷方向的变化而变化。在这里，层压板与各种标准角度和非标准角度的堆叠顺序进行全面的实验和渐进损伤有限元分析测试活动中的轴上和轴外载荷。据发现，层间和intralaminar矩阵损伤时，积累亚临界层块对齐加载方向是有益的，但也可能导致显着的强度下降，由于边缘故障。在这种情况下，数值边缘处理提出了更准确地表示开孔拉伸强度在大型结构中的孔定位远离自由边缘。该解决方案可抑制边缘失效，并使强度提高高达80%，这对标准开孔拉伸测试和当前设计规则在某些应用中的有效性提出了挑战。
The failure strength of carbon-fibre reinforced plastic laminates under open-hole tension varies considerably with ply angle, ply blocking and loading direction. Here, laminates with various standard-angle and nonstandard angle stacking sequences are subjected to both on- and off-axis loading in a comprehensive experimental and progressive damage finite element analysis testing campaign. It is found that interlaminar and intralaminar matrix damage can be beneficial when accumulated sub-critically in ply blocks aligned with loading direction, but can also lead to significant strength decreases owing to edge failure. In such cases, a numerical edge treatment is proposed for more accurate representation of open-hole tensile strength in large structures where holes are positioned away from free edges. The solution suppresses edge failure and results in up to 80% strength increases, challenging the validity of standard open-hole tension testing and current design rules for some applications.