中文摘要：

多孔多裂纹紧固件传载结构的安全问题是当今航空界中广泛关注的问题之一。文中通过采用销钉和平板间接触的有限元方法,建立含单裂纹单孔、含单裂纹的串联双孔、含双裂纹的串联双孔、含四裂纹的串联双孔、含双裂纹的并联双孔和含四裂纹的并联双孔紧固件传载结构等六种计算模型,对计算模型的裂纹尖端应力强度因子进行计算。通过大量计算,给出典型的串联多孔多裂纹连接结构和并联多孔多裂纹连接结构应力强度因子计算结果曲线,分析其相互影响规律和原因,计算结果和结论可以作为该类结构损伤容限设计的参考依据。

英文摘要：

The security of load transferring fastener structures with multi-pin-hole and multi-cracks is an important concern in aircraft industry. Finite element method of multi-pin-hole structure with contact between pin and plate structure was considered, and six reliable calculation models with load transfer including single-hole with single-crack, series connection double-holes with single-crack, series connection double-holes with double-cracks, series connection double-holes with four-cracks, parallel connection double-holes with double-cracks and parallel connection double-holes with four-cracks were established. The method for calculating stress intensity factor （SIF） was established and SIFs（ stress intensity factors） were calculated for multi-pin-holes with multi-cracks. Through a large number of calculations, the calculated curves of crack tip SIF for typical series connection and parallel connection multi-pin-hole structures with multi-cracks were provided. The mutual influence on SIFs of multi-pin-hole structures with multi-cracks was discussed. The calculated results can be used as reference for damage tolerance design of this kind of structure.