中文摘要：

实际工程装备中，含有多个薄弱部位的零部件应用广泛，而多个薄弱部位的存在会大大降低零部件的可靠性。以典型多薄弱部位零部件为研究背景，分别从多个薄弱部位的载荷相关性等方面进行详细的理论分析，研究多个薄弱部位之间的失效相关性。在此基础上，应用最小次序统计量模型建立同构多薄弱部位零部件的可靠性模型，并深入研究多薄弱部位零部件的强度以及载荷的分散性对多薄弱部位零部件可靠性的影响规律。结果表明，多薄弱部位零部件的失效规律与仅含有单个薄弱部位的零部件不同，不仅安全裕量影响零部件的可靠度，载荷粗糙度对于多薄弱部位零部件可靠性也有重要影响。所建模型对于含有多个薄弱部位的零部件的设计和可靠性评估具有指导意义。

英文摘要：

In practical engineering, parts with multiple weak sites are widely used; these sites can significantly decrease the reliability of the parts. Typical such parts are taken as research background, detailed theoretical analysis is carried out on aspects such as the load dependence of multiple weak sites in order to research the failure correlations among these sites. On this basis, minimum sequence statistics model is used to build the reliability model of isostructural multiple weak site parts, and the influences of strength decentrality and load decentrality on the reliability of multiple weak site parts are researched in depth. The results show that the failure law of a part with multiple weak sites is different from that of a part with only one weak site. Not only the safety margin has influence on the reliability of the part, the load roughness also has important influence on the part with multiple weak sites. The built model has guiding significance to the design and reliability assessment of parts with multiple weak sites.