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为了研究剪切应力对长期舰载立式贮存固体发动机装药粘接界面的影响,利用自制的粘接试件开展了界面剪切应力强度试验和疲劳损伤试验,得到了立式贮存发动机的剪切应力疲劳损伤分析模型;通过有限元计算,得到了不同海况下发动机装药粘接界面的剪切应力分布与变化规律;基于雨流计数法和Miner线性疲劳损伤理论,计算了立式贮存发动机在某海区连续舰载值班一年的界面累积损伤。结果表明:同一海况下发动机粘接界面剪切应力在周向位置基本为均匀分布,在垂向位置越靠近发动机尾部应力越大;舰载值班时的界面剪切应力变化幅值不超过3k Pa,远低于该发动机界面最大剪切应力强度值,但剪切应力的交变特性对发动机造成的累积损伤影响较大,在给定舰载条件下发动机在某海区连续值班一年对使用寿命的影响至少为15.4%。
In order to study the influence of shear stress on the loading and bonding interface of long-term shipborne solid storage solid engine, the interfacial shear stress tests and fatigue damage tests were carried out by self-made bonded specimens. The shear force of vertical storage engine The fatigue damage analysis model of shear stress was established. The distribution and variation of shear stress at the interface of engine charging and bonding under different sea conditions were obtained by finite element calculation. Based on the rain flow counting method and the Miner linear fatigue damage theory, the vertical storage engine In a sea area continuous ship-based one year accumulated damage on the interface. The results show that under the same sea condition, the shear stress at the bonding interface of the engine is basically uniform in the circumferential direction, and the stress in the vertical position is closer to the tail of the engine. The change of the interfacial shear stress at the time of shipborne service does not exceed 3kPa , Which is much lower than the maximum shear stress intensity at the interface of the engine. However, the alternating characteristics of shear stress greatly affect the cumulative damage caused by the engine. Under a given carrier-borne condition, The impact is at least 15.4%.