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Impact Characteristics and Fatigue Life Analysis of Multi-Wire Recoil Spring for Guns
Shock and Vibration ( IF 1.6 ) Pub Date : 2020-11-16 , DOI: 10.1155/2020/8853707 Zhifang Wei 1 , Xiaolian Zhang 2 , Yecang Hu 3 , Yangyang Cheng 1
Shock and Vibration ( IF 1.6 ) Pub Date : 2020-11-16 , DOI: 10.1155/2020/8853707 Zhifang Wei 1 , Xiaolian Zhang 2 , Yecang Hu 3 , Yangyang Cheng 1
Affiliation
Recoil spring is a key part in automatic or semi-automatic weapons re-entry mechanism. Because the stranded wire helical spring (SWHS) has longer fatigue life than an ordinary single-wire cylindrically helical spring, it is often used as a recoil spring in various weapons. Due to the lack of in-depth research on the dynamic characteristics of the current multi-wire recoil spring in recoil and re-entry processes, the fatigue life analysis of the current multi-wire recoil spring usually only considers uniform loading and does not consider dynamic impact loads, which cannot meet modern design requirements. Therefore, this paper proposes a research method for fatigue life prediction analysis of multi-wire recoil spring. Firstly, based on the secondary development of UG, a three-wire recoil spring parameterized model for a gun is established. Secondly, ABAQUS is used to carry out a finite element analysis of its dynamic response characteristics under impact, and experimental verification is performed. Then, based on the stress-time history curve of the dangerous position obtained by finite element analysis, the rain flow counting method is used to obtain the fatigue stress spectrum of recoil spring. Finally, according to the Miner fatigue cumulative damage theory, the fatigue life prediction of the recoil spring based on the S-N curve of the material is compared with experimental results. The research results show that the recoil spring has obvious transient characteristics during the impact of the bolt carrier. The impact velocity is far greater than the propagation speed of the stress wave in the recoil spring, which easily causes the spring coils to squeeze each other. The maximum stress occurs at the fixed end of the spring. And the mean fatigue curve (50% survival rate) is used to predict the life of the recoil spring. The calculation result is 8.6% different from the experiment value, which proves that the method has certain reliability.
中文翻译:
枪用多线后坐力弹簧的冲击特性和疲劳寿命分析
反冲弹簧是自动或半自动武器重入机制中的关键部分。由于绞线螺旋弹簧(SWHS)的疲劳寿命比普通的单线圆筒形螺旋弹簧更长,因此经常在各种武器中用作反冲弹簧。由于缺乏对当前多线后坐力弹簧在反冲和再入过程中的动力学特性的深入研究,因此对当前多线后坐力弹簧的疲劳寿命分析通常只考虑均匀载荷而不考虑动态冲击载荷,不能满足现代设计要求。因此,本文提出了一种多线后坐弹簧疲劳寿命预测分析的研究方法。首先,基于UG的二次开发,建立了枪的三线后坐弹簧参数化模型。其次,ABAQUS用于对其在冲击下的动态响应特性进行有限元分析,并进行实验验证。然后,根据有限元分析得到的危险位置的应力-时间历史曲线,采用雨流计数法获得反冲弹簧的疲劳应力谱。最后,根据Miner疲劳累积损伤理论,将基于材料SN曲线的反冲弹簧疲劳寿命预测与实验结果进行了比较。研究结果表明,反冲弹簧在螺栓支架撞击过程中具有明显的过渡特性。冲击速度远大于反冲弹簧中应力波的传播速度,这很容易导致弹簧线圈相互挤压。最大应力发生在弹簧的固定端。平均疲劳曲线(50%生存率)用于预测反冲弹簧的寿命。计算结果与实验值相差8.6%,说明该方法具有一定的可靠性。
更新日期:2020-11-16
中文翻译:
枪用多线后坐力弹簧的冲击特性和疲劳寿命分析
反冲弹簧是自动或半自动武器重入机制中的关键部分。由于绞线螺旋弹簧(SWHS)的疲劳寿命比普通的单线圆筒形螺旋弹簧更长,因此经常在各种武器中用作反冲弹簧。由于缺乏对当前多线后坐力弹簧在反冲和再入过程中的动力学特性的深入研究,因此对当前多线后坐力弹簧的疲劳寿命分析通常只考虑均匀载荷而不考虑动态冲击载荷,不能满足现代设计要求。因此,本文提出了一种多线后坐弹簧疲劳寿命预测分析的研究方法。首先,基于UG的二次开发,建立了枪的三线后坐弹簧参数化模型。其次,ABAQUS用于对其在冲击下的动态响应特性进行有限元分析,并进行实验验证。然后,根据有限元分析得到的危险位置的应力-时间历史曲线,采用雨流计数法获得反冲弹簧的疲劳应力谱。最后,根据Miner疲劳累积损伤理论,将基于材料SN曲线的反冲弹簧疲劳寿命预测与实验结果进行了比较。研究结果表明,反冲弹簧在螺栓支架撞击过程中具有明显的过渡特性。冲击速度远大于反冲弹簧中应力波的传播速度,这很容易导致弹簧线圈相互挤压。最大应力发生在弹簧的固定端。平均疲劳曲线(50%生存率)用于预测反冲弹簧的寿命。计算结果与实验值相差8.6%,说明该方法具有一定的可靠性。