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| 1 | 考虑成形方向的航空铝合金修正本构模型的构建显示文摘为了能够准确地反映材料成形方向对其动态力学性能的影响,利用电子万能试验机及分离式霍普金森压杆(SHPB)装置,对航空铝合金7050-T7451板材沿不同成形方向(法向ND,横向TD,轧向RD)取样,并进行准静态加载试验和动态冲击剪切试验。结果表明:成形方向是影响材料准静态和动态力学性能的重要因素之一,在动态冲击剪切过程中,铝合金7050-T7451表现出一定的应变率敏感性和正应变率强化效应。基于材料的成形方向影响规律,构建包含应变率敏感函数项的修正的Johnson-Cook本构模型,并对比验证修正模型与试验数据的结果,证明了修正的、包含应变率函数项的材料本构模型更适用于描述不同成形方向下的材料动态力学性能,该模型能够为建立精确可靠的各向异性材料仿真模型提供数据支持。 | 孟莹 付秀丽 潘永智 徐念伟 | 2018 | 机械工程学报2018，54，22： | 8 |
| 2 | 喷射沉积Al-7Si-0.5Cu-0.5Mg热变形行为研究显示文摘亚共晶铝硅合金因具有轻质、耐腐蚀、高的比强度和优异力学性能等优点,被广泛应用于航空、航天、军事及汽车工业领域。利用喷射沉积技术制备亚共晶Al-7Si-0.5Cu-0.5Mg合金,通过高温压缩试验结合微观组织分析,研究温度和应变速率对沉积态亚共晶铝硅合金热变形行为的影响规律,最终确定沉积态合金优化的致密化工艺参数。研究发现,采用双曲线正弦函数建立的沉积态合金的本构方程,能够准确描述沉积态合金的流变行为。喷射沉积合金主要由Al相、Si相、Al2Cu相和Mg2Si相组成,硅相平均尺寸为8.5μm。当温度为300℃,随着应变速率由1s-1减小至0.001s-1,合金的压缩应力由112.19 MPa减小至61.26 MPa。在应变速率为0.001s-1下,随着变形温度由300℃升高至450℃,合金压缩流变应力由61.26 MPa减小至21.35 MPa。合金在低应变速率(0.001s-1)和相对较高的温度(450℃)下变形时,由于相对充足的变形时间和铝基体较高的软化程度,导致组织中硅相尺寸增大,不利于合金性能的提高。沉积态合金最佳的变形参数为变形温度400℃,应变速率0.01s-1。 | 郑惠锦 彭云 阎璐 朱若凡 | 2018 | 机械工程学报2018，54，14： | 2 |
| 3 | Safety Assessment of Aircraft Fuel Tank Access Cover under the Impact Load by Tire Fragments显示文摘According to relevant airworthiness standards, the aircraft fuel tank access cover must withstand the impact by tire fragments, and minimize the penetration and deformation, which is critical for flight safety. To assess the safety of an aircraft fuel tank access cover subjected to tire fragments, a study of dynamic response was presented in this paper using the Finite element(FE) software ANSYS/LS-DYNA. To obtain the reliable mechanical characteristics of tire tread rubber, a series of material tests have been conducted. Then the proposed rubber material model is validated by comparing the numerical simulations with the experimental results of aluminium alloy plate impact. The simulation results indicate that the rubber fragment and alloy plate will undergo the largest deformation when impact angle is equal to 90°. Finally, the proposed FE model and modelling approaches are extended to the numerical simulation of a full-scale aircraft fuel tank access cover impact. The numerical simulations are carried out with impact velocity of 71.1 m/s and impact angle of 40.5°. The simulation results indicate that the aluminium alloy by precision casting is more likely to rupture, and the middle region of the access cover is vulnerable to fragment impact. This research proposes a reliable rubber model applying to various strain rates. Considering the influence of impact regions, the dynamic response and various failure patterns of fuel tank access cover are acquired. The findings of this paper can be used to improve the future aircraft safety design. | Shile Yao Zhufeng Yue Xiaoliang Geng Peiyan Wang | 2019 | Chinese Journal of Mechanical Engineering2019，32，1： | 1 |
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