The graded density impactor(GDI)dynamic loading technique is crucial for acquiring the dynamic physical property parameters of materials used in weapons.The accuracy and timeliness of GDI structural design are key to ...The graded density impactor(GDI)dynamic loading technique is crucial for acquiring the dynamic physical property parameters of materials used in weapons.The accuracy and timeliness of GDI structural design are key to achieving controllable stress-strain rate loading.In this study,we have,for the first time,combined one-dimensional fluid computational software with machine learning methods.We first elucidated the mechanisms by which GDI structures control stress and strain rates.Subsequently,we constructed a machine learning model to create a structure-property response surface.The results show that altering the loading velocity and interlayer thickness has a pronounced regulatory effect on stress and strain rates.In contrast,the impedance distribution index and target thickness have less significant effects on stress regulation,although there is a matching relationship between target thickness and interlayer thickness.Compared with traditional design methods,the machine learning approach offers a10^(4)—10^(5)times increase in efficiency and the potential to achieve a global optimum,holding promise for guiding the design of GDI.展开更多
随着武器装备技术的不断进步,装甲结构的轻质化与抗侵彻能力日益成为研究的重点。在等面密度和总厚度不变条件下,对不同厚度配比的铝合金/UHMWPE复合装甲板抗侵彻性能进行了仿真分析,以复合板结构面密度吸能作为抗侵彻性能指标,深入研...随着武器装备技术的不断进步,装甲结构的轻质化与抗侵彻能力日益成为研究的重点。在等面密度和总厚度不变条件下,对不同厚度配比的铝合金/UHMWPE复合装甲板抗侵彻性能进行了仿真分析,以复合板结构面密度吸能作为抗侵彻性能指标,深入研究了复合装甲板结构轻量化与防护性能之间的平衡关系。研究结果表明:在等面密度条件下,复合板的面密度吸能随着UHMWPE层合板厚度的增加呈现先快速提升后逐渐趋于平缓的趋势,通过综合考虑复合板结构总厚度影响,确定6 mm Al/10.8 mm UHMWPE复合结构抗侵彻性最优;对于具有相同厚度的复合板,当铝合金与UHMWPE的厚度配比为1∶4时,其面密度吸能达到最大值,为92.9 J/(kg·m^(2))。研究结果可为复合装甲结构的厚度匹配优化设计提供参考。展开更多
When the protective and protected systems are detached,the former can be allowed to absorb the kinetic energy of the impacting projectile through large deformation without considering the back face signature of the la...When the protective and protected systems are detached,the former can be allowed to absorb the kinetic energy of the impacting projectile through large deformation without considering the back face signature of the latter.This paper presents a novel double-face knitted fabric(DFKF)designed for this very impacting scenario.Shooting tests equipped with high-speed camera were used to characterize the ballistic performance with the impact velocities ranging from 100 m/s to 450 m/s.The results showed that the ballistic limits(V_(bl))of DFKF are approximately triple and double that of its counterpart UD and plain fabrics,respectively.For mass-normalized metrics,the specific energy absorption(SEA)is 250%and 350%greater than the UD and plain fabrics at their corresponding V_(bl)s.The quasi-static tests showed that the DFKF displayed greater resilience,crease recovery properties,and flexibility,which also made it an especially better candidate than UD and plain weaves for the design of umbrella surface cloth.It was also found that DFKF is dependent on yarn count and the incorporation of spandex.A prototype anti-ballistic umbrella is manufactured using DFKF made of 200D multi-filament yarn.The ballistic performance is also sensitive to the impact site when the umbrella is subjected to impact.展开更多
基金supported by the Guangdong Major Project of Basic and Applied Basic Research(Grant No.2021B0301030001)the National Key Research and Development Program of China(Grant No.2021YFB3802300)the Foundation of National Key Laboratory of Shock Wave and Detonation Physics(Grant No.JCKYS2022212004)。
文摘The graded density impactor(GDI)dynamic loading technique is crucial for acquiring the dynamic physical property parameters of materials used in weapons.The accuracy and timeliness of GDI structural design are key to achieving controllable stress-strain rate loading.In this study,we have,for the first time,combined one-dimensional fluid computational software with machine learning methods.We first elucidated the mechanisms by which GDI structures control stress and strain rates.Subsequently,we constructed a machine learning model to create a structure-property response surface.The results show that altering the loading velocity and interlayer thickness has a pronounced regulatory effect on stress and strain rates.In contrast,the impedance distribution index and target thickness have less significant effects on stress regulation,although there is a matching relationship between target thickness and interlayer thickness.Compared with traditional design methods,the machine learning approach offers a10^(4)—10^(5)times increase in efficiency and the potential to achieve a global optimum,holding promise for guiding the design of GDI.
文摘随着武器装备技术的不断进步,装甲结构的轻质化与抗侵彻能力日益成为研究的重点。在等面密度和总厚度不变条件下,对不同厚度配比的铝合金/UHMWPE复合装甲板抗侵彻性能进行了仿真分析,以复合板结构面密度吸能作为抗侵彻性能指标,深入研究了复合装甲板结构轻量化与防护性能之间的平衡关系。研究结果表明:在等面密度条件下,复合板的面密度吸能随着UHMWPE层合板厚度的增加呈现先快速提升后逐渐趋于平缓的趋势,通过综合考虑复合板结构总厚度影响,确定6 mm Al/10.8 mm UHMWPE复合结构抗侵彻性最优;对于具有相同厚度的复合板,当铝合金与UHMWPE的厚度配比为1∶4时,其面密度吸能达到最大值,为92.9 J/(kg·m^(2))。研究结果可为复合装甲结构的厚度匹配优化设计提供参考。
基金support from the following for aspects of the research,authorship,and/or publication of this article:National Natural Science Foundation of China(Grant No.12302187)Innovation Program of Wuhan-Shuguang Project(Grant No.202201080102).
文摘When the protective and protected systems are detached,the former can be allowed to absorb the kinetic energy of the impacting projectile through large deformation without considering the back face signature of the latter.This paper presents a novel double-face knitted fabric(DFKF)designed for this very impacting scenario.Shooting tests equipped with high-speed camera were used to characterize the ballistic performance with the impact velocities ranging from 100 m/s to 450 m/s.The results showed that the ballistic limits(V_(bl))of DFKF are approximately triple and double that of its counterpart UD and plain fabrics,respectively.For mass-normalized metrics,the specific energy absorption(SEA)is 250%and 350%greater than the UD and plain fabrics at their corresponding V_(bl)s.The quasi-static tests showed that the DFKF displayed greater resilience,crease recovery properties,and flexibility,which also made it an especially better candidate than UD and plain weaves for the design of umbrella surface cloth.It was also found that DFKF is dependent on yarn count and the incorporation of spandex.A prototype anti-ballistic umbrella is manufactured using DFKF made of 200D multi-filament yarn.The ballistic performance is also sensitive to the impact site when the umbrella is subjected to impact.
