Pub Date : 2019-12-02DOI: 10.12783/ballistics2019/33093
Yong Jin, Zhenxiao Li, Y. Ni, Xiaoya Gao, G. Wan, Chun-xia Yang, Baoming Li
{"title":"Design and Manufacture of a 100kA Coaxial Pulsed Power Cable for Plasma Generator and PPS in ETC Guns","authors":"Yong Jin, Zhenxiao Li, Y. Ni, Xiaoya Gao, G. Wan, Chun-xia Yang, Baoming Li","doi":"10.12783/ballistics2019/33093","DOIUrl":"https://doi.org/10.12783/ballistics2019/33093","url":null,"abstract":"","PeriodicalId":211120,"journal":{"name":"31st International Symposium on Ballistics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123109778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-02DOI: 10.12783/ballistics2019/33209
Luo Yuchuan, Huang Zhengui, Chen Zhihua, Hou Yu, Zeqing Guo
In order to study the influence of the head cone angle and velocity of truncated cone-shaped projectiles on the cavitation and trajectory characteristics under the condition of low-speed oblique entry into water, based on the high-speed camera method, the comparative experiments of different truncated cone-shaped projectiles at low-speed oblique entry into water were carried out, and the effects of the head cone angle and velocity of truncated cone-shaped projectiles on the entry cavitation, movement speed and pitch angle were obtained. The experimental results show that the smaller the cone angle of the truncated cone projectile's head, the earlier the tail collides with the lower wall of the bubble. The smaller the head cone angle is, the faster the initial velocity is, and the later the time of deep closure of the cavitation is. The cavitation of the projectile increases with the decrease of the head cone angle and the increase of the velocity. Velocity and head cone angle have influence on the stability of water inflow. When the velocity of projectile is lower than the critical value, it tends to increase, and when it is higher than the critical value, it tends to decrease.
{"title":"Experimental Study on the Effect of Head Cone Angle on the Low Velocity Oblique Inlet Process of Projectile","authors":"Luo Yuchuan, Huang Zhengui, Chen Zhihua, Hou Yu, Zeqing Guo","doi":"10.12783/ballistics2019/33209","DOIUrl":"https://doi.org/10.12783/ballistics2019/33209","url":null,"abstract":"In order to study the influence of the head cone angle and velocity of truncated cone-shaped projectiles on the cavitation and trajectory characteristics under the condition of low-speed oblique entry into water, based on the high-speed camera method, the comparative experiments of different truncated cone-shaped projectiles at low-speed oblique entry into water were carried out, and the effects of the head cone angle and velocity of truncated cone-shaped projectiles on the entry cavitation, movement speed and pitch angle were obtained. The experimental results show that the smaller the cone angle of the truncated cone projectile's head, the earlier the tail collides with the lower wall of the bubble. The smaller the head cone angle is, the faster the initial velocity is, and the later the time of deep closure of the cavitation is. The cavitation of the projectile increases with the decrease of the head cone angle and the increase of the velocity. Velocity and head cone angle have influence on the stability of water inflow. When the velocity of projectile is lower than the critical value, it tends to increase, and when it is higher than the critical value, it tends to decrease.","PeriodicalId":211120,"journal":{"name":"31st International Symposium on Ballistics","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129570668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-02DOI: 10.12783/ballistics2019/33154
Hou Yu, Huang Zhengui, Chen Zhihua, Zeqing Guo, Luo Yuchuan
Based on the volume of fluid (VOF) multiphase flow equations, the k-e turbulent model and sliding mesh technique, the low speed vertical water-entry of a hollow cylinder was investigated numerically. The numerical results have a good agreement with corresponding experimental results and finer mesh independence. The results show that a jet flow induced by the through-hole provides a new connection between the inner and outer flow at the pinch-off time underwater. Furthermore, a little bubble on the top of the through-hole jet is created by the collision of the edge surface of the water column inside the cylinder. The initial water-entry speed has a significant influence on the inner cavity formation, the pinch-off depth, the through-hole jet ejection and the motion parameter during the vertical water-entry process.
{"title":"Numerical Investigation on the Vertical Water-Entry of a Hollow Cylinder at Low Velocity","authors":"Hou Yu, Huang Zhengui, Chen Zhihua, Zeqing Guo, Luo Yuchuan","doi":"10.12783/ballistics2019/33154","DOIUrl":"https://doi.org/10.12783/ballistics2019/33154","url":null,"abstract":"Based on the volume of fluid (VOF) multiphase flow equations, the k-e turbulent model and sliding mesh technique, the low speed vertical water-entry of a hollow cylinder was investigated numerically. The numerical results have a good agreement with corresponding experimental results and finer mesh independence. The results show that a jet flow induced by the through-hole provides a new connection between the inner and outer flow at the pinch-off time underwater. Furthermore, a little bubble on the top of the through-hole jet is created by the collision of the edge surface of the water column inside the cylinder. The initial water-entry speed has a significant influence on the inner cavity formation, the pinch-off depth, the through-hole jet ejection and the motion parameter during the vertical water-entry process.","PeriodicalId":211120,"journal":{"name":"31st International Symposium on Ballistics","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127057235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-02DOI: 10.12783/ballistics2019/33055
Y. Ni, Yong Jin, G. Wan, Baoming Li
{"title":"Numerical Simulation on the Pressure Wave in a 30MM Electrothermal-Chemical Gun with the Discharge Rod Plasma Generator","authors":"Y. Ni, Yong Jin, G. Wan, Baoming Li","doi":"10.12783/ballistics2019/33055","DOIUrl":"https://doi.org/10.12783/ballistics2019/33055","url":null,"abstract":"","PeriodicalId":211120,"journal":{"name":"31st International Symposium on Ballistics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129259878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-02DOI: 10.12783/ballistics2019/33215
B. Mishra, B. Ramakrishna, K. Kumar, V. Madhu
Various materials are being subjected to high strain rate loading conditions when in use such as penetrator or armour. Armco Fe, Pure Mg, Ultra high strength martensitic steels are some of the widely used material. However, limited study exists on understanding effect of crystal structure, strain rate and temperature dependent deformation behavior of these materials. In the current study, we explore the strain rate and crystal structure dependent change in deformation mechanism of these materials. Pure Mg and Fe were subjected to compression at a strain rate of 0.01- 4000/s. The effect of strain rate, initial microstructure and texture on twin induced grain re-orientation, slip and twin-slip interaction is studied. An approach to derive a physics based model to depict microstructure based phenomenon is discussed. The effect of strain rate on flow behaviour and fracture in Ultra High Strength martensitic steels along with adiabatic shear band formation is also explored.
{"title":"High Strain Rate Deformation Behavior of Materials: Effect of Crystal Structure, Grain Size, Microstructure and Texture","authors":"B. Mishra, B. Ramakrishna, K. Kumar, V. Madhu","doi":"10.12783/ballistics2019/33215","DOIUrl":"https://doi.org/10.12783/ballistics2019/33215","url":null,"abstract":"Various materials are being subjected to high strain rate loading conditions when in use such as penetrator or armour. Armco Fe, Pure Mg, Ultra high strength martensitic steels are some of the widely used material. However, limited study exists on understanding effect of crystal structure, strain rate and temperature dependent deformation behavior of these materials. In the current study, we explore the strain rate and crystal structure dependent change in deformation mechanism of these materials. Pure Mg and Fe were subjected to compression at a strain rate of 0.01- 4000/s. The effect of strain rate, initial microstructure and texture on twin induced grain re-orientation, slip and twin-slip interaction is studied. An approach to derive a physics based model to depict microstructure based phenomenon is discussed. The effect of strain rate on flow behaviour and fracture in Ultra High Strength martensitic steels along with adiabatic shear band formation is also explored.","PeriodicalId":211120,"journal":{"name":"31st International Symposium on Ballistics","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134373389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-11-08DOI: 10.12783/ballistics2019/33030
Hui Tian, Gu Jinliang, Yong Jin, Yan Xia, G. Wan, Baoming Li
Because the X-ray can penetrate the flame and smoke in the railgun's muzzle to detect the armature situation, an X-ray digital imaging system is assembled for railgun muzzle diagnostics, which consists of Scandiflash 300kV flash X-ray system, PROSCAN 35 X-ray computer radiography (CR) imaging system and image processing software. The flash Xray system provides short and intense pulses of X-ray. The image plates are placed behind the armature, perpendicular to the x-ray beam axis. The X-ray digital imaging system can take 4 time sequence images of 1.4m within the muzzle of projectile. Observing these images, the experimental information about the trajectory, attitude and appearance of the armature can be obtained. And some important ballistic parameters, such as muzzle velocity and the ablation condition of armature also can be obtained via analyzing these images. The parameters can provide reliable experimental parameters for the mechanism of electromagnetic launch and designing the railgun launcher.
{"title":"Application of Flash X-Ray Radiography System in Muzzle Image Diagnosis of Railgun","authors":"Hui Tian, Gu Jinliang, Yong Jin, Yan Xia, G. Wan, Baoming Li","doi":"10.12783/ballistics2019/33030","DOIUrl":"https://doi.org/10.12783/ballistics2019/33030","url":null,"abstract":"Because the X-ray can penetrate the flame and smoke in the railgun's muzzle to detect the armature situation, an X-ray digital imaging system is assembled for railgun muzzle diagnostics, which consists of Scandiflash 300kV flash X-ray system, PROSCAN 35 X-ray computer radiography (CR) imaging system and image processing software. The flash Xray system provides short and intense pulses of X-ray. The image plates are placed behind the armature, perpendicular to the x-ray beam axis. The X-ray digital imaging system can take 4 time sequence images of 1.4m within the muzzle of projectile. Observing these images, the experimental information about the trajectory, attitude and appearance of the armature can be obtained. And some important ballistic parameters, such as muzzle velocity and the ablation condition of armature also can be obtained via analyzing these images. The parameters can provide reliable experimental parameters for the mechanism of electromagnetic launch and designing the railgun launcher.","PeriodicalId":211120,"journal":{"name":"31st International Symposium on Ballistics","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125952761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-12-18DOI: 10.12783/BALLISTICS2017/16970
Shawn Klann, S. Chocron, A. Carpenter, N. Scott
Military vehicle armor panels are traditionally mounted through the use of bolts. A proper understanding of bolt loading conditions and failure is necessary to produce an optimal attachment design. Bolt failure during a ballistic event could lead to vehicle vulnerabilities. Tank-Automotive Research, Development, and Engineering Center (TARDEC) and Southwest Research Institute (SwRI) performed a study quantify the forces in the bolts and understand the failure mechanisms of bolts. This was successfully achieved using instrumented bolts and various tensile tests. The results will be used to develop design guidance for vehicle integrators. This paper summarizes the testing that occurred and the results of the effort.
{"title":"An Investigation of Armor Bolt Failure Due to Ballistic Events","authors":"Shawn Klann, S. Chocron, A. Carpenter, N. Scott","doi":"10.12783/BALLISTICS2017/16970","DOIUrl":"https://doi.org/10.12783/BALLISTICS2017/16970","url":null,"abstract":"Military vehicle armor panels are traditionally mounted through the use of bolts. A proper understanding of bolt loading conditions and failure is necessary to produce an optimal attachment design. Bolt failure during a ballistic event could lead to vehicle vulnerabilities. Tank-Automotive Research, Development, and Engineering Center (TARDEC) and Southwest Research Institute (SwRI) performed a study quantify the forces in the bolts and understand the failure mechanisms of bolts. This was successfully achieved using instrumented bolts and various tensile tests. The results will be used to develop design guidance for vehicle integrators. This paper summarizes the testing that occurred and the results of the effort.","PeriodicalId":211120,"journal":{"name":"31st International Symposium on Ballistics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130974628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-10-31DOI: 10.12783/DTCSE/AIEA2017/15048
Yongjie Cao, W. Yue, Zhifei Li, Jing Hu, Xuesong Li, Mingchen Su, Rufeng Han
In order to improve the muzzle velocity of the cased telescoped ammunition (CTA) with a certain caliber, a kind of charge structure with the shear form when engraving the grooves of the CTA was designed, a theoretical interior ballistic model was established and the optimization design plan was proposed. Results show that the interior ballistic model can generally describe the interior ballistic characteristics of the CTA, the calculated results agree well with the experimental ones. On the basis, by optimizing the charge structure parameters of the CTA using the multi-objective particle swarm optimization algorithm, the muzzle velocity of the projectile is improved by 2.58% with the maximum chamber pressure unchanged. The study can provide reference for the interior ballistic modeling and the charge structure of the CTA.
{"title":"Interior Ballistic Modeling and Charge Structure Optimization of Cased Telescoped Ammunition","authors":"Yongjie Cao, W. Yue, Zhifei Li, Jing Hu, Xuesong Li, Mingchen Su, Rufeng Han","doi":"10.12783/DTCSE/AIEA2017/15048","DOIUrl":"https://doi.org/10.12783/DTCSE/AIEA2017/15048","url":null,"abstract":"In order to improve the muzzle velocity of the cased telescoped ammunition (CTA) with a certain caliber, a kind of charge structure with the shear form when engraving the grooves of the CTA was designed, a theoretical interior ballistic model was established and the optimization design plan was proposed. Results show that the interior ballistic model can generally describe the interior ballistic characteristics of the CTA, the calculated results agree well with the experimental ones. On the basis, by optimizing the charge structure parameters of the CTA using the multi-objective particle swarm optimization algorithm, the muzzle velocity of the projectile is improved by 2.58% with the maximum chamber pressure unchanged. The study can provide reference for the interior ballistic modeling and the charge structure of the CTA.","PeriodicalId":211120,"journal":{"name":"31st International Symposium on Ballistics","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132243840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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