This study presents the ballistic limit velocity of small caliber projectiles against SS400 steel plate derived from live-fire ballistic experiments. Four different small caliber projectiles were tested against SS400 ...This study presents the ballistic limit velocity of small caliber projectiles against SS400 steel plate derived from live-fire ballistic experiments. Four different small caliber projectiles were tested against SS400 steel plates of 9 mm, 10 mm, and 12 mm thicknesses. The ballistic limit velocity was calculated using two standard methods, MIL-STD-662F and NIJ-STD-0101.06, and additionally using a support vector machine algorithm. The results show a linear relationship between the plate thickness and ballistic limit velocity. Further, the relative penetration performance among five different small caliber projectiles was analyzed using the Penetration Performance Ratio(PPR) introduced in this study, which suggests the potential of PPR to predict the ballistic limit velocity of other untested materials and/or different projectiles.展开更多
对郑州市及河南省的一些中小城镇地区880户住宅进行调查统计,得到1770组卧室面积及家电家具重量、材质等数据信息,从中随机抽取50组普通小型住宅卧室(面积小于20 m2),计算出卧室活动火灾荷载,并进行统计分析。结果表明:鉴于住户个人喜...对郑州市及河南省的一些中小城镇地区880户住宅进行调查统计,得到1770组卧室面积及家电家具重量、材质等数据信息,从中随机抽取50组普通小型住宅卧室(面积小于20 m2),计算出卧室活动火灾荷载,并进行统计分析。结果表明:鉴于住户个人喜好和家具材质的不同,普通小型住宅卧室活动火灾荷载密度差异比较大,但一般情况下,小型卧室活动火灾荷载密度服从正态分布。设计计算时,可取典型小卧室活动火灾荷载密度为872.79 M J/m2,该值具有95%的保证率。展开更多
文摘This study presents the ballistic limit velocity of small caliber projectiles against SS400 steel plate derived from live-fire ballistic experiments. Four different small caliber projectiles were tested against SS400 steel plates of 9 mm, 10 mm, and 12 mm thicknesses. The ballistic limit velocity was calculated using two standard methods, MIL-STD-662F and NIJ-STD-0101.06, and additionally using a support vector machine algorithm. The results show a linear relationship between the plate thickness and ballistic limit velocity. Further, the relative penetration performance among five different small caliber projectiles was analyzed using the Penetration Performance Ratio(PPR) introduced in this study, which suggests the potential of PPR to predict the ballistic limit velocity of other untested materials and/or different projectiles.
文摘对郑州市及河南省的一些中小城镇地区880户住宅进行调查统计,得到1770组卧室面积及家电家具重量、材质等数据信息,从中随机抽取50组普通小型住宅卧室(面积小于20 m2),计算出卧室活动火灾荷载,并进行统计分析。结果表明:鉴于住户个人喜好和家具材质的不同,普通小型住宅卧室活动火灾荷载密度差异比较大,但一般情况下,小型卧室活动火灾荷载密度服从正态分布。设计计算时,可取典型小卧室活动火灾荷载密度为872.79 M J/m2,该值具有95%的保证率。
