舱内爆炸载荷作用下加筋板动态响应试验研究
|
摘要
相对于敞开环境来说,发生在封闭舱室内的爆炸将对舰船结构造成更加严重的毁伤。论文对四边夹持约束的方形加筋板在舱内爆炸载荷作用下的动态响应进行了试验研究,分析加筋板结构的塑性大变形特征和舱室封闭程度对爆炸载荷作用效果的影响。试验结果表明:加筋板在舱内爆炸载荷作用下主要是发生整体塑性变形,中心变形挠度远远大于板厚值,中面膜力在板变形过程中起主要作用。与敞开环境爆炸载荷作用效果相比,舱内爆炸载荷作用在加筋板上的"等效损伤冲量"提高了6~8倍。结构变形主要取决于舱室壁面的反射冲击波和舱内准静态压力载荷。舱壁开孔降低了舱室壁面的封闭限制效果,导致舱内准静态压力载荷衰减速度加大,从而降低了爆炸载荷对结构的破坏能力。
Compared to free air burst, explosion in a confined cabin may result in more severe damage to naval structures. In this paper, dynamic responses of square plates subjected to internal blast loads were investigated. Plastic deformation characteristics of stiffened plates under internal blast loads were presented. Influence of confinement degree of the cabin on the final structural response was investigated. Experimental results show that the stiffened plates exhibited plastic deformations characterized by a uniform global dome with the maximum deflection at the center of the plate, which is much larger than the plate thickness. Membrane behavior dominates dynamic response of square plates subjected to the confined blast loads. Compared to free air burst, equivalent impulse for internal explosion is increased by 6 to 8 times, and structural deformation mainly depends on the quasi-static pressure in the cabin. The venting hole in the cabin decreases confining effect and accelerates the decay of the quasi-static pressure, so that the damage of adjacent structures in the cabin decreases.
Compared to free air burst, explosion in a confined cabin may result in more severe damage to naval structures. In this paper, dynamic responses of square plates subjected to internal blast loads were investigated. Plastic deformation characteristics of stiffened plates under internal blast loads were presented. Influence of confinement degree of the cabin on the final structural response was investigated. Experimental results show that the stiffened plates exhibited plastic deformations characterized by a uniform global dome with the maximum deflection at the center of the plate, which is much larger than the plate thickness. Membrane behavior dominates dynamic response of square plates subjected to the confined blast loads. Compared to free air burst, equivalent impulse for internal explosion is increased by 6 to 8 times, and structural deformation mainly depends on the quasi-static pressure in the cabin. The venting hole in the cabin decreases confining effect and accelerates the decay of the quasi-static pressure, so that the damage of adjacent structures in the cabin decreases.
引文
[1]NURICK G N,MARTIN J B.Deformation of thin plates subjected to impulsive loading—a review:Part II:Experimental studies[J].International Journal of Impact Engineering,1989,8(2):171-186.
[2]NURICK G N,SHAVE G C.The deformation and tearing of thin square plates subjected to impulsive loads—an experimental study[J].International Journal of Impact Engineering,1996,18(1):99-116.
[3]OLSON M D,NURICK G N,FAGNAN J R.Deformation and rupture of blast loaded square plates—predictions and experiments[J].International Journal of Impact Engineering,1993,13(2):279-291.
[4]黄骏德,殷沐德,朱锡,等.爆炸载荷下固支方板大变形的塑性动力响应[J].海军工程学院学报,1985(4):1-9.
[5]王芳,冯顺山,俞为民.爆炸冲击波作用下靶板的塑性大变形响应研究[J].中国安全科学学报,2003,13(3):61-64,84.
[6]NURICK G N,GELMAN M E,MARSHALL N S.Tearing of blast loaded plates with clamped boundary conditions[J].International Journal of Impact Engineering,1996,18(7):803-827.
[7]TEELING-SMITH R G,NURICK G N.The deformation and tearing of thin circular plates subjected to impulsive loads[J].International Journal of Impact Engineering,1991,11(1):77-91.
[8]GUPTA N K,NAGESH.Deformation and tearing of circular plates with varying support conditions under uniform impulsive loads[J].International Journal of Impact Engineering,2007,34:42-59.
[9]WIERZBICKI T,NURICK G N.Large deformation of thin plates under localised impulsive loading[J].International Journal of Impact Engineering,1996,18(7–8):899-918.
[10]JACOB N,NURICK G N,LANGDON G S.The effect of stand-off distance on the failure of fully clamped circular mild steel plates subjected to blast loads[J].Engineering Structures,2007,29(10):2723-2736.
[11]陈长海,朱锡,侯海量,等.近距空爆载荷作用下固支方板的变形及破坏模式[J].爆炸与冲击,2012,32(4):368-375.
[12]CHUNG K Y S,NURICK G N.Experimental and numerical studies on the response of quadrangular stiffened plates.Part I:Subjected to uniform blast load[J].International Journal of Impact Engineering,2005,31:55-83.
[13]LANGDON G S,YUEN S C K,NURICK G N.Experimental and numerical studies on the response of quadrangular stiffened plates.Part II:Localised blast loading[J].International Journal of Impact Engineering,2005,31:85-111.
[14]侯海量,朱锡,李伟,等.舱内爆炸冲击载荷特性实验研究[J].船舶力学,2010,14(8):901-907.
[15]孔祥韶,吴卫国,李俊,等.角隅结构对舱内爆炸载荷影响的实验研究[J].中国造船,2012,53(3):40-50.
[16]GERETTO C,CHUNG K Y S,NURICK G N.An experimental study of the effects of degrees of confinement on the response of square mild steel plates subjected to blast loading[J].International Journal of Impact Engineering,2015,79:32-44.
[17]侯海量,朱锡,梅志远.舱内爆炸载荷及舱室板架结构的失效模式分析[J].爆炸与冲击,2007,27(2):151-158.
[18]李伟,朱锡,梅志远,等.战斗部舱内爆炸对舱室结构毁伤的实验研究[J].舰船科学技术,2009,31(3):34-37.
[19]ZHAO Yapu.Saturated duration of rectangular pressure pulse applied to rectangular plates with finite-deflections[J].Mechanics Research Communications,1997,24(6):659-666.
[20]HENRYCH J,MAJOR R.The dynamics of explosion and its use[M].Elsevier/North-Holland,Inc.,New York,1979.
[2]NURICK G N,SHAVE G C.The deformation and tearing of thin square plates subjected to impulsive loads—an experimental study[J].International Journal of Impact Engineering,1996,18(1):99-116.
[3]OLSON M D,NURICK G N,FAGNAN J R.Deformation and rupture of blast loaded square plates—predictions and experiments[J].International Journal of Impact Engineering,1993,13(2):279-291.
[4]黄骏德,殷沐德,朱锡,等.爆炸载荷下固支方板大变形的塑性动力响应[J].海军工程学院学报,1985(4):1-9.
[5]王芳,冯顺山,俞为民.爆炸冲击波作用下靶板的塑性大变形响应研究[J].中国安全科学学报,2003,13(3):61-64,84.
[6]NURICK G N,GELMAN M E,MARSHALL N S.Tearing of blast loaded plates with clamped boundary conditions[J].International Journal of Impact Engineering,1996,18(7):803-827.
[7]TEELING-SMITH R G,NURICK G N.The deformation and tearing of thin circular plates subjected to impulsive loads[J].International Journal of Impact Engineering,1991,11(1):77-91.
[8]GUPTA N K,NAGESH.Deformation and tearing of circular plates with varying support conditions under uniform impulsive loads[J].International Journal of Impact Engineering,2007,34:42-59.
[9]WIERZBICKI T,NURICK G N.Large deformation of thin plates under localised impulsive loading[J].International Journal of Impact Engineering,1996,18(7–8):899-918.
[10]JACOB N,NURICK G N,LANGDON G S.The effect of stand-off distance on the failure of fully clamped circular mild steel plates subjected to blast loads[J].Engineering Structures,2007,29(10):2723-2736.
[11]陈长海,朱锡,侯海量,等.近距空爆载荷作用下固支方板的变形及破坏模式[J].爆炸与冲击,2012,32(4):368-375.
[12]CHUNG K Y S,NURICK G N.Experimental and numerical studies on the response of quadrangular stiffened plates.Part I:Subjected to uniform blast load[J].International Journal of Impact Engineering,2005,31:55-83.
[13]LANGDON G S,YUEN S C K,NURICK G N.Experimental and numerical studies on the response of quadrangular stiffened plates.Part II:Localised blast loading[J].International Journal of Impact Engineering,2005,31:85-111.
[14]侯海量,朱锡,李伟,等.舱内爆炸冲击载荷特性实验研究[J].船舶力学,2010,14(8):901-907.
[15]孔祥韶,吴卫国,李俊,等.角隅结构对舱内爆炸载荷影响的实验研究[J].中国造船,2012,53(3):40-50.
[16]GERETTO C,CHUNG K Y S,NURICK G N.An experimental study of the effects of degrees of confinement on the response of square mild steel plates subjected to blast loading[J].International Journal of Impact Engineering,2015,79:32-44.
[17]侯海量,朱锡,梅志远.舱内爆炸载荷及舱室板架结构的失效模式分析[J].爆炸与冲击,2007,27(2):151-158.
[18]李伟,朱锡,梅志远,等.战斗部舱内爆炸对舱室结构毁伤的实验研究[J].舰船科学技术,2009,31(3):34-37.
[19]ZHAO Yapu.Saturated duration of rectangular pressure pulse applied to rectangular plates with finite-deflections[J].Mechanics Research Communications,1997,24(6):659-666.
[20]HENRYCH J,MAJOR R.The dynamics of explosion and its use[M].Elsevier/North-Holland,Inc.,New York,1979.