In order to constitute engineering design methods of the flat ribbon wound explosion containment vessels, the dynamic response of such vessels subjected to internal explosion loading is simulated using LS-DYNA3D. Thre...In order to constitute engineering design methods of the flat ribbon wound explosion containment vessels, the dynamic response of such vessels subjected to internal explosion loading is simulated using LS-DYNA3D. Three winding angles, 10°, 15°and 20°, are considered. It is shown that among ribbon vessels investigated, the center displacement of outermost ribbons of the vessel with 10°winding angle is the smallest under the same blast loading. The response of vessels loaded in inner core is local. From the center of the cylindrical shell to the bottom cover, the maximum strain gradually decreases. The ribbons are subjected to tension in the length direction and compression in the width direction. Blasting shock energy concentrates on where is close to center section of blasting. For comparison, numerical simulation of a monobloc thick-walled explosion containment vessel is also investigated. It can be found that the biggest deformation of the flat ribbon wound explosion containment vessels is bigger than that of the monobloc thick-walled explosion containment vessel in the center section of blasting under the same TNT. Numerical results are approximately in agreement with experimental ones. It is proved that the ribbon vessels have the valuable properties of ' leak before burst at worst' compared with the monobloc vessels through numerical simulation.展开更多
In order to study the dynamic response and calculate the axial dynamic coefficient of the monolayer cylindrical explosion vessel,the wall of vessel is simplified as a multi-degree-of-freedom(MDoF) undamped elastic fou...In order to study the dynamic response and calculate the axial dynamic coefficient of the monolayer cylindrical explosion vessel,the wall of vessel is simplified as a multi-degree-of-freedom(MDoF) undamped elastic foundation beam.Decoupling the coupled motion equation and using Duhamel's integrals,the solutions in generalized coordinates of the equations under exponentially decaying loads,square wave loads and triangular wave loads are calculated.These solutions are consistent in form with the solutions of single-degree-of-freedom(SDoF) undamped forced vibration simplified model.Based on the model,equivalent MDoF design method(also called MDoF dynamic coefficient method) of cylindrical explosion vessel is proposed.The traditional method can only predict the dynamic coefficient of torus portion around the explosion center,but this method can predict that of the vessel wall at any axial n dividing point position.It is verified that the prediction accuracy of this model is greatly improved compared with the SDoF model by comparing the results of this model with SDoF model and numerical simulation in different working conditions.However,the prediction accuracy decreases as the scaled distance decreases and approaches the end of the vessel,which is related to the accuracy of the empirical formula of the implosion load,the simplification of the explosion load direction,the boundary conditions,and the loading time difference.展开更多
针对目前复合材料抗爆容器工程设计方法合理性欠缺现状,基于轻量化思路,结合动力系数法及网格理论提出了可用于含金属内衬复合材料抗爆容器设计的“等代设计法”。采用该方法完成了内径0.5 m、抗爆当量1 kg TNT的复合材料圆筒初始设计,...针对目前复合材料抗爆容器工程设计方法合理性欠缺现状,基于轻量化思路,结合动力系数法及网格理论提出了可用于含金属内衬复合材料抗爆容器设计的“等代设计法”。采用该方法完成了内径0.5 m、抗爆当量1 kg TNT的复合材料圆筒初始设计,复合材料圆筒的面密度由等效金属圆筒的19.3 g/cm^(2)降低到3.6 g/cm^(2)。在该圆筒内部开展了炸药加载试验,结果表明圆筒设计合理,该设计方法有效,为抗爆容器的轻量化设计提供了新思路。展开更多
针对爆炸容器初始设计常用的动力系数法存在的设计余量过大问题,通过将Johnson-Cook本构模型的应变率项纳入结构振动方程,推导出考虑应变率效应的等效静载荷计算方法。采用本文方法及常规动力系数法对不同半径的球形容器在1 kg TNT炸药...针对爆炸容器初始设计常用的动力系数法存在的设计余量过大问题,通过将Johnson-Cook本构模型的应变率项纳入结构振动方程,推导出考虑应变率效应的等效静载荷计算方法。采用本文方法及常规动力系数法对不同半径的球形容器在1 kg TNT炸药加载下的壁厚进行了理论设计,并通过高置信度数值模型对两种方法所设计的容器的结构响应进行了数值计算。结果显示,两种方法所设计的容器均在弹性范围,但是本文方法的容器壁厚更小、结构应力更大。这表明通过考虑应变率效应,本文方法可合理降低设计载荷以减小设计余量,进而更充分地发挥材料与结构的力学性能,并可用于金属爆炸容器的初始设计。展开更多
为满足科学试验的使用需求,设计一台2 kg TNT当量的圆柱形爆炸容器,并对其进行理论抗爆强度计算、数值模拟验证和动态试验监测。研究结果表明:2 kg TNT当量圆柱形爆破容器的结构设计合理,抗爆强度满足试验要求,最大允许工作压力具有较...为满足科学试验的使用需求,设计一台2 kg TNT当量的圆柱形爆炸容器,并对其进行理论抗爆强度计算、数值模拟验证和动态试验监测。研究结果表明:2 kg TNT当量圆柱形爆破容器的结构设计合理,抗爆强度满足试验要求,最大允许工作压力具有较大裕度;数值模拟中爆炸容器单元峰值压应力分别位于圆柱壳体和椭圆封头中心位置,均远小于屈服强度;减振沟以外监测点的峰值振动在安全允许振速范围内;噪声强度满足设计规范要求。爆炸容器结构设计合理,可为类似爆炸容器的设计和验证提供参考。展开更多
基金Supported by National Natural Science Foundation of China(No. 10372091)
文摘In order to constitute engineering design methods of the flat ribbon wound explosion containment vessels, the dynamic response of such vessels subjected to internal explosion loading is simulated using LS-DYNA3D. Three winding angles, 10°, 15°and 20°, are considered. It is shown that among ribbon vessels investigated, the center displacement of outermost ribbons of the vessel with 10°winding angle is the smallest under the same blast loading. The response of vessels loaded in inner core is local. From the center of the cylindrical shell to the bottom cover, the maximum strain gradually decreases. The ribbons are subjected to tension in the length direction and compression in the width direction. Blasting shock energy concentrates on where is close to center section of blasting. For comparison, numerical simulation of a monobloc thick-walled explosion containment vessel is also investigated. It can be found that the biggest deformation of the flat ribbon wound explosion containment vessels is bigger than that of the monobloc thick-walled explosion containment vessel in the center section of blasting under the same TNT. Numerical results are approximately in agreement with experimental ones. It is proved that the ribbon vessels have the valuable properties of ' leak before burst at worst' compared with the monobloc vessels through numerical simulation.
基金supported by grants from the Department of Infrastructure Barracks and National Science-Technology Support Plan(Grants No.BY209J033 and 2012BAK05B01)。
文摘In order to study the dynamic response and calculate the axial dynamic coefficient of the monolayer cylindrical explosion vessel,the wall of vessel is simplified as a multi-degree-of-freedom(MDoF) undamped elastic foundation beam.Decoupling the coupled motion equation and using Duhamel's integrals,the solutions in generalized coordinates of the equations under exponentially decaying loads,square wave loads and triangular wave loads are calculated.These solutions are consistent in form with the solutions of single-degree-of-freedom(SDoF) undamped forced vibration simplified model.Based on the model,equivalent MDoF design method(also called MDoF dynamic coefficient method) of cylindrical explosion vessel is proposed.The traditional method can only predict the dynamic coefficient of torus portion around the explosion center,but this method can predict that of the vessel wall at any axial n dividing point position.It is verified that the prediction accuracy of this model is greatly improved compared with the SDoF model by comparing the results of this model with SDoF model and numerical simulation in different working conditions.However,the prediction accuracy decreases as the scaled distance decreases and approaches the end of the vessel,which is related to the accuracy of the empirical formula of the implosion load,the simplification of the explosion load direction,the boundary conditions,and the loading time difference.
文摘针对爆炸容器初始设计常用的动力系数法存在的设计余量过大问题,通过将Johnson-Cook本构模型的应变率项纳入结构振动方程,推导出考虑应变率效应的等效静载荷计算方法。采用本文方法及常规动力系数法对不同半径的球形容器在1 kg TNT炸药加载下的壁厚进行了理论设计,并通过高置信度数值模型对两种方法所设计的容器的结构响应进行了数值计算。结果显示,两种方法所设计的容器均在弹性范围,但是本文方法的容器壁厚更小、结构应力更大。这表明通过考虑应变率效应,本文方法可合理降低设计载荷以减小设计余量,进而更充分地发挥材料与结构的力学性能,并可用于金属爆炸容器的初始设计。
文摘为满足科学试验的使用需求,设计一台2 kg TNT当量的圆柱形爆炸容器,并对其进行理论抗爆强度计算、数值模拟验证和动态试验监测。研究结果表明:2 kg TNT当量圆柱形爆破容器的结构设计合理,抗爆强度满足试验要求,最大允许工作压力具有较大裕度;数值模拟中爆炸容器单元峰值压应力分别位于圆柱壳体和椭圆封头中心位置,均远小于屈服强度;减振沟以外监测点的峰值振动在安全允许振速范围内;噪声强度满足设计规范要求。爆炸容器结构设计合理,可为类似爆炸容器的设计和验证提供参考。
