基于泡沫铝吸能层的某装置筒盖系统.doc
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基于泡沫铝吸能层的某装置筒盖系统,摘要由于某产品发射装置筒盖系统在工作过程中承受复杂多相流瞬时冲击作用，导致其结构上联接螺栓发生了延迟断裂失效，给产品的正常工作带来了一定的安全隐患。因此采用缓冲吸能装置对其进行降载来解决这个实际工程问题具有较大的实际意义和参考价值。泡沫铝材料作为一种吸能效果较为理想的金属材料得到了广泛应用，本文以此提出采用附着泡沫铝吸...
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摘要
由于某产品发射装置筒盖系统在工作过程中承受复杂多相流瞬时冲击作用，导致其结构上联接螺栓发生了延迟断裂失效，给产品的正常工作带来了一定的安全隐患。因此采用缓冲吸能装置对其进行降载来解决这个实际工程问题具有较大的实际意义和参考价值。
泡沫铝材料作为一种吸能效果较为理想的金属材料得到了广泛应用，本文以此提出采用附着泡沫铝吸能层作为缓冲吸能结构的方案来考察其对筒盖系统的降载效果。首先，以泡沫铝材料为研究对象建立了单胞泡沫铝有限元模型，并分析其动态压缩力学性能，得出了不同相对密度泡沫铝在受到冲击载荷时其应力应变特征曲线, 结果表明与相关理论及试验较为吻合；其次，建立了筒盖系统有限元模型以及后续建立的附着泡沫铝吸能层的筒盖系统有限元模型，并通过采用流固耦合情况下外载荷为压力场时联接螺栓所受最大等效应力的校核以及模型的模态振型的校核两种方式对所建立的筒盖系统有限元模型进行校核，校核结果证明所建立的筒盖系统有限元模型是合理和可行的；最后，通过选取不同范围的泡沫铝材料相对密度和厚度作为参变量，对所建立附着泡沫铝吸能层的筒盖系统有限元模型进行分析，考察泡沫铝对筒盖系统在工作时的缓冲降载效果，最终达到了缓冲降载的目的并获得了能够有效降载的泡沫铝吸能层的相对密度以及厚度的最优选取范围。
分析了另一种广泛用于缓冲吸能装置的结构，即薄壁管状吸能结构。着重分析了圆形截面和正六边形截面的管状吸能结构的吸能性能，并得出圆形管状结构在吸能性能上优于正六边形管状结构。以圆形截面为研究对象，在吸能性能上对其尺寸参数进行了优化并得到了最终优化的尺寸参数。最后以优化后得到的圆形截面管状结构作为缓冲吸能结构来考察其对筒盖系统的降载效果，结果表明圆形截面管状结构作为吸能装置起到了一定的降载效果。最终，通过与泡沫铝吸能层的降载效果比较得出，泡沫铝吸能层对筒盖系统的降载效果要优于圆形截面管状结构的降载效果。
关键词：筒盖系统； 降载； 有限元分析； 泡沫铝吸能层； 管状吸能结构
Abstract
The cover system of launching unit of a product bear the transient impact action by complex multiphase flow during the course of working, resulting in the failure of delayed fracture of connecting bolts of bearing base on its structure, which will introduce some potential safety hazards into the normal operation of the product. For this reason, it is imperative to use the buffer absorbing device to load shedding，and it is significant and valuable to study and solve this physical problem of engineering.
As a metal material foamed-aluminium is widely used with its good absorbtion effective, this paper points out that the plan of buffering energy-absorbing structure of attached foamed-aluminium absorption layer is adopted to investigate the load shedding effect on the cover system. Firstly, it represents the excellent characteristics shown by the foamed-aluminum absorption layer being energy-absorbing structure, and these characteristics can be subjects investigated to establish a finite element model with unit-cell foamed aluminum for analyzing its relative performance, from which the stress-strain characteristic curve of foam aluminum with differently relative density can be obtained, when impacted by impulse loads and the reliability of analyses certified; and then the geometrical model of cover system is established and the finite element model of cover system applied in this paper is finally determined by the finite element model based on the comparison of two classification methods, and the checking can be carried out via the finite element model based on two methods and the checking results demonstrate that the finite element model of cover system established is reasonable and feasible;The finite element model of cover system in the attached foamed-aluminum absorption layer is established and the relative density and thickness of foamed-aluminum materials with different ranges is selected as parameters, in order to investigate the buffering load shedding effect on cover system at operating, and the aim of buffering load shedding is achieved finally and the selection range of optimal parameters of foamed-aluminum absorption layer.
Another structure widely used in buffering energy-absorbing device is described and analyzed, i.e. thin-walled tube type energy-absorbing structure. The focus for analysis is on the energy absorption capacity of tubular energy absorption structure with circular cross section and regular hexagon cross section and the energy absorption capacity of the structure of circular tube type is superior to that of the structure of regular hexagon tube type. Taking the circular cross section as research object, its size parameters are optimized on the energy absorption capacity and the size parameters which are finally optimized are obtained. At last, the optimized structure of circular cross section tube type is taken as a buffering energy absorption structure to inspect the load shedding effect on the cover system, and the results show that taking this structure as the energy absorption device can play a role in shedding loads. Ultimately, compared with the load shedding effect of foamed-aluminum absorption layer, this effect is better than that of the structure with circular cross section tube type...
由于某产品发射装置筒盖系统在工作过程中承受复杂多相流瞬时冲击作用，导致其结构上联接螺栓发生了延迟断裂失效，给产品的正常工作带来了一定的安全隐患。因此采用缓冲吸能装置对其进行降载来解决这个实际工程问题具有较大的实际意义和参考价值。
泡沫铝材料作为一种吸能效果较为理想的金属材料得到了广泛应用，本文以此提出采用附着泡沫铝吸能层作为缓冲吸能结构的方案来考察其对筒盖系统的降载效果。首先，以泡沫铝材料为研究对象建立了单胞泡沫铝有限元模型，并分析其动态压缩力学性能，得出了不同相对密度泡沫铝在受到冲击载荷时其应力应变特征曲线, 结果表明与相关理论及试验较为吻合；其次，建立了筒盖系统有限元模型以及后续建立的附着泡沫铝吸能层的筒盖系统有限元模型，并通过采用流固耦合情况下外载荷为压力场时联接螺栓所受最大等效应力的校核以及模型的模态振型的校核两种方式对所建立的筒盖系统有限元模型进行校核，校核结果证明所建立的筒盖系统有限元模型是合理和可行的；最后，通过选取不同范围的泡沫铝材料相对密度和厚度作为参变量，对所建立附着泡沫铝吸能层的筒盖系统有限元模型进行分析，考察泡沫铝对筒盖系统在工作时的缓冲降载效果，最终达到了缓冲降载的目的并获得了能够有效降载的泡沫铝吸能层的相对密度以及厚度的最优选取范围。
分析了另一种广泛用于缓冲吸能装置的结构，即薄壁管状吸能结构。着重分析了圆形截面和正六边形截面的管状吸能结构的吸能性能，并得出圆形管状结构在吸能性能上优于正六边形管状结构。以圆形截面为研究对象，在吸能性能上对其尺寸参数进行了优化并得到了最终优化的尺寸参数。最后以优化后得到的圆形截面管状结构作为缓冲吸能结构来考察其对筒盖系统的降载效果，结果表明圆形截面管状结构作为吸能装置起到了一定的降载效果。最终，通过与泡沫铝吸能层的降载效果比较得出，泡沫铝吸能层对筒盖系统的降载效果要优于圆形截面管状结构的降载效果。
关键词：筒盖系统； 降载； 有限元分析； 泡沫铝吸能层； 管状吸能结构
Abstract
The cover system of launching unit of a product bear the transient impact action by complex multiphase flow during the course of working, resulting in the failure of delayed fracture of connecting bolts of bearing base on its structure, which will introduce some potential safety hazards into the normal operation of the product. For this reason, it is imperative to use the buffer absorbing device to load shedding，and it is significant and valuable to study and solve this physical problem of engineering.
As a metal material foamed-aluminium is widely used with its good absorbtion effective, this paper points out that the plan of buffering energy-absorbing structure of attached foamed-aluminium absorption layer is adopted to investigate the load shedding effect on the cover system. Firstly, it represents the excellent characteristics shown by the foamed-aluminum absorption layer being energy-absorbing structure, and these characteristics can be subjects investigated to establish a finite element model with unit-cell foamed aluminum for analyzing its relative performance, from which the stress-strain characteristic curve of foam aluminum with differently relative density can be obtained, when impacted by impulse loads and the reliability of analyses certified; and then the geometrical model of cover system is established and the finite element model of cover system applied in this paper is finally determined by the finite element model based on the comparison of two classification methods, and the checking can be carried out via the finite element model based on two methods and the checking results demonstrate that the finite element model of cover system established is reasonable and feasible;The finite element model of cover system in the attached foamed-aluminum absorption layer is established and the relative density and thickness of foamed-aluminum materials with different ranges is selected as parameters, in order to investigate the buffering load shedding effect on cover system at operating, and the aim of buffering load shedding is achieved finally and the selection range of optimal parameters of foamed-aluminum absorption layer.
Another structure widely used in buffering energy-absorbing device is described and analyzed, i.e. thin-walled tube type energy-absorbing structure. The focus for analysis is on the energy absorption capacity of tubular energy absorption structure with circular cross section and regular hexagon cross section and the energy absorption capacity of the structure of circular tube type is superior to that of the structure of regular hexagon tube type. Taking the circular cross section as research object, its size parameters are optimized on the energy absorption capacity and the size parameters which are finally optimized are obtained. At last, the optimized structure of circular cross section tube type is taken as a buffering energy absorption structure to inspect the load shedding effect on the cover system, and the results show that taking this structure as the energy absorption device can play a role in shedding loads. Ultimately, compared with the load shedding effect of foamed-aluminum absorption layer, this effect is better than that of the structure with circular cross section tube type...
