泡沫铝填充薄壁结构及三明治结构力学性能的数值模拟
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摘要
泡沫铝是一种新型工程材料,它集力学、热学、声学等特性于一身,是一种多功能、多用途材料,能够满足人们对材料的更高的要求,可以应用在国民经济的各个领域和部门,在军事上也具有广阔的应用前景。
本文对泡沫铝层合结构的力学性能进行了实验研究和数值模拟分析。这些工作将对泡沫铝及其层合结构的应用具有积极的指导意义。
本文首先采用ABAQUS软件建立了薄壁铝合金圆管及泡沫铝填充薄壁铝合金圆管的有限元模型,对这两种结构压缩的力学行为进行了数值模拟,与实验结果基本相符合。依据薄壁铝合金圆管及泡沫铝填充薄壁铝合金圆管的应力应变图,对两种结构的力学性能做了对比,发现填充泡沫铝后,层合圆管承受压力的能力大大提高。
其次研究了泡沫铝填充薄壁铝合金方管准静态轴向压缩条件下的力学性能,采用ABAQUS软件建立了薄壁铝合金方管的有限元模型进行数值模拟,并且与相应的实验结果作对比,两者结果基本吻合。实验结果和数值模拟结果都表明填充泡沫铝后,层合方管承受压力的能力大大提高。
最后研究了泡沫铝层合梁准静态三点弯曲条件下的力学性能,依旧采用ABAQUS分析软件建立泡沫铝层合梁的有限元模型进行数值模拟。结果表明：泡沫铝层合梁的载荷曲线远远高于泡沫铝和面板的载荷曲线之和,泡沫铝层合梁在保持泡沫铝轻质的同时,大大提高了其载荷极限和抗弯强度,显示出良好的层合效果。
本文对于泡沫铝填充薄壁结构和泡沫铝层合梁结构进行了有限元数值模拟,由于涉及的参数较多,结构较复杂,建立合理的数值计算模型对于结构力学性能研究和结构优化设计有着重要的现实意义。
Aluminum and aluminum alloy foam is a kind of engineering material, which has an interesting combination of mechanical and physical properties, such as high strength and stiffness for a given weight. So it is multifunctional solid and can be used in a variety of civil industries, such as automobile, railway and component manufacturing.
In present thesis, Experimental research on the mechanical behaviors of aluminum foam is carried out. The conclusion will make an important role in its applications.
Firstly, finite element models of empty and fully foam-filled tubes are established and the compressing behavior of these structures is simulated with the use of ABAQUS software, and the mechanical behavior of thin-walled cylindrical aluminum alloy tube with aluminum foam filler is studied by simulating compression's experiments numerically and compare with the results of experiments'. Finally the numerical results are in good agreement with those obtained experimentally. According to thin-walled cylindrical aluminum alloy tube and thin-walled cylindrical aluminum alloy tube with aluminum foam filler's stress-strain drawings, the two structures are contrasted. The results are fully foam-filled tubes can endure more stress than the empty tubes.
Secondly, Vertical compressing mechanical properties of thin-walled square tubes filled with aluminum foam under quasi-static loading conditions were studied in this paper. And finite element models of empty tubes was established and the compressing behavior of this structures was simulated with the use of ABAQUS software, The results indicated that fully foam-filled tubes can endure more stress than the empty tubes.
Finally, three-point bending mechanical properties of sandwich beams with aluminum foam core were studied in this paper. And finite element model of sandwich beams with aluminum foam core was established and the three-point bending of this structure was simulated with the use of ABAQUS software. The results indicated that the load curve of sandwich beams with aluminum foam core loading in three-point bending is higher than both curve of aluminum foam and aluminum board in three point bending. The sandwich beams with aluminum foam core not only remain feature but also improve ultimate of its load and winding, so the sandwich beams with aluminum foam core is excellent for more good mechanics property.
In this paper mechanical property of aluminum foam filled tubes and sandwich beams with aluminum foam core are simulated with the use of ABAQUS software. As a result of these structures are complex and involve a lot of parameter, establish rational mathematic models are very useful for these structures'mechanical and optimize.
本文对泡沫铝层合结构的力学性能进行了实验研究和数值模拟分析。这些工作将对泡沫铝及其层合结构的应用具有积极的指导意义。
本文首先采用ABAQUS软件建立了薄壁铝合金圆管及泡沫铝填充薄壁铝合金圆管的有限元模型,对这两种结构压缩的力学行为进行了数值模拟,与实验结果基本相符合。依据薄壁铝合金圆管及泡沫铝填充薄壁铝合金圆管的应力应变图,对两种结构的力学性能做了对比,发现填充泡沫铝后,层合圆管承受压力的能力大大提高。
其次研究了泡沫铝填充薄壁铝合金方管准静态轴向压缩条件下的力学性能,采用ABAQUS软件建立了薄壁铝合金方管的有限元模型进行数值模拟,并且与相应的实验结果作对比,两者结果基本吻合。实验结果和数值模拟结果都表明填充泡沫铝后,层合方管承受压力的能力大大提高。
最后研究了泡沫铝层合梁准静态三点弯曲条件下的力学性能,依旧采用ABAQUS分析软件建立泡沫铝层合梁的有限元模型进行数值模拟。结果表明：泡沫铝层合梁的载荷曲线远远高于泡沫铝和面板的载荷曲线之和,泡沫铝层合梁在保持泡沫铝轻质的同时,大大提高了其载荷极限和抗弯强度,显示出良好的层合效果。
本文对于泡沫铝填充薄壁结构和泡沫铝层合梁结构进行了有限元数值模拟,由于涉及的参数较多,结构较复杂,建立合理的数值计算模型对于结构力学性能研究和结构优化设计有着重要的现实意义。
Aluminum and aluminum alloy foam is a kind of engineering material, which has an interesting combination of mechanical and physical properties, such as high strength and stiffness for a given weight. So it is multifunctional solid and can be used in a variety of civil industries, such as automobile, railway and component manufacturing.
In present thesis, Experimental research on the mechanical behaviors of aluminum foam is carried out. The conclusion will make an important role in its applications.
Firstly, finite element models of empty and fully foam-filled tubes are established and the compressing behavior of these structures is simulated with the use of ABAQUS software, and the mechanical behavior of thin-walled cylindrical aluminum alloy tube with aluminum foam filler is studied by simulating compression's experiments numerically and compare with the results of experiments'. Finally the numerical results are in good agreement with those obtained experimentally. According to thin-walled cylindrical aluminum alloy tube and thin-walled cylindrical aluminum alloy tube with aluminum foam filler's stress-strain drawings, the two structures are contrasted. The results are fully foam-filled tubes can endure more stress than the empty tubes.
Secondly, Vertical compressing mechanical properties of thin-walled square tubes filled with aluminum foam under quasi-static loading conditions were studied in this paper. And finite element models of empty tubes was established and the compressing behavior of this structures was simulated with the use of ABAQUS software, The results indicated that fully foam-filled tubes can endure more stress than the empty tubes.
Finally, three-point bending mechanical properties of sandwich beams with aluminum foam core were studied in this paper. And finite element model of sandwich beams with aluminum foam core was established and the three-point bending of this structure was simulated with the use of ABAQUS software. The results indicated that the load curve of sandwich beams with aluminum foam core loading in three-point bending is higher than both curve of aluminum foam and aluminum board in three point bending. The sandwich beams with aluminum foam core not only remain feature but also improve ultimate of its load and winding, so the sandwich beams with aluminum foam core is excellent for more good mechanics property.
In this paper mechanical property of aluminum foam filled tubes and sandwich beams with aluminum foam core are simulated with the use of ABAQUS software. As a result of these structures are complex and involve a lot of parameter, establish rational mathematic models are very useful for these structures'mechanical and optimize.
引文
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