分别采用圆柱体的平压头应力(FEP)、球面压头(SEP)和圆锥面压头(CEP)3种不同形状的压头对不同参数泡沫纯铝和泡沫AlSi12合金进行了准静态压坑实验,研究了泡沫铝压坑变形的应力随压入深度变化的响应特征,以及相对密度对压坑应力及吸能性的影响.结果表明:平压头压坑的应力-压深曲线由弹性段和应力持续上升的塑性段组成,有明显的屈服点,屈服强度和压坑应力均随密度增加而升高,球面压头和圆锥面压头压坑应力-压深曲线上没有明显的弹性段,只有应力先缓慢上升然后快速升高的塑性段.随相对密度增加和基体强度提高,泡沫铝的压坑应力和吸能性均显著上升.
Quasi-static indentation experiments were carried out on pure aluminum foams and AlSil2 alloy foams with different parameters by using three types of indenter with different end geometries,fiat-ended punch (FEP),spherical-ended punch (SEP) and conical-ended punch (CEP),respectively.The variation of stress with indentation depth was studied during indention deformation of the aluminum foams,and effects of the relative density on the stress and energy absorption of the foams were investigated.The results show that stress-indentation depth curve of the aluminum during FEP indention exhibits two regions including an elastic region and a plateau regime with continuous rise in stress.A distinct yield point is observed on the curve.The yield strength and indention stress of the aluminum foams increase with increasing relative density.The stress-indentation depth curves of the aluminum during SEP and CEP indention are not exhibit distinct yield point.It is found on these curves that stress increases slowly in initial stage and then increases rapidly with the increasing of the indention depth.The indention stress as well as energy absorption of the aluminum foams increase with increasing relative density and strength of the foam matrix.
参考文献
| [1] | C. SAN MARCHI;A. MORTENSEN.DEFORMATION OF OPEN-CELL ALUMINUM FOAM[J].Acta materialia,200119(19):3959-3969. |
| [2] | H. F. Cheng;F. S. Han.Compressive behavior and energy absorbing characteristic of open cell aluminum foam filled with silicate rubber[J].Scripta materialia,20036(6):583-586. |
| [3] | Banhart J.;Baumeister J..Deformation characteristics of metal foams[J].Journal of Materials Science,19986(6):1431-1440. |
| [4] | 左孝青;孙加林.泡沫金属的性能及应用研究进展[J].昆明理工大学学报（理工版）,2005(1):13-17. |
| [5] | 周志伟;王志华;赵隆茂;树学峰.复合应力下泡沫铝屈服行为实验研究[J].高压物理学报,2012(02):171-176. |
| [6] | 程和法;胡孔刚;薛国宪;田杰;张章;戴光星.泡沫铝合金显微组织和压缩力学性能的研究[J].材料热处理学报,2005(4):60-64. |
| [7] | E. W. Andrews;G. Gioux;P. Onck;L. J. Gibson.Size effects in ductile cellular solids. Part II: experimental results[J].International Journal of Mechanical Sciences,20013(3):701-713. |
| [8] | Kumar PS.;Ramachandra S.;Ramamurty U..Effect of displacement-rate on the indentation behavior of an aluminum foam[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,20031/2(1/2):330-337. |
| [9] | 程和法;黄笑梅;薛国宪;李剑荣;韩福生.Compressive deformation behavior and energy absorption characteristic of aluminum foam with elastic filler[J].中国有色金属学会会刊（英文版）,2004(5):928-933. |
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