不同D/t比例对空心铝管材料能量吸收和塑性破坏性能的影响
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摘要
为研究设备中使用的铝管材料能量吸收和塑性破坏性能,以滑靴副摩擦磨损试验机中空铝管材料6061-T4为载体,研究铝管在三点准静态横向载荷的作用下的塑性破坏程度和能量吸收大小。以三点准静态下不同跨度尺寸为研究试点,提出了两种试验理论并运用铝管拉伸试验机ISTRON-8801进行试验分析。结果表明,经过横向标准三点处弯曲加载的圆形铝管结构经历了三个塑性变形阶段:起皱阶段、起皱与弯曲阶段、结构崩溃阶段。在恒定跨度长度中,铝管随着不同直径/厚度(D/t)比例(12.48、22.54、27.50和36.32)的增加,所吸收的应变能量也会增加;管子承受的最大载荷也随着D/t比例的增加而增加。同时,管子在皱缩阶段吸收能量大小会受D/t比例的变化影响。
In order to study the energy absorption and plastic damage properties of the aluminum tube materials used in the equipment,the hollow aluminum tube material 6061-T4 of the sliding shoe pair friction and wear test machine was used as the carrier to study the aluminum tube under the action of three-point quasi-static lateral load,the hollow aluminum tube material 6061-T4 of the sliding shoe pair friction and wear test machine was used as the carrier to study the aluminum tube under the action of three-point quasi-static lateral load.The plastic damage degree and energy absorption of the hollow aluminum tube under the action of the quasi-static lateral load at three points were extracted.Taking the three-point quasi-static and different span dimensions as the research pilots,two test theories were proposed and tested by aluminum tube tensile tester ISTRON-8801.The results show that the structure of the circular aluminum tube subjected to bending at three points in the transverse standard undergoes three stages of plastic deformation:the wrinkling stage,the wrinkling and bending stage,and the structural collapse stage.In a constant span length,the absorption energy of the aluminum tube increases with different diameter/thickness(D/t)ratios(12.48,22.54,27.50,and 36.32);the maximum load that the tube bears also follows D/t ratio increases as the ratio increases.At the same time,the amount of energy absorbed by the tube during the shrinkage phase is greatly affected by the change in the D/t ratio.
In order to study the energy absorption and plastic damage properties of the aluminum tube materials used in the equipment,the hollow aluminum tube material 6061-T4 of the sliding shoe pair friction and wear test machine was used as the carrier to study the aluminum tube under the action of three-point quasi-static lateral load,the hollow aluminum tube material 6061-T4 of the sliding shoe pair friction and wear test machine was used as the carrier to study the aluminum tube under the action of three-point quasi-static lateral load.The plastic damage degree and energy absorption of the hollow aluminum tube under the action of the quasi-static lateral load at three points were extracted.Taking the three-point quasi-static and different span dimensions as the research pilots,two test theories were proposed and tested by aluminum tube tensile tester ISTRON-8801.The results show that the structure of the circular aluminum tube subjected to bending at three points in the transverse standard undergoes three stages of plastic deformation:the wrinkling stage,the wrinkling and bending stage,and the structural collapse stage.In a constant span length,the absorption energy of the aluminum tube increases with different diameter/thickness(D/t)ratios(12.48,22.54,27.50,and 36.32);the maximum load that the tube bears also follows D/t ratio increases as the ratio increases.At the same time,the amount of energy absorbed by the tube during the shrinkage phase is greatly affected by the change in the D/t ratio.
引文
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[12]POONAYA S,TEEBOONMA U,THINVONGPITUK C.Plastic collapse analysis of thin-walled circular tubes subjected to bending[J].International Journal of Mechanical Science,2009,47(6):637-645.
[13]GUO L,YANG S,JIAO H.Behavior of thin-walled circular hollow section tubes subjected to bending[J].Steel Construction,2013,73(4):281-289.
[2]ABDULGHANI O,EDMUND M,SALEEM H.Metallic tube type energy absorbers:a synopsis[J].Steel Construction,2008,45(7):706-726.
[3]REDDY T Y,REID S R.Phenomena associated with the crushing of metal tubes between rigid plates[J].International Journal of Solids Structures,1979(14):545-562.
[4]GUPTA N K,SEKHON G S,GUPTA P K.Study of lateral compression of round metallic tubes[J].Thinwalled Structures,2005,43(6):895-922.
[5]THOMAS S G,REI S R,JOHNSON W.Large deformations of thin-walled circular tubes under transverse loading—an experimental survey of the bending of simply supported tubes under a central load[J].International Journal of Mechanical Sciences,1976,18(6):325-326.
[6]REID S R.Plastic deformation mechanisms in axially compressed metal tubes used as impact energy absorbers[J].International Journal of Mechanical Sciences,1993,35(12):1035-1052.
[7]WANG B,LU G.Mushrooming of circular tubes under dynamic axial loading[J].Thin-walled Structures,2002,40(2):167-182.
[8]REID S R,HARRIGAN,et al.Transient effects in the quasi-static and dynamic internal inversion and nosing of metal tubes[J].International Journal of Mechanical Sciences,1998,40(40):263-280.
[9]JIANG P,WANG W,ZHANG G J.Size effects in the axial tearing of circular tubes during quasi-static and impact loadings[J].International Journal of Impact Engineering,2006,32(12):2048-2065.
[10]REDDY T Y,REID S R.Axial splitting of circular metal tubes[J].International Journal of Mechanical Sciences,1986,28(2):111-131.
[11]WATSON A R,REID S R,JOHNSON W.Large deformations of thin-walled circular tubes under transverse loading—III:Further experiments on the bending of simply supported tubes[J].International Journal of Mechanical Sciences,1976,18(9):501-502.
[12]POONAYA S,TEEBOONMA U,THINVONGPITUK C.Plastic collapse analysis of thin-walled circular tubes subjected to bending[J].International Journal of Mechanical Science,2009,47(6):637-645.
[13]GUO L,YANG S,JIAO H.Behavior of thin-walled circular hollow section tubes subjected to bending[J].Steel Construction,2013,73(4):281-289.