新形式超弹性形状记忆合金线材力学性能试验研究
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摘要
超弹性是形状记忆合金(SMA)的重要特性之一.鉴于钢绞线在力学性能上的优势,提出一种新形式的SMA线材——SMA绞线,其目的在于将其埋设到土木工程领域的混凝土构件中.通过试验,主要研究了应变幅值和加卸载循环次数对普通圆截面SMA丝材和SMA绞线的应力诱发马氏体相变应力、残余应变、最大相变应变和耗能能力的影响.研究结果表明,SMA绞线比SMA丝具有更好的力学性能.建议在工程应用中将SMA的线材形式作为一项影响其超弹性力学性能的因素.
Superelasticity is one of the most important properties of shape memory alloy(SMA).Considering the advantages of steel strands in mechanical properties,a new form of SMA wires — SMA strands,is proposed,which can be applied to concrete members.The superelastic mechanical properties,such as stress-induced martensite phase transformation stress,residual strain,maximum phase transition strain and damping properties,of the SMAs in both the ordinary SMA wires and the strands are compared with respect to strain amplitude and cyclic number.By analyzing the test results,a conclusion can be drawn that the mechanical properties of the SMA strands are better than those of the SMA wires.The form of SMA is suggested as an influencing factor of the superelastic mechanical properties.
Superelasticity is one of the most important properties of shape memory alloy(SMA).Considering the advantages of steel strands in mechanical properties,a new form of SMA wires — SMA strands,is proposed,which can be applied to concrete members.The superelastic mechanical properties,such as stress-induced martensite phase transformation stress,residual strain,maximum phase transition strain and damping properties,of the SMAs in both the ordinary SMA wires and the strands are compared with respect to strain amplitude and cyclic number.By analyzing the test results,a conclusion can be drawn that the mechanical properties of the SMA strands are better than those of the SMA wires.The form of SMA is suggested as an influencing factor of the superelastic mechanical properties.
引文
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[11]LAGOUDAS D C,ENTCHEV P B,KUMAR P K.Thermomechanical characterization of SMAactuators under cyclic loading[C]∥Proceedings ofIMECE′03.2003 ASME International MechanicalEngineering Congress.Washington D C:ASME,2003:1-7
[12]MCCORMICK J,DESROCHES R.Dampingproperties of shape memory alloys for seismicapplications[C]∥Proceeding of ASCE StructuresCongress.Nashville:ASCE,2004:1-11
[13]MIYAZAKI S,IMAI T,IGO Y,et al.Effect ofcyclic deformation on the pseudoelasticitycharacteristics of Ti-Ni alloys[J].Metal Trans A,1986,17A(1):115-120
[2]任勇生.智能材料在土木结构监测和振动控制中的应用[J].太原理工大学学报,2000,31(5):486-493
[3]李宏男.结构健康监测[M].大连:大连理工大学出版社,2004
[4]STRNADEL B,OHASHI S,OHTSUKA H,et al.Effect of cycling on the pseudoelasticitycharacteristics of Ti-Ni and Ti-Ni-Cu alloy[J].Mater Sci and Eng,1995,A203:187-196
[5]PIEDBOEUF M C,GAUVIN R.Damping behaviourof shape memory alloys:strain,amplitude,frequency and temperature effects[J].J Sound andVib,1998,214(5):885-901
[6]DOLCE M,CARDONE1 D,MARNETTO R.Implementation and testing of passive control devicesbased on shape memory alloys[J].Earthquake Engand Struct Dyn,2000,29:945-968
[7]DOLCE M,CARDONE D.Mechanical behaviour ofshape memory alloys for seismic applications 2.Austenite NiTi wires subjected to tension[J].Int JMech Sci,2001,43:2657-2677
[8]巩建鸣,户伏寿昭.承受各种循环加载的TiNi形状记忆合金的超弹性变形行为[J].功能材料,2002,33(4):391-393,397
[9]倪立峰,李爱群,左晓宝.工程结构的SMA超弹性阻尼研究[J].东南大学学报(自然科学版),2003,33(2):168-171
[10]左晓宝,李爱群,倪立峰,等.超弹性形状记忆合金丝(NiTi)力学性能的试验研究[J].土木工程学报,2004,37(12):10-16
[11]LAGOUDAS D C,ENTCHEV P B,KUMAR P K.Thermomechanical characterization of SMAactuators under cyclic loading[C]∥Proceedings ofIMECE′03.2003 ASME International MechanicalEngineering Congress.Washington D C:ASME,2003:1-7
[12]MCCORMICK J,DESROCHES R.Dampingproperties of shape memory alloys for seismicapplications[C]∥Proceeding of ASCE StructuresCongress.Nashville:ASCE,2004:1-11
[13]MIYAZAKI S,IMAI T,IGO Y,et al.Effect ofcyclic deformation on the pseudoelasticitycharacteristics of Ti-Ni alloys[J].Metal Trans A,1986,17A(1):115-120
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