摘要
基于机械形状记忆合金(SMAs)模型的有限元分析方法,分析了一定位移载荷下的NiTi合金夹芯体单元,得到夹芯体结构的应力和腹板数关系曲线、应力和应变曲线、马氏体的体积分数分布图、功和能时程关系、冲击力时程曲线等。结果表明:腹板不同的结构应力相差1178 MPa,当结构的腹板长宽比10≤l/b≤60时,结构的安全性和经济性分别提高5倍和降低40%,此外,材料的马氏体转变和主应力有直接关系,结构的应力-应变曲线耗能迟滞环面积为5.9(位移70 mm载荷),且随变形增加耗能迟滞环增大到10.3(位移100 mm载荷),产生的较大非线性变形可以完全自动恢复。结构具有至少8%可恢复应变的超弹性、抗冲击性和耗能能力。
Based on the finite element analysis method of mechanical shape memory alloy(SMAs)model,the sandwich body element of NiTi alloy under certain displacement load was analyzed,and the relation curve between stress and web number,stress and strain curve,martensite volume fraction distribution diagram,work and energy time history curve and impact force time history curve were obtained.The results show that the difference of stress field between different structures of web is 1178 MPa.When the ratio of length to width of web is 10≤l/b≤60,the safety and economy of the structure can be increased by 5 times and reduced by 40%,respectively.In addition,the martensitic transformation of materials is directly related to the principal stress.The stress⁃strain curve of the structure shows that the area of energy dissipation hysteresis ring is 5.9(displacement of 70 mm load),and with the increase of deformation,the energy dissipation hysteresis ring increases to 10.3 accordingly(displacement of 100 mm load),and the larger nonlinear deformation can be recovered automatically.The structure has a super elastic with at least 8%recoverable strain,impact resistance and energy dissipation capacity.
作者
智友海
史向平
ZHI Youhai;SHI Xiangping(Civil Engineering Department,Xuzhou Institute of Technology,Xuzhou 221000,China)
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2023年第6期99-106,共8页
Ordnance Material Science and Engineering
关键词
夹芯体
形状记忆合金
超弹性
抗冲击性
耗能迟滞环
马氏体体积分数
sandwich body
shape memory alloys
super elastic
impact resistance
energy dissipation hysteresis loop
volume fraction of martensite
