圆片小冲杆试验新方法与航空材料力学性能互换  

Novel small punch testing method and its application to conversion of mechanical properties for aerospace materials

作　　者：李纪涛 韩光照 熊俊 周甜 蔡力勋[2] LI Jitao;HAN Guangzhao;XIONG Jun;ZHOU Tian;CAI Lixun(Chengdu Aircraft Industrial(Group)Co.Ltd.,Chengdu 610092,China;Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province,School of Mechanics and Aerospace Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]成都飞机工业(集团)有限责任公司,成都610092 [2]西南交通大学力学与航空航天学院应用力学与结构安全四川省重点实验室,成都610031

出　　处：《航空学报》2024年第3期252-260,共9页Acta Aeronautica et Astronautica Sinica

基　　金：国家自然科学基金(11872320)。

摘　　要：针对具有结构材料微损取样优势的圆片小冲杆试验,基于能量密度等效理论,建立了关联圆片微试样小冲杆试验载荷、位移、几何尺寸和材料单轴力学律参数的载荷-位移模型;进而针对航空金属材料,提出了单轴拉伸试验结果与小冲杆试验结果之间实现材料力学性能互换的小冲杆试验新方法。对5种航空金属材料完成了小冲杆试验及传统拉伸试验,结果表明,新方法所得圆片微试样的应力-应变曲线与单轴拉伸试验结果密切吻合,所得弹性模量与单轴拉伸试验结果之间相对误差在10%以内,所得塑性延伸强度和抗拉强度与单轴拉伸试验结果相对误差大部分在5%以内。新方法有望促进小冲杆试验在服役结构安全评价中的应用。For the small punch test with the advantage of slightly damaged sampling,a theoretical model was derived based on the energy density equivalence principle to describe the relationships among the load,displacement,geo⁃metric size,and uniaxial mechanical law parameters.A novel small punch test method was then proposed for aero⁃space materials to convert mechanical properties between uniaxial tensile test results and small punch test results.Small punch tests and uniaxial tensile tests were carried out on five aerospace materials.The results show that the stress-strain curves obtained by the new method were in close agreement with those obtained by uniaxial tensile tests;the relative errors of the elastic moduli obtained by the new method results and the uniaxial tensile test results were within 10%;and the relative errors of the yield strengths and tensile strengths obtained by the two methods were mostly within 5%.The proposed method is expected to promote the application of SPT for the safety evaluation of inservice structures.

关 键 词：小冲杆试验 能量密度等效 应力-应变关系 强度 试验方法 

分 类 号：V219[航空宇航科学与技术—航空宇航推进理论与工程]