DETERMINATION OF THE MICROSCALE STRESS-STRAIN CURVE AND STRAIN GRADIENT EFFECT FROM THE MICRO-BEND OF ULTRA-THIN BEAMS

摘要：

A simple method is established to determine the microscale uniaxial stress-straincurve from the load and deflection data for a doubly clamped beam.The method isbased on the fact that，for beam deflection much larger than the beam thickness，theaxial stretching dominates the deformation in the doubly clamped beam and thedoubly clamped beam behaves like a simple plastic hinge.The microscale uniaxialstress-strain curve，together with the cantilever beam experiments.is used todetermine the strain gradient effect in Au thin beams.By comparing with theexperimental data for a cantilever Au thin beam,the parameter αwas obtained as0.246.The effect of finite rotation is accounted for.and the results agree well withthe experiments for a cantilever Au thin beam subjected to large deflection.

关键词： strain gradient effect thin beam microscale uniaxial stress-strain curve

作者: Z.F.Shi B.Huang H.Tan Y.Huang T.Y.Zhang P.D.Wu K.C.Hwang H.Gao

作者单位: FML,Department of Engineering Mechanics，Tsinghua University,Beijing 100084,China Dept.of Mechanical Engineering,University of Science andTechnology,Hong Kong,China Dept.of Mechanical Science and Engineering,University of Illinois,Urbana,IL 61801,USA Dept.of Civil/Environmental Engineering and Dept.of Mechanical Engineering,Northwestern University,E Dept.of Mechanical Engineering,McMaster University,Hamilton,ON L8S 4L7,Canada. Division of Engineering,Brown University,Providence,R1 02912,USA

会议类型: 国际会议

会议名称: 第二届国际非均质材料力学会议(The Second International Conference on Heterogeneous Material Mechanics)

会议地点: 安徽黄山

会议语种:英文

页码: 275

在线出版日期: 2008-06-03（万方平台首次上网日期，不代表论文的发表时间）