金属导线在机械应变作用下发生电阻变化的现象称为应变/电阻效应。是开耳芬于1856年所发现的.电阴应变片的工作正是基于这种物理效应.一条长为L,初始电阻为Ro的金属丝.在力作用下长度变化若为△L,贝其电阻变化△R=Ro·G·(△L/L),式中△L/L=ε,称为应变,常用微应变(με)作单位 Metal wire under the effect of mechanical strain resistance change phenomenon known as the strain / resistance effect. Is the ear fingered found in 1856. Electro-mechanical strain gauge is based on this physical effect.A length of L, the initial resistance of the wire Ro.When the force changes in length if △ L, The resistance change △ R = Ro · G · (△ L / L), where △ L / L = ε, known as the strain, the common micro strain (με) for the unit