Development of ultra micro-displacement using micro-coiled carbon fiber

在用光学显微镜进行的拉伸实验中，载荷是按重量施加的，在我们的实验中是一块盖子玻璃。重量被连接到螺旋碳的一端，而螺旋碳的另一端是固定的。通过将光学显微镜与显微镜工作台一起逐渐倾斜，我们观察到重量在试件上滑动。在40ﾟ和50ﾟ的倾角下，我们用光学显微镜精确测量了卷曲碳的伸长率。材料的剪切模数G由64nr^4w/d^4增量给出，其中d是纤维直径，r是线圈半径，增量是伸长量，n是圈数。计算得到缠绕碳纤维的剪切模数G=85 GPA，体积电阻率随体积密度的不同在1.0-0.2OMEGAcm之间。另一方面，测量了长约1 mm、线圈直径约8微米、纤维直径约2微米的碳线圈的电阻率。计算得到纤维的电阻率为1.09×10~(-2)OMEGAcm。

In the tensile sxperiments using an optical microscope, load was applied by a weight, which was a piece of cover glass in our experiments. The weight was connected to one end of a coiled carbon, of which the other end was fixed. BY inclining the optical microscope gradually together with the microscope stage, we observed that the weight slid on the specimen. We took accurate measurements of the coiled carbon elongations from optical micrographs at inclination angles of 40ﾟ and 50ﾟ.The shear modulus G of the material is given by 64nr^4w/d^4delta where, d is the fiber diameter, r the coil radius, delta the amount of elongation and n the number of turns. The calculated shear modulus of the coiled carbon fiber is G=85 GPa.The bulk electrical resistivity of the carbon coils was 1.0-0.2OMEGAcm depending on the bulk density. On the oter hand, the electrical resistivity on one carbon coil which is about 1mm in length, 8mum in coil diameter and 2mum in fiber diameter. The calculated electrical resistivity of the fiber was 1.09*10^<-2>OMEGAcm.