Micro-mechanics of Ceramic-Whiskers

本文提出了一种测量微米级单丝抗拉强度的方法。该方法允许我们在光学显微镜观察下测量20至1500 mg范围内的拉伸载荷，精度约为1 mg。为了测量拉伸强度，从平行于样品轴拍摄的断裂表面的SEM显微照片估计样品的横截面积。通过比较在每个加载阶段拍摄的显微照片上标记物（即分布在样品上的微小晶须）的距离来计算Srtain。由此获得的沥青基各向同性碳丝的杨氏模量和拉伸强度分别为约60GPa和850MPa。

A method of measuring tensile strength of a filament with a diameter of mum order has been devised. The method allows us to measure the tensile load in the range of 20 to 1500mg with an accuracy of about 1 mg under optical-microscope observation. In oder to measure the tensile strength, the cross sectional area of the specimen is estimated from a SEM micrograph of the fractured surface taken parallel to the specimen axis. Srtain is calculated by comparing the distance of markers, i.e.tiny whiskers distributed on a specimen, on micrographs taken at each stage of loading. The Young's modulus and the tensile strength of a pitch-based isotropic carbon filament thus obtained were about 60GPa and 850MPa, respectively.