在CorelDRAW平台上进行Fry法有限应变测量的新技术

有限应变测量是韧性变形定量估算的主要手段。Fry法有限应变测量以变形颗粒，如变形砾石、鲕粒、近等轴矿物等为应变标志体，地质实践中较容易获得，是岩石有限应变测量的最普遍手段。其传统测量过程极为繁琐，难以满足大范围应变测量的要求，数据精度也较低，限制了Fry法的应用。前人曾根据Fry法原理设计了计算机程序，但其程序相关编程语言如今已基本不能使用。本研究基于目前地质上较普遍使用的制图软件CorelDRAW平台的VBA编程，设计出一个基于CorelDRAW平台的Fry法应变测量宏程序FRY-1。在新图层上将所有变形颗粒的中心点标出后，运行FRY-1宏程序即可快速得到精确的Fry图解，并计算出相对精确的R值。通过实例与“最邻近心对心法”的测量结果进行的对比，证明该方法简便易操作，并可大幅提高有限应变测量的效率和有效减小误差。

A New Solution for Finite Strain Measurement by Fry Method in the CorelDRAW Platform

Finite strain measurement is a major means to estimate quantity ductile deformation. Fry method, using deformed grains such as deformed gravels, oolites and rounded or sub-rounded crystals which can be easily identified in the field and labs as strain markers, is a commonly used means of finite strain measurement. The traditional process of this method is notoriously time-consuming, which prevents it from widely-using. Associated computer programs have been designed previously, but the related machine languages are already out of date. CorelDRAW is a widely-used drawing software, the updated version of which provides VBA for designing Macro-programs. This paper reports a macro-program on CorelDRAW platform, the Program FRY-1, for finite strain measurement of Fry method. This program will help us to rapidly obtain the value of R (long/short axes ratio) and the direction of the longer axle of strain ellipsoid with much higher precision. The efficiency and accuracy of this method are testified by comparing the result with that by the “neighbor center-to-center ” method.