Core concepts and considerations for accurate DIC measurements. Topics include selecting appropriate subset sizes, step sizes, and strain filters; understanding projection error and strain tensor formulations; avoiding pitfalls when averaging angular data; validating DIC results against strain gauges; and optimizing hardware setup through proper lens selection and stereo angle configuration.
When comparing strain values obtained from DIC to analytical results or to strain results obtained from other measurement methods, it's important to select the strain tensor which matches your expecte...
Introduction When running a correlation in Vic-3D, one of the values given for each image is the Projection error. This article will explain how the projection error is calculated and what can cause a...
Summary and Overview Here we will discuss subset size, step size and strain filter selection. In short, you want your subset to be larger than your speckle sizes and for most applications your step s...
In digital image correlation, the quality of the data is often dependent on the quality of the speckle pattern. Using an optimal speckle pattern is one of the most important factors in reducing measu...
INTERPRETING 2D DIC DATA Why does my strain or displacement data not match theory or other measuring techniques? INTRODUCTION Digital Image Correlation (DIC) data is often used as a validation method,...
System Specs Many things in our test set-up can affect our noise and resolution, but with a good setup, the following rules of thumb can be applied to estimate what type of noise and resolution you ca...
INTERPRETING 3D DIC DATA Why does my strain or displacement data not match theory or other measuring techniques? INTRODUCTION Digital Image Correlation (DIC) data is often used as a validation meth...
Generally speaking, there are not many rules to setting up cameras, such as the stereo angle between cameras and lens selection because the calibration calculates all the parameters, such as stereo an...
Vic 2D Applications In order for a setup to be a good 2D application (with just one camera), the specimen must be: Specimen must be flat Specimen must be planar to camera sensor No part of th...
Overview When heat sources or hot surfaces are present in a DIC testing setup, refractive heat waves may distort your image; this distortion is not always apparent but it can create major errors in yo...