Application of Digital Image Correlation to Measurement of Packaging Material Mechanical Properties

Table 2

Comparison of DIC with conventional methods.

Measurement	Features of DIC	Problems with conventional contact sensors (extensometers, strain gauges, etc.)
Operation mode	Noncontact	Contact	Slippage; Difficulty in attachment; Specimen may damage the sensor due to fracture
Object	All material; Large dimensions	Conventional material	Not applicable to special materials and small sample; Large samples require a lot of strain gauges
Range	Large range (several millimeters to meters)	Fixed	Easily exceed the range
Environment	High temperature, humidity, speed, and so forth	Normal	May not work in hostile environment
Direction	Any direction in plane, simultaneous multipoint measurement	Single	Need more strain gauges for different directions
Parameter	Displacement, distance, strain, velocity, acceleration, frequency, and so forth.	Single	Different instruments are needed for different parameters