EXTENSOMETERS
2.4
The precise measurement or control of specimen deformation is a fundamental requirement in many materials tests. The use of crosshead or actuator movement to derive specimen deformation is often employed, but accuracy is limited by external influences such as system compliance and specimen deformation outside the nominal gauge length (in the tab ends for example). Extensometry provides a direct and accurate method for measuring and controlling specimen deformation by monitoring strain over a precisely defined gauge length. Instron extensometry range includes many different types of extensometers to suit various specimens and applications. Each one is designed to provide the best possible accuracy. Instron has designed many custom extensometers and will discuss your extensometry requirements should you be unable to find a suitable device in the following pages. ®
Automatic Extensometers
90
Biaxial Automatic Extensometer
91
Averaging Axial Clip-On Extensometers
92-93
Dynamic Axial Clip-On Extensometers 94 Static Axial Clip-On Extensometers
95-98
LVDT Non-Separable Axial Clip-On Extensometers
99-100
Biaxial Clip-On Extensometers
101
Connecting Cables for Extensometers 102 Crack Opening Displacement (COD) Gauges
103
Deflectometers
104-105
Deflectometer Accessories
106
High-Temperature Extensometers
107-109
Long-Travel Extensometers
110
Non-Contacting Video Extensometers 111-112 Digital Image Correlation
113-114
Knife Edges, Clips and Parts for Extensometers
115
Transverse Clip-On Extensometers
116
