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Chapter 5
Assemble the load string
• Select a load cell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
• Before you begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
• Install the load cell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
• Adapters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
• Coupling adapters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
• Select Grips and Fixtures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
• Preload the load string . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
• Unload the load string. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
The load string consists of all the hardware components between the crosshead and the
base of the testing machine. It includes the load cell, grips, the specimen and any
adapters that let you connect any of these components together.
Instron
®
Service sets up the testing machine during installation, but you may need to
change one or more of these components for different types of testing.
When creating a load string, keep in mind the maximum capacity for all the components
making up the load string. The expected test load should not exceedthe maximum
capacity of any load string components including, but not limited to:
• load frame
• load cell
• adapters
• grips or fixtures
Select a load cell
If you know the approximate tensile or compressive strength of the material that you are
testing, use these guidelines to choose a load cell:
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