System compliance and stiffness can impact results. When significantly high forces are expected, systems with inadequate frame stiffness are susceptible to absorbing energy from a specimen during testing and transferring it back into the specimen, which results in premature failure. At lower forces, compliance or elastic ‘give’ becomes more of an issue. When compliance is not corrected or dealt with appropriately, load and extension data may not be entirely representative of the material being tested.
Solution: When stiffness is important, using an appropriate testing system is critical. Stiffer testing frames will reduce system compliance. For overall compliance consider grips, fixtures, and adaptors.
Tip: The most effective way of eliminating the effect of compliance on test results is by using a strain measuring device, such as an extensometer, which can be attached directly to the specimen.
Solution: When stiffness is important, using an appropriate testing system is critical. Stiffer testing frames will reduce system compliance. For overall compliance consider grips, fixtures, and adaptors.
Tip: The most effective way of eliminating the effect of compliance on test results is by using a strain measuring device, such as an extensometer, which can be attached directly to the specimen.
No comments:
Post a Comment