The measurement of displacement in fracture toughness tests is generally accomplished using clip gages. This paper describes an experimental study to examine the performance of a number of clip gages. It is shown that double cantilever clip gages exhibit a non-linear response. The degree of non-linearity is shown to vary with temperature. In relation to fracture mechanics test methods it is demonstrated that in some instances relaxation of the test standards is required to-encompass the gage performance. Where data can be stored digitally, the non-linear response can be accounted for using a third-order polynomial calibration. An analytical study shows that the non-linearity is inherent for the large displacements often incurred in fracture mechanics tests.
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