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The effect of inertial loading in instrumented impact tests has been studied, and it is shown that during such tests large errors can be made in calculating the bending stress of a specimen at fracture if inertial loading is not taken into account. By instrumenting the tup, anvil, and specimen it is shown that in the period over which inertial effects occur, there is no simple relationship between the load measured on the tup, anvil, and specimen. To assist in interpretation and evaluation of impact load-time curves a model has been used which relates the spring constants and masses of the tup and anvil of the test machine and specimen to the frequency, phase, and relative amplitude of the oscillations occurring in the impact test. The importance of inertial loading is emphasized, in particular, with regard to dynamic measurement of plane strain fracture toughness KIc.

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