Experiments with a New Machine for Testing Materials by Impact

Abstract
When stress is applied to a solid body, the material is distorted and a certain amount of work or energy is absorbed. The work thus absorbed in the deformation of the material is called resilience. If the stress changes from zero up to the elastic limit of the material, the energy absorbed during the change is the “elastic resilience” of the material. If the stress changes from zero up to the ultimate strength of the body, the energy absorbed is the “ultimate resilience” of the body. In the study of this subject it must be borne in mind that resilience is work, and hence depends upon two essential factors, force and distance acted through.

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