| Popis: |
In mechanical-impact tests, the potential energy of the plummet is divided between energy absorbed by the specimen, the plummet's kinetic energy of rebound, and various losses in the test machine. Thus, all of the potential (or drop height) energy is not transferred to the specimen. The fracture and deformation characteristics and the reactability of metal specimens are dependent on the amount of energy that the specimen absorbs. The absorbed energy may be calculated either from knowledge of the potential energy and rebound height (assuming losses are negligible), or from the depth of striker-pin penetration into the specimen. The depth measurement gives an estimate of specimen strain; an estimate of force exerted on the specimen during deformation allows calculation of the work of deformation. The effects of the absorbed energy on fracture and deformation characteristics and on reactions in Al-Li alloys and alloy 2219 are discussed. |
