impact testing methods

impact testing methods

Impact Testing

Impact testing is a well established method of measuring a samples ability to withstand high strain-rate loading. It determines the amount of energy which can be absorbed by a material before a fracture event or plastic deformation occurs. It also gives information on the effect of cyclic loading on the properties of materials. Traditionally, such tests have been carried out on the macro-scale. While qualitatively these tests can be informative, they lack detailed quantitative information, and also result in destruction of the sample. Furthermore, macro scale method of impact testing requires bulk samples and sufficient sample preparation.
Impact Testing on the Nano-Scale
Impact testing on the nano-scale can overcome all of these limitations. It gives valuable quantitative data on the performance of the sample, and impact sites are small enough to be classed as non-destructive. This means that the mechanical properties of a sample are not compromised, thus allowing it to go on to be tested by other complimentary means such as nanoindentation or nanoscratch testing. Sample size is limited only by the practicality of handling the sample. Highly localised individual structures of sizes in the order of microns may be targeted successfully. Automation enables repetitive impacts at the same position on the sample surface with a set frequency. Information such as cycles and time to failure can easily be obtained.