Accession Number : ADP003102

Title :   On Some Current Problems in Experimental Fracture Dynamics,


Personal Author(s) : Kalthoff,J. F.

Report Date : OCT 1983

Pagination or Media Count : 25

Abstract : The term fracture dynamics includes both crack tip motion effects and dynamic loading of cracks. Based on the research work at the Fraunhofer-Institut fur Werkstoffmechanik (IWM) several topics are discussed regarding the subjects crack propagation, arrest of fact running cracks, time dependent loading in general, and loading of cracks by sharp stress pulses of short duration. Following the guidelines of the workshop, previous results are briefly summarized to state the current situation, but special consideration is given to still open questions and problems not yet resolved. Most experimental data reported in this paper have been generated by means of the shadow optical method of caustics. The caustics technique is an optical tool for measuring stress intensifications. The method has been applied very successfully in the field of fracture mechanics for determining stress intensity factors. Crack tip caustics are of a simple form and can easily be evaluated. The technique, therefore, is very well suited for investigating complex fracture problems, as for example in fracture dynamics.

Descriptors :   *Materials, *Steel, *Fracture(Mechanics), *Crack propagation, *Dynamics, Front ends and surfaces, Stress concentration, Test methods, Caustics, Impact tests, Optics, Time dependence, Stability, Aluminum, Epoxy resins, Equations, Experimental data, Mechanical properties, High strength, Dynamic loads, Energy transfer, Graphs, Microstructure, Finite element analysis, Symposia

Distribution Statement : APPROVED FOR PUBLIC RELEASE