Method of determining the impact fracture toughness K.sub.ID by

Details Method of determining the impact fracture toughness K.sub.ID by Method of determining the impact fracture toughness K.sub.ID by

1981-11-13

1983-12-06

Birmiel, Howard A.

Measuring and testing

Testing by impact or shock

Specimen impactor detail

73799, 73844, G01N 308

Patent

active

044185634

ABSTRACT:
A method of determining the impact fracture toughness K.sub.id of construction materials, for example structural steels or plastic materials, without the need of performing a load measurement at the striking hammer is provided. The elastic response of the specimen to the impact process, i.e. the dynamic stress intensity factor versus time curve, K.sub.I.sup.dyn (t), is determined in pre-experiments. The shadow optical method of caustics in reflection with an appropriate high strength steel is utilized for establishing this impact response curve. The dynamic fracture toughness for a given constructional material is then determined by performing an impact experiment and measuring the time to fracture t.sub.f. K.sub.Id is obtained from the measured t.sub.f -value and the pre-established impact response curve which corresponds to the experimental test conditions. The presented measuring procedure is used for determining the dynamic fracture toughness of two different steels at different test temperatures.

REFERENCES:
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patent: 3583215 (1971-06-01), Franz
patent: 4085609 (1978-04-01), Kelly
Ireland, D. R. (1976), "Critical Review of Instrumented Impact Testing", Proc. Int. Conf. Dynamic Fracture Toughness, London.
Glover, A. P., F. A. Johnson, J. C. Radon and C. E. Turner (1976), "Dynamic Fracture Toughness Measurement by Instrumented Impact Bend Testing and Compact K Testing", Proc. Int. Conf. Dynamic Fracture Toughness, London.
Winkler, S., J. F. Kalthoff and A. Gerscha (1979), "The Response of Pressure Vessel Steel Specimens on Drop Weight Loading", Proc. 5th Int. Conf. on Structure Mechanics in Reactor Technology, Berlin, vol. G (4/6), North-Holland Publishing Company.
IIW (International Institute of Welding, Commission X), U.K. Briefing Group on Dynamic Testing (1976) "Some Porposals for Dynamic Toughness Measurement", Proc. Int. Conf. Dynamic Fracture Toughness, London.
Kalthoff, J. F., J. Beinert, and S. Winkler (1977), "Measurements of Dynamic Sress Intensity Factors for Fast Running and Arresting Cracks in Double-Cantilever-Beam Specimens", ASTM STP 627-East Fracture and Crack Arrest, American Society for Testing and Materials, Philadelphia, pp. 161-176.

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