By E. Sommer (auth.), Klaus P. Herrmann, Lars Hannes Larsson (eds.)
This booklet includes the lectures of the fifth complex Seminar on Fracture Mechanics (ASFM five) held on the Joint learn Centre, Ispra, on 14-18 October 1985. The sequence of the ASFMs is without doubt one of the major usually scheduled overseas occasions subsidized by means of the ecu team on Fracture (EGF) , alternating with the ecu meetings of Fracture (ECFS). while ECFs are held in a unique position on even years (the final. ECF6,was in Amsterdam in June 1986), ASFMs are hosted on the JRC Ispra on ordinary years. This institution belonging to the fee of the eu groups plays study paintings of universal curiosity to the EC Member international locations. one of many actions of the JRC-Ispra is the association of Ispra-Courses aiming on the move of data and the strengthening of exchanges and ties among eu medical staff. ASFMs are designed to provide a sophisticated point remedy in chosen parts of fracture mechanics. past ASFMs have been dedicated to elastic-plastic fracture mechanics and to subcritical crack progress because of fatigue, tension corrosion and creep. within the early phases of coaching of ASFM5 it used to be determined to pay attention to a brand new subject matter, the fracture phenomena and fracture mechanics of non-metallic fabrics. while fracture mechanics begun with the examine of glass through Griffith, its later advancements founded predominantly on metal alloys. even though, in recent times non-metallic fabrics have stumbled on expanding makes use of and correspondingly efforts were made to strengthen trying out and prediction tools for those materials.
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Extra info for Fracture of Non-Metallic Materials: Proceeding of the 5th Advanced Seminar on Fracture Mechanics, Joint Research Centre, Ispra, Italy, 14–18 October 1985
The unloading behind the active plastic' zone may change the shape and the size of plastic and damaged zones. It does not change the manner in which the dissipation rate depends on K and K, as it can be shown by arguments based on the dimensions of the governing parameters. Therefore, for the mode I, the dissipation by plasticity (damage models)may be given by a similar formula Dp = AKiKI (18) - BKIKlh(KI ) where A and B are some constants of the material, and h may be a function of the load parameter in case of unsteady state propagation.
In recent works on local approaches to fracture, one focuses the discussion on the detailed analysis of the process zone, whose shape and size depend on the material property of the highly strained zone. The mathematical problem of determining the process zone turns out to be a cou21 K. P. Herrmann and L. H. ), Fracture of Non-Metallic Materials, 21-32. EEC, EAEC, Brussels-and,Luxembourg. © 1987 by ECSC, pled problem. In one hand, we have to consider damage theories for the process zone. In the other hand the boundary conditions are not prescribed on the contour of the process zone, but only on that of the entire body.
2. Irreversible strain in elastic-brittle material Micromechanics provide an interpretation of the irreversible strain which is often observed in tension loading of rocks and concrete . The irreversible strain observed after an elastic unloading cannot be explained by true plastic deformation of crystals. Nor can the friction between crack surfaces be invoked in the case of tensile loading. By studying the dissipation rate in the case where there exists an initial stress field a~(x) , the field a~ being a self-equilibrated micro-stress, it has been shown in  that there are two terms • D = 1(.