Damage and Failure of Interfaces (Ed. H.P.Rossmanith), pp. 91-98, 1997
C.M. Chimani¹, H.J. Böhm¹, F.G. Rammerstorfer¹ and C. Hausmann²
¹Institute of Lightweight Structures and Aerospace
TU Wien, Vienna, Austria
²Swiss Federal Laboratories for Material Testing and Research,
At intersections between interface and free edges of multi material
structures complex tri-axial stress states occur which often are critical
with respect to damage.
In the following an axisymmetric component selectively reinforced with a
metal matrix composite is analyzed under thermal loading, special
consideration being given to the free edge effect.
When the stress fields are studied in terms of a bimaterial junction
problem using homogenized material descriptions singular stress fields are
An analytical method was utilized to improve the interface design with
respect to the free edge effect.
It employs the Airy stress function to set up the
corresponding boundary value problem, which is solved via the
Using a micromechanical approach it is then shown, that under certain conditions these theoretically derived stress singularities disappear when the inhomogeneous micro structure of a selectively reinforced component is accounted for explicitly.