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Contact caustics measurements expanded to anisotropic materials

Bakic A., Semenski D., Jecic S.

Archives of Civil and Mechanical Engineering

2011

Vol. 11, no 3

497-505

Regions with high stress gradients represent critical zones of engineering structures, such as crack tip or vicinity of the contact zone. The optical method of caustics is one of the few experimental methods which provide applicable results in these locations. This method was originally developed for crack-tip measurements of stress intensity factors and J-integral for isotropic and then for anisotropic materials. Subsequently, it was extended to the contact problems, where the size and the shape of caustics are related to the amount and the inclination of loading force. Here, the application of the method of caustics is extended to the analysis of contact problems for mechanically anisotropic materials. This makes the caustics method widely applicable to the analysis of any high stress gradient locations in a structure.

Obszary z dużym gradientem naprężeń jak wierzchołki pęknięć oraz miejsca kontaktu są krytyczne dla konstrukcji inżynierskich. Optyczna metoda Caustic jest jedyną z kilku metod dostarczających informacji o tych obszarach. Metoda ta została rozwinięta w celu badania wierzchołka pęknięć, następnie adaptowana dla problemów kontaktowych. W pracy przedstawiono zastosowania tej metody do analizy problemów kontaktowych materiałów anizotropowych.

Photoelastic investigation of mechanical problems in applying acetabulum cups to hip prosthesis

Beer R., Eberhardsteiner J., Kodvani J., Jecic S.

Acta of Bioengineering and Biomechanics

2006

Vol. 8, nr 1

47-54

Acetabulum cups are the counterparts of endoprostheses, which are mounted in the pelvis. There are different designs of such cups. They differ in their form and in the way of mounting. This paper deals with the threaded acetabulum cups with conical shape mounted in the pelvis. In general, one has to distinguish between stresses caused by the mounting process and lifetime stresses of the mounted cup. Stresses remaining of the mounting must ensure the so-called primary stability; however, they will disappear to some degree due to rheological properties of bone. The question arises whether the mounting stresses are responsible for local plastic deformations and the corresponding residual stresses or not. In this paper, mostly loading stresses and their dependence on the contact properties between pelvis and cup or between cup and polyurethane inlay are considered.