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Mechanical and medical aspects of an implant-bone connection in the femur: A three-dimensional photoelastic study of the load transfer mechanism using gamma radiation for fixing the experimental information. Comparison of two solutions of femur prosthesi

100%

Beer R. J. , Eberhardsteiner J. , Kodvanj J. , Grienauer W. , Gottsauner-Wolf F. , Skrbensky G.

tom Vol. 2, nr 2

25-31

The investigation of the implant-bone connection is of significant surgical interest as the postoperative course is influenced by the primary stability of the connection. It is necessary to achieve primary stability, so that the patient can be mobilized as soon as possible without any additional orthopaedic treatment. The achievement of the so-called secondary (longtime) stability through an ingrowth of bone is only possible if a perfect fixation of the implant is reached during surgical treatment. In this paper two different types of prosthesis, called Viennese and Bologna models are investigated. The reason for this investigation is given by the fact that these two types present two different fixing techniques developed for long bones. The main difference between the two solutions is given by the kind of implantation and its influence on the stress distribution in the load transfer area. In suitable models the stresses in the close vicinity of the load transfer areas are compared in both implant types using suitable photoelastic models.

Rivet flexibility and load transmission for a riveted lap joint

94%

Skorupa M. , Machniewicz T. , Korbel A. , Skorupa A. , Skorupa M. , Machniewicz T. , Korbel A. , Skorupa A.

nr 3

Load transfer by fine threading the implant neck - a FEM study

84%

Rahimi A. , Bourauel C. , Jager A. , Gedrange T. , Heinemann F.

nr 8

107-112

Experimental and theoretical research on large-diameter rock-socketed pile embedded depth

59%

Li Y. , Zhao J. , Xiong Y. , Wang Q.

2021

tom Vol. 67, nr 2

537--550

A theoretical formula for large-diameter rock-socket depth is developed to support pail embedding in a large bridge pile foundation project. There is a horizontal additional stress concentration at the place where the soil around the rock-socketed pile meets the soil layer under the horizontal load. When the rock-socketed tip stress and bending moment of the pile are relatively small, the pile shows favourable embedment effect and the pile foundation can be considered safe. The function curve of soil resistance around the pile under the action of horizontal force was obtained by finite element analysis. The force characteristics reveal the depth of the largediameter rock-socketed pile under the horizontal load. As the rock-socketed pile rotates under the action of horizontal force, the rock mass resistance around the pile changes according to the cosine. The distribution of pileside soil resistance is proportional to the displacement and distributed according to the sine. A comprehensive correction coefficient of pile shaft resistance β is introduced to deduce the theoretical formula of the depth hr of the large-diameter rock-socketed pile embedded in the bedrock. It is verified through both experiments and numerical analysis.