A. Andreykiv

Effect of Surface Geometry and Local Mechanical Environment on Periimplant Tissue Differentiation: A Finite Element Study.

Implant surface geometry, the amount of the soft tissue at the bone-implant interface and the type of loading can influence the course of bone ingrowth processes. These factors need to be taken into account during the design of a new prosthesis coating. However even animal experiments can not give a good insight into the environment at the bone-implant interface. One of the ways to understand why certain coatings perform better than the others is to perform a numerical simulation of the bone ingrowth process.

Re-entry Vehicle Design Optimization with Integrated Trajectory Uncertainties

In the present paper uncertainty-based design optimization of re-entry vehicles is investigated. The goal is to optimally design the Thermal Protection System (TPS) of a reentry vehicle to minimize the thermally induced deformations mismatch between adjacent parts of the TPS as the vehicle is heated during the re-entry. Uncertainties of different nature, typically originating from the vehicle configuration and the re-entry trajectory are considered in this work. The design approach is based on a bounded-but-unknown uncertainty optimization technique that assumes a continuous variation of both the design parameters and the uncertainties. The results of the proposed approach are compared with those of a deterministic approach, where the design is optimized for a nominal load profile.