Abstract The incorporation of the saturation tangential contact stress with increase normal is required for analysis friction phenomenon solids and structures subjected to a high stress, which cannot be described by Coulomb condition, in increases linearly stress. In this article, subloading-friction model, capable describing smooth elastic—plastic transition, static—kinetic recovery static dur...

BACKGROUND The Bernese periacetabular osteotomy is used in dysplastic hips to increase the load-bearing area of the hip and to prevent osteoarthritis. The aim of our work was to determine the contact hip stress before and after the osteotomy and to compare the relief of stress with the long-term radiographic and clinical outcome. PATIENTS AND METHODS We followed 26 dysplastic hips (26 patient...

In order to reduce the failure probability of rubber sealing rings in reciprocating dynamic seal, a new structure of sealing ring based on bionics was designed. The biomimetic ring has three concave ridges and convex bulges on each side which are very similar to earthworms. Bulges were circularly designed and sealing performances of the biomimetic ring in both static seal and dynamic seal were ...

OBJECTIVE The purpose of this study was to develop a model that accurately represents the interface between bone and basal implants throughout the healing process. STUDY DESIGN The model was applied to the biological scenario of changing load distribution in a basal implant system over time. We did this through finite element analysis (FEA, or finite element method [FEM]), using multiple mode...

BACKGROUND Modeling neo-aortic valve for arterial switch surgical planning to simulate the neo-aortic valve closure performance. METHODS We created five geometrical models of neo-aortic valve, namely model A, model B, model C, model D and model E with different size of sinotubular junction or sinus. The nodes at the ends of aorta and left ventricle duct fixed all the degrees of freedom. Trans...

The hip contact stress is considered an important factor influencing the development of the hip joint cartilage [1]. The hip contact stress has been measured using several approaches and also estimated on the basis of mathematical models [2,3]. A detailed description of various methods for measurement and estimation of contact stress distribution can be found in Brand et al, 2002 and Brand, 200...

In this paper, a numerical study is conducted to investigate the stress shadow effects (stress reorientation and change) during hydraulic fracturing in a transverse multiple fracture system. A numerical model is used for the numerical study. It is a 3D model and can simulate the fracture operation from injection begin to full closure (fracture contact). Therefore, there is no need to assume the...