This paper investigates a new mathematical model of static frictional contact for an ideally locking piezoelectric material with electrical and thermal conductivity conditions. A variational formulation the is derived, in form coupled system displacements, electric potential temperature. The existence unique weak solution established its proof based on Tychonoff fixed point theorem multivalued ...

INTRODUCTION Immediate weight-bearing following osteosynthesis of proximal tibial fractures is traditionally not allowed due to fear of articular fracture collapse. Anatomically shaped locking plates with sub-articular screws could improve stability and allow greater loading forces. The purpose of this study was to investigate if immediate weight-bearing can be allowed following locking plate o...

OBJECTIVE The purpose of this study is to assess the need to lock the Gamma 3 nail (Stryker, Mahwah New Jersey USA) distally for intertrochanteric fractures of femur 31-A1 and 31-A2 of the AO. MATERIAL AND METHODS Details were recorded on a sample of 177 patients with intertrochanteric femoral fractures treated in our hospital by a standard Gamma nail between June 2011 and January 2013. A pro...

Due to the influence of peculiar material characteristics, austenitic stainless steel bolts are always easy be locked during disassembly. This is not only seriously affected service performance bolts, but also affects reuse bolts. In this paper, main causes and mechanism locking blots in process fastening summarized, effective measures containing correct selection, carefully clean before assemb...

Locking devices are widely used in robotics, for instance to lock springs, joints or to reconfigure robots. This review paper classifies the locking devices currently described in literature and preforms a comparative study. Designers can therefore better determine which locking device best matches the needs of their application. The locking devices are divided into three main categories based ...

The simulation of incompressible materials suffers from locking when using the standard finite element method (FEM) and coarse linear tetrahedral meshes. Locking increases as Poisson ratio ν gets close to 0.5 often lower values are used reduce locking, affecting volume preservation. We propose a novel mixed FEM approach simulating solids that alleviates problem for tetrahedra. Our uses shape fu...

BACKGROUND Surgical managements were recommended for unstable distal clavicle fracture owing to the high incidence of nonunion. The present study compared the efficacy of anatomical locking plate with versus without additional suture anchor fixation for the treatment of unstable Neer type II distal clavicle fractures. MATERIAL AND METHODS Between January 2013 to January 2015, 28 consecutive pat...

A safe and deadlock free lock policy is introduced, called pre-analysis locking. Pre-analysis locking is based on an efficient geometric algorithm which inserts lock and unlock operations into the transactions. Pre-analysis locking is the first safe and deadlock free general locking policy which is not a variant of two-phase locking. It is an approach conceptually different from policies follow...

We consider the design of robust elements that can be used in hp codes for elasticity problems. Our goal is to identify an element that is free of locking for the case of a nearly incompressible material, both in terms of the h version and the p version. By this we mean that the displacements as well as the stresses should converge optimally. For the standard nite element method, locking is obs...