the premature breakage in some four cylinder diesel engine crankshafts was reported. all crankshafts were failed from the same region. failures had occurred in the first crankpin, the nearest crankpin to the flywheel. dynamic analysis and finite element modelling were carried out to determine the state of stress in the crankshaft. fem results revealed that the first crankpin fillet is the most ...

The aim of this study was to investigate the effect of 50% hydrofluoric acid (HF) surface treatment on the cyclic fatigue resistance (CFR) of K3 NiTi instruments. Twenty as-received and twenty HF-treated K3 NiTi instruments were compared in CFR. The surface texture and fracture surface of two instrument groups were examined with a scanning electron microscope (SEM). Additionally, any change of ...

OBJECTIVE To assess compliance with current standards of playgrounds where children have sustained a fall-related arm fracture. DESIGN, SETTING AND PARTICIPANTS Between October 2000 and December 2002, a consecutive prospective series of 402 children aged under 13 years who fell from playground equipment and sustained an arm fracture was identified by emergency department staff in five Victori...