Mechanical engineering is an engineering discipline that applies the principles of physics and materials science for analysis, design, manufacturing, and maintenance of mechanical systems. This book presents current research in the field of mechanical engineering, including the fatigue and residual stresses during welding of titanium alloys; aircraft engineering and bird strike analysis; modelling to predict ultra-low cycle fatigue fracture of steel bridges; marine engine emissions and the fatigue behaviour of composites processed by resin transfer moulding processes.