High-cycle fatigue (HCF), involving the premature initiation and/or rapid propagation of small cracks to failure due to high-frequency cyclic loading, has been identified as one of the leading causes of turbine engine failures in aircraft. In this work, we consider the feasibility of using grain-boundary engineering to improve the HCF properties of a polycrystalline nickel-base superalloy, René...

In this paper, it is proposed to study the static flexural performance of hybrid (glass and steel) fiber reinforced M30 grade self-compacting concrete (SCC) beams made with glass reinforcement polymer (GFRP) re-bars. Nan Su mix design approach adopted develop plain SCC (PSCC) mixes. Glass fibre (GFRSCC), steel (GFRSCC) (HFRSCC) mixes are prepared using optimum dosages (0.05%) fibres (1%) by vol...

The previously developed eigenvalue method for computing the size effect of cohesive crack model is extended to the cohesive crack model with a finite residual stress. In this model, the structure size for which a specified relative length of kink-band corresponds to the maximum load is obtained as an eigenvalue of a homogeneous Fredholm integral equation. This new method is direct and much mor...

A B S T R A C T Pump shafts used for power generation are susceptible to fatigue cracking while often in near-continuous operation. Technology based on torsional vibration is under development for condition-based assessment of shaft health. The focus of this paper is on the relationship between a crack, which propagated due to bending loads, and the torsional stiffness of the shaft. An analytic...

Owing to the production process, short fiber reinforced composites exhibit a pronounced anisotropy of both elastic properties and crack growth resistance. In particular latter issue has major impact on deflection inevitably be taken into account for sake an accurate prediction paths. The perpendicular axes transverse isotropy are associated with orientations, whereupon in direction encounters l...

In this thesis, an analytical tool for predicting fatigue performances of RC bridge slabs isdeveloped based on the concept of fracture mechanics. The degradation of bridging stress in thenormal direction of concrete cracks is considered as a primary mechanism for the propagation ofboth flexural cracks and shear cracks that induce the failure of RC slabs. The analysis of RC slabs...

Catastrophic failure of any brittle structure under dynamic loading consists of dynamic crack initiation, propagation, curving, branching (both micro and macro) and branching instability. However, the failure is much more complex in case of layered materials which has interfaces. In these materials, other than above crack mechanisms the crack can also deflect to propagate along the interface or...