Ratcheting fatigue behaviour of advanced structural materials at their service temperatures.

Ratcheting fatigue behavior is a critical phenomenon in structural materials undergoing cyclic loading, particularly when combined with nonzero mean stress or multiaxial stress states. This manifests as the progressive buildup of plastic strain in one direction with each loading cycle, ultimately leading to material degradation and failure. This behavior is highly relevant in industries such as automotive, aerospace, nuclear, and civil engineering, where components frequently experience complex loading conditions.

Performance analysis of biofuel-ethanol blends in diesel engine and its validation with computational fluid dynamics.

The engine tests aimed to produce comparable data for fuel consumption, exhaust emissions, and thermal efficiency. The computational fluid dynamics (CFD) program FLUENT was used to simulate the combustion parameters of a direct injection diesel engine. In-cylinder turbulence is controlled using the RNG k-model.