Abstract
The determination of the dynamic response of titanium alloys is vital for aerospace industrial applications. The present research investigates the effect of strain history and temperature on the dynamic strain localization in Ti-6Al-4V grade-5 alloy. The experimental campaign was conducted using a Split Hopkinson Tensile Bar (SHTB) equipped with an ultra-highspeed camera. The characterization of the material is highly affected once necking occurs. The true dynamic response is compared for various loading conditions. Furthermore, in order to provide insights about on the local dynamic behavior, a numerical model is established using LSDYNAExplicit solver for monotonic loading conditions. Different constitutive material models are compared, including the phenomenological material model Johnson-Cook, and physically based model, Modified BammanChiesa-Johnson (BCJ).
Highlights
With their high strength to weight ratio coupled with high corrosion resistance, have been popular for the design of aviation engine components such as fan blades and casings
A numerical analysis has been performed using the LSDYNA-Explicit® solver for monotonic loading conditions, where different materials models were assessed and compared
The numerical analysis will be used to examine the stress state of the necked zone to evaluate the effect of the pre-straining on the true stress and strain, and additional experimental work is underway to evaluate these models under different temperatures and amounts of pre-strain, including investigation into the potential void growth damage mechanism under these different conditions
Summary
With their high strength to weight ratio coupled with high corrosion resistance, have been popular for the design of aviation engine components such as fan blades and casings. Ti-alloys contribute 25% of the overall weight of modern jet engines in the form of outer casing, fan blades, and low-pressure compressor [1]. Dynamic events such as bird strike and blade release require the understanding of the behaviour of lightweight engineering materials at high rates of deformation. In the dynamic loading condition, the necking becomes substantially localised and approximation of the true stress and true strain. It is only possible by measuring precise measurements of the diameter evolution. The evolution of nominal and effective strain rates was measured and compared using digital image correlation. A numerical analysis has been performed using the LSDYNA-Explicit® solver for monotonic loading conditions, where different materials models were assessed and compared
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