Development and Airworthiness Certification of the Ti6Al4V Inlet Casing Inner Forging

Vignesh P; Praveen KV; Krishna kumar S; Bhuvaneswari CM; Shirish Kale; Ram Prabhu T

doi:10.14429/dsj.74.18981

Vignesh P Centre for Military Airworthiness and Certification, Bangalore – 560017, India https://orcid.org/0000-0003-4487-2030
Praveen KV Centre for Military Airworthiness and Certification, Bangalore – 560017, India https://orcid.org/0009-0002-8559-4719
Krishna kumar S Centre for Military Airworthiness and Certification, Bangalore – 560017, India https://orcid.org/0009-0009-5860-0838
Bhuvaneswari CM Centre for Military Airworthiness and Certification, Bangalore – 560017, India https://orcid.org/0009-0006-9305-2812
Shirish Kale Centre for Military Airworthiness and Certification, Bangalore – 560017, India https://orcid.org/0009-0000-0672-3398
Ram Prabhu T Centre for Military Airworthiness and Certification, Bangalore – 560017, India https://orcid.org/0000-0002-1900-9692

DOI: https://doi.org/10.14429/dsj.74.18981

Keywords: Inlet casing inner, Ti-6Al-4V alloy, Closed die forging, Mechanical properties, Airworthiness certification

Abstract

The inlet casing inner has manufactured using Ti-6Al-4V alloy through a closed die-forging route. It undergoes
cyclic loads in addition to operating in extreme conditions in high-temperature environments. The demanding
mission requirement of these engines necessitates the inlet casing inner to be flawless throughout its life cycle
while retaining its structural integrity. It makes the qualification for airworthiness of the casing, a daunting task. In addition, the qualification tests also help to evaluate the design and manufacturing processes (closed die forging) of the inlet casing inner. The tests also provide data for further improvement of the inlet casing inner in terms of strength and fatigue life. It helps to ensure that the inlet casing inner will be able to perform as expected throughout its operational life. All the batch and consolidated test results comply with the relevant ASTM, MIL standards, and test schedule requirements.