Comprehensive Analysis for Material Selection: Performance Evaluation for a Special Purpose Flexure

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Abstract Considering a cryocooler for space applications, a special type of a flexure spring is fitted to assist the compressor motor and a displacer for liner motion thereby removing vibrations, frictional losses, and wear & tear. In the context of the critical application, the important physical parameter i.e., fatigue life of the flexure spring matters the most so that cryocooler does not fail during the operation. The present research study is an attempt to analyze the vital factors and attributes to determining the suitable material for accomplishing finite-fatigue life for the special flexure spring. A comprehensive analysis for material selection was conducted using the material options viz. a] AISI 304 Stainless Steel b] Beryllium Copper UNSC17200 c] Grade 5 Titanium (Ti-6Al-4V-3.7165-R56400) and d] AMPCOLOY® 944. Further, the materials stated were compared to their respective S-N curves. To decode the flexure spring’s performance evaluation, the parameters viz. load stresses, stiffness, displacement, geometrical configuration, etc. were analyzed using the Finite Element Analysis (FEA) package.

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