English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Packaging that is currently used for aero-engine precision bearings faces several issues, such as insufficient cushioning performance, insufficient sealing performance, and poor visibility. Herein, we propose a new method in which the bearings are fully covered with polydimethylsiloxane (PDMS). Samples were prepared for tensile and moisture-permeability tests according to the optimum ratio 10:1 (PDMS: Curing agent) of PDMS provided in the literature. The stress and strain curves of PDMS were then obtained via the tensile test. Additionally, the permeability of a polyethylene/polyamide composite film (the packaging material currently used) and PDMS were compared via a moisture-permeability test. According to the test results, the cushioning coefficient of silicone was 1.9, and the minimum thickness of the pad was 12 mm. Using a finite-element software, the bearing stress of the buffer pad was compared for thicknesses of 7, 12, 17, and 22 mm. The simulation results indicated that the liner with a pad thickness of 12 mm provided the optimal protection and economy. According to the simulation results, the precision bearing is packed in such a manner that it is fully enclosed, and the suitability of the proposed method wherein the PDMS material is used as a cushion pad was verified by simulating a drop test of the product during transportation. When the thickness of the PDMS cushion was 12 mm, the shock acceleration of the bearing was <1100 m/s2. Thus, the proposed method can successfully protect aero-engine precision bearings.

Protection Performance of New Polydimethylsiloxane Packaging Method for Aero-Engine Precision Bearings