Enhanced-strength, Thermally-stable, Edge-bonded, Composite Joints, Phase I

Metadata Updated: February 28, 2019

This project proposes to develop/demonstrate higher strength, low print-through, low mass, discrete core joint design and analysis method for large, lightweight, thermally-stable, composite sub-mm reflectors. Two SMLS reflector demonstrators delivered by Vanguard to JPL were optimized for thermal stability and specific stiffness. The full aperture was divided into three zones where core slots are aligned approximately perpendicular to the reflector skin. This approach was defined and selected based on: 1) a baseline core module; 2) CTE test data indicates the core laminate is anisotropic; and 3) the desire to reduce temperature induced astigmatism by use of alternating core slots. Discrete ribs were bonded up to +/-30° from the front facesheet. The project will evaluate and mature the SMLS design for NASA and JPL. Design modifications will be identified and demonstrated to preserve/improve the previously demonstrated thermal stability and stiffness. Lightweight, thermally stable, low-cost laminate designs, adhesive materials, and manufacturing methods are required to adequately strengthen rib-to-facesheet butt joints and redistribute local rib-to-facesheet loads. To minimize impact to existing SMLS' demonstration reflector mass and thermal stability, development of a novel, supplementary modular rib/clip and joining method is envisioned.
The proposed approach will require finite element analyses, design activities, coupon tests, and model-to-test data correlation. Analyses will include modal, acoustic response, and strength evaluation. Potential mass reduction opportunities will be identified. Existing coupon failure modes will be evaluated and lessons learned applied to enhanced strength joint concepts. Previous demonstration reflector thermal distortion test results and correlation activities will be reviewed to reduce model uncertainty and evaluate the influence of the several types of rib/clip joints on figure change due to temperature soak.

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Public: This dataset is intended for public access and use. License: U.S. Government Work

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Metadata Created Date August 1, 2018
Metadata Updated Date February 28, 2019

Metadata Source

Harvested from NASA Data.json

Additional Metadata

Resource Type Dataset
Metadata Created Date August 1, 2018
Metadata Updated Date February 28, 2019
Publisher Space Technology Mission Directorate
Unique Identifier TECHPORT_18460
Maintainer Email
Public Access Level public
Bureau Code 026:00
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Metadata Catalog ID https://data.nasa.gov/data.json
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Harvest Object Id a0303cf9-3d7f-4204-8d4e-0b1e1a44e35b
Harvest Source Id 39e4ad2a-47ca-4507-8258-852babd0fd99
Harvest Source Title NASA Data.json
Data First Published 2014-12-01
Homepage URL https://techport.nasa.gov/view/18460
License http://www.usa.gov/publicdomain/label/1.0/
Data Last Modified 2018-07-19
Program Code 026:027
Source Datajson Identifier True
Source Hash 116346d3533925518f6fbe1ac658bfc40e18a3a6
Source Schema Version 1.1

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