Flexure and pressure-loading effects on the performance of structure–battery composite beams
Abstract
The effects of sustained three-point bend loading and hydrostatic pressure on the mechanical and energy-storage performance of three structure–battery beam prototypes were experimentally investigated. The SB beams, designed for unmanned underwater vehicle applications, were fabricated using marine-grade structural composite constituents and commercial rechargeable lithium-ion “pouch” cells. Low-temperature cure materials and multistep processing were used in fabrication to avoid exposing the cells to temperatures above 60℃. The results showed load relaxation (up to 6–18%) under constant displacement three-point bending within the elastic regime due to viscoelastic shear in adhesive bond layers between components and lamina. Concurrent cell charge–discharge during sustained load bending had a small effect on the load (∼1% change or less). Energy storage capacity under hydrostatic pressures up to 2 MPa, equivalent to 200 m ocean depth, showed a 6–8% decrease in capacity. The results highlighted the need for some design changes to improve structure–battery component performance including: exclusive use of high-temperature cure resins (epoxy or vinyl ester) to improve structural performance and enable single-step fabrication, and transverse (fiber) reinforcement to strengthen the interlayer bonds and embedded cell pockets to minimize load relaxation effects and maximize component bending strength.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 12, 2018
- Source ID
- 10.1177/0021998318810856
Entities
People
- Giang T Pham
- James P. Thomas
- Siddiq M Qidwai
- William R. Pogue Iii
Organizations
- Division of Civil, Mechanical & Manufacturing Innovation
- National Science Foundation
- United States Naval Research Laboratory