# Theoretical Investigation of Stiffness and Vibration Frequency Enhancement in Novel Membrane-Wrapped Lattice Beams

## TL;DR

This paper proposes a new lattice beam design wrapped in a thin metallic membrane to significantly increase stiffness and vibration frequency for aerospace applications.

## Contribution

The novel Membrane-Wrapped Lattice design and its theoretical framework for stiffness and frequency enhancement are introduced.

## Key findings

- A 50 μm stainless steel membrane increases flexural stiffness by 128%.
- Natural frequency increases by 85% with membrane wrapping.
- Experimental results match theoretical predictions closely.

## Abstract

Bending-dominated lattice structures offer superior stability but suffer from low stiffness and natural frequencies, posing resonance risks in aerospace applications. To address this, a novel Membrane-Wrapped Lattice (MWL) encapsulated by a micrometer-scale metallic film is proposed. A theoretical framework based on the tension-compression asymmetry of the membrane is established to analyze the influence of membrane thickness on the neutral axis shift, ultimately deriving analytical formulations for flexural stiffness and natural frequencies. MWL specimens with varying membrane thicknesses (0–50 μm) were fabricated via selective laser melting and adhesive bonding, then subjected to three-point bending and vibration tests. Results demonstrate that wrapping with a 50 μm 316 L stainless steel membrane increases the flexural stiffness by 128% and the fundamental natural frequency by 85%. The experimental measurements align well with theoretical and numerical predictions, validating this lightweight, high-stiffness design strategy.