Development of a lightweight, high-strength composite lattice structure for automotive crash energy absorption using additive manufacturing

Project Abstract

This research investigates the design, fabrication, and evaluation of a lightweight, high-strength composite lattice structure engineered for automotive crash energy absorption via additive manufacturing techniques. The study integrates advanced materials, topology optimization, and process-parameter control to achieve superior energy dissipation while meeting stringent weight and safety criteria. A multi-scale approach is adopted at the macro scale, lattice geometries are optimized to maximize crush energy absorption, peak load safety, and specific energy absorption (SEA); at the micro scale, fiber-matrix interfaces and resin properties are tailored to enhance stiffness, damage tolerance, and impact resistance. Composite lattices comprising continuous fiber-reinforced thermoset and thermoplastic matrices are explored to balance manufacturability, cost, and environmental resistance. Additive manufacturing including fused deposition modeling (FDM) with continuous fiber reinforcement, selective laser sintering (SLS), and resin infusion-based 3D printing is employed to fabricate complex unit cells with controlled porosity and orientation. A topology optimization workflow is developed to generate lattice architectures that exploit anisotropic properties, improve progressive collapse behavior, and localize energy dissipation in designated crash zones. The research emphasizes manufacturability constraints, such as interfacial bonding, bonding line integrity, residual stresses, and process-induced defects, and evaluates how these factors influence nominal and post-crash performance. A comprehensive experimental program characterizes mechanical responses under quasi-static and dynamic loading, including drop-weight impact tests, split Hopkinson pressure bar (SHPB) experiments, and full-scale crash simulations. Finite element models with material nonlinearity, rate-dependent behavior, and progressive crushing mechanisms are validated against experimental data to predict peak forces, crush distance, and SEA with high fidelity. The study also investigates fabrication-induced anisotropy, residual porosity, and buckling modes to understand their effect on energy absorption and crashworthiness. Key outcomes include (i) identification of lattice topologies and material systems that maximize energy absorption while achieving weight reduction targets exceeding 20–40% relative to conventional metallic crash primitives; (ii) demonstration of scalable manufacturing routes for automotive-grade lattice components with reproducible properties and certified performance; (iii) development of design guidelines linking unit cell geometry, fiber orientation, and process parameters to expected crash outcomes; and (iv) establishment of a predictive framework for SEA versus mass, rate effects, and damage tolerance under real-world impact scenarios. The implications extend to front-end and side-impact structures, where lightweight lattice inserts can absorb energy more efficiently, reduce occupant injury risk, and enable novel crash management strategies. Economic viability analyses consider material costs, print-speed, post-processing, and recyclability, while life-cycle assessment highlights potential environmental benefits. Overall, the research contributes to the advancement of crash-optimized composite lattices manufactured additively, offering a pathway to safer, lighter, and more sustainable automotive structures.

Project Overview

What This Project Is About

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A straightforward, hands-on look at using lightweight, strong lattice structures made from composites to improve car crash energy absorption. The project blends simple design ideas with basic manufacturing to see how changes in structure affect safety performance.

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The Problem It Addresses

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Current car parts can be heavy and don’t always absorb impact efficiently. A lattice—think of a web-like structure—made from lightweight materials could spread crash energy better while keeping weight down. The study explores how to design and test such lattices for real-world use.

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Objectives of the Project

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1. Understand the basics of crash energy absorption and material choice for composites.
2. Design a simple lattice geometry optimized for energy absorption.
3. Fabricate a small-scale lattice sample using an affordable additive manufacturing method.
4. Test the sample’s crash-like response and record performance data.
5. Analyze how design and material changes influence energy absorption and weight.

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What You Will Do Step by Step

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1) Learn key concepts (materials, structure, and safety basics). 2) Create simple lattice designs in software. 3) Print samples with a basic 3D printer or composite printer. 4) Set up a basic drop or impact test or use simulated tests. 5) Collect data on forces, deformations, and energy absorbed. 6) Compare designs and draw practical conclusions. 7) Write a clear report explaining methods and results.

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Expected Outcome

Expect a practical understanding of how lattice geometry and material choice affect crash energy absorption, along with a small set of tested designs that show improvements in safety performance while keeping weight low. The project should yield actionable insights for lightweight automotive components.