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Chirality

Chirality

Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...

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Updated: Oct 2, 2025

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

Compression Behavior of EBM Printed Auxetic Chiral Structures.

Kadir Gunaydin¹, Halit Süleyman Türkmen², Alessandro Airoldi³

¹General Electric Aviation, Gebze, Kocaeli 41400, Turkey.

Materials (Basel, Switzerland)

|February 25, 2022

Summary

This study investigated the mechanical behavior of titanium alloy chiral structures made with electron beam melting (EBM). The research validated numerical models for cyclic compression and crushing, improving energy absorption predictions for additively manufactured parts.

Keywords:

EBM FEM additive manufacturing auxetic chiral energy absorption

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Last Updated: Oct 2, 2025

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Area of Science:

Materials Science and Engineering
Additive Manufacturing
Mechanical Engineering

Background:

Chiral auxetic lattice structures offer unique mechanical properties.
Electron Beam Melting (EBM) is a key additive manufacturing technique for titanium alloys.
Understanding material behavior under cyclic loading and failure is crucial for structural applications.

Purpose of the Study:

To numerically and experimentally investigate the cyclic compression and crush behavior of EBM-produced Ti6Al4V chiral auxetic lattice structures.
To characterize material properties and validate a computational model for predicting mechanical performance.
To identify failure mechanisms and optimize energy absorption capabilities.

Main Methods:

Electron Beam Melting (EBM) for producing Ti6Al4V chiral structures.
Tensile, three-point flexural, cyclic compression, and crush tests for material characterization and behavior analysis.
Development and validation of a non-linear computational model incorporating failure analysis and surface roughness effects.

Main Results:

Numerical and experimental results for cyclic compression and crush behavior of EBM-printed Ti6Al4V chiral cells were validated.
An accurate constitutive equation for as-built parts was derived, considering build orientation and surface roughness.
Failure-prone regions and deformation modes were identified to enhance energy absorption.

Conclusions:

The study successfully validated computational models for predicting the mechanical performance of EBM-printed chiral structures.
Accurate material characterization, including surface roughness, is essential for reliable modeling.
Findings provide insights for optimizing the design of additively manufactured auxetic structures for improved energy absorption.