TY - JOUR

T1 - High-Throughput Micromechanical Testing Enabled by Optimized Direct Laser Writing

AU - Jelinek, Alexander

AU - Žák, Stanislav

AU - Alfreider, Markus

AU - Kiener, Daniel

N1 - Publisher Copyright: © 2022 The Authors. Advanced Engineering Materials published by Wiley-VCH GmbH.

PY - 2023/5/22

Y1 - 2023/5/22

N2 - Direct laser writing by two-photon lithography enables the manufacturing of tailored 3D objects, commonly referred to as 3D-printing, with submicrometer precision. Thereby, new approaches are enabled for miniaturized optical and mechanical devices, where basic material properties act as design guideline and initial input for finite element simulation-driven device design. These mechanical properties are accessible through micromechanical testing and suitably adapted miniaturized specimens. With direct laser writing, a micromechanical specimen geometry can be readily manufactured without additional postprocessing, enabling the possibility of repetitive sample production and further highthroughput testing. Widely overhanging features, as in common bending beamor tension specimens, easily cause floating layers as writing artifacts and thereby undefined geometries. Within this work, an approach to overcome this issue is presented. By introducing a slight taper within the geometry at initially printed layers, a reliable sample geometry is achievable without changing the overall mechanical behavior. As showcase geometries, miniaturized notched cantilever and advanced push-to-pull devices incorporating a notched tension specimen are detailed. Mechanical testing is conducted in situ and ex situ, and the mechanical influence from introducing a taper to a straight geometry is assessed via a finite element modeling. Thereby, a comprehensive approach for high-throughput micromechanical testing is established.

AB - Direct laser writing by two-photon lithography enables the manufacturing of tailored 3D objects, commonly referred to as 3D-printing, with submicrometer precision. Thereby, new approaches are enabled for miniaturized optical and mechanical devices, where basic material properties act as design guideline and initial input for finite element simulation-driven device design. These mechanical properties are accessible through micromechanical testing and suitably adapted miniaturized specimens. With direct laser writing, a micromechanical specimen geometry can be readily manufactured without additional postprocessing, enabling the possibility of repetitive sample production and further highthroughput testing. Widely overhanging features, as in common bending beamor tension specimens, easily cause floating layers as writing artifacts and thereby undefined geometries. Within this work, an approach to overcome this issue is presented. By introducing a slight taper within the geometry at initially printed layers, a reliable sample geometry is achievable without changing the overall mechanical behavior. As showcase geometries, miniaturized notched cantilever and advanced push-to-pull devices incorporating a notched tension specimen are detailed. Mechanical testing is conducted in situ and ex situ, and the mechanical influence from introducing a taper to a straight geometry is assessed via a finite element modeling. Thereby, a comprehensive approach for high-throughput micromechanical testing is established.

KW - finite element modeling

KW - micromechanics

KW - notched cantilever

KW - push-to-pull devices

KW - two-photon lithography

UR - http://www.scopus.com/inward/record.url?scp=85131200538&partnerID=8YFLogxK

U2 - 10.1002/adem.202200288

DO - 10.1002/adem.202200288

M3 - Article

VL - 2023

JO - Advanced engineering materials

JF - Advanced engineering materials

SN - 1527-2648

IS - 25

M1 - 2200288

ER -