DMMC - Digital Manufacturing and Materials Characterization Lab

We are pleased to announce the publication of our paper with a title "Integrating Image Processing and Machine Learning to Predict Failures in Additive Manufacturing” in the International Journal on Interactive Design and Manufacturing.
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This study investigates a supervised machine learning approach that integrates design parameters, printing conditions, and image-based features to predict potential failures with a specific focus on identifying whether a print will be successful or not.
Congratulations to our PhD candidate Manolis Tzimtzimis and Postdoctoral Researcher Savvas Koltsakidis working under the supervision of Assoc. Prof. Dimitrios Tzetzis, Director of the DMMC Lab. We also gratefully acknowledge the valuable contribution of Assoc Professor Rigas Kotsakis.

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Could machine learning be the key to predicting the mechanical properties of 3D-printed polymers from process parameters?

We’re excited to share our latest publication from the Digital Manufacturing and Materials Characterization Laboratory (DMMC Lab) at the International Hellenic University, now published in Polymers (MDPI):

“Machine Learning for Predicting Mechanical Properties of 3D-Printed Polymers from Process Parameters: A Review”

In this review, we explore how machine learning approaches are reshaping the way researchers and engineers understand and predict the mechanical performance of additively manufactured polymer parts.

Ongoing research at DMMC Lab is focused on combining experimental testing with machine learning to improve the prediction of mechanical properties in additively manufactured polymers.

Machine Learning for Predicting Mechanical Properties of 3D-Printed Polymers from Process Parameters: A Review Polymer additive manufacturing (AM) has grown rapidly in the past decade, with material extrusion, vat photopolymerization, powder bed fusion and jetting now widely used for functional polymer parts. The mechanical performance of these parts depends strongly on process parameters such as layer heigh...

We are pleased to announce the publication of the paper “Design and Evaluation of an Additively Manufactured UAV Fixed-Wing Using Gradient Thickness TPMS Structure and Various Shells and Infill Micro-Porosities.” This work was conducted in collaboration with the UAV-iRC team, of the School of Mechanical Engineering - Aristotle University of Thessaloniki.

The study presents a pressure-driven, variable-thickness TPMS internal wing structure, combined with temperature-controlled foaming filaments to introduce controlled porosity at both macro and micro scales in additively manufactured UAV components.

We look forward to building on this work and exploring further applications of these approaches.

Read the full article here https://www.mdpi.com/2226-4310/13/1/50?utm_source=researchgate.net&utm_medium=article

We’re pleased to share that our paper, “Additive Manufacturing of Gradient Stiffness Honeycombs Using Thermoplastic Polyurethane Composite Material Variations,” has been published in Advanced Engineering Materials.
This work, conducted as part of Savvas Koltsakidis’s PhD research, explores how combining porous, solid, and carbon-fiber-reinforced thermoplastic polyurethane within a single 3D-printed honeycomb structure enables precise control of spatial stiffness while maintaining strong interlayer bonding.
The resulting multi-stiffness designs exhibit enhanced energy absorption and higher densification strains compared to conventional uniform honeycombs, offering a promising approach for applications requiring tunable stiffness and superior impact resistance.
We would like to thank HEAL-Link (Hellenic Academic Libraries Link) for supporting open-access publication and QCONTROL for providing the X-Sight Optical Extensometer with Digital Image Correlation (DIC) capabilities, which were vital for our measurements and analysis.

Read the full article here: https://advanced.onlinelibrary.wiley.com/doi/10.1002/adem.202501422

The DMMC Lab is excited to share a new paper titled "Towards Self-Assembling 3D-Printed Shapes Through Biomimetic Mechanical Interlocking" has just been published in the journal Biomimetics.

This study is conducted by Tino Marte, an undergraduate intern from the Biomimetics-Innovation-Centre (B-I-C), Bremen University of Applied Sciences. During his internship in our lab, Tino quickly identified a compelling research direction and conducted insightful investigations that led to publishable, high-impact results.

This success highlights one of our lab’s missions: encouraging and empowering emerging scientists to harness 3D printing and design across a range of interdisciplinary applications.

We’re welcoming innovative research proposals — reach out to us at [email protected]

Towards Self-Assembling 3D-Printed Shapes Through Βiomimetic Μechanical Interlocking While early studies on macroscopic self-assembly peaked in the late 20th century, recent research continues to explore and expand the field’s potential through innovative materials and external control strategies. To harness this potential, a unit cell was designed and 3D-printed that could form a...

The DMMC Lab is pleased to announce the publication of another paper with a title "The Influence of Ageing Conditions and Liquid Nitrogen Cooling of Extrusion Dies on Nanoindentation Creep in 6060 Aluminium Alloy” in the International Journal of Advanced Manufacturing Technology.
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Τhis study investigates the effect of ageing conditions such as time and temperature as well as the use of liquid nitrogen as a cooling agent on creep behaviour and relevant creep parameters such as steady creep strain rate by nanoindentation tests.

Congratulations to our PhD candidates Vaggelis Giarmas and Manolis Tzimtzimis, under the supervision of Assoc. Prof. Dimitrios Tzetzis, Director of the DMMC Lab.

Read the full paper:

The influence of ageing conditions and liquid nitrogen cooling of extrusion dies on nanoindentation creep in 6060 aluminium alloy - The International Journal of Advanced Manufacturing Technology In the present research, the effect of ageing conditions such as time and temperature as well as the use of liquid nitrogen as a cooling agent on creep behaviour and relevant creep parameters such as steady creep strain rate was investigated by nanoindentation tests. Also, the creep behaviour of the...

The DMMC Lab is pleased to announce the publication of another paper with a title "Mechanical Performance and Microstructural Characterization of Additive Manufactured Selective Laser Melted Bimetallic IN718/17-4PH Stainless Steel” in Materials Science and Engineering.
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Τhis study explores the microstructural and mechanical properties of bimetallic components fabricated using selective laser melting (SLM) from IN718 superalloy and 17-4PH stainless steel. The bimetallic combination aims to merge the high-temperature strength of IN718 with the corrosion resistance and mechanical robustness of 17-4 PH stainless steel.
Congratulations to our PhD candidates Thomas Profitiliotis and Evangelos Giarmas, along with postdoctoral researcher Dr. Nikolaos Kladovasilakis, under the supervision of Assoc. Prof. Dimitrios Tzetzis, Director of the DMMC Lab. Special thanks to Dr. Eleftheria Pechlivani and the Additive Manufacturing Unit (AMU) for their valuable contribution.

Read the full paper:

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The DMMC Lab is pleased to announce the publication of another paper with a title "Development of customized tibial implant with advanced architected
materials utilizing selective laser melting” in Progress in Additive Manufacturing.
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Τhis study focused on the development of a novel customized tibial implant for a total knee replacement, consisting of advanced architected materials to improve the implant’s biocompatibility and address the phenomena of stress shielding and wear.

Development of customized tibial implant with advanced architected materials utilizing selective laser melting - Progress in Additive Manufacturing In recent years, there has been a rising scientific interest in the utilization of advanced additive manufacturing (AM) technologies and sophisticated imaging and design software for developing customized implants with high geometrical complexity, allowing their rapid fabrication and implementation....

The DMMC Lab is pleased to announce the publication of another paper with a title "Nanoindentation Creep Behavior of Additively Manufactured H13 Steel by Utilizing Selective Laser Melting Technology” in Materials.
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Τhis study examines the impact of volumetric energy density (VED), a critical parameter in additive manufacturing (AM), and the effect of post heat-treatment nitrification on the creep behavior of H13 hot work tool steel, which is constructed through selective laser melting (SLM), which is a powder bed fusion process according to ISO/ASTM 52900:2021

Nanoindentation Creep Behavior of Additively Manufactured H13 Steel by Utilizing Selective Laser Melting Technology Nowadays, H13 hot work steel is a commonly used hot work die material in the industry; however, its creep behavior for additively manufactured H13 steel parts has not been widely investigated. This research paper examines the impact of volumetric energy density (VED), a critical parameter in additiv...