Publications by Anastasios Vassilopoulos

A conditional diffusion model-based data augmentation method for structural health monitoring of composites

To address the data scarcity in structural health monitoring (SHM), this study proposes a health index (HI) prediction framework based on a feature-transfer-based conditional denoising diffusion probabilistic model (Conditional DDPM) for data augmentation. ...

2025

On the fatigue behavior of thin and thick adhesively bonded composite joints

Anastasios Vassilopoulos

Investigations of the fatigue performance of adhesively bonded joints were initiated since the 1950 s. An abundance of publications has emerged dealing with the experimental investigation of the fatigue performance of adhesively bonded joints of various ge ...

2025

Standard specimen geometries do not always lead to consistent fatigue results for epoxy adhesives

Anastasios Vassilopoulos, Dharun Vadugappatty Srinivasan

This paper questions the recommendation regarding the use of standard specimen geometries, (Type I, Type II, and Type IV), for estimating the tensile quasi-static and fatigue properties of structural epoxy adhesives. The work presents results from an exper ...

2025

Transfer learning-based approach for evaluating residual stiffness in carbon fiber reinforced composites and adhesives

Anastasios Vassilopoulos

This work proposes a transfer learning-based encoder-decoder framework to predict the relationship between loading conditions and residual stiffness in carbon fiber reinforced composites and adhesives. The encoder, built from a Convolutional Neural Network ...

2025

Toughening of thick bonded interfaces through architected crack-arresting features

Anastasios Vassilopoulos, Dharun Vadugappatty Srinivasan

This research investigates the application of additively manufactured crack-arresting features (CAFs), designed from tough and soft polymers, in enhancing the performance of thick glass fiber-reinforced polymer composite-epoxy adhesive joints found in wind ...

2025

Combined computational-experimental investigation of residual stresses and pre-cracking in mode I behaviour of thick adhesively bonded GFRP composite joints

Véronique Michaud, Anastasios Vassilopoulos, Jialiang Fan

This paper presents a novel Finite Element (FE) simulation approach to examine the mode I fracture of thick adhesive joints used particularly in the trailing edge of the wind turbine blades. The approach involved FE models of the DCB specimens focusing on ...

Elsevier BV2025

A new equivalent crack length technique for mode I fracture of adhesively bonded joints

Véronique Michaud, Anastasios Vassilopoulos, Jialiang Fan

The current investigation introduces the concepts of the equivalent crack length approach for thin and thick adhesive joints. Its applicability is assessed for adhesively bonded composite and steel joints with a bondline thickness ranging from 0.4 mm to 10 ...

2025

An experimental and analytical study of mode I fracture and crack kinking in thick adhesive joints

Véronique Michaud, Anastasios Vassilopoulos, Jialiang Fan

This study investigates the fracture behavior of thick adhesive joints manufactured with composite adherends and bonded with an epoxy-based structural adhesive common to the wind turbine industry. For that purpose, double cantilever beam specimens with an ...

Elsevier BV2024

Experimental and numerical investigation of an additively manufactured sandwich composite bridge deck utilizing gyroid building blocks

Anastasios Vassilopoulos

This work investigates the integration of Additive Manufacturing (AM) techniques with cellular metamaterials integrated into composite sandwich beam systems. The study proposes an approach that combines composite materials for the face sheets with cellular ...

2024

Numerical investigation of two-dimensional Mode-II delamination in composite laminates

Thomas Keller, Anastasios Vassilopoulos, Congzhe Wang

Existing standards for delamination tests on composite materials typically employ one-dimensional (1D) beam specimens. However, such specimens may not represent real delamination scenarios in composite structures, where cracks tend to propagate in two dime ...

Elsevier Sci Ltd2024