Publications de Dharun Vadugappatty Srinivasan

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

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

A generalized machine learning framework to estimate fatigue life across materials with minimal data

Anastasios Vassilopoulos, Dharun Vadugappatty Srinivasan

In this research, a generalized machine learning (ML) framework is proposed to estimate the fatigue life of epoxy polymers and additively manufactured AlSi10Mg alloy materials, leveraging their failure surface void characteristics. An extreme gradient boos ...

2024

Influence of Thermoplastic Interlayers on Fatigue Crack Growth in Epoxy Materials

Anastasios Vassilopoulos, Dharun Vadugappatty Srinivasan

This work examines the fatigue crack-arresting capability of thin PEI and PVDF thermoplastic interlayers in short-glass fiber-modified epoxy and core-shell rubber-modified epoxy materials. Singleedge notch bending epoxy specimens with and without interlaye ...

2024

Damage-tolerant behavior of structural epoxies with thin PEI and PVDF interlayers

Anastasios Vassilopoulos, Dharun Vadugappatty Srinivasan

This work examines the crack-arresting capability of PEI and PVDF thermoplastic interlayers in short-glass fiber modified and core-shell rubber toughened epoxy materials under mode-I fracture loading. Experimental results show that the initial crack can be ...

London2024

Mode-I Fracture Analysis of thick Advanced Joints Toughened With Thermoplastic Layers

Anastasios Vassilopoulos, Dharun Vadugappatty Srinivasan

This work aims to investigate the quasi-static mode-I fracture behavior of thick glass fiber-reinforced polymeric composite-epoxy adhesive joints having a nominal bond line thickness of 10 mm, focused on wind turbine rotor blade applications. The thick adh ...

2024

Crack Arresting Strategies for Wind Turbine Blade Adhesive Joints

Dharun Vadugappatty Srinivasan

The wind energy sector has achieved significant milestones driven by rapid industrialization and the adoption of larger wind turbine rotor blades. These blades, manufactured with thick composite shells and spars, rely on adhesive bonding technology for ass ...

EPFL2024

Fatigue performance of wind turbine rotor blade epoxy adhesives

Anastasios Vassilopoulos, Dharun Vadugappatty Srinivasan

2023

CRACK SHIELDING MECHANISMS OF INTERLAYERED EPOXY MATERIALS UNDER QUASI-STATIC AND FATIGUE LOADING

Anastasios Vassilopoulos, Dharun Vadugappatty Srinivasan

This research explores the capability of PEI and PVDF thermoplastic interlayers to arrest cracks in epoxy materials modified with short-glass fibers and core-shell rubber particles. It also investigates the effect of interlayer position, the number of inte ...

Queen's University Belfast2023

Dataset for the hybrid non-toughened and toughened epoxy adhesive properties

Anastasios Vassilopoulos, Dharun Vadugappatty Srinivasan

In this article, the manufacturing and toughening effects on the material properties of epoxy adhesives used in wind tur-bine rotor blades are presented. Different adhesive materi-als are developed by combining SPABONDTM 820HTA (non-toughened) and SPABONDT ...

ELSEVIER2023