Leon Mishnaevsky Mishnaevsky

Bio: Leon Mishnaevsky Mishnaevsky is an academic researcher from Technical University of Denmark. The author has contributed to research in topics: Turbine blade & Wind power. The author has an hindex of 1, co-authored 1 publications receiving 7 citations.

Sustainable End-of-Life Management of Wind Turbine Blades: Overview of Current and Coming Solutions.

Abstract: Various scenarios of end-of-life management of wind turbine blades are reviewed. "Reactive" strategies, designed to deal with already available, ageing turbines, installed in the 2000s, are discussed, among them, maintenance and repair, reuse, refurbishment and recycling. The main results and challenges of "pro-active strategies", designed to ensure recyclability of new generations of wind turbines, are discussed. Among the main directions, the wind turbine blades with thermoplastic and recyclable thermoset composite matrices, as well as wood, bamboo and natural fiber-based composites were reviewed. It is argued that repair and reuse of wind turbine blades, and extension of the blade life has currently a number of advantages over other approaches. While new recyclable materials have been tested in laboratories, or in some cases on small or medium blades, there are remaining technological challenges for their utilization in large wind turbine blades.

Tackling the circular economy challenges-composites recycling: used tyres, wind turbine blades, and solar panels

Abstract: Transformation of waste into resources is an important part of the circular economy. Nowadays, the recovery of materials in the most effective way is crucial for sustainable development. Composite materials offer great opportunities for product development and high performance in use, but their position in a circular economy system remains challenging, especially in terms of material recovery. Currently, the methods applied for recycling composites are not always effective. The aim of the article is to analyse the most important methods of material recovery from multilateral composites. The manuscript presents three case studies related to the recycling of products manufactured from composites: used tyres, wind turbine blades, and solar panels. It shows the advantages and disadvantages of currently applied methods for multilateral composite utilisation and presents further trends in composite recycling. The results show that increasing volumes of end-of-life composites have led to increased attention from government, industry, and academia.

Recent Progress in Carbon Fiber Reinforced Polymers Recycling: A Review of Recycling Methods and Reuse of Carbon Fibers.

Abstract: The rapid increase in the application of carbon fiber reinforced polymer (CFRP) composite materials represents a challenge to waste recycling. The circular economy approach coupled with the possibility of recovering carbon fibers from CFRP waste with similar properties to virgin carbon fibers at a much lower cost and with lower energy consumption motivate the study of CFRP recycling. Mechanical recycling methods allow the obtention of chopped composite materials, while both thermal and chemical recycling methods aim towards recovering carbon fibers. This review examines the three main recycling methods, their processes, and particularities, as well as the reuse of recycled carbon fibers in the manufacture of new composite materials.

Root Causes and Mechanisms of Failure of Wind Turbine Blades: Overview

Abstract: A review of the root causes and mechanisms of damage and failure to wind turbine blades is presented in this paper. In particular, the mechanisms of leading edge erosion, adhesive joint degradation, trailing edge failure, buckling and blade collapse phenomena are considered. Methods of investigation of different damage mechanisms are reviewed, including full scale testing, post-mortem analysis, incident reports, computational simulations and sub-component testing. The most endangered regions of blades include the protruding parts (tip, leading edges), tapered and transitional areas and bond lines/adhesives. Computational models of different blade damage mechanisms are discussed. The role of manufacturing defects (voids, debonding, waviness, other deviations) for the failure mechanisms of wind turbine blades is highlighted. It is concluded that the strength and durability of wind turbine blades is controlled to a large degree by the strength of adhesive joints, interfaces and thin layers (interlaminar layers, adhesives) in the blade. Possible solutions to mitigate various blade damage mechanisms are discussed.

The pyrolysis of end-of-life wind turbine blades under different atmospheres and their effects on the recovered glass fibers

Abstract: Pyrolysis is a promising technology to reclaim glass fibers from end-of-life wind turbine blades (WTBs), while the pyrolysis atmosphere has significant effects on the depolymerization of WTBs and the mechanical properties of recovered fibers. In this study, the pyrolysis performance of commercial end-of-life WTBs under different atmospheres was investigated as well as their effects on the mechanical properties of recovered fibers. The results showed that the pyrolysis gas in N2 atmosphere mainly consisted of CO2, CH4, and CO, and its calorific value was 22.53 MJ/Nm3. Various phenolic compounds were also recovered in the pyrolysis oil. After the post-oxidation of pyrolysis solid products, clean glass fibers could be reclaimed successfully. H2O was an effective gasifying agent in accelerating the decomposition of epoxy resins at 500 °C, which increased the yields of pyrolysis gas and phenolic products while inhibited the formation of char. Besides, the reactivity of residual char was improved, thereby promoting their oxidization in the post-oxidization process but causing the thermal-oxidative diffusion of surface flaws, which slightly degraded the tensile strength of recovered fibers by 5.97%. CO2 suppressed the cracking of epoxy resins and contributed to the simultaneous accumulation of uncracked resins and pyrolysis char, which then aggravated the diffusion of surface flaws by thermal oxidization and uneven heating in the post-oxidation, thereby degrading the tensile strengths of recovered fibers by 16.02%.