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May 20-21, 2019 | Vienna, Austria

Biomaterials and Nanomaterials &

Materials Physics and Materials Science

International Conference on

Journal of Materials Science and Nanotechnology | Volume 3

Residual strength properties of GFRP composites, using in SARI 250kWwind turbine

blade: A practical approach to predict fatigue damages

Pouya Valizadeh

Ferdowsi University of Mashhad, Iran

ne of the applications of glass fiber reinforced

polymers are in wind turbine blades. These blades

are subjected to cyclical loading consequently suffering

fatigue damage. In this study, the residual strength

in E-glass fiber reinforced epoxy composite with the

sequence of [90/0/±45]’ made by vacuum infusion process

(VIP) has been investigated. By determining the ultimate

tensile strength and S-N curve, the residual strength test

was performed at a maximum stress level of 163 MPa for

three different ratios of nominal fatigue lifetime namely,

20, 50 and 80 percent of nominal fatigue lifetime. The

experimental results of residual strength were analysed by

linear (BR), nonlinear (REI) and modified (OM) proposed

models. The reduction in the residual strength was

observed in the experimental and predicted results of

the OM model representing a preliminary loss of residual

strength, a subsequent decrease with low slope and a

sudden drop at later stages of its life. These changes may

be attributed to the rapid accumulation of the damage

in the first stage, damping at energy in the second stage

and delamination in the third stage. The results represent

the conservative function of the linear model (BR) and

the adaptation of the modified model (OM) to the

experimental results.

Speaker Biography

Pouya Valizadeh is a dynamic industrial PhD candidate with more than

7 years of experience in design, manufacturing and testing of wind

turbine blade; familiar with related cost analysis and raw materials

market. Some of his academic research works are a fatigue and failure

mechanisms of GFRP composites and adhesives in wind turbine blades,

and industrial projects such as design and implementation of T-Bolts in

root joint of wind turbine blades.