Influence of internal temperature development during manufacturing on thick laminates compression fatigue properties

37th Risø International Symposium on Materials Science

Lahuerta, F.^1 ; Nijssen, R.P.L.^1

Knowledge Centre WMC., Kluisgat 5, Wieringerwerf

1771 MV, Netherlands^1

关键词: Compression fatigue property;    Fatigue properties;    Internal temperature;    Static and dynamic performance;    Thick laminates;    Thickness effect;    Through-thickness;    Wind turbine blades;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/139/1/012028/pdf
DOI  :  10.1088/1757-899X/139/1/012028

来源: IOP

【 摘 要 】

Thick laminates (above 6 mm) are increasingly present in large composite structures such as wind turbine blades. Blade designs are based on static and fatigue coupon tests on 14mm thick laminates. However, a thickness effect has been observed, showing significantly shorter fatigue life in thick laminates. Different factors are suspected to be involved in the decreased static and dynamic performance of thick laminates. These include the effect of selfheating during fatigue testing, scaling effects, and the influence of residual stresses due to temperature gradients during manufacturing. This work studies the influence of the temperature gradients during resin infusion on the through-thickness fatigue properties in thick laminates. Coupons from thick laminates cured at different curing rates have been tested in fatigue. The work reports the compression fatigue properties of a thick laminate and relates the results with the curing rate. Safety factors between 1.23 and 1.60 regarding the influence of the curing cycles in thick laminates are reported.