Effect of static tensile stresses on the damping properties of turbine blade materials during bending oscillations

1969 ◽  
Vol 1 (6) ◽  
pp. 634-637 ◽  
Author(s):  
V. V. Matveev ◽  
G. S. Krivonogov ◽  
B. S. Chaikovskii ◽  
I. M. Kachanova
Keyword(s):  
Turbine Blade ◽  
Damping Properties ◽  
Tensile Stresses ◽  
Static Tensile

Effect of static tensile stresses on the damping capacity of porous titanium

1990 ◽  
Vol 22 (7) ◽  
pp. 1064-1067
Author(s):  
V. V. Khil'chevskii ◽  
L. I. Tuchinskii ◽  
V. G. Sharapov ◽  
V. G. Enevich ◽  
A. B. Sapozhnikova ◽  
...  
Keyword(s):  
Porous Titanium ◽  
Damping Capacity ◽  
Tensile Stresses ◽  
Static Tensile

Effect of static tensile stresses on the dissipative properties of copper-aluminum-zinc alloys

1982 ◽  
Vol 14 (9) ◽  
pp. 1271-1275
Author(s):  
V. V. Matveev ◽  
B. S. Chaikovskii ◽  
D. E. Shpak ◽  
G. Ya. Yaroslavskii ◽  
S. Yu. Kondrat'ev
Keyword(s):  
Zinc Alloys ◽  
Tensile Stresses ◽  
Static Tensile ◽  
Copper Aluminum

scholarly journals Experimental Study of Stepped-Lap Scarf Joint Repair for Spar Cap Damage of Wind Turbine Blade in Service

2020 ◽  
Vol 10 (3) ◽  
pp. 922
Author(s):  
Hui Li ◽  
Cheng Chen ◽  
Tongguang Wang ◽  
Long Wang
Keyword(s):  
Crack Propagation ◽  
Tensile Test ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
Joint Surface ◽  
Lap Joint ◽  
Scarf Joint ◽  
Static Tensile ◽  
Joint Repair

The objective of this paper was to design configuration parameters for a stepped-lap scarf joint repair, which can be used for spar cap damage of a wind turbine blade in service and to realize the post-repair monitoring. Two experimental studies were included. First, tensile test for the unidirectional tape specimens with a large aspect ratio repaired using a multiple stepped-lap scarf joint method was carried out. The results showed that the reinforcement layer could effectively improve the load-carrying capacity of the repaired zone. The stepped-lap joint surface was identified as the weak part of the spar cap repair, which should be monitored. Second, by embedding carbon nanotube buckypaper sensors on the stepped-lap joint surface of the repaired specimens, quasi-static tensile tests and fatigue tests were carried out. According to the resistance response of the sensors, the quasi-static tensile test confirmed the failure processes, namely the stiffness turning point, damage evolution, crack propagation, and fracture. The fatigue test could accurately identify the progressive failure, namely the initial damage, damage accumulation, initial cracking, and crack propagation to structural failure. The above tests provided an important configuration parameter basis for evaluating the spar cap repair scheme and presented a promising method for the health monitoring of a spar cap after repair.

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