Advanced Analysis Methods and Nondestructive Inspection Technology Under Development in the NASA Airframe Structural Integrity Program

Harris, Charles E.; Starnes, James H.; Heyman, Joseph S.

doi:10.4271/941247

Cited by 1 publication

(2 citation statements)

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“…For many years, the United States civil [10] and military aerospace communities [11,12] have relied on DADTA as part of the aircraft structural requirements. This dates back to the 1950s [13], and while most of the analysis experience is with metallic structures, great progress has been made with composite structures [14]. For instance, the US Air Force A-10 aircraft is a case study [9,15] that illustrates the effectiveness of DADTA in life prediction updates during different stages of service life.…”

Section: Scope Of the Review Papermentioning

confidence: 99%

“…Durability : Harris et al [14] defines durability as "the ability of the structure to retain adequate properties (strength, stiffness, and environmental resistance) throughout its service life to the extent that any deterioration can be controlled and repaired, if there is a need, by economically acceptable maintenance practices. Structural durability affects the frequency and cost of inspection, replacement, repair, or other maintenance".…”

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confidence: 99%

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Durability and Damage Tolerance Analysis Approaches for Wind Turbine Blade Trailing Edge Life Prediction: A Technical Review

Moroney,

Verma

2023

Energies

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The size of wind turbine blades is increasing rapidly, and they are being installed in remote offshore locations. Consequently, it is essential to focus on improving the design and maintenance procedures in the blade industry to meet the growing demand. Of particular concern is the long-term operational performance of the wind turbine blade trailing edge. In this paper, we discuss the application of durability and damage tolerance analysis (DADTA) approaches to trailing edge service life prediction. DADTA is mandated in the aerospace sector to support airworthiness certification and to provide an updated life prediction of the structure based on the different stages of their service life. The DADTA framework has two main parts: durability and damage tolerance analysis. The durability part uses a structural fatigue approach based on a damage accumulation method during the initial design phase to predict the lifespan of a structure without defects. On the other hand, the damage tolerance analysis part uses a fracture mechanics approach and a damage growth method to update the lifespan prediction of a structure during the operation stages. This is achieved by utilizing sensors and inspection data as inputs while the structure is in service. Both these methods are comprehensive and have merits; however, their broad adoption in the wind turbine blade industry is still lacking. The current paper provides an extensive review of these methods and shows how these can be applied to the wind turbine blade industry, specifically for predicting the structural design life of the trailing edge of composite wind turbine blades. The review includes (a) defining wind turbine trailing edge failure modes, (b) trailing edge design procedures, and (c) a detailed discussion of the application of durability and damage tolerance analysis for trailing edge life prediction. Overall, this review paper would be of special interest to blade designers and would guide researchers and engineers interested in life prediction methodologies based on DADTA approaches for wind turbine blades.

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Section: Scope Of the Review Papermentioning

confidence: 99%

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confidence: 99%