What does Damage Equivalent Load (DEL) mean?

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Hello all, I am using an open source software called openFAST, and it shows various outputs such as the force along the x axis as the blade rotates around.

I then use a python script that uses the following equation:
del.PNG

where:
neq.PNG


and feq = 2.1Hrz for my example and T is 60 seconds

This is what is called Damage Equivalent Load, but im not sure what that actually means? Equivalent to what? What exactly is DEL? is it based off of cycles or something?
thanks
 

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FAQ: What does Damage Equivalent Load (DEL) mean?

What does Damage Equivalent Load (DEL) mean?

Damage Equivalent Load (DEL) is a concept used in engineering, particularly in the field of fatigue analysis, to quantify the damage caused by varying loads over time. It simplifies complex load histories into a single equivalent load that would cause the same amount of damage as the actual varying loads experienced by the structure or component.

Why is Damage Equivalent Load important?

DEL is important because it allows engineers to predict the lifespan and durability of a structure or component under real-world loading conditions. By converting variable loads into a single equivalent load, it simplifies the analysis and helps in designing more reliable and robust structures.

How is Damage Equivalent Load calculated?

DEL is calculated using a mathematical process that involves rainflow counting to identify load cycles, followed by the application of a damage model like the Miner’s rule. The varying loads are then transformed into an equivalent constant amplitude load that would cause the same cumulative damage over the same period.

In which industries is Damage Equivalent Load commonly used?

DEL is commonly used in industries where fatigue and durability are critical factors, such as aerospace, automotive, wind energy, and civil engineering. It helps in the design and maintenance of aircraft, vehicles, wind turbines, and bridges, among other structures.

What are the limitations of using Damage Equivalent Load?

One limitation of using DEL is that it simplifies complex load histories into a single value, which might not capture all the nuances of the actual loading conditions. Additionally, the accuracy of DEL depends on the chosen damage model and the quality of the load data. It is also less effective for materials or structures that exhibit non-linear fatigue behavior.

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