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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Engineering news on Phys.org

1. What is Damage Equivalent Load (DEL)?

Damage Equivalent Load (DEL) is a metric used to quantify the fatigue damage experienced by a structure or component over time due to repeated loading cycles. It takes into account the magnitude, frequency, and duration of the loading, as well as the material properties of the structure.

2. How is DEL calculated?

DEL is typically calculated using the Palmgren-Miner rule, which states that the damage caused by each loading cycle is proportional to the ratio of the applied stress to the fatigue strength of the material. The DEL is then determined by summing up the damage caused by each loading cycle over the lifetime of the structure.

3. Why is DEL important in engineering?

DEL is important in engineering because it allows engineers to predict the lifespan of a structure or component under repeated loading, and to design for a desired level of reliability. It also helps in identifying potential failure points and making design improvements to increase the durability of a structure.

4. How does DEL differ from other fatigue metrics?

DEL differs from other fatigue metrics, such as fatigue life or fatigue strength, in that it takes into account both the magnitude and frequency of loading. This makes it a more comprehensive and accurate measure of fatigue damage over time.

5. Can DEL be used for all types of materials?

DEL can be used for most types of materials, including metals, composites, and plastics. However, it may need to be modified for certain materials, such as those with nonlinear stress-strain relationships or those that exhibit creep under sustained loading.

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