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Reliability Factor for Fluctuating Load Formula

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Reliabilty Factor accounts for the reliability that is used in the design of the component. Check FAQs

K c = \frac{S e}{S' e \cdot K d \cdot K a \cdot K b}

K_c - Reliabilty Factor?S_e - Endurance Limit?S'_e - Endurance Limit of Rotating Beam Specimen?K_d - Modifying Factor for Stress Concentration?K_a - Surface Finish Factor?K_b - Size Factor?

Reliability Factor for Fluctuating Load Example

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Here is how the Reliability Factor for Fluctuating Load equation looks like with Values.

Here is how the Reliability Factor for Fluctuating Load equation looks like with Units.

Here is how the Reliability Factor for Fluctuating Load equation looks like.

0.8719 = \frac{51}{220 \cdot 0.34 \cdot 0.92 \cdot 0.85}

0.8719 = \frac{51N/mm²}{220N/mm² \cdot 0.34 \cdot 0.92 \cdot 0.85}

0.8719 = \frac{51}{220 \cdot 0.34 \cdot 0.92 \cdot 0.85}

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Reliability Factor for Fluctuating Load Solution

Follow our step by step solution on how to calculate Reliability Factor for Fluctuating Load?

FIRST Step Consider the formula

K c = \frac{S e}{S' e \cdot K d \cdot K a \cdot K b}

Next Step Substitute values of Variables

∴

K c = \frac{51N/mm²}{220N/mm² \cdot 0.34 \cdot 0.92 \cdot 0.85}

Next Step Convert Units

∴

K c = \frac{5.1E+7Pa}{2.2E+8Pa \cdot 0.34 \cdot 0.92 \cdot 0.85}

Next Step Prepare to Evaluate

∴

K c = \frac{5.1E+7}{2.2E+8 \cdot 0.34 \cdot 0.92 \cdot 0.85}

Next Step Evaluate

∴

K c = 0.871890258079516

LAST Step Rounding Answer

∴

K c = 0.8719

Reliability Factor for Fluctuating Load Formula Elements

Variables

Reliabilty Factor

Reliabilty Factor accounts for the reliability that is used in the design of the component.

Symbol: K_c

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Reliabilty Factor

Endurance Limit

The Endurance Limit of a material is defined as the stress below which a material can endure an infinite number of repeated load cycles without exhibiting failure.

Symbol: S_e

Measurement: StressUnit: N/mm²

Note: Value should be greater than 0.

Formulas to find Endurance Limit

Endurance Limit of Rotating Beam Specimen

Endurance Limit of Rotating Beam Specimen is the maximum value of the completely reversed stress for which the specimen can sustain for an infinite number of cycles without any fatigue failure.

Symbol: S'_e

Measurement: StressUnit: N/mm²

Note: Value should be greater than 0.

Formulas to find Endurance Limit of Rotating Beam Specimen

Modifying Factor for Stress Concentration

The Modifying Factor for Stress Concentration accounts for the effect of stress concentration on a specimen for cyclic loading.

Symbol: K_d

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Modifying Factor for Stress Concentration

Surface Finish Factor

The Surface Finish Factor takes into account the reduction in endurance limit due to variation in the surface finish between the specimen and the actual component.

Symbol: K_a

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Surface Finish Factor

Size Factor

The Size Factor takes into account the reduction in endurance limit due to an increase in the size of the component.

Symbol: K_b

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Size Factor

Other formulas in Endurance Limit Approximate Estimation in Design category

Go Stress Amplitude for Fluctuating load given Maximum Stress and Minimum Stress

σ a = \frac{σ max fl - σ min fl}{2}

Go Endurance Limit of Rotating Beam Specimen of Steel

S' e = 0.5 \cdot σ ut

Go Endurance Limit Stress of Rotating Beam Specimen of Cast Iron or Steels

S' e = 0.4 \cdot σ ut

Go Endurance Limit Stress of Rotating Beam Specimen of Aluminium Alloys

S' e = 0.4 \cdot σ ut

How to Evaluate Reliability Factor for Fluctuating Load?

Reliability Factor for Fluctuating Load evaluator uses Reliabilty Factor = Endurance Limit/(Endurance Limit of Rotating Beam Specimen*Modifying Factor for Stress Concentration*Surface Finish Factor*Size Factor) to evaluate the Reliabilty Factor, Reliability Factor for Fluctuating load formula is defined as the ratio of the product of endurance limit to the product of endurance limit of the rotating-beam specimen, modifying factor for stress concentration, surface finish factor, and size factor. It is the reliability that is used in the design of the component. Reliabilty Factor is denoted by K_c symbol.

How to evaluate Reliability Factor for Fluctuating Load using this online evaluator? To use this online evaluator for Reliability Factor for Fluctuating Load, enter Endurance Limit (S_e), Endurance Limit of Rotating Beam Specimen (S'_e), Modifying Factor for Stress Concentration (K_d), Surface Finish Factor (K_a) & Size Factor (K_b) and hit the calculate button.

FAQs on Reliability Factor for Fluctuating Load

What is the formula to find Reliability Factor for Fluctuating Load?

The formula of Reliability Factor for Fluctuating Load is expressed as Reliabilty Factor = Endurance Limit/(Endurance Limit of Rotating Beam Specimen*Modifying Factor for Stress Concentration*Surface Finish Factor*Size Factor). Here is an example- 0.87189 = 51000000/(220000000*0.34*0.92*0.85).

How to calculate Reliability Factor for Fluctuating Load?

With Endurance Limit (S_e), Endurance Limit of Rotating Beam Specimen (S'_e), Modifying Factor for Stress Concentration (K_d), Surface Finish Factor (K_a) & Size Factor (K_b) we can find Reliability Factor for Fluctuating Load using the formula - Reliabilty Factor = Endurance Limit/(Endurance Limit of Rotating Beam Specimen*Modifying Factor for Stress Concentration*Surface Finish Factor*Size Factor).

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Reliability Factor for Fluctuating Load Formula

Reliability Factor for Fluctuating Load Example

Reliability Factor for Fluctuating Load Solution

Reliability Factor for Fluctuating Load Formula Elements

Other formulas in Endurance Limit Approximate Estimation in Design category

How to Evaluate Reliability Factor for Fluctuating Load?

FAQs on Reliability Factor for Fluctuating Load

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