Surface Finish Factor of Specimen Calculator

✖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.ⓘ Endurance Limit [S_e]			+10% -10%
✖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.ⓘ Endurance Limit of Rotating Beam Specimen [S'_e]			+10% -10%
✖The Size Factor takes into account the reduction in endurance limit due to an increase in the size of the component.ⓘ Size Factor [K_b]			+10% -10%
✖Reliabilty Factor accounts for the reliability that is used in the design of the component.ⓘ Reliabilty Factor [K_c]			+10% -10%
✖The Modifying Factor for Stress Concentration accounts for the effect of stress concentration on a specimen for cyclic loading.ⓘ Modifying Factor for Stress Concentration [K_d]			+10% -10%

✖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.ⓘ Surface Finish Factor of Specimen [K_a]

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Surface Finish Factor of Specimen Solution

STEP 0: Pre-Calculation Summary

Formula Used

Surface Finish Factor = Endurance Limit/(Endurance Limit of Rotating Beam Specimen*Size Factor*Reliabilty Factor*Modifying Factor for Stress Concentration)
K_a = S_e/(S'_e*K_b*K_c*K_d)
This formula uses 6 Variables

Variables Used

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.
Endurance Limit - (Measured in Pascal) - 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.
Endurance Limit of Rotating Beam Specimen - (Measured in Pascal) - 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.
Size Factor - The Size Factor takes into account the reduction in endurance limit due to an increase in the size of the component.
Reliabilty Factor - Reliabilty Factor accounts for the reliability that is used in the design of the component.
Modifying Factor for Stress Concentration - The Modifying Factor for Stress Concentration accounts for the effect of stress concentration on a specimen for cyclic loading.

STEP 1: Convert Input(s) to Base Unit

Endurance Limit: 51 Newton per Square Millimeter --> 51000000 Pascal (Check conversion here)
Endurance Limit of Rotating Beam Specimen: 220 Newton per Square Millimeter --> 220000000 Pascal (Check conversion here)
Size Factor: 0.85 --> No Conversion Required
Reliabilty Factor: 0.89 --> No Conversion Required
Modifying Factor for Stress Concentration: 0.34 --> No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

K_a = S_e/(S'_e*K_b*K_c*K_d) --> 51000000/(220000000*0.85*0.89*0.34)

Evaluating ... ...

K_a = 0.901279817340624

STEP 3: Convert Result to Output's Unit

0.901279817340624 --> No Conversion Required

FINAL ANSWER

0.901279817340624 ≈ 0.90128 <-- Surface Finish Factor

(Calculation completed in 00.004 seconds)

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National Institute of Technology (NIT), Tiruchirapalli

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< Endurance Limit Approximate Estimation in Design Calculators

Stress Amplitude for Fluctuating load given Maximum Stress and Minimum Stress

Go Stress Amplitude for Fluctuating Load = (Maximum Stress Value for Fluctuating Load-Minimum Stress Value for Fluctuating Load)/2

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

Go Endurance Limit of Rotating Beam Specimen = 0.4*Ultimate Tensile strength

Endurance Limit Stress of Rotating Beam Specimen of Aluminium Alloys

Go Endurance Limit of Rotating Beam Specimen = 0.4*Ultimate Tensile strength

Endurance Limit of Rotating Beam Specimen of Steel

Go Endurance Limit of Rotating Beam Specimen = 0.5*Ultimate Tensile strength

Surface Finish Factor of Specimen Formula

Surface Finish Factor = Endurance Limit/(Endurance Limit of Rotating Beam Specimen*Size Factor*Reliabilty Factor*Modifying Factor for Stress Concentration)
K_a = S_e/(S'_e*K_b*K_c*K_d)

What is endurance limit?

The fatigue or endurance limit of a material is defined as the maximum amplitude of completely reversed stress that the standard specimen can sustain for an unlimited number of cycles without fatigue failure.

How to Calculate Surface Finish Factor of Specimen?

Surface Finish Factor of Specimen calculator uses Surface Finish Factor = Endurance Limit/(Endurance Limit of Rotating Beam Specimen*Size Factor*Reliabilty Factor*Modifying Factor for Stress Concentration) to calculate the Surface Finish Factor, Surface finish factor of specimen formula is defined as the ratio of endurance limit to the product of endurance limit of the rotating-beam specimen, size factor, reliability factor, and modifying factor for stress concentration. It takes into account the reduction in endurance limit due to variation in the surface finish between the specimen and the actual component. Surface Finish Factor is denoted by K_a symbol.

How to calculate Surface Finish Factor of Specimen using this online calculator? To use this online calculator for Surface Finish Factor of Specimen, enter Endurance Limit (S_e), Endurance Limit of Rotating Beam Specimen (S'_e), Size Factor (K_b), Reliabilty Factor (K_c) & Modifying Factor for Stress Concentration (K_d) and hit the calculate button. Here is how the Surface Finish Factor of Specimen calculation can be explained with given input values -> 0.90128 = 51000000/(220000000*0.85*0.89*0.34).

FAQ

What is Surface Finish Factor of Specimen?

Surface finish factor of specimen formula is defined as the ratio of endurance limit to the product of endurance limit of the rotating-beam specimen, size factor, reliability factor, and modifying factor for stress concentration. It takes into account the reduction in endurance limit due to variation in the surface finish between the specimen and the actual component and is represented as K_a = S_e/(S'_e*K_b*K_c*K_d) or Surface Finish Factor = Endurance Limit/(Endurance Limit of Rotating Beam Specimen*Size Factor*Reliabilty Factor*Modifying Factor for Stress Concentration). 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, 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, The Size Factor takes into account the reduction in endurance limit due to an increase in the size of the component, Reliabilty Factor accounts for the reliability that is used in the design of the component & The Modifying Factor for Stress Concentration accounts for the effect of stress concentration on a specimen for cyclic loading.

How to calculate Surface Finish Factor of Specimen?

Surface finish factor of specimen formula is defined as the ratio of endurance limit to the product of endurance limit of the rotating-beam specimen, size factor, reliability factor, and modifying factor for stress concentration. It takes into account the reduction in endurance limit due to variation in the surface finish between the specimen and the actual component is calculated using Surface Finish Factor = Endurance Limit/(Endurance Limit of Rotating Beam Specimen*Size Factor*Reliabilty Factor*Modifying Factor for Stress Concentration). To calculate Surface Finish Factor of Specimen, you need Endurance Limit (S_e), Endurance Limit of Rotating Beam Specimen (S'_e), Size Factor (K_b), Reliabilty Factor (K_c) & Modifying Factor for Stress Concentration (K_d). With our tool, you need to enter the respective value for Endurance Limit, Endurance Limit of Rotating Beam Specimen, Size Factor, Reliabilty Factor & Modifying Factor for Stress Concentration and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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