Stress ratio (fatigue) Solution

STEP 0: Pre-Calculation Summary
Formula Used
Stress ratio = Minimum compressive stress/Maximum Tensile Stress
R = σmin/σtmax
This formula uses 3 Variables
Variables Used
Stress ratio - Stress ratio is the the ratio of minimum and maximum stress amplitudes of a stress cycle in fatigue.
Minimum compressive stress - (Measured in Pascal) - Minimum compressive stress in a cyclic load during fatigue.
Maximum Tensile Stress - (Measured in Pascal) - Maximum Tensile Stress is the maximum amount of force per unit area acting onto the specimen so that it to prone to getting stretched.
STEP 1: Convert Input(s) to Base Unit
Minimum compressive stress: 40 Megapascal --> 40000000 Pascal (Check conversion here)
Maximum Tensile Stress: 50 Megapascal --> 50000000 Pascal (Check conversion here)
STEP 2: Evaluate Formula
Substituting Input Values in Formula
R = σmintmax --> 40000000/50000000
Evaluating ... ...
R = 0.8
STEP 3: Convert Result to Output's Unit
0.8 --> No Conversion Required
FINAL ANSWER
0.8 <-- Stress ratio
(Calculation completed in 00.004 seconds)

Credits

Created by Hariharan V S
Indian Institute of Technology (IIT), Chennai
Hariharan V S has created this Calculator and 25+ more calculators!
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12 Failure Testing in Materials Calculators

Fracture toughness
Go Fracture Toughness = Dimensionless Parameter in Fracture Toughness*Applied stress*sqrt(pi*Crack Length)
Critical stress for crack propagation
Go Critical stress = sqrt(2*Young's Modulus*Specific surface energy/(pi*Crack Length))
Percent cold work
Go Percent cold work = 100*(Cross-sectional Area-Area after deformation)/Cross-sectional Area
Percent reduction in area
Go Percent reduction in area = (Cross-sectional Area-Fracture area)*100/Cross-sectional Area
Percent elongation
Go Percent elongation = (Fracture Length-Initial Length)*100/Initial Length
Stress concentration factor
Go Stress Concentration Factor = 2*sqrt(Crack Length/Radius of curvature)
Mean stress of stress cycle (fatigue)
Go Mean Stress of Stress Cycle = (Maximum Tensile Stress+Minimum compressive stress)/2
Maximum stress at crack tip
Go Maximum Stress at Crack Tip = Stress Concentration Factor*Applied stress
Range of stress (fatigue)
Go Range of stress = Maximum Tensile Stress-Minimum compressive stress
Stress ratio (fatigue)
Go Stress ratio = Minimum compressive stress/Maximum Tensile Stress
Modulus of resilience
Go Modulus of Resilience = Yield Strength^2/(2*Young's Modulus)
Stress amplitude (fatigue)
Go Stress Amplitude = Range of stress/2

Stress ratio (fatigue) Formula

Stress ratio = Minimum compressive stress/Maximum Tensile Stress
R = σmin/σtmax

Fatigue

Fatigue is a form of failure that occurs in structures subjected to dynamic and fluctuating stresses (e.g., bridges, aircraft, and machine components). Under these circumstances it is possible for failure to occur at a stress level considerably lower than the tensile or yield strength for a static load.

How to Calculate Stress ratio (fatigue)?

Stress ratio (fatigue) calculator uses Stress ratio = Minimum compressive stress/Maximum Tensile Stress to calculate the Stress ratio, Stress ratio (fatigue) is the ratio of minimum and maximum stress amplitudes. Stress ratio is denoted by R symbol.

How to calculate Stress ratio (fatigue) using this online calculator? To use this online calculator for Stress ratio (fatigue), enter Minimum compressive stress min) & Maximum Tensile Stress tmax) and hit the calculate button. Here is how the Stress ratio (fatigue) calculation can be explained with given input values -> 0.8 = 40000000/50000000.

FAQ

What is Stress ratio (fatigue)?
Stress ratio (fatigue) is the ratio of minimum and maximum stress amplitudes and is represented as R = σmintmax or Stress ratio = Minimum compressive stress/Maximum Tensile Stress. Minimum compressive stress in a cyclic load during fatigue & Maximum Tensile Stress is the maximum amount of force per unit area acting onto the specimen so that it to prone to getting stretched.
How to calculate Stress ratio (fatigue)?
Stress ratio (fatigue) is the ratio of minimum and maximum stress amplitudes is calculated using Stress ratio = Minimum compressive stress/Maximum Tensile Stress. To calculate Stress ratio (fatigue), you need Minimum compressive stress min) & Maximum Tensile Stress tmax). With our tool, you need to enter the respective value for Minimum compressive stress & Maximum Tensile Stress 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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