Tagged: 19.1, fatigue, materials, mechanical, structuralmechanics


March 17, 2023 at 9:00 amFAQParticipant
The correct method to define the SN data in Engineering Data for spectral fatigue is a bit counterintuitive for two reasons: 1.The SN curve can only be defined as a linear or bilinear curve (in loglog space). To directly define the SN curve, you must define the Fatigue Strength Coefficient(s) and the Fatigue Strength Exponent(s). If you enter the SN data using in the table, the Fatigue Tool fits a straight line between the first data point (fewest cycles) and the last data point (most cycles). 2.The Fatigue Strength Exponent (m) that Engineering Data uses to define the linear or bilinear SN curve for spectral fatigue is the negative inverse of what is traditionally called the â€œfatigue strength exponentâ€ in Basquinâ€™s equation (elastic portion of the EN curve). In traditional usage, the fatigue exponent is a negative value. For spectral fatigue using the Mechanical Fatigue Tool, it will be a positive value.

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