Fatigue Strength Analysis of S34MnV Steel by Accelerated Staircase Test

Abstract

<jats:title>Abstract</jats:title><jats:p>This paper presents the reliability estimation of fatigue strength of the material used for crank throw components. The material used for crank throw components is forged S34MnV steel and subsequently heat-treated by normalising and tempering. High cycle fatigue testing under fully reversed cycling (R = −1) was performed to determine the fatigue limit of the material. The staircase test method is used to obtain accurate values of the mean fatigue limit stress until a number of cycles up to 1E7 cycles. Subsequently, the fatigue test results depend strongly on the stress step and are evaluated by the Dixon-Mood formula. The values of mean fatigue strength and standard deviation predicted by the staircase method are 282 MPa and 10.6MPa, respectively. Finally, the reliability of the design fatigue strength in some selected probability of failure is calculated. Results indicate that the fatigue strength determined from accelerated staircase test is consistent with conventional fatigue testing. Furthermore, the proposed method can be applied for the determination of fatigue strength and standard deviation for design optimisation of S34MnV steel.</jats:p>

Effects of the Vibration Amplitude in Vibratory Stress Relief on the Fatigue Life of Structures

“…This fatigue test method has been widely accepted to examine the fatigue limit of metals. There were also some modified staircase procedures to reduce the number of test specimens and hence lower the cost and running time of this test [26][27].…”

Experimental strain‐based vibration control to obtain the fatigue strain limit by the staircase method

“…Fatigue limit, usually expressed as a stress amplitude, is defined as a fatigue strength below which the component has an infinite fatigue life, [1] and it can be used as a reference value to obtain an estimation of the fatigue state. In practice, the limit value is hard to be determined accurately, and normally it is considered as the fatigue strength which displays at typically 10 6 − 10 7 load cycles [2–5] . Therefore, the fatigue limit is located between high cycle fatigue and unlimited endurance domain, and it needs to be identified by the experimental fatigue test.…”

“…In practice, the limit value is hard to be determined accurately, and normally it is considered as the fatigue strength which displays at typically 10 6 À 10 7 load cycles. [2][3][4][5] Therefore, the fatigue limit is located between high cycle fatigue and unlimited endurance domain, and it needs to be identified by the experimental fatigue test.…”

Improvement of Fatigue Life and Dynamic Strength of an Engine Mounting Bracket Using Experimental and Numerical Approaches

“…However, fatigue testing is costly and time-consuming. Literature studies revealed that the staircase, as an accelerated fatigue testing method, can accurately estimate the fatigue strength in a reasonable time (Ekaputra et al 2020;Wallin 2011). PSA currently uses staircase-Locati procedures for fatigue testing of critical parts like engine mounting brackets (Beaumont et al 2012).…”