Sub-zero Quasi-static and Fatigue Behavior of SAE 1040 Automotive Anti-roll Bars in Flexure

Authors Abstract
The objective of the study was to evaluate the quasi-static and fatigue performance of automotive anti-roll bars (ARBs) under extreme environmental conditions. Flexural quasi-static and fatigue tests of SAE 1040 steel were conducted above and below the ductile-to-brittle transition temperature (DBTT) in flexure and compared with their room temperature performance. The flexural strength increased by decreasing the temperature to −40°C. The fatigue lives are determined for stress levels of 87%, 60%, and 30% of their flexural strength under displacement mode in constant amplitude loading. Experimental stress versus the number of cycles (S-N) curves of SAE 1040 steel state that all tube specimens have fatigue limits that were more than 100,000 cycles at −40°C. The fatigue life of the SAE 1040 tube exhibited infinite life below the ductile-to-brittle transition (DBT). The finite element (FE) model of ARB was used to determine the quasi-static strength, as well as in the calculation of fatigue analysis. The FE fatigue life predictions of all stress levels match the experimental results. Fractography of failed specimens revealed cleavage fractures resembling river patterns at −40°C, followed by the fine steps feather marking, tear ridges, decohesion, transgranular fractures, etc. in subsequent DBTTs, i.e., −30°C to +10°C of quasi-static testing. The flexural fatigue fracture surface analysis showed that the mechanisms at −40°C were quite distinct, involving transgranular cracks with dislocation strengthening.
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Bhanage, A., and Krishnan, P., "Sub-zero Quasi-static and Fatigue Behavior of SAE 1040 Automotive Anti-roll Bars in Flexure," SAE Int. J. Passeng. Veh. Syst. 16(2):147-165, 2023,
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Jan 5, 2023
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Journal Article