Fatigue Failure Analysis of Notched Specimen with En19, En354 and En36c Materials


Authors : GVR Seshagiri Rao; P Y Yogesh Kumar; Kotha Pavan Kumar; A Raghupathi Shiva Kumar Raju

Volume/Issue : Volume 9 - 2024, Issue 12 - December

Google Scholar : https://tinyurl.com/2sz327p6

Scribd : https://tinyurl.com/ydfyj7yt

DOI : https://doi.org/10.5281/zenodo.14565235

Abstract : In order to prevent failures, a mechanical machine must take into account the impact of cyclic stress. The rotating-beam fatigue tester used in this work determines the fatigue life of EN19, EN354, and EN36C alloy materials. Although probabilistic fatigue evaluation is essential for guaranteeing the service integrity of big mechanical equipment, the combination of multiaxial stress circumstances, limited sample information characteristics, and probabilistic fatigue models remains inadequate in actual engineering. Therefore, a generic probabilistic fatigue evaluation procedure is proposed by efficiently combining the virtual subsample augmentation approach with the enhanced Bootstrap method. Specifically, the random sample regeneration method is first used to expand the small sample fatigue data, and then life distribution information under different stress levels is fused based on the backwards statistical inference method, the S- N curve is fitted with the integrated life dispersion information. Secondly, a new fatigue damage parameter based on the inhibition function is proposed to modify the S-N curve and predict fatigue life. Meantime, the fatigue test of alloy steel with different notch sizes is to be carried out, for different materials EN19, EN354, EN36C alloy. The results show that the impact of notch and size effects on fatigue damage of proposed specimens.

Keywords : Fatigue, Failure Cycle, Notched Specimen, Strain Life Equation.

References :

  1. GVR Seshagiri Rao, VVSH Prasad, M Sunil kumar and VKVS Krishnam Raju , Experimental validation of fatigue life for thread rolling form tool material GVR Seshagiri Rao et al 2020 IOP Conf. Ser.: Mater. Sci. Eng. 998 012040
  2. L. F. Cao,Qipeng Li,Zhongwang Niu,Yuan-yuan Zheng, An Investigation on Fatigue Resistance of Notched Long Fiber-Reinforced Composite Materials - Polymers - Vol. 14, 01 Feb 2022.
  3. Prashant S. Humnabad,M. B. Hanamantraygouda,S B Halesh Fatigue Studies On Aluminum 6061/SiC Reinforcement Metal Matrix Composites - Journal of Mines, Metals and Fuels - Vol. 70, Iss: 3A, pp 143-143 12 Jul 2022 
  4. Yao Qiao,Antonio Alessandro Deleo,Marco Salviato A study on the multi-axial fatigue failure behavior of notched composite laminates Composites Part A-applied Science and Ma… (Elsevier) - Vol. 127, pp 105640, 01 Dec 2019 
  5. S. Ramanathan, B. Vinod, M. Anandajothi Investigation of Fatigue Strength and Life  rediction for Automotive Safety Components of V-Notched and Un-notched Specimen Part I: Utilization of Waste Materials into Raw Materials (Springer India) - Vol. 72, Iss: 10, pp 2631-2647 01 Oct 2019.

In order to prevent failures, a mechanical machine must take into account the impact of cyclic stress. The rotating-beam fatigue tester used in this work determines the fatigue life of EN19, EN354, and EN36C alloy materials. Although probabilistic fatigue evaluation is essential for guaranteeing the service integrity of big mechanical equipment, the combination of multiaxial stress circumstances, limited sample information characteristics, and probabilistic fatigue models remains inadequate in actual engineering. Therefore, a generic probabilistic fatigue evaluation procedure is proposed by efficiently combining the virtual subsample augmentation approach with the enhanced Bootstrap method. Specifically, the random sample regeneration method is first used to expand the small sample fatigue data, and then life distribution information under different stress levels is fused based on the backwards statistical inference method, the S- N curve is fitted with the integrated life dispersion information. Secondly, a new fatigue damage parameter based on the inhibition function is proposed to modify the S-N curve and predict fatigue life. Meantime, the fatigue test of alloy steel with different notch sizes is to be carried out, for different materials EN19, EN354, EN36C alloy. The results show that the impact of notch and size effects on fatigue damage of proposed specimens.

Keywords : Fatigue, Failure Cycle, Notched Specimen, Strain Life Equation.

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