Effects of loading rates on durability life of a part for random loads

Authors

  • Sagar Polisetti
  • Abhirup Chakraborty

DOI:

https://doi.org/10.37591/joaea.v5i3.1369

Keywords:

Fatigue test, accelerated durability test, strain measurement, fatigue life prediction, loading rates and random loads

Abstract

In the current scenario of fierce competition, manufacturers are under tremendous pressure to launch defect free products at the earliest. Cutting down time at every stage of product development is the need of the hour and testing is no exception. Testing and validation in the automotive domain is of immense importance as any small failure can also lead to catastrophic consequences. Continuous emphasis is in place to accelerate the tests across the industry. Multiple methods have been developed over years to reduce the test time. Traditionally, random load simulation, block load cycles and constant amplitude load cycles have been used. Random loads do simulate the loads under actual conditions, maintain the phase differences and considers the mean load and sequence effects but is highly time consuming. Block cycles do reduce the test time but doesn’t consider the sequence effects though the mean load effects are considered marginally. Constant amplitude cycles give the most test acceleration but don’t consider the effects of mean loads and sequence. In this study, an attempt is made to apply the random loads with increased loading rates to study the effects. A part has been strain gauged and strain vs load for different loading rate has been plotted. Strain life prediction has also been carried out for different loading rates. This has been done to accelerate the test still maintaining the mean load and sequence effects.      

References

P Knoedel and F Steidl et al. Clean Sinusoidal Response vs. Speed in Fatigue Testing. peterknoedel.de.

Weidong Zhang, Mingchao Guo. Rainflow Counting Based

Block Cycle Development for Fatigue Analysis using Nonlinear Stress Approach. SAE Technical Paper 2013-01-1206, doi:

4271/2013-01-1206.

Jang Moo Lee and Kenneth G McConnell. Random Load Simulation in Laboratory Fatigue Testing. SAE Technical Paper 1978-02-01, doi:10.4271/780101.

E Azrulhisham, Y M Asri. Et al. Application of Road

Simulator Service Loads in Automotive Component Durability Assessment. The Open Industrial & Manufacturing Engineering Journal, 2011, 4, 1-7.

C J Dodds. Laboratory Road Simulation for Full Vehicle Testing: A Review. SAE Technical Paper 2001-26-0047, doi:10.4271/2001-26-0047.

R T Booth. Realistic Fatigue Testing and Its Significance in Vehicle Component Design. Proceedings of the Institution of Mechanical Engineers, Sage Journals, 1968-06-01, doi:10.1243/PIME_PROC_1968_183_068_02.

Thomas Svensson, Par Johannesson. et al. Fatigue life prediction based on variable amplitude tests-specific applications. International Journal of Fatigue, 2005.

Vanja, Pahor, Kos Janko, Slavic. et al. Fatigue Damage for

Sweep-Sine and Random Accelerated Vibration Testing. Advances in Mechanical Engineering, Sage Journals, 2014-1117, doi:10.1155/2014/340545.

T Muller and M Sander. Experimental and analytical study of the effect of variable amplitude loadings in VHCF regime. International Conference on Fracture 2016.

Darrell F, Socie. Fatigue-life prediction using local stress strain concepts. Experimental Mechanics Vol. 17, Issue 2, pp 50-56, Chicago – 1977; doi:10.1007/BF02326426.

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Published

2019-02-07

Issue

Vol. 5 No. 3 (2018)

Section

Articles

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