A New Brazilian Friction-Resistant Low Alloy High Strength Steel – A Life Testing Approach

Authors: D. I. De Souza, G. P. Azevedo, R. Rocha

Abstract:

In this paper we will develop a sequential life test approach applied to a modified low alloy-high strength steel part used in highway overpasses in Brazil.We will consider two possible underlying sampling distributions: the Normal and theInverse Weibull models. The minimum life will be considered equal to zero. We will use the two underlying models to analyze a fatigue life test situation, comparing the results obtained from both.Since a major chemical component of this low alloy-high strength steel part has been changed, there is little information available about the possible values that the parameters of the corresponding Normal and Inverse Weibull underlying sampling distributions could have. To estimate the shape and the scale parameters of these two sampling models we will use a maximum likelihood approach for censored failure data. We will also develop a truncation mechanism for the Inverse Weibull and Normal models. We will provide rules to truncate a sequential life testing situation making one of the two possible decisions at the moment of truncation; that is, accept or reject the null hypothesis H0. An example will develop the proposed truncated sequential life testing approach for the Inverse Weibull and Normal models.

Keywords: Sequential life testing, normal and inverse Weibull models, maximum likelihood approach, truncation mechanism.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1084872

References:

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[2] D. I. De Souza, "Sequential life testing with an underlying Weibull sampling distribution.," Proceedings of the ESREL -99 International Conference on Safety and Reliability,.vol. 2, pp. 869-874,Garching, Germany, June 1999.
[3] Daniel I. De Souza, "Sequential Life-Testing with Truncation Mechanisms for Underlying Three-Parameter Weibull and Inverse Weibull Models," COMADEM 2004Conference,Cambridge, U.K.,pp. 260-271, August 2004.
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[5] Daniel I. De Souza,"Sequential Life Testing with a Truncation Mechanism for an Underlying Weibull Model,"Towards a Safer World, ESREL 2001 Conference, Torino, Italy, vol. 3, pp. 1539 -1546, 16-20 September, 2001.