RESEARCH PAPER
The influence of an innovative trigger obtained by zonal appropriate annealing of the walls in a columnar passive energy absorber on the achieved crashworthiness indicators - experimental study
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Machine Design and Mechatronics, Lublin University of Technology, Poland
Submission date: 2024-06-20
Final revision date: 2024-07-09
Acceptance date: 2024-07-26
Online publication date: 2024-08-03
Publication date: 2024-08-03
Corresponding author
Mirosław Ferdynus
Machine Design and Mechatronics, Lublin University of Technology, Nadbystrzycka, 20-618, Lublin, Poland
Eksploatacja i Niezawodność – Maintenance and Reliability 2024;26(4):191692
HIGHLIGHTS
- Innovative trigger in energy absorber, extremely simple to make and does not require specialized instrumentation has been demonstrated.
- The method of making a zone-annealed trigger and a classic author's trigger with spheroidal embossing has been shown.
- The methodology of experimental tests leading to the crushing force-shortening characteristics and the calculation of the crashworthiness indicators was presented.
- Based on the results of experimental studies, it has been proven that the new solutions achieve extremely favorable crashworthiness indicators compared to the energyabsorber with a classic trigger.
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ABSTRACT
The crashworthiness indicators are a key parameter for assessing the effectiveness of energy absorbers and these in turn are highly dependent on the initial phase of the crumple process and triggering mechanism. In classical designs, indentations or holes are made at a specific location to improve the triggering performance, however, the effects are limited and often unsatisfactory. This paper proposes an innovative, original solution for a column energy absorber that significantly improves the triggering parameters and relies on the introduction of smooth changes in material properties along the column axis through the use of specially localized annealing and cooling with specific parameters in its manufacturing process. The veracity of the idea presented was warranted by an experiment from which the characteristics of crushing force vs. shortening were obtained, which in turn were used to calculate crashworthiness indicators. Results confirm extremely good energy-absorbing properties of the proposed solution compared to the classic ones.