Characterization and Failure Analysis of an Automotive Ball Joint
| Autor: | Tonya W. Stone, M. N. Burcham, B. M. Watson, A. L. Schemmel, R. Escobar, Caleb O. Yenusah, G. N. Berry, C. U. Verzwyvelt |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
business.industry Scanning electron microscope Mechanical Engineering Curve approximation Linear elasticity 02 engineering and technology Structural engineering 021001 nanoscience & nanotechnology Finite element method Ball joint 020303 mechanical engineering & transports 0203 mechanical engineering Mechanics of Materials Martensite Solid mechanics Ball (bearing) General Materials Science Composite material 0210 nano-technology Safety Risk Reliability and Quality business |
| Zdroj: | Journal of Failure Analysis and Prevention. 17:262-274 |
| ISSN: | 1864-1245 1547-7029 |
| DOI: | 10.1007/s11668-017-0240-4 |
| Popis: | This case study describes the failure analysis of an automotive lower ball joint that fractured under normal driving conditions. Through spectroscopy, the material was determined to be SAE-AISI 5135H steel. The metallographic examination revealed a tempered martensitic structure, and hardness measurements radially across the surface of the cut ball stud suggested that the stud was through hardened. Scanning electron microscopy of the fracture surfaces indicated fatigue as the main failure mechanism. Finite element analysis was used to analyze the performance of the part under a normal loading condition. A detailed fatigue analysis to determine the effect of various loads on the life of the ball joint was completed using three methods: S-N curve approximation using hardness values, S-N approach using Basquin’s equation, and a linear elastic crack-growth model. The cause of failure was determined to be from surface cracks forming in the high stress concentration neck region where the ball and stud are joined. The presence of a small surface flaw in this region was shown to significantly reduce the fatigue life of the ball joint. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink