Effect of Technological Defects on Reliability of Engineering Products
- 10.2991/aviaent-19.2019.70How to use a DOI?
- automobile gas cylinder; bulldozer; service fracture; technological defects; fatigue cracks
The nature and reasons of two cases of premature failure of engineering products are investigated (metal-composite cylinder for moto fuel and metal rod of bulldozer's hydraulic cylinder). By methods of metallography and fractography with using the basic provisions of metallurgy, physics of metals, physics of strength and fracture we have identified the localization of initial cracks, the micromechanisms of their formation and subsequent development, and described the general picture of failure. It is shown that the main physical and mechanical causes of cylinder's failure are connected with coarsening and heterogeneity of intermetallic phase distribution in an alloy and the increased roughness of internal surface processing on the metal liner. It is established that the reason of the rod failure was unsatisfactory quality of metal caused by errors of heat treatment before chrome plating. As a result, there are structural inhomogeneities (ferritic banding, non-metallic inclusions) in the hardened layer and in the transitional zone to the core area which initiated the fatigue cracks. The main mechanism of failure of the automobile gas tank and bulldozer's hydraulic-cylinder rod is metal fatigue that evolves in time and is induced by manufacturing processes errors.
- © 2019, the Authors. Published by Atlantis Press.
- Open Access
- This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
Cite this article
TY - CONF AU - S.P. Yakovleva AU - S.N. Makharova AU - A.V. Ptitsyna PY - 2019/11 DA - 2019/11 TI - Effect of Technological Defects on Reliability of Engineering Products BT - Proceedings of the International Conference on Aviamechanical Engineering and Transport (AviaENT 2019) PB - Atlantis Press SP - 380 EP - 384 SN - 2352-5401 UR - https://doi.org/10.2991/aviaent-19.2019.70 DO - 10.2991/aviaent-19.2019.70 ID - Yakovleva2019/11 ER -