Visual Inspection on Failure Surface of Constant Force Spring (CFS) Fitted in a Counterweight Balancing Mechanism
| Autor: | Abdullah Shohaimi, Ahmad Zaidi Ahmad Mujahid, Wan Mat Wan Ali, Jamil Hariz, Thanakodi Suresh, Husain Firdaus, Shah Koslan Fuad, Othman Mohd Zaid, H. Kamarudin Khairul |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
business.industry Mechanical Engineering Constant-force spring Structural engineering Condensed Matter Physics Counterweight Crack closure Mechanics of Materials Spring (device) Perpendicular Fracture (geology) General Materials Science Grain boundary Composite material business Stress concentration |
| Zdroj: | Materials Science Forum. 819:461-466 |
| ISSN: | 1662-9752 |
| DOI: | 10.4028/www.scientific.net/msf.819.461 |
| Popis: | A failure characteristic of a fractured constant force spring (CFS) or flat spiral spring fitted in a counterweight balancing mechanism is investigated via series of visual experimentation. Macroscopic examination reveals several beach marks that shows direction of fatigue crack propagation has indicated that the CFS fracture had initiated and propagated due to fatigue from an inner surface origin. Macro cracks resulted from stress concentration were also visible on grain boundaries. The crack was initiated at the center of the CFS which later propagated in the direction perpendicular to the applied cyclic load and finally fractured when it can no longer sustain the applied cyclic load. Inspection via Scanning Electron Microscopy (SEM) has indicatedsign of fatigue striations perpendicular to the fracture propagation which is a characteristic of fatigue failure mechanism. Examination of the fractured surface also pointed porosities that reflects points of crack initiation. Multiple crack initiation points identified shows that the fracture was a result of high stress or high stress concentration. |
| Databáze: | OpenAIRE |
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