| Title |
Analysis of the variation of metals mechanical properties depending on operation time |
| Translation of Title |
Metalų mechaninių savybių kitimo priklausomai nuo eksploatacijos trukmės tyrimas. |
| Authors |
Janutėnienė, J ; Didžiokas, R ; Gintalas, M |
| Full Text |
|
| Is Part of |
Mechanika.. Kaunas : Technologija. 2009, Nr. 1 (75), p. 26-30.. ISSN 1392-1207. eISSN 2029-6983 |
| Abstract [eng] |
A long-term operating influence on mechanical properties variation of constructional materials is analysed in this article. During the exploitation of structures and pipelines the consistent surrounding influence causes corrosion of the structures materials. Beside the surrounding influence of the constant stress state affects structures too. For constant stresses mechanical properties of structural elements are variable and the metal is ageing. The article presents experimental researches of hot-water pipelines material. From 20 - 40 years exploited pipelines specimens were cut and tension test was fulfilled. The test results disclosed that material strength stress increased minutely. The value of materials yield stress in exploited specimens showed up later if compared with new material. In the best way the changed materials plasticity properties were exposed by specimens relative elongation, which characterizes materials fragility. Linear materials mechanical properties dependenty on lifetime is presented in the article. According to this linear law it is possible to calculate materials mechanical properties of a structure, which is exploited, and assess safety of this structure. |
| Published |
Kaunas : Technologija |
| Type |
Journal article |
| Language |
English |
| Publication date |
2009 |
| CC license |
|
