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Stress Analysis of Ellipsoidal Shell with Inner Guide Structure

本站小编 哈尔滨工业大学/2019-10-24

Stress Analysis of Ellipsoidal Shell with Inner Guide Structure

Wei-Wei Zhang, Xiao-Song Wang, Meng Chen, Shi-Jian Yuan

(National Key Laboratory of Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China)



Abstract:

In order to overcome stress concentration and increase fatigue life of ellipsoidal shells with inner guide structure, the stress analysis for strength check is very important. Owing to the main sectional profile with ellipsoidal shape, the stress distribution for perfect ellipsoidal shell is firstly conducted based on the theoretical calculation and strain gauges measurement. The experiment results show that the stresses increase gradually from pole region to equatorial plane, but still within elastic range. Secondly, strain gauge measurement for ellipsoidal shells with inner guide structure is conducted. The results show that stresses are concentrated at the vicinity of bottom plate and beyond elastic range, so the structural redesign is needed. Finally based on the analysis mentioned above, a redesigned structure with local thickening is proposed. Experimental research shows that the stress varies more even after structural redesign and within allowable range. Numerical simulation shows that both the deformation and fatigue life after redesign are acceptable.

Key words:  ellipsoidal shell  strain gauge measurement  redesign  fatigue life

DOI:10.11916/j.issn.1005-9113.2014.05.016

Clc Number:TG394

Fund:


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