Transactions of Materials and Heat Treatment

Title：Research on instabilities of thin-walled spherical head at low thinning rate

Authors： Zhou Lei Li Xinhe Yu Dahui Hu Xingjia

Unit： Central South University

KeyWords： thin-walled spherical head necking spinning wrinkling equivalent model

ClassificationCode：

year,vol(issue):pagenumber：2016,41(1):25-30

Abstract：

The whole forming of large thin-walled spherical heads with high performance, high quality,large diameter-thickness ratio and light weight is an urgent problem to be solved for Chinese aerospace industry. Both experiments and finite element simulations were carried out to analyze the stability of spinning thin-walled spherical head at low thinning rate. The wrinkling in flange region was studied in the experiments, and the process of wrinkling during the necking spinning process was analyzed by software Marc. Further, by establishing the equivalent displacement model of necking spinning, the quantity of necking displacement was found to be directly related to the flange wrinkling, namely, the larger is the quantity of necking displacement,the more obvious is the flange wrinkling. Comparing the maximum principal stress vector calculated by simulation model and by equivalent necking displacement model respectively, it is found that the necking would being the changes of tangential stress which resulted in wrinkling in the flange region. Therefore, the necking is proved to be the main cause of wrinkling.

Funds：

国家重点基础研究发展计划（973）项目（2014CB 046600）

周磊（1990-），男，硕士研究生

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