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http://dx.doi.org/10.5228/KSPP.2007.16.2.138

Analysis of 3-D Superplastic Forming/Diffusion Bonding Process Using a Hierarchical Contact Searching Method(I)  

Kang, Y.K. (국방과학연구소)
Song, J.S. (충남대학교 대학원, BK21 메카트로닉스사업단)
Hong, S.S. (국방과학연구소)
Kwon, Y.N. (한국기계연구원)
Lee, J.H. (한국기계연구원)
Kim, Y.H. (충남대학교, BK21 메카트로닉스사업단)
Publication Information
Transactions of Materials Processing / v.16, no.2, 2007 , pp. 138-143 More about this Journal
Abstract
Superplastic forming/diffusion bonding (SPF/DB) processes were analyzed using a 3-D rigid visco-plastic finite element method. A constant-triangular element based on membrane approximation and an incremental theory of plasticity are employed for the formulation. The coulomb friction law is used for interface friction between tool and material. Pressure-time relationship for a given optimal strain rate is calculated by stress and pressure values at the previous iteration step. In order to improve the contact searching, hierarchical search algorithm has been applied and implemented into the code. Various geometries including sandwich panel and 3 sheet shape for 3-D SPF/DB model are analyzed using the developed program. The validity fer the analysis is verified by comparison between analysis and results in the literature.
Keywords
Superplastic Forming; Diffusion Bonding; Forming Pressure; Hierarchical Contact Search Algorithm;
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