本团队马丽博士后等在International Journal of Mechanical Sciences发表研究论文。

摘要：The interfacial load between the die and sheet governs the sheet-metal deformation. However, the majority of existing instability models assume a decoupled interfacial load, failing to capture the dynamic interaction between rate-sensitive flexible force-transmitting media (RSFTM) and evolving sheet defects. This study proposes a bi-directional coupled theoretical framework that integrates adaptive tangential load distribution with evolving sheet thickness configuration to reveal this dynamic interaction mechanism. The model captures the deformation-control behavior of RSFTM in the localized thinning zone and extends its adaptive control to complex-component forming. The results show that predictions from the proposed model agree well with finite element analysis (FEA) and experimental data. The model effectively captures how the RSFTM senses transient plastic flow in the sheet and spontaneously forms a dynamic tangential load field on the necking surface, characterized by a “minimum at the center and large at the periphery.” This field provides real-time stress compensation to the localized thinning region and drives plastic deformation to diffuse outward from the necking region—an adaptive regulatory behavior. The greater the sheet thickness defect, the stronger the feedback shear regulation of the medium. In multiaxial plastic deformation during complex component forming, RSFTM exhibits fixed-point shear compensation at local thinning sites, automatic migration of the regulation locus with strain evolution, and synchronous stabilization control of plastic flow at numerous sites. By examining the interfacial interaction between the force-transmitting medium and sheet, this study provides theoretical support for achieving adaptive, precise control of local deformation in complex thin-walled components.