Experiment And Simulation On V-bending And Springback Of Laminated Steel Sheet

Vibration and noise have been a public hazard nowadays: vibration, impact andfatigue can impair the life span of mechanical structures; noise has a negative effecton human’s health. In order to reduce vibration and control noise, as well as meet therequirements of environment protection law and noise control act, laminated steelsheet (LSS) came into being. It possesses not only damping characteristic of themiddle polymer layer but also structural property of the two face metal sheets.However, springback is an omnipresent phenomenon during all sheet formingprocesses, resulting in adverse impact on the dimension and precision of products.Particularly, the three-layer structure of LSS makes the springback problem morecomplicated. Therefore, by cooperating with Shanghai Meishan Iron and Steel Co.,Ltd., this dissertation aims to implement a parametric study of various influencefactors on V-bending and springback of LSS, so as to acquire an optimizedcombination of processing and material parameters.Various tests including uniaxial tensile, lap-shear, normal tensile and viscosityanalysis were carried out to obtain the basic mechanical behavior of the polymer layerand the two face metal sheets. Especially, a novel clamp was designed to conduct thenormal tensile test of the polymer layer for the purpose of eliminating the drawbacksof T-peel test when applied to this project.A three-layer finite element model was built in ABAQUS, which is a large-scaleand general purpose nonlinear finite element analysis software. Neo-Hookeanhyperelastic material model was chosen to simulate the polymer layer of LSS basedon continuum mechanics theory. Moreover, theoretical deduction, experimental studyand numerical analysis of lap-shear test were conducted and compared with each other for the purpose of validating the reliability of the above choice.90°V-bending experiments and corresponding simulations of LSS were fulfilledas a validation on the feasibility and efficiency of finite element method and materialmodels. Additionally, a numerical prediction analysis about effects of fillet radius anddisplacement of the punch on the90°V-bending and springback of LSS wasaccomplished and a comparison between the simulation results and experimentalresults was carried out.At last, as for a set of88°V-bending mould which takes springbackcompensation into account in the real production process, a parametric study ofinfluence factors on V-bending and springback of LSS was conducted concerned withit. On the basis of the parametric study, an optimized combination or parameter rangewas acquired. It serves as a critical reference resource for the real V-bendingproduction process of LSS.