Hydroforming

About: Hydroforming is a research topic. Over the lifetime, 2796 publications have been published within this topic receiving 26293 citations. The topic is also known as: Bulge forming.

Experimental and finite element modelling of thin sheet hydroforming processes

Abstract: This paper presents a numerical methodology which aims to improve 3D thin sheet hydroforming processes. This methodology is based on elastoplastic constitutive equations accounting for non-linear anisotropic hardening. The experimental study is dedicated to the identification of material parameters from the global measure of sheet displacement, thickness evolution and internal pressure expansion. Applications are made to study the effect of die shape, anisotropic flow and hardening law on the hydro-formability of sheets.

Investigation into sheet hydroforming based on hydromechanical deep drawing with uniform pressure on the blank

Abstract: Sheet hydroforming has gained increasing interest in the automotive and aerospace industries because of its many advantages such as a higher forming limitation, good quality of the formed parts, the capability of forming complicated parts, etc. Based on the proposed hydromechanical deep drawing (HDD) with uniform pressure on the blank, some characteristics of sheet hydroforming, including the drawing ratio improvement, the quality of the formed parts, the thickness distributions of the formed parts and the process window, are investigated in detail. The effect of the process parameters on the features and ways to improve the sheet formability are discussed both in experiment and simulation. With consideration of the forming limit diagram (FLD), the forming process was studied in simulation. The results from a simulation were in reasonable agreement with those from an experiment.

Latest Hydroforming Technology of Metallic Tubes and Sheets

Abstract: Hydroforming processes of metal tubes and sheets are being widely applied in manufacturing because of the increasing demand for lightweight parts in sectors such as the automobile, aerospace, and ship-building industries [...]

Crashworthiness of Aluminium Tubes; Part 1: Hydroforming at Different Corner‐Fill Radii and End Feeding Levels

Abstract: The automotive industry, with an increasing demand to reduce vehicle weight through the adoption of lightweight materials, requires a search of efficient methods that suit these materials. One attractive concept is to use hydroforming of aluminium tubes. By using FE simulations, the process can be optimized to reduce the risk for failure while maintaining energy absorption and component integrity under crash conditions. It is important to capture the level of residual ductility after forming to allow proper design for crashworthiness. This paper presents numerical and experimental studies that have been carried out for high pressure hydroforming operations to study the influence of the tube corner radius, end feeding, material thinning, and work hardening in 76.2 mm diameter, 3 mm wall thickness AA5754 aluminium alloy tube. End feeding was used to increase the formability of the tubes. The influence of the end feed displacement versus tube forming pressure schedule was studied to optimize the forming process operation to reduce thinning. Validation of the numerical simulations was performed by comparison of the predicted strain distributions and thinning, with measured quantities. The effect of element formulation (thin shell versus solid elements) was also considered in the models.