Topic
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.
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TL;DR: In this paper, a finite element (FE)-based simulation was used to determine optimum loading paths for tube hydroforming of structural parts with different tubular materials, and the test results showed that the reliability of the FE-based loading paths is highly dependent on the accuracy of the material properties of the blank, interface friction, and how close the properties of welding zone are to the base material of the tubular blank.
131 citations
TL;DR: In this article, a tool set, a simple stand alone hydraulic bulging fixture, was developed to expand the tubes under bi-axial loading conditions, along with analytical methods and finite element simulation, for tubular workpieces.
130 citations
TL;DR: In this article, the cutting plane algorithm for the integration of a general class of elasto-plastic constitutive models was used to implement this yield function into the commercial FEM code LS-Dyna as a user material subroutine (UMAT).
128 citations
29 Feb 2000-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, a stroke-controlled free forming is studied theoretically and experimentally, where the theoretical part consists of analytical modeling and finite-element simulations, and the conducted experiments are used to show the types of errors that might occur, when the theoretically obtained loading paths are transferred to the hydroforming equipment.
Abstract: To select tube hydroforming instead of conventional fabrication, one has to know the tube material behaviour and tribological effects during hydroforming and how the hydroforming operation itself should be controlled. The hydroforming operation is either force- or stroke-controlled. This paper deals with stroke-controlled hydroforming. Hydroforming consists of free forming and calibration. In this paper, only the so-called free forming is treated. Stroke-controlled free forming is studied theoretically and experimentally. The theoretical part consists of analytical modeling and finite-element simulations. The conducted experiments are used to show the types of errors that might occur, when the theoretically obtained loading paths are transferred to the hydroforming equipment. The forming limit curve (FLC) is normally used as an aid/instrument in component and process design (which include finite-element simulations). The present study shows that the FLC of the tube material must be determined by hydroforming, if component and process design are to rely on this instrument.
126 citations
TL;DR: An overview of the state of the art and important advances of hydroforming regarding the design of process steps, semifinished products, presses and tools is presented in this article, along with new hydroforming technologies like the use of heat energy to improve formability of lightweight materials.
126 citations