Gow-Yi Tzou

article

Study on rotating compression forming of double-layer clad ring considering Coulomb friction

Gow-Yi Tzou, Yeong-Maw Hwang, Hsiang-Yu Teng

International Journal of Precision Engineering and Manufacturing-Green... > 2014 > 1 > 3 > 191-199

This study uses two FEM simulations based on deform 3D and superform commercial software assuming coulomb friction to explore the plastic behavior in rotating compression forming of double-layer bounded clad ring. The rotating compression forming can reduce the compressive force and make the deformation uniform. Effects of the frictional coefficient, shear yield stress ratio, rotating angular velocity,...

article

Effect of plastic anisotropy on the limit load of highly undermatched welded specimens in bending

Sergei Alexandrov, Gow-Yi Tzou, Shao-Yi Hsia

Engineering Fracture Mechanics > 2008 > 75 > 10 > 3131-3140

Plastic anisotropy is a typical property of many metals and it can have a significant effect of the limit load of structures. It is therefore of importance to evaluate this effect for typical geometries covered by compendia of flaw assessment procedures for limit load solutions. The present paper deals with a typical highly undermatched specimen in pure bending. It is assumed that the mismatch factor...

article

Investigation of a slab method analysis and FEM simulation on rotating compression forming of ring

Gow-Yi Tzou, Hung-Hsiou Hsu, Yun-Hsiu Hsiao

Journal of Materials Processing Tech. > 2006 > 177 > 1-3 > 150-153

An investigation into the compression forming of a billet using the commercial code SUPERFORM is developed. The work-piece of the ring billet compressed between the upper and lower dies is meshed by a hexagon rigid-plastic element. The numerical simulation based on the FEM is also compared to results obtained with the slab method. In the slab method analysis, the stress distribution of the work-piece...

article

Study on the twist compression forming of cylinder based on the upper bound and slab methods

Ching-Jyi Chen, Gow-Yi Tzou, Ming-Nan Huang

Journal of Materials Processing Tech. > 2006 > 174 > 1-3 > 266-271

In this work, slab method and upper bound method are proposed to investigate the twist compression forming of cylinder. Both upper bound method and slab method assume the friction between the cylinder and the die as constant shear friction (τ=mk). The total power rate of the energy consumption with a 3D velocity field based on the upper bound method is constructed. An optimum variable parameter is...

article

Two analytical models of double-layer clad sheet compression forming based on the upper bound and the slab methods

Hung-Hsiou Hsu, Gow-Yi Tzou

Journal of Materials Processing Tech. > 2003 > 140 > 1-3 > 604-609

This study aims at the formulations of double-layer clad sheet compression forming based on the upper bound and the slab methods. Assuming the frictions between the upper and lower dies and the clad sheet are constant shear friction, which can be different. Making use of the upper bound method can get the shape of the outer surface, the effective strain distribution, and the compression force. However,...

article

Analytical modified model of the cold bond rolling of unbounded double-layers sheet considering hybrid friction

Gow-Yi Tzou, Ming-Nan Huang

Journal of Materials Processing Tech. > 2003 > 140 > 1-3 > 622-627

An analytical modified model of the cold bonding rolling of unbounded double-layers sheet is formulated to obtain the stress field of the double-layers sheet at the roll gap via the direct derivation without using Runge–Kutta numerical method. Generally Coulomb friction at the interface of unbounded sheets and between rolls and double-layers sheet are assumed. However, when the frictional coefficient...

article

Study on minimum thickness for asymmetrical hot-and-cold PV rolling of sheet considering constant shear friction

Gow-Yi Tzou, Ming-Nan Huang

Journal of Materials Processing Tech. > 2001 > 119 > 1-3 > 229-233

The minimum thickness for the asymmetrical hot-and-cold PV rolling of sheet is proposed theoretically. With view to deriving the minimum thickness, the complete formula on general asymmetrical hot-and-cold rolling of sheet is derived by an analytical approach based on the slab method with constant shear friction. Two analytical models for the minimum thickness for hot-and-cold PV rolling are established,...

article

Study on the minimum thickness for the asymmetrical PV cold rolling of sheet

Gow-Yi Tzou, Ming-Nan Huang

Journal of Materials Processing Tech. > 2000 > 105 > 3 > 344-351

The study mainly aims at the asymmetrical PV1PV is the pull velocity required to let two neutral points reach the exit and entrance of the roll gap by applying front and back tension. ¹ cold rolling of sheet to investigate the minimum thickness. For the purpose of deriving the minimum thickness, the complete equation for asymmetrical cold rolling of sheet is derived by an analytical approach...

article

Relationship between frictional coefficient and frictional factor in asymmetrical sheet rolling

Gow-Yi Tzou

Journal of Materials Processing Tech. > 1999 > 86 > 1-3 > 271-277

Generally, two kinds of surface frictional states can be used, i.e. Coulomb friction (τ=μp) and constant shear friction (τ=mk) in analyzing asymmetrical sheet rolling. The relationship between frictional coefficient and frictional factor in asymmetrical sheet rolling is worthy of investigation. In this study, a relationship between frictional coefficient and frictional factor is proposed. Researchers...

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Search results for: Gow-Yi Tzou

Study on rotating compression forming of double-layer clad ring considering Coulomb friction

Effect of plastic anisotropy on the limit load of highly undermatched welded specimens in bending

Investigation of a slab method analysis and FEM simulation on rotating compression forming of ring

Study on the twist compression forming of cylinder based on the upper bound and slab methods

Two analytical models of double-layer clad sheet compression forming based on the upper bound and the slab methods

Analytical modified model of the cold bond rolling of unbounded double-layers sheet considering hybrid friction

Study on minimum thickness for asymmetrical hot-and-cold PV rolling of sheet considering constant shear friction

Study on the minimum thickness for the asymmetrical PV cold rolling of sheet

Relationship between frictional coefficient and frictional factor in asymmetrical sheet rolling

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