Warm-Forming of Light-Weight Alloys under Multi-Stage Forming Process

Lai, Chi Ping; Chan, Luen Chow; Chow, C. L.; Yu, Kai Ming

doi:10.4028/www.scientific.net/amr.83-86.88

Cited by 3 publications

(3 citation statements)

References 9 publications

(11 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All experimental and computed damage parameters will then input into a general purpose finite element software package which considered the materials properties for further failure analysis. All measured stress-strain data for the weldment, base metal, the computed damage variables, and forming limit curves [13] were extended and able to predict the localized necking of the Ti-TWBs, taking the weldment effect into fully account into. The measured results shown in Figures 4 -6 and were imported to the simulation for further failure analysis.…”

Section: Advances In Engineering Plasticity XIImentioning

confidence: 99%

Finite-Element Modeling of Thermal Forming of Ti-TWBs with Experimental Verification

Lai

Chan

2014

KEM

View full text Add to dashboard Cite

The titanium tailor-welded blanks (Ti-TWBs) are being developed in different industries such as automobile and aerospace, combining the advantages of both tailor-welded blanks technology and titanium alloys. In recent decades, computer simulation of sheet metal forming processes has been employed increasingly over conventional production test and adjustment methodology to achieve the optimum and cost-effective operation procedures. Recently, certain amounts of theoretical analysis for the sheet metal forming process have been developed. However, these analyses could not be applied directly to the material under multi-stage forming process. Thus, some researchers have developed a damage-based model to predict the instability and failure of sheet metals, particularly for the above Ti-TWBs, with consideration of material damage under discontinuous or proportional loading strain paths. So far this model has been used and proved to be successful to predict formability of selected sheets of steel and aluminium alloy. However, the application of the damage-coupled model has yet to be extended to the Ti-TWBs under thermal multi-stage forming operation.The main objective of this paper is to investigate numerically the formability of Ti-TWBs under multi-stage forming process with experimental verification. Titanium alloy sheets (Ti-6Al-4V) in thickness of 0.7mm and 1.0mm were selected and laser-welded the specimen of Ti-TWBs. The model based on the damage mechanics is introduced to predict the thermal formability of Ti-TWBs with change of strain paths. In this study, the anisotropic damage model incorporate with the finite element codes and user-define material subroutine were developed to predict the formability of Ti-TWBs with change of strain paths. The mechanical properties and damage parameters of Ti-TWBs for the simulation were measured experimentally. The simulation of Ti-TWB under multi-stage forming process were then conducted and validated experimentally at similar forming conditions. The predicted results have been found to agree well with those obtained from the experiments. This analysis can be applied readily to design and manufacture TWB components or structures so as to satisfy the need of such market demands.

show abstract

Section: Advances In Engineering Plasticity XIImentioning

confidence: 99%

Finite-Element Modeling of Thermal Forming of Ti-TWBs with Experimental Verification

Lai

Chan

2014

KEM

View full text Add to dashboard Cite

show abstract

“…Studies by Lai [12], Takalkar [13] and Pourkamali Anaraki [14] show the possibilities and challenges of multi-stage forming processes. Depending on the operation and process route, different stress conditions and thus forming requirements arise for the individual tool stages.…”

Section: Introductionmentioning

confidence: 99%

Development of a process chain for multi-stage sheet metal forming of high-strength aluminium alloys

Günzel

Hauß

Gaedigk

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

The high-strength aluminium alloys EN AW-6082 and -7075 are characterized by low density and high strength but also limited cold formability and pronounced springback behaviour in the ultra-high-strength T6 state. In order to exploit their lightweight design potential, temperature-supported process routes such as warm or hot forming are applied. Alternatively, there is the possibility of cold forming preconditioned semi-finished products at the expense of the initial material properties. Common to all variants are complex interrelationships due to linked plant periphery resulting from up- and downstream heat treatments. In addition, occurring heat transfers in temperature-supported process routes or strain hardening effects during cold forming lead to reduced formability. Especially for multi-stage forming processes, as they are required for complex components, the above-mentioned process routes reach their limits. The different requirements of the four single-stages (deep drawing, blanking, collar drawing and upsetting) for the production of a demonstrator geometry with adapted wall thicknesses make a new type of temperature control necessary. This paper shows that the combination of temperature-supported and multi-stage forming contributes to a significant increase in formability. The temperature-controlled forming tool used for this purpose enables an inline heating of the components during the process, so that an industrially feasible and economical overall process chain for the fabrication of the demonstrator geometry out of those alloys is convertible.

show abstract

“…Therefore, Ti sheet applications can be limited especially when high deformations or complex parts are considered [6]. In order to overcome these limitations, [7] proposed a multistage forming process while [8] studied the effect of temperature in reducing the tensile/yield strengths ratio of the material so to reduce the elastic recovery of the part.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Method for the Analysis of Warm Titanium Sheet Stamping of an Automotive Component

Fiorentino

Ceretti

Giardini

2015

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

Product design involves many aspects as geometry and material or mechanical requirements that have to be chosen on the base of the part requirements. Manufacturing process is the link between them representing a fundamental aspect of the product design process. Designers and technicians have a consolidated set of tools and knowledge based on long time experience, but the request of more new performing products characterized by more complex geometries or harder to form materials as Titanium alloys stimulated the use of numerical models. They allow us to study the product feasibility but they require reliable inputs for their development and validation. The present research focuses on sheet stamping processes and proposes a methodology that uses the Nakazima test to characterize the formability of the material and to develop and validate the model. In particular, the method is applied to cold (20 ∘ C) and warm (300 ∘ C) stamping of a complex automotive component made of CP Titanium. After characterizing the material and validating the model at the different temperatures, the stamping process is studied and results are compared. In particular, this approach allowed joining the experimental tests required to develop and validate the model, therefore reducing the resources required for the product design.

show abstract

Warm-Forming of Light-Weight Alloys under Multi-Stage Forming Process

Cited by 3 publications

References 9 publications

Finite-Element Modeling of Thermal Forming of Ti-TWBs with Experimental Verification

Finite-Element Modeling of Thermal Forming of Ti-TWBs with Experimental Verification

Development of a process chain for multi-stage sheet metal forming of high-strength aluminium alloys

Experimental and Numerical Method for the Analysis of Warm Titanium Sheet Stamping of an Automotive Component

Contact Info

Product

Resources

About