Forming limit analysis for two-stage forming of 5182-O aluminum sheet with intermediate annealing

In the plastic deformation of hexagonal metals, deformation twinning plays an important role as well as slip deformation. Therefore, a modelling of deformation twinning is essential in the crystal plasticity modeling. In this study, a model considering the volume fraction of deformation twinning is presented in the framework of crystal plasticity, and it is combined with a finite element-based homogenization scheme to represent the polycrystalline behavior. The presented model is adopted to a sheet necking formulation. Plastic flow behaviors under several strain paths are evaluated using the present framework, and the effect of volume fraction of deformation twinning on the formability of hexagonal metal is discussed.

Download Full-text

Effects of Punch Cross-Section on Deep-Drawability of Square Shell of Aluminum Sheet

Journal of Engineering for Industry ◽

10.1115/1.3187139 ◽

1987 ◽

Vol 109 (4) ◽

pp. 355-361 ◽

Cited By ~ 14

Author(s):

N. Kawai ◽

T. Mori ◽

H. Hayashi ◽

F. Kondoh

Keyword(s):

Crack Initiation ◽

Cross Section ◽

Pure Aluminum ◽

Metal Flow ◽

Aluminum Sheet ◽

Forming Limit ◽

Planar Anisotropy ◽

Deep Drawability ◽

Commercially Pure ◽

Relief Effect

Effects of product shape and a planar-anisotropy on a square shell drawability were studied, using commercially pure aluminum sheet. Two phenomena were mainly considered to affect a forming limit: (a) the prevention of crack initiation at the corner of a punch by adjacent straight punch profile regions, (b) the metal flow in the flange region from the corner to the straight side, the “Strain Relief Effect,” which serves to decrease the deformation at the corner.

Download Full-text

Anisotropic fracture forming limit curve and its applications for sheet metal forming with complex strain paths of aluminum sheet

The International Journal of Advanced Manufacturing Technology ◽

10.1007/s00170-021-07357-z ◽

2021 ◽

Author(s):

Taratip Chaimongkon ◽

Sansot Panich ◽

Vitoon Uthaisangsuk

Keyword(s):

Sheet Metal ◽

Sheet Metal Forming ◽

Metal Forming ◽

Aluminum Sheet ◽

Forming Limit ◽

Limit Curve ◽

Forming Limit Curve ◽

Anisotropic Fracture ◽

Strain Paths ◽

Complex Strain

Download Full-text

Influences of Vibration Parameters on Formability of 1060 Aluminum Sheet Processed by Ultrasonic Vibration-Assisted Single Point Incremental Forming

Advances in Materials Science and Engineering ◽

10.1155/2019/8405438 ◽

2019 ◽

Vol 2019 ◽

pp. 1-12

Author(s):

Mingshun Yang ◽

Lang Bai ◽

Yan Li ◽

Qilong Yuan

Keyword(s):

Ultrasonic Vibration ◽

Incremental Forming ◽

Single Point ◽

Aluminum Sheet ◽

Forming Limit ◽

Single Point Incremental Forming ◽

Experimental Platform ◽

Formed Part ◽

Vibration Parameters ◽

Forming Angle

With increasing design complexities of thin-walled parts, the requirement of enhanced formability has impeded the development of the single point incremental forming (SPIF) process. In the present research, the ultrasonic vibration-assisted single point incremental forming (UV-SPIF) method was introduced to increase the formability of sheet metals. AL1060 aluminum alloy was adopted as the experimental material, and a truncated cone part was considered as the research object. The simulation model of UV-SPIF was established to analyze the distribution of plastic strains in the formed part. A forming angle was selected as the measuring index of formability of the aluminum sheet, and the influences of different vibration parameters on formability were evaluated. An experimental platform was devised to verify the accuracy of the obtained simulation results. It was found that ultrasonic vibration effectively improved the forming limit of the sheet. When the amplitude was 6 µm and the frequency was 25 kHz, the sheet yielded the best formability with the largest forming angle of 67 degrees.

Download Full-text