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Improving Hole Expansion Ratio by Parameter Adjustment in Abrasive Water Jet Operations for DP800
Journal Article
05-11-03-0023
ISSN: 1946-3979, e-ISSN: 1946-3987
Sector:
Topic:
Citation:
Behrens, B., Diaz-Infante, D., Altan, T., Yilkiran, D. et al., "Improving Hole Expansion Ratio by Parameter Adjustment in Abrasive Water Jet Operations for DP800," SAE Int. J. Mater. Manf. 11(3):241-252, 2018, https://doi.org/10.4271/05-11-03-0023.
Language:
English
Abstract:
The use of Abrasive Water Jet (AWJ) cutting technology can improve the edge
stretchability in sheet metal forming. The advances in technology have allowed
significant increases in working speeds and pressures, reducing the AWJ
operation cost. The main objective of this work was to determine the effect of
selected AWJ cutting parameters on the Hole Expansion Ratio (HER) for a DP800
(Dual-Phase) Advanced High-Strength Steel (AHSS) with
s0 = 1.2 mm by using a fractional factorial
design of experiments for the Hole Expansion Tests (HET). Additionally, the
surface roughness and residual stresses were measured on the holes looking for a
possible relation between them and the measured HER. A deep drawing quality
steel DC06 with s0 = 1.0 mm was used for reference.
The fracture occurrence was captured by high-speed cameras and by Acoustic
Emissions (AE) in order to compare both methods. Results indicated that using,
regardless of the material, a small standoff distance, high water pressure, and
slow traverse speed and cutting the sample underwater will delay the fracture in
a hole expansion operation. Furthermore, the AE have proven to be adequate to
measure cracks when optical methods are not feasible. In conclusion, based on
the impact of the aforementioned parameters, it is possible to select,
appropriately, the AWJ operation parameters to achieve the edge stretchability
required for each forming process.