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Technical Paper

Measuring the Mechanical Properties of Aluminum Sheets and Their Resistance Spot Welds at Large Strains Using Digital Image Correlation Coupled with a Modified Shear Test

2012-04-16
2012-01-0181
The constitutive behavior of aluminum alloy sheet and their resistance spot welds at large strains is critical for light weight vehicle design analysis and life prediction. However, data from uniaxial tensile tests are usually limited to small strains or by material instability. A novel technique was developed using digital image correlation coupled with a modified shear test to directly measure the stress - strain curves of aluminum alloy sheet at large strains. The modified shear sample prevents end rotation of the shear zone as compared to the ASTM B831 test. The results show that the effective stress - effective strain curves from shear tests match those obtained by uniaxial tension, but only by incorporating material anisotropy using the Barlat-Lian yield function. For the first time, the technique was applied to aluminum resistance spot welds to determine both the shear strength and stress-strain curves of spot welds at large strains.
Technical Paper

The Effect of Continuous Galvanizing Process Parameters on the User Properties of Hot-Rolled Transformation Induced Plasticity Steels

2005-04-11
2005-01-0495
A hot rolled C-Mn-Si TRIP steel was subjected to three different heat treatment schedules compatible with continuous galvanizing line capabilities and the effect of the heat treatment schedules on the microstructure and mechanical properties was determined. It was found that for heat treatment schedules employing relatively high cooling rates (6 - 9°C/s) from the intercritical annealing temperature (800°C) and short overaging times at the galvanizing bath temperature (455 - 470°C), the desired microstructure of ferrite, bainitic ferrite and high volume fraction of C-rich retained austenite was produced and the desired mechanical properties achieved.
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