Browse Publications Technical Papers 2001-01-0428
2001-03-05

Spot Weld Failure Loads under Combined Mode Loading Conditions 2001-01-0428

Failure loads of spot welds are investigated under static and impact loading conditions. A test fixture was designed and used to obtain maximum loads of spot welds under a range of combined opening and shear loads with different loading rates. Optical micrographs of the cross sections of spot welds before and after failure were obtained to understand the failure processes under various loading rates and different combinations of loads. The experimental results indicate that under nearly pure opening loads, the failure occurs along the nugget circumferential boundary. Under combined opening and shear loading conditions, the failure starts from the tensile side of the base metal near the nugget in a necking/shear failure mode. The effects of sheet thickness and combined load on the load carrying behavior of spot welds are investigated under static and impact loading conditions based on the experimental results. An engineering failure criterion is proposed to characterize the failure loads of spot welds under combined opening and shear loads for both static and impact loading conditions. The engineering failure criterion is expressed as a function of the nugget size, the sheet thickness, the loading angle for characterization of combined loads, and an empirical coefficient for a given loading rate.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Failure Modeling of Spot Welds Under Complex Combined Loading Conditions for Crash Applications

2002-01-2032

View Details

TECHNICAL PAPER

Modeling and Testing of Spot Welds under Dynamic Impact Loading Conditions

2002-01-0149

View Details

TECHNICAL PAPER

The Ignored Failure Mode:Spot Weld Under In-Plane Rotation (Physical Test)

1999-01-3212

View Details

X