Abstract
A punching test for simply estimating the tensile strength and total elongation of steel sheets and formed parts was proposed. The tensile strength and total elongation were estimated from the shear stress at the maximum punching load and percentage of the burnished depth at the sheared edge of the slug measured without cutting, respectively. For a variety of steel sheets with a range of the tensile strength from 360 to 1500 MPa, linear functions for the estimation were experimentally obtained. The correlation of the estimated tensile strength of the steel sheets with the measured one from the uniaxial tensile test was considerably high, and the correlation of the estimated total elongation was high. The distributions of tensile strength and total elongation for hot- and cold-stamped parts were estimated. The proposed punching test is available under not only a laboratory environment but also a factory environment.
Highlights
A variety of parts used in automobiles, trains, aircrafts, farm equipment, office equipment, furniture, house appliances, computers, etc. are formed from sheets such as steel, aluminium, copper, magnesium, titanium and plastic
The punching load for the 980 MPa sheet sharply drops after attaining the maximum load, whereas the long peak of load appears for the mild steel sheet
It was found that the tensile strength of the steel sheet having a thickness between 1 and 2 mm can be estimated from the shear stress at the maximum punching load with high accuracy
Summary
A variety of parts used in automobiles, trains, aircrafts, farm equipment, office equipment, furniture, house appliances, computers, etc. are formed from sheets such as steel, aluminium, copper, magnesium, titanium and plastic. Li et al [13] obtained the stress-strain curve of an ultra-high strength steel sheet for a comparatively large deformation from the tensile test of a slitted specimen. It is easy to estimate the tensile strength from the small punch test, a fracture test is necessary for the estimates of the total elongation and reduction of area representing the ductility In shearing processes such as punching and blanking, the sheets are separated by the initiation and progress of cracks, and these processes utilise a fracture phenomenon. A punching test for estimating the tensile strength and total elongation of sheet metals and formed parts was proposed. The proposed test is to estimate the tensile strength and total elongation under a factory environment by applying a punching process classified into sheet metal forming
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