An Experimental Methodology to Characterize the Uniaxial Fracture Strain of Sheet Metals Using the Conical Hole Expansion Test
Source abstract
Abstract
The conical hole expansion test (HET) with a machined hole can induce a proportional stress state of uniaxial tension at the edge to large strains which can be exploited for fracture characterization of metals. However, the effects of material anisotropy and necking on the test are unclear as the hole shape may become non-circular with non-uniform thinning distribution. Furthermore, a general methodology is required to correlate the hole dimensions at fracture to the local strains as digital image correlation (DIC) techniques cannot be used at the hole edge. The conventional hole expansion ratio (HER) is not directly suitable for input into finite-element models of forming and crash. To these ends, a comprehensive experimental numerical study was performed to evaluate the mechanics of the conical HET using two steels: a DP1180 with mild anisotropy and moderate ductility, and a CP800 with high in-plane anisotropy and local ductility. It is demonstrated that the fracture strains can be better estimated using the local diameter at the outer hole edge or outer hole expansion ratio (OHER) as it remains in uniaxial tension. The hole shape and thinning distribution are found to be a consequence of anisotropy and not localized necking. A novel experimental methodology is then proposed to better estimate the local fracture strain from the hole geometry that was accurate with respect to the strains in the finite-element models to within 1% for DP1180 at an HER of 66% and to within 4% for CP800 at an HER of 190%.
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Research context
OpenAlex topics: Metal Forming Simulation Techniques · High-Velocity Impact and Material Behavior · Fatigue and fracture mechanics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (36)
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