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Determination of Edge Fracture Limit Strain for AHSS in the ISO-16630 Hole Expansion Test

Alexander BarloDept. of Mechanical Engineering, Blekinge Institute of Technology, Karlskrona, SwedenM SigvantDept. of Mechanical Engineering, Blekinge Institute of Technology, Karlskrona, SwedenVili KestiSSAB Europe Oy, Raahe, FinlandMd Shafiqul IslamDept. of Mechanical Engineering, Blekinge Institute of Technology, Karlskrona, SwedenQuoc Thien PhamDept. of Mechanical Engineering, Blekinge Institute of Technology, Karlskrona, SwedenJohan PilthammarDept. of Mechanical Engineering, Blekinge Institute of Technology, Karlskrona, Sweden

2023en

ABI

Annotatsiya

Abstract With the increased demand for application of sustainable materials and lightweight structures, the sheet metal forming industry is forced to push existing materials to the limits. One area where this is particular difficult is when it comes to assessing the formability limit for sheet edges. For decades, the ISO-16630 Hole Expansion Test (HET) has been the industry standard for expressing the edge formability of sheet metals through the Hole Expansion Ratio (HER). However, in recent years, this test has been criticized for its high scatter in results for repeated experiments. This scatter has been suspected to be caused by the operator-reliant post-processing of the test, or variations in the cutting conditions for the different test specimens. This study investigates the impact of shifting the evaluation point of the test from the through-thickness crack to the onset of surface failure on the reported scatter, as well as performs inverse modeling of the Hole Expansion Test to obtain an edge limit strain value.

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DOI: 10.1088/1757-899x/1284/1/012027

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