Abstract
To understand better on edge cracking in sheet metal forming, the edge preparation methods, edge topological characteristics, and its evolution in uniaxial tension are investigated. Tensile specimens were prepared by waterjet cutting, milling, and EDM methods. The as-machined and fractured edges were measured with a Laser Scanning Confocal Microscope (LSCM (Keyence VK-9710), which provides statistical roughness parameters and raw data of surface 3D surface geometry at up to 1nm z-direction resolution, allowing topological analysis The edge evolution during tensile straining was reported achieved by interrupted tensile tests at different strains, and replication of the edge surfaces without unloading using a metallurgical replica technique, for post-measurement after the tests. The quality of the three edge preparation methods and the effect on edge cracking in tension are investigated.
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