Abstract
In order to investigate the effects of main forming parameters on the fatigue life in incremental sheet punching, wavelength and amplitude were selected as factors, and fatigue life of truncated pyramids and virgin material was selected as indicator. The effects of the parameters were identified whereby the design of full factorial experiment, fatigue comparative test, analysis of variance, Tukey test, and t-test. It was found that wavelength and amplitude significantly affect the fatigue life. In addition, the improvement of fatigue life decreased with the increment of wavelength and increased with the increment of amplitude when it is less than a certain value, followed by decreasing.
Highlights
Incremental sheet forming (ISF) is a promising process technology for sheet metal in industry
Driven by wave tool path, incremental sheet punching (ISP) tool always imposes concentrated uniform axial forming force on the sheet, resulting in a fairly uniform distribution of compressive residual stresses along the component wall, which might explain the higher fatigue life observed for deformed material as compared to virgin material [15,25]
Due to the wave tool path, the surface strengthening effect similar to shot peening treatment will be produced by tool in the ISP, so that the residual tensile stress on the surface of the sheet is transformed into residual compressive stress, which inhibits the crack opening [26,27] and improves the fatigue life of sheet
Summary
Incremental sheet forming (ISF) is a promising process technology for sheet metal in industry. In this process ISP are allowed to achieved on life of parts through low cycles fatigue life test, which showed that SPIF parts had a longer. 0.25 other 0.8–1.2 an important basis for0.15–0.40 the reasonable selection of process parameters in0.15 subsequent research
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