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- W2073811700 abstract "The forming limit curve indicates the maximum uniform strain which can be achieved in an element of a sheet which is strained in a proportional biaxial straining process; it refers to the strain in a region adjacent to, but not within, any area of localized straining associated with rupture. In this work forming limit curves were determined for four different grades of mild steel; gridded test pieces were stretch formed to failure in elliptical and circular hydrostatic bulge dies. Each test was repeated twenty times for each material and each die, in order to provide data for statistical investigation of scatter in measured forming limits. It is shown that the variation in forming limits is much greater than that due to the experimental error and it is proposed that this scatter reflects an intrinsic property of the material which is important in determining material formability. A three-dimensional forming limit diagram is presented which can be used to determine the probability of failure of an element which is stretch formed to a particular strain level. The experimental data are also employed to determine the number of tests required to determine the mean forming limit curve within a specified accuracy." @default.
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- W2073811700 date "1974-01-01" @default.
- W2073811700 modified "2023-10-14" @default.
- W2073811700 title "Variability of forming limit curves" @default.
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- W2073811700 doi "https://doi.org/10.1016/0020-7403(74)90031-9" @default.
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