Correlation of tensile properties with plane-strain, limiting dome height
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While no single test can predict the formability of sheet metal under all modes of deformation, the planestrain limiting dome height (LDH0) has been shown to correlate with material performance during stretching. However, because LDH0 values are a relatively new measure of formability, and require specialized equipment to measure, such data are not commonly available. Thus it was considered desirable to determine whether a reasonable correlation exists between LDH0 and tensile properties. The latter can be measured more readily or, alternatively, are routinely generated by suppliers. A comparison of LDH0 and transverse tensile data from nineteen steel samples, eleven aluminum samples, and a zinc sample demonstrated that LDH0 correlates best with the total elongation. Further, all the data can be represented by a straight line whose equation is: LDH0(mm) = 10.0 + 0.508 × [Total Elongation (pct)] with a standard error of estimate of 1.62 mm for 50.8 mm gage length specimens of ASTM E-8 configuration. Additional refinement of the goodness-of-fit through incorporation of planar anisotropy was investigated for some of the steel samples. It was found that r (as opposed to r0 or r90) yielded the greatest improvement in goodness-of-fit and that a high r was detrimental to a high LDH0 value.
KeywordsDual Phase Steel Total Elongation Uniform Elongation Minor Strain Planar Anisotropy
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