The forming of superplastic sheet metal

Cornfield, G.C.; Johnson, R. H.

doi:10.1016/0020-7403(70)90075-5

Cited by 147 publications

(38 citation statements)

References 5 publications

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“…A number of theoretical analyses of forming operations using materials which obey equation 1 have been presented [110][111][112] and experimentally verified. These results are important if widespread application is to be achieved, and process design is to be effective.…”

Section: Applications Of Superplasticitymentioning

confidence: 99%

Superplasticity: A review

et al. 1970

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Section: Applications Of Superplasticitymentioning

confidence: 99%

Superplasticity: A review

et al. 1970

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“…Similarly the strain rate is known to vary considerably during constant pressure forming and its nature of variation appears different at the apex and at the edge of the bulge [7]. The extent of thickness variation during forming is a strong function of the peak strain rate sensitivity index (m) of the material and the increase in latter reduces the thickness variation in the formed component [8,9]. In view of this, most of the reported research works on superplastic forming were concentrated on the development of variable pressure cycle (pressure versus time curves) for blow forming in order to deform the sheet (where it experiences maximum strain) at the strain rate associated with the peak m value [10,11].…”

Section: Introductionmentioning

confidence: 99%

Effect of layered microstructure on superplastic forming property of AA8090 Al–Li alloy

Pancholi

Kashyap

2007

Journal of Materials Processing Technology

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“…However, it is difficult to exclude the friction effect which exists between the tool and workpeice and the friction condition might affect the material characterization. Free bulging test [3,4,5] was also suggested to enhance the tensile test, and is similar to the cone cup test. But the test pressure changes continuously during the test in order that constant strain rate conditions can be obtained.…”

Section: Introductionmentioning

confidence: 99%

Material characterization of duplex stainless steel by superplastic free bulging test

Lee

2012

Materialwissenschaft Werkst

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Macroscopic superplastic behaviour of metallic or non metallic materials is usually represented by the strain rate sensitivity, and it can be determined by tensile tests at elevated temperature. However, a uniaixal stress state occurs in the test whilst a multiaixal stress state is induced in actual superplastic forming processes. The difference of the stress state might affect the reliability of the strain rate sensitivity obtained from the tension test. In the current study, the material characterization of duplex stainless steel, UNS S31803, has been carried out to determine the strain rate sensitivity throughout superplastic free bulging test under constant pressure. The measured height of bulged plate during the test was transformed into strain rate and stress corresponding to height at each time by theoretical considerations. The strain rate sensitivities were calculated for each pressure level. After calculating the strain rate sensitivity and strength coefficient for each test case, the flow stress equations have been employed in the finite element simulation to verify the experiments. The bulged height obtained from the simulation showed a reasonable agreement with the experimental findings. In the future, if a study on the effect of fillet radius of test tool and microstructure evolution is carried out, it is thought that the reliability of the material characterization by superplastic free bulging test can be enhanced.

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The forming of superplastic sheet metal

Cited by 147 publications

References 5 publications

Superplasticity: A review

Superplasticity: A review

Effect of layered microstructure on superplastic forming property of AA8090 Al–Li alloy

Material characterization of duplex stainless steel by superplastic free bulging test

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