A student is planning to perform a bending operation as shown in the schematic below. The upper and bottom die will close to bend the sheet metal. Prior to the operation, the student performed a tensile test using the same material. A specimen of Æ20 mm diameter was used, and the final failure diameter was Æ17.5 mm. Failure at two locations, (A) and (B), are of interest. R is the corner radius of the dies.
![1978_media_20a_20aa4740-a19a-46a6-b3b5-f94ac112d2dd_phptTdenC.png](https://secure.tutorsglobe.com/CMSImages/1978_media_20a_20aa4740-a19a-46a6-b3b5-f94ac112d2dd_phptTdenC.png)
Estimate the largest engineering strain experienced by the sheet metal during the operation.
Is this bending operation feasible without sheet failure?