HW_7_Bulk_Deformation_Solutions

# HW_7_Bulk_Deformation_Solutions - IE 215 HOMEWORK 7 Bulk...

This preview shows pages 1–2. Sign up to view the full content.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: IE 215 HOMEWORK 7 Bulk Deformation Solutions 19.14. A cylindrical part is warm upset forged in an open die. The initial diameter is 45 mm and the initial height is 40 mm. The height after forging is 25 mm. The coefficient of friction at the diework interface is 0.20. The yield strength of the work material is 285 MPa, and its flow curve is defined by a strength coefficient of 600 MPa and a strain-hardening exponent of 0.12. Determine the force in the operation (a) just as the yield point is reached (yield at strain = 0.002), (b) at a height of 35 mm, (c) at a height of 30 mm, and (d) at a height of 25 mm. Use of a spreadsheet calculator is recommended. Solution: (a) V = π D 2 L /4 = π (45) 2 (40)/4 = 63,617 mm 3 Given ε = 0.002, Y f = 600(0.002) 0.12 = 284.6 MPa, and h = 40 - 40(0.002) = 39.92 A = V/h = 63,617/39.92 = 1594 mm 2 K f = 1 + 0.4(0.2)(45)/39.92 = 1.09 F = 1.09(284.6)(1594) = 494,400 N (b) Given h = 35, ε = ln(40/35) = ln 1.143 = 0.1335 Y f = 600(0.1335) 0.12 = 471.2 MPa V = 63,617 mm 3...
View Full Document

## This note was uploaded on 01/24/2011 for the course IE 215 taught by Professor Groover during the Fall '08 term at Lehigh University .

### Page1 / 2

HW_7_Bulk_Deformation_Solutions - IE 215 HOMEWORK 7 Bulk...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online