What effects does friction have on a forminglimit diagram?

1.What effects does friction have on a forminglimit diagram? Explain. By the student. Friction can have a strong effect on formability. High friction will cause localized


strains, so that formability is decreased. Low friction allows the sheet to slide more easily

over the die surfaces and thus distribute the strains more evenly.

2.Why are lubricants generally used in sheetmetal forming? Explain, giving examples.

Lubricants are used for a number of reasons. Mainly, they reduce friction, and this improves

formability as discussed in the answer to Problem


find the cost of your paper

Explain why attenuation is not a big problem in PET.

Consider a 2-D object consisting of two triangle compartments, as shown in Figure P9.4. Suppose a solution containing a 511 KeV gamma ray emitting radionuclide with concentration f = 0.5….

Give the mean and the variance of the reconstructed image, mean[ˆ f(x, y)] and var[ˆ f(x, y)].

Ignoring the inverse square law and attenuation, an approximate reconstruction for SPECT imaging is given by where c˜() =  {||W()} and W() is a rectangular windowing filter that cuts off at = 0…..

Find the numerical responses in each to an event in crystal C(4, 6).

Suppose a PET detector comprises four square PMTs (arranged as a 2 by 2 matrix) and a single BGO crystal with slits made in such a way that it is….