Recent content by phydis

I can describe what happens in plastic deformation using line defects. And I need a that level explanation for elastic deformation and reduction of area.

In the tensile test practical for ductile materials, up to the elastic limit, the deformation is recoverable (no line defects). My question is can there be a reduction of area with the elastic deformation? If yes, how it happens? I'm a beginner. Thank you!

in energy curve, it should be increasing, but it doesn't with your values, anyway it seems that the transition is gradual for that material, so it's quite difficult to determine the transition temperature.

Why we use v-notch in charpy impact test ?

Why Mild Steel has two Yield Points ? :confused:

" If a plane has more than 2 principal axes (axes of symmetry ) through a point, then every axis through that point must be a principal axis " I can understand above statement regarding a circle, but square also has more than 2 principal axes, how can it be true for every axis of a square or a...

[ [(p-->q) and (r-->s)] and (~q or ~s) ] --> (~p or ~r) I know all basic theories in Logic and I want to know the correct way/correct steps of proving this kind of things? I'm a beginner.. please help I can explain above dilemma in words, but I have no idea how to write down the proof correctly.

got it. Thanks everyone!

is E = {(-2)^5}^(1/5) a complex number ? my cal gives E=(-2), but this gives 1.61+1.78i http://www.wolframalpha.com/input/?i=%28%28-2%29^%285%29%29^1%2F5 someone please explain this..

According to the way of my thinking ||axb|| = ||a||||b||sinx is enough to represent magnitude of axb for all x angle. let n be an unit vector perpendicular to both a and b vectors. therefore we get, ||axb|| = || ||a||||b||sinx n || when x > 0, ||axb|| = ||a||||b||sinx ||n|| since ||n|| = 1 ...

assume x= 11∏/6 , then smallest angle between a and b ∏/6, but when applying it to x it should be -∏/6. shouldn't it? (if it shouldn't then why?) are ||sin(-∏/6)|| and sin(-∏/6) equivalent?

if two forms are equivalent then ||sinx||= sinx (where x is the smallest angle between a and b) how can you explain this?

if x is the smallest angle between a and b, when n is the unit vector perpendicular to both a and b, axb = ||axb||n am i correct?

a and b are two vectors and x is the angle between them. ||axb|| = ||a||||b||sinx ------(1) ||axb|| = ||a||||b||||sinx|| ------(2) which one is correct? why?

Here as shown in the diagram, (1)Is Ixy zero for plane ABCD symmetrical along X axis? If yes, how it happens? (2)How can we calculate Ixy for the plane PQRS ? Ixy = the product of moment of area. Thanks!