1. M

    Youngs modulus E

    Hi, I need to calculate youngs modulus E from the stress v strain graph.I know its stress divided by strain but were do I read the values from.Is it the lower stress levels of the elastic zone or the upper? ie 50/0.5 or 325/1.1 =E Thanks...
  2. E

    Youngs theorum.

    Says f_{xy}=f_{yx} The original equation is f(x,y)=x^3\ln(1-xy) So for the first derivative with respect to x ,I used the product rule on first part then the quotient rule on second part to get the derivative below. f_x= 3x^2\ln(1-xy)-\frac{x^3y}{1-xy} Then for this one I just had...
  3. C

    Youngs Modulus / Tensile Strength

    Hi Guys, I have the following problem.. can anybody help me to solve it. 1. Tensile tests were carried out on two materials:- type 316 stainless steel and unplasticised polyvinyl chloride (PVC). Each test piece had original dimensions:- diameter = 14 mm gauge length = 100 mm...