{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

HW7 - ME363 HW7 1 Fall 2011 No due date The tensile...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
ME363 HW7 Fall 2011 No due date 1. The tensile strength of a part produced by powder metallurgy can be empirically related to porosity as follows: 0 nP UTS UTS e = where P is the volume fraction of pores in solid, UTS 0 is the tensile strength at zero porosity, and the exponent ranges between 4 and 7 (assume to be 4 in this case). A fully dense ceramic has the properties of UTS 0 =180 MPa, E 0 = 300 GPA and density of 4000 kg/m 3 . (a) After compaction, it reaches 70% of the density of the solid material. If the linear shrinkage is 5% during sintering, determine the density after sintering. (b) Determine the UTS and modulus of elasticity of this material after sintering. 2. A ceramic has k 0 = 0.8 W/mK. If this ceramic is shaped into a cylinder with a porosity distribution given by ( )( ) 0.1 / 1 / , P x L x = L where x is the distance from one end of the cylinder and L is the total length, plot the porosity as a function of distance, evaluate the average porosity, and calculate the average thermal conductivity.
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern