Fatigue Test - ME 220 MECHANICS OF MATERIALS LAB Fatigue...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
ME 220 – MECHANICS OF MATERIALS LAB Fatigue Test Test: September 27 th , 2007 Submitted: October 4 th , 2007 Matthew Olsen Section 3
Background image of page 1

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

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3

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

View Full DocumentRight Arrow Icon
Summary Fatigue accounts for an estimated 90% of all machine failures. A failure due to fatigue is when an applied load is either removed or reversed repeatedly until the member fractures. This load will cause a failure at a stress much lower than the ultimate stress of the material. An example of this is how a wire, such as a coat hanger, can be cut by repeatedly bending a point back and forth. Given that 90% of the fatigue failures are due to improper design, it is important to test this property so that it can be accounted for in future design. The example above is called low-cycle fatigue. This type is associated with large forces causing much plastic deformation at lower frequencies. The type being tested here is of the high-cycle, which is associated with smaller forces within the elastic bounds at much higher frequencies. This will be tested by a fatigue test machine. The machine rotates the specimen along its axis. The specimen is a bar whose
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This lab report was uploaded on 02/04/2008 for the course ME 220 taught by Professor Ding during the Fall '07 term at Washington State University .

Page1 / 6

Fatigue Test - ME 220 MECHANICS OF MATERIALS LAB Fatigue...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online