Calculate number of cycles to fracture, Mechanical Engineering

Calculate number of cycles to fracture:

If the plastic deformation is taken into consideration calculate number of cycles to fracture in above Example.

Solution

Δ K I eff / Δ K I =  0.5 + 0.4 R

where, R =smin/smax = 30 /70 =0.43 and Δ K = 71√a

Δ KI eff = 71√a (0.5 + 0.4x0.43)

= 71 x 0.67√a 47.67 √a N/mm2

∴                      da /dN = 10- 8  (47.67  )2.0 = 2.273 x 10- 5 a

∴                  1718_Calculate number of cycles to fracture.png

∴          N f= 44003 x ln 146.14 /35= 44003 x 1.43 = 62890 cycles

Note that due to plastic deformation in crack tip zone there is more than 100% increase in fatigue life.

Posted Date: 1/23/2013 3:11:00 AM | Location : United States







Related Discussions:- Calculate number of cycles to fracture, Assignment Help, Ask Question on Calculate number of cycles to fracture, Get Answer, Expert's Help, Calculate number of cycles to fracture Discussions

Write discussion on Calculate number of cycles to fracture
Your posts are moderated
Related Questions
Calculate tension in limbs: Q : A horizontal drum of belt drive carries the belt over semicircle around it. It is rotated counter clockwise to transmit a torque of 300N-m. If

Define Principal Process for Electron Beam Machining A beam of electrons is emitted from the electron gun which is basically following three points. 1. A cathode whic


Mas s Flow Rate (m ): In absence of any mass getting stored system we can write; Mass flow rate at inlet = Mass flow rate at outlet That is, m f1  = m f2 as m f  = d

Resultant of Non-coplanar Force System: The resultant of a system of coplanar forces can be attained by adding up two forces through law of parallelogram at a time and after t

Spark Plug: A spark jumps between the electrodes of the spark plug when the voltage developed by the ignition system reaches the required value. This electrical spark occurs at a

to find a horizontal force acting on a body which is inclined to the plane with a particular angle

CAPP for Forming Processes Sheet metal parts are produced from flat sheets on presses using special metal forming dies. Process planning for sheet metal parts involves complex


Q. Module Assembly Site Preparation? To set a module on the piles installed on project site, the following preparations shall be made: The Designer shall provide design elev