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
Q. Basic type of Polymer? Polymer can be divided into three broad divisions: plastics, fibers, and elastomers. Synthetic resins are usually referred to as plastics. Plastic der

An ideal gas is heated at fixed volume until its temperature is 3 times the original temperature. It is then expanded isothermally till it reaches original pressure. The gas is t

basic idea in designing of aircraft ejection seat

Illustrates about the term rectangular footings? RECTANGULAR FOOTINGS: The design of rectangular footings is similar to that of the square footings. The major difference is

what is the formula for measuring the safe speed to drive for a cyclist

Cases of equilibrium: What are cases of equilibrium? Sol.: As a result of the acting forces, the body may be having one of the following states: (1) The body can mo


Q. Patching touch up stick? Pipe requiring limited coating repair resulting from scars, slivers, holidays, etc. shall be repaired by an OWNER approved patching system. The amou

Applications. The  welding  process  finds  widespread  applications  in almost all branches of industry and construction. fabrication and creation of steel structures

I have Four (4) questions related to Kinematics and Dynamics of Machinery . I need them exactly after 30 hours. Thanks and please do let me know.