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
give me assinment for Bearing material

what are the essentials of a good steam generator?

Clutch free play : Check for free play of the clutch lever. It should be within 10-20 mm.

A counter flow heat exchanger is used to cool 2000kg/hr of oil(Cp= 2.5 KJ/Kg K) from 105 o C to 30 o C by the use of water entering at 15 o C. If the overall heat transfer coeff

comment on types of air blast chiller (not freezer)

a) A carbide tool with mild steel work piece was found to give life of 2hours while cutting at 50 mpm. Calculate the tool life if the same tool is used at a speed 25% higher than p

Q1. A short vertical column consists of a channel section with the dimensions shown in Figure 1(a). The column (part of a system used to support a machine) carries a compressive p

(a) A spring mass system has a period 0.25 sec. What will be the new period if spring constant is increased by 50% ? (b) A vibratory system in a vehicle is to be prepared with t

Transmission System: In a two-wheeler, the transmission system means the whole arrangement that transmits the power from the engine crankshaft to the rear wheel.

Carno t Theorem: No heat engine operating in cycle between the two given thermal reservoir, having fixed temperature can be more efficient than reversible engine operating be