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
For an automotive component of your choice that is traditionally metallic, review how it could be re-engineered as a composite? How factors such as fibre & matrix type, fibre volum

A cantilever beam of 1800 mm length is subjected to point loads of 3.5 kN, 4.3 kN, 1.2 kN and 2.8 kN at distances of 400 m, 400 m, 400 m 300 m and 300 m, respectively from the fixe

Q. What is Tantalum? Tantalum is one of the most corrosion-resistant metals known. However, the high cost of tantalum has limited its commercial use as an all-purpose corrosio

Explain the process of a Pneumatic Proportional Controller and get its transfer function. What modification is needed to make it function as a proportional plus derivative controll


Explain Wilson HArtnell Governor

5. Calculate and draw the Shear force and Bending moment diagrams for the loaded beam and determine the maximum moment M and its location x from left end

BOILER CLASSIFICATION : (1 )  According to Tube Contents:   Boilers can be water tube or fire tube type. In water tube boilers water flows in tubes and in Fire Tube Boilers h

Are the types of pumps selected (base mounted, in-line)? Locate pump on discharge side of boiler. Flexible connector used. Valving indicated, isolation valve on suction and dis