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
SETTING-UP AN ENTERPRISE :  Setting up an Enterprise begins with an idea but it happens after understanding detailed guidelines and manuals on how to start up an enterprise includ

What are the primary benefits of using computerized layout procedures vs. Systematic Layout Planning (SLP) procedures done by hand?

Q. Corrosive properties of caustic? Sodium hydroxide, more commonly known as Caustic Soda or simply ‘Caustic', is widely used in the petrochemical industry to neutralize acidic


Q. Define FLARE AND VRU SYSTEM? VRU, HP and LP Flare systems are used to collect normal and emergency releases from the process and recycle or dispose of them in a safe manner.

Q. Corrosion resistance of the nickel-based alloys? The corrosion resistance of the nickel-based alloys can also be significantly affected by other variables such as velocity a

Determine the enhance in volume of the vessel: A thin spherical vessel of diameter 800 mm and thickness 6 mm is filled through a liquid at an internal pressure of 1.5 N/mm 2 .

Grinding & Brushing: Grinding is process there has an abrasive wheel that rotating at certain speed to smooth a surface or to give an even finish on material. In this Blade pr

Advantages of resistance welding   1. Resistance welding is very fast compared to arc welding. 2. Almost any combination of metals can be resistance welded provided necessa

use of productin drawing in manufacturing technolagy