Fatigue Testing: Calculating ΔK vs da/dN from R & Max Stress

  • Thread starter Thread starter arehman1289
  • Start date Start date
  • Tags Tags
    Fatigue Testing
AI Thread Summary
The discussion focuses on calculating ΔK versus da/dN for a Single Edge Notched Tension (SENT) sample in fatigue testing. The user seeks guidance on plotting these values using data from different R and maximum stress readings, referencing ASTM E647 for assistance. A suggestion is made to consult MIL-HDBK-5H, which, despite being superseded, contains valuable information and is accessible online. The handbook includes a figure that summarizes a step-by-step process for the calculations. This resource may provide the necessary clarity to complete the lab report effectively.
arehman1289
Messages
11
Reaction score
0
Hello Everybody,

Im doing my lab report on Fatigue testing for a Single Edge Notched Tension (SENT) sample and need to plot ΔK vs da/dN for a series of a vs N readings at different R and maximum stress values (attached in the picture). I've just been given one equation for Ki and told that I need to use ASTM E647 for assistance (attached equation). However after hours of going through it I was unable to figure out how to get ΔK vs da/dN from the data and information. Any step by step help would be highly appreciated. Please please.

Thanks
 

Attachments

  • WhatsApp Image 2022-11-01 at 3.50.24 PM.jpeg
    WhatsApp Image 2022-11-01 at 3.50.24 PM.jpeg
    41.3 KB · Views: 138
  • WhatsApp Image 2022-11-01 at 3.50.40 PM.jpeg
    WhatsApp Image 2022-11-01 at 3.50.40 PM.jpeg
    60.3 KB · Views: 129
Engineering news on Phys.org
There is a discussion of this starting on page 9-147 in MIL-HDBK-5H. That handbook has been superseded, but it is full of good information AND is available online. Just search MIL-HDBK-5H to find a copy. This figure summarizes two pages of step by step discussion that should help you.
DaDN.jpg
 

Thread 'A practical way to vaporize fuel for high MPG?'

Here's a video by “driving 4 answers” who seems to me to be well versed on the details of Internal Combustion engines. The video does cover something that's a bit shrouded in 'conspiracy theory', and he touches on that, but of course for phys.org, I'm only interested in the actual science involved. He analyzes the claim of achieving 100 mpg with a 427 cubic inch V8 1970 Ford Galaxy in 1977. Only the fuel supply system was modified. I was surprised that he feels the claim could have been...
View full post »

Thread 'Technical Analysis on Titan Sub (Titanic Sub)'

TL;DR Summary: Heard in the news about using sonar to locate the sub Hello : After the sinking of the ship near the Greek shores , carrying of alot of people , there was another accident that include 5 tourists and a submarine visiting the titanic , which went missing Some technical notes captured my attention, that there us few sonar devices are hearing sounds repeated every 30 seconds , but they are not able to locate the source Is it possible that the sound waves are reflecting from...
View full post »
Thread 'Turbocharging carbureted petrol 2 stroke engines'

Thread 'Turbocharging carbureted petrol 2 stroke engines'

Hi everyone, online I ve seen some images about 2 stroke carbureted turbo (motorcycle derivation engine). Now.. In the past in this forum some members spoke about turbocharging 2 stroke but not in sufficient detail. The intake and the exhaust are open at the same time and there are no valves like a 4 stroke. But if you search online you can find carbureted 2stroke turbo sled or the Am6 turbo. The question is: Is really possible turbocharge a 2 stroke carburated(NOT EFI)petrol engine and...
View full post »

Similar threads

Extracting mechanical properties from strain-stress plot (real test)
Replies
5
Views
1K
Stress concentrations: find max d and min r on stepped bar
Replies
2
Views
6K
Maximum Rod Diameter Calculation for Tension Test Specimen
Replies
10
Views
12K
Calculate force acting on a Rod with constant mass and varying length
Replies
7
Views
2K

Hot Threads

Recent Insights

Back
Top