Fatigue testing machine Fatigue Group :- Abed Al Salam Hammouz Ahmad Abaza Ala’ Mustafa Mohammad...
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Transcript of Fatigue testing machine Fatigue Group :- Abed Al Salam Hammouz Ahmad Abaza Ala’ Mustafa Mohammad...
Fatigue testing machine
Fatigue Group :-Abed Al Salam HammouzAhmad AbazaAla’ MustafaMohammad Bahish
Supervised by :-Dr. Ahmad Al Ramahi
Outline
•Part one Review.
•Design stage.
•Manufacturing and Assembly
•Testing and documentation
•Cost analysis and further work
Part One Review
•Literature review about fatigue
•Preliminary design
Preliminary Design - Specimens
• Four point clamping test specimen .
• Three point clamping test specimen .
Preliminary Design – Life Estimation
Stress based approach :
1 10 100 1000 10000 100000 1000000 10000000 100000000150
1500
350
588.14
350
700588.14
The Expected S-N diagram for AISI 1050 - Theoretically
low Cycle Fatigue Power (low Cycle Fatigue ) High Cycle Fatigue Power (High Cycle Fatigue ) Infinte life
Number of load cycles
Fati
gue s
trength
Project Stages
Fatigue Testing Machin
e
Design
Fabrication
Testing
Design stage
1. Machine Functions and Layout.
2. Design Calculation.
Machine Functions and Layout
Rotating bending
Cantilever
Rotating bending test•Put the specimen under pure bending
moment
Rotating bending test
Forcing method using dead weights.
F/2F/2
Rotating Bending
Rotating Bending
Cantilever
Cantilever
Manufacturing and Assembly Used Manufacturing processes
Welding
Turning
Milling
video
Manufacturing Challenge
Machine Features •Ease of use.
Machine Features •It has a good flexibility.
Electrical Circuit
•Ease of operate machine.
•Control the time of experiment .
•Give accurate results for number of
cycles to failure .
•Support safety for both user and
machine .
Electrical Circuit
Electrical Circuit
Safety mode
•The motor does not work until:
•The main switch is ON.
•Emergency switch and (ON/OFF switch)
are ON.
•Cover of the motor is completely closed.
Electrical Circuit
Accuracy in reading results
•To get the accuracy in results.
• The normally open limit switches are ON.
• The normally closed limit switches are
ON.
• Then sensor feeds signals.
Electrical Circuit
•Open limit switches are ON means the
cover of the motor is closed, the house is
not aligned, does not happen any failure
in the specimen.
•Closed limit switches are ON means, the
contactor start connecting, and there is a
load affecting on the specimen.
Electrical Circuit
•When start getting signals from the
sensor,
•counter counting until the specimen
fails, then:-
•The motor stop rotating,
• Sensor stop feeding with signals,
•And the counter holds the values on.
Cost analysis and similar machines
Comparison criteria
Our Fatigue Testing Machine(FTM)
Other manufacturer (OM)
Marks
Cost 2500 $ 12,000 $ FTM
Machine functions
Three types of tests.
One type. FTM
Productivityexperience
Lake of experience, first trial.
Professional work.
FTM
Specimen Forming
Specimen Forming
•video
Polishing
Testing and Documentation •Testing operation
Testing and Documentation
1 10 100 1000 10000 100000 1000000 10000000 100000000150
1500
Experimental Results Plotted on Theoretically obtained S-N Curve
low Cycle Fatigue Power (low Cycle Fatigue ) High Cycle Fatigue Infinte life Test No. 1 Test No. 2 Test No.3
Number of load cycles
Fati
gue s
trength
Thanks