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Technical Discussions
Bruce Owen
Bruce Owen
02:32 Feb-23-2006
Detecting cracks in shell cases.

Hi Members,
Does anyone have a low cost solution to detecting fine lengthwise fatigue cracks in the inside walls of empty brass cartridge cases, typically 7.62mm shell cases.
regards, Bruce Owen.



    
 
 Reply 
 
J. Mark Davis
Teacher, And Consultant
University of Ultrasonics, Birmingham, Alabama, USA, Joined Mar 2000, 85

J. Mark Davis

Teacher, And Consultant
University of Ultrasonics, Birmingham, Alabama,
USA,
Joined Mar 2000
85
01:23 Feb-23-2006
Re: Detecting cracks in shell cases.
Bruce,

ID and OD Creeping Waves should work very effectively.

What is the thickness and diameter?

What is the critical flaw size? Any crack.?

Creeping can detect cracks of about .001 to .005.

Sincerely,

J. Mark Davis


----------- Start Original Message -----------
: Hi Members,
: Does anyone have a low cost solution to detecting fine lengthwise fatigue cracks in the inside walls of empty brass cartridge cases, typically 7.62mm shell cases.
: regards, Bruce Owen.
------------ End Original Message ------------




    
 
 Reply 
 
Joe Buckley
Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT, United Kingdom, Joined Oct 1999, 522

Joe Buckley

Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT,
United Kingdom,
Joined Oct 1999
522
01:32 Feb-24-2006
Re: Detecting cracks in shell cases.
Waht kind of depth are you expecting the cracks to be?
If 0.1mm or more then rotating eddy current probe (as used for aircraft fastener holes) would be worth trying. If they are just scratches than an enhanced (FPI?) optical method is probably the only way
Joe


----------- Start Original Message -----------
: Hi Members,
: Does anyone have a low cost solution to detecting fine lengthwise fatigue cracks in the inside walls of empty brass cartridge cases, typically 7.62mm shell cases.
: regards, Bruce Owen.
------------ End Original Message ------------




    
 
 Reply 
 
Frank
Frank
05:25 Feb-27-2006
Re: Detecting cracks in shell cases.
----------- Start Original Message -----------
: Hi Members,
: Does anyone have a low cost solution to detecting fine lengthwise fatigue cracks in the inside walls of empty brass cartridge cases, typically 7.62mm shell cases.
: regards, Bruce Owen.
------------ End Original Message ------------

If you are inspecting mass quantities of the shell casings and you suspect the cracks to be in the radius of the casing, then you may want to consider Water Washable Flourescent Penetrant. The detection of cracks in that small radius may be difficult with UT or ET due to edge effect.


    
 
 Reply 
 
M. Kim Johnson
M. Kim Johnson
06:19 Feb-27-2006
Re: Detecting cracks in shell cases.
----------- Start Original Message -----------
: Hi Members,
: Does anyone have a low cost solution to detecting fine lengthwise fatigue cracks in the inside walls of empty brass cartridge cases, typically 7.62mm shell cases.
: regards, Bruce Owen.
------------ End Original Message ------------




    
 
 Reply 
 
M. Kim Johnson
M. Kim Johnson
06:22 Feb-27-2006
Re: Detecting cracks in shell cases.
----------- Start Original Message -----------
: : Hi Members,
: : Does anyone have a low cost solution to detecting fine lengthwise fatigue cracks in the inside walls of empty brass cartridge cases, typically 7.62mm shell cases.
: : regards, Bruce Owen.
------------ End Original Message ------------

YEs. Process Controlled Resonant Testing (PCRT) should be able to handle the testing quite rapidly and accurately.

Kim


    
 
 Reply 
 

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