where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

NOVO DR
develops and manufactures cutting edge Portable Digital Radiography X-ray Inspection Systems.
1103 views
Technical Discussions
XiangYan
XiangYan
06:51 Sep-05-2008
coercive force

is the coercive force depend on the shape ? Provided two samples are made of the same material but different shape, you measure their coercive force could you end up with different results ?



 
 Reply 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 868

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
868
07:24 Sep-05-2008
Re: coercive force
In one word, YES! The lower the L/D Ratio (Length to Diameter), greater is the Coercive Force required to demagnetise the item. But shape is not the only factor. You also have to take into account such properties as heat treatment and alloying.

Cheerio's
Michel

----------- Start Original Message -----------
: is the coercive force depend on the shape ? Provided two samples are made of the same material but different shape, you measure their coercive force could you end up with different results ?
------------ End Original Message ------------




 
 Reply 
 
Catalin Mandache
Catalin Mandache
06:03 Sep-08-2008
Re: coercive force
The coercive force depends on so many micro structural factors that is very unlikely to have the same values for two identically shaped and alloyed samples.

----------- Start Original Message -----------
: is the coercive force depend on the shape ? Provided two samples are made of the same material but different shape, you measure their coercive force could you end up with different results ?
------------ End Original Message ------------




 
 Reply 
 
David Mackintosh
Engineering,
Acuren Group Inc., Canada, Joined Feb 2011, 85

David Mackintosh

Engineering,
Acuren Group Inc.,
Canada,
Joined Feb 2011
85
09:36 Sep-23-2008
Re: coercive force
----------- Start Original Message -----------
: is the coercive force depend on the shape ? Provided two samples are made of the same material but different shape, you measure their coercive force could you end up with different results ?
------------ End Original Message ------------

The coercive force, Hc, is the applied field required to demagnetize a material after saturation. It is a material property. (See for example http://www.ndt-ed.org/EducationResources/CommunityCollege/MagParticle/Physics/HysteresisLoop.htm and http://en.wikipedia.org/wiki/Coercive_force.) The magnetic H-field required to demagnetize a specific object depends on the material properties, the shape of the object, and the method of applying the field, among other things. Hc for the material and the demagnetizing force required for a specific object are related, but it is not always easy to calculate one from the other.

David



 
 Reply 
 

Product Spotlight

Navic - Steerable Modular Automated Scanner

The Navic is a modular, motorized, steerable scanner designed to carry multiple attachments used
...
in various scanning and inspection applications. The Navic is capable of weld scanning (girth welds and long seam welds), automated corrosion mapping, and tank scanning.
>

Ultrasonic Testing Immersion Tanks with Unmatched Scanning Features

TecScan’s non-destructive testing Ultrasonic Immersion Tanks & scanners are designed for high pe
...
rformance and demanding NDT testing applications. Our Scan3D™ line of High Precision Immersion Tanks are specifically designed for automated ultrasonic testing of complex composites parts used in aerospace and industrial applications.
>

NDTkit RT

NDTkit RT, TESTIA's Digital Radiography software The NDTkit product line software for X-ray analysi
...
s. NDTkit RT is a software benefiting from the Ultis kernel which is dedicated to radiographic image analysis. It offers a set of tools and filtering processes to assist RT operators in finding relevant flaws.
>

Immersion systems

ScanMaster ultrasonic immersion systems are designed for high throughput, multi shift operation in a
...
n industrial or lab environment. These fully integrated systems provide various scanning configurations and incorporate conventional and phased arrays technologies to support diverse applications, such as inspection of disks, bars, shafts, billets and plates. All of ScanMaster immersion systems are built from high accuracy scanning frames allowing for scanning of complex parts and include a multi-channel ultrasonic instrument with exceptional performance. The systems are approved by all major manufacturers for C-scan inspection of jet engine forged discs. Together with a comprehensive set of software modules these flexible series of systems provide the customer with the best price performance solutions.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window