will placing magnets in repel mode will demagnetize them.

[grogmark]

well thanks to all of you

its worth hanging around here just for the encouragement, its a great forum

mark

[Dingus Mungus]

Magnets in repel and attract mode will last for the same ammount of time, but that time is based on materials. The things that will kill a magnet quicker are heat, impact, and large changing fields in proximity; And the rate at which those factors effect a material varries based on materials. Lots of variables effect lifetime, but not the one you're looking at. Unless you mean +-+-+- then coercivity would be the factor to examine.

http://www.dextermag.com/Permanent-Magnet-Materials.aspx?
Lots of info about industrial magnetic materials.
coefficient of coercivity = ability of a field to influence its field.
currie temp = temp which results in the loss of all field.
Modulus of Rupture = impacts ability to divide domains.

~Dingus Mungus

[Dingus Mungus]

Something to note in respect to Modulus of Rupture is that the effect stacks meaning 100 impacts low momentum will equal one large impact at high momentum. So even repeatedly tapping a magnet will eventually degauss the magnet in less time than if left static.

~Dingus Mungus

[Ergo]

Try this link, grogmark.
http://www.overunity.com/index.php/topic,2751.0.html

[Ergo]

http://www.dextermag.com/Permanent-Magnet-Materials.aspx?
Lots of info about industrial magnetic materials.
coefficient of coercivity = ability of a field to influence its field.
currie temp = temp which results in the loss of all field.
Modulus of Rupture = impacts ability to divide domains.

~Dingus Mungus

That link points to nothing of  interest.
Please post a direct link to the coefficient of coercivity.