Test specimen/jaw assembly that exhibits both self-resistive and

Details Test specimen/jaw assembly that exhibits both self-resistive and Test specimen/jaw assembly that exhibits both self-resistive and

1991-01-18

1993-04-13

Reynolds, Bruce A.

Electric heating

Metal heating

219 1047, 219 1073, 219 1057, 374 50, 374 51, 73760, 73766, 73790, G01N 318, H05B 300

Patent

active

052025420

ABSTRACT:
Apparatus either for a specimen that is to be held in a jaw assembly of, for example, a dynamic thermal-mechanical testing system or for the jaw assembly itself wherein the specimen or jaw assembly, respectively, exhibits both self-resistive and self-inductive heating whenever a sufficiently large alternating (AC) electrical current is passed serially therethrough. In one embodiment, the specimen (200, 300) is fabricated from a material which undergoes self-resistive heating and in which suitable levels of eddy currents can be induced by and also includes an appropriately shaped heating section (205, 206; 305, 306) situated near each of two opposing ends thereof. In another embodiment, a metallic conductor (403, 403'; 503) is fabricated from a material which undergoes self-resistive heating, in which suitable levels of induced eddy currents can occur and which contains appropriately shaped and sized heating sections (406, 407; 406', 407'; 512, 512'). Such a conductor is situated in each jaw assembly (401, 401'; 500). Each conductor abuts against and is in electrical contact with an opposing end-face of a specimen. Whenever current is passed through either embodiment, these heating sections (205, 206; 305, 306; 406, 407; 406', 407'; 512, 512') will exhibit both self-resistive and self-inductive heating wherein the amount of additional heat generated through self-induction and propagating into the ends of the specimen can be set to compensate for heat loss that would otherwise occur from the ends of the specimen into the neighboring jaw assembly thereby assuring that substantially no longitudinal temperature gradients are established either along the mid-span region of the specimen or along the entire specimen while heating current passes therethrough. The size and shape of each such heating section governs the amount of additional heat that will be generated therein.

REFERENCES:
patent: 2426985 (1947-09-01), Darmara
patent: 3100253 (1963-08-01), O'Connor
patent: 3772492 (1973-11-01), Brogden et al.
patent: 4627259 (1986-12-01), Andersson et al.
patent: 4788396 (1988-11-01), Maugein et al.
patent: 5055648 (1991-10-01), Iceland et al.
Hiroo Suzuki, "Heater For Metal Sample", Patent Abstracts of Japan, vol. 4, No. 51 (Apr. 17, 1980).
Derwent Publications, Ltd., "As UKR Strength Problems", Soviet Inventions Illustrated, Section EI, Week 8932 (Sep. 20, 1989).

Affiliated with

Also associated with

Rating

Test specimen/jaw assembly that exhibits both self-resistive and does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Test specimen/jaw assembly that exhibits both self-resistive and, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Test specimen/jaw assembly that exhibits both self-resistive and will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1156945