Prestressing techniques and arrangements

Details Prestressing techniques and arrangements Prestressing techniques and arrangements

1987-06-02

1992-03-03

Kutach Aftergut, Karen D.

Plastic and nonmetallic article shaping or treating: processes

Forming stressed concrete articles

264229, 264230, 264231, B28B 100, B29C 6102, B29C 6104, B29C 6106

Patent

active

050930656

ABSTRACT:
A prestressing arrangement and technique for the manufacture of prestressed bodies or structures includes shape memory material members. According to one aspect of the invention, the prestressing arrangement includes a tensile member in series with a shape memory material member. The formable material is shaped around the members and fixed in form. The shape memory material is then shrunk by heating it above its characteristic threshold temperature, placing the members in tension and the fixed material in compression. According to another aspect, the shape memory material member is secured in a tube. Prestressing is achieved in the tubular prestressing arrangement by lengthwise expansion of the shape memory material member prior to fixing the material of the body being formed, and then after fixation, releasing the stress on the shape memory material member, leaving the tube in tension to exert compressive forces on the fixed material.

REFERENCES:
patent: 2414011 (1947-01-01), Billner
patent: 2667068 (1954-01-01), Viehe et al.
patent: 3167882 (1965-02-01), Abbott
patent: 3297819 (1967-01-01), Wetmore
patent: 3676968 (1972-07-01), Campbell
patent: 3786806 (1974-01-01), Johnson et al.
patent: 3960995 (1976-06-01), Kourkene
patent: 4233690 (1980-11-01), Akins
patent: 4267139 (1981-05-01), Scheibe et al.
Schetky, L. McDonald, "Shape Memory Alloys", Scientific American, 241:5, pp. 74-82 (1979).
Schetky, L. McDonald, "Shape Memory Effect Alloys For Robotic Devices", Robotics Age, pp. 13-17, Jul. 1984.
"Memrytec.TM. Designs and Products", Memory Metals, Inc. Publication.

Affiliated with

Also associated with

Rating

Prestressing techniques and arrangements does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Prestressing techniques and arrangements, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Prestressing techniques and arrangements will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-270590