STRESS RELAXATION DEVICE,
Abstract
An apparatus was developed to measure the relaxation modulus in shear of viscoelastic materials. The relaxation device consists of a specimen, gage and actuating device. The specimen is a hollow cylinder bonded to concentric plastic cylinders. The inner cylinder is attached to a force gage which is used with a recording oscillograph. The outer cylinder is linked to the actuating device. The motion of the outer cylinder produces shearing stresses in the specimen. The actuating mechanism consists of a tapered beam, a catch and a device for arresting the rebound. When the catch is released, the beam attains its maximum deflection of 0.1 inch in less than a millisecond. The transient vibrations attenuate to zero in approximately 20 milliseconds, after which the relaxation function G(t) can be measured with a precision of 5%. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1963
- Accession Number
- AD0422908
Entities
People
- John M. Hurban
Organizations
- Ballistic Research Laboratory