Tensile Modulus By X-Ray Diffraction: Instrument and Method
Final rept. Jul 1986-Jun 1990
WRIGHT RESEARCH AND DEVELOPMENT CENTER WRIGHT-PATTERSON AFB OH
Pagination or Media Count:
The design and use of an automated device to measure the axial tensile modulus of high modulus fibers by following the change in the meridional X-ray spacings as a function of applied tension is reported. The device, which mounts on a Picker 4-circle automated diffractometer, applies tension to the fiber sample by a cantilever arrangement. Tension, which is measured by a strain gauge bridge on the cantilever arm, is adjusted and read by the control computer, a VAX 11730. The device can also be used to study sample orientation as a function of tension. Techniques applicable to modulus measurements on a variety of man-made and natural fibers are discussed. The examples include rigid-rod polymer materials, polyparaphenylene benzobisthiazole PBZT, and polyparaphenylene benzobisoxazole PBO, carbon fibers with various degrees of order, KEVLARTM 149, and degummed silk.
- Polymer Chemistry