Effect of preliminary loading on the deformation and strength properties of high-strength fibres

Tsobkallo, E. S.; Nachinkin, O. I.; Kvartskheliya, V. A.

doi:10.1007/bf02430480

Cited by 2 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Influence of stretching and drawing on the surface and structure of the PP films were discussed in some studies which involved generally the effect of the stretching conditions in the production stages of boPP films . However, except few studies which dealt with the effect of the level of preliminary deformation on the stiffness of the oriented PP fibers there is not any detailed study investigating the effect of preliminary extensions following stress relaxation on the uniaxial tensile properties of boPP films and the strain recovery process in long time.…”

Section: Introductionmentioning

confidence: 99%

Effect of strain level on stress relaxation and recovery behaviors of isotactic biaxially oriented polypropylene films

Bozdoğan

Aksakal

Koç

et al. 2015

J of Applied Polymer Sci

View full text Add to dashboard Cite

The long-term recovery process and the changes in the uniaxial tensile properties and in the structure of isotactic biaxially oriented polypropylene (i-boPP) films after pre-extended at strain levels ranging from 1% up to 130% at room conditions were examined by using tensile testing, Fourier transform infrared spectroscopy/attenuated total reflectance, atomic force microscopy, and X-ray diffraction methods. It is significantly observed that the pre-extended i-boPP films at strain levels from 1% to 6% recovered completely back to their initial lengths and tensile properties. However, the i-boPP films showed a very slow recovery process and obtained very high remaining deformations changing with time which indicates irreversible structural processes after they were extended at higher strain levels. In order to predict the remaining deformation or length and the characteristics of the recovery process at any time, the linear equation of strain with respect to log time was proposed. The reasons for the changes in the tensile properties, the morphology, and the structure of the pre-extended i-boPP films were examined in detail.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of strain level on stress relaxation and recovery behaviors of isotactic biaxially oriented polypropylene films

Bozdoğan

Aksakal

Koç

et al. 2015

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

Effect of elevated temperature and humidity on fibers based on 5-amino-2-(p-aminophenyl) benzimidazole (PBIA)

et al. 2020

View full text Add to dashboard Cite

Soft body armor is typically comprised of materials such as aramid. Recently, copolymer fibers based on the combination of 5-amino-2-(p-aminophenyl) benzimidazole (PBIA) and PPTA were introduced to the body armor marketplace. The long-term stability of these copolymer fibers have not been the subject of much research, however they may be sensitive to hydrolysis due to elevated humidity because they are condensation polymers. Efforts to evaluate the impact of environmental conditions on fiber strength is very important for the adoption of these materials in armor systems. Three PBIA-based fibers were selected for the study, and were aged at 25 °C, 75% RH; 43 °C, 41% RH; 55 °C, 60% RH; and 70 °C, 76% RH for up to 524 days. Molecular spectroscopy, scanning electron microscopy, and single fiber tensile testing were performed to characterize changes in their chemical structure, tensile strength, and failure strain as a function of exposure time to different conditions. The fibers were all found to have some reduction in strength at high humidity conditions, with an approximately 14% reduction for the copolymers and a 29% reduction for the homopolymer. Molecular spectroscopy revealed some changes which suggest that hydrolysis of the benzimidazole ring is occurring at these elevated temperatures, possibly explaining the observed change in strength.

show abstract

Effect of preliminary loading on the deformation and strength properties of high-strength fibres

Cited by 2 publications

References 0 publications

Effect of strain level on stress relaxation and recovery behaviors of isotactic biaxially oriented polypropylene films

Effect of strain level on stress relaxation and recovery behaviors of isotactic biaxially oriented polypropylene films

Effect of elevated temperature and humidity on fibers based on 5-amino-2-(p-aminophenyl) benzimidazole (PBIA)

Contact Info

Product

Resources

About