Back to Search
Start Over
DMA based characterization of stiffness reduction in long fiber reinforced polypropylene.
- Source :
-
Polymer Testing . Apr2018, Vol. 66, p296-302. 7p. - Publication Year :
- 2018
-
Abstract
- This paper describes an experimental technique based on dynamic mechanical analysis (DMA) that is shown to be useful in separating nonlinear viscoelastic effects from the characterization of irreversible stress-induced damage responsible for stiffness reduction in fiber-reinforced polymer composites. In this work, we characterize the damage evolution of polypropylene (PP) reinforced with long, discontinuous glass fibers (GF) produced by the Direct Long-Fiber Thermoplastic/Compression Molding (D-LFT/CM) process. The experimental technique is comprised of three phases: 1) dynamic stabilization at low load to measure the time-dependent storage and loss moduli, followed by 2) a frequency sweep to provide rate-dependent viscoelastic properties and 3) a quasi-static application of a peak load. These three phases are repeated with the peak load of Phase 3 increased in each iteration. Experimental results for D-LFT/CM PP/GF30 presented here show a direct correlation between peak load and the irreversible stiffness reduction. Furthermore, the stabilization phase following peak load application is shown to lead to a stiffness recovery of up to 40% due to nonlinear viscoelastic recovery. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01429418
- Volume :
- 66
- Database :
- Academic Search Index
- Journal :
- Polymer Testing
- Publication Type :
- Academic Journal
- Accession number :
- 128395536
- Full Text :
- https://doi.org/10.1016/j.polymertesting.2017.12.025