Fatigue Fracture Mechanisms of Particle and Fiber Filled PTFE Composites

Gan, Yong X.; Aglan, H.; Faughnan, P.; Bryan, C. J.

doi:10.1177/073168401772678553

Cited by 9 publications

(2 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Consequently, the reduction in impact energy corresponds not only to the reduction of plastic zone size but also to the changes in the strain to failure of the highly restricted plastic zones between the fibers, associated with interfacial interactions. 32,[35][36][37][38][39] In fiber-reinforced polymer composites, the reduction of matrix plasticity (plasticity penalty), induced by the presence of stiff and brittle fibers, needs to be compensated by extrinsic toughness-improving mechanisms of the fibers. In relatively tough matrices reinforced with fibers, the plasticity penalty due to toughness reduction of the matrix might be more than offset by the fiber-shielding toughening; thus, the ultimate impact strength reduces.…”

Section: Resultsmentioning

confidence: 99%

Extrinsic toughening of recycled carbon fibers in polypropylene composites in the absence of plasticity penalty

Ghanbari

Jalali

Nofar

et al. 2022

Journal of Composite Materials

View full text Add to dashboard Cite

Advanced composite materials used in high-tech fields are widely reinforced with carbon fibers. One of the growing application areas for carbon fibers is their reinforced composites which are used to replace metallic automotive parts. This reduces carbon footprint through weight reduction, which is a strategy pursued globally to reduce the environmental impacts of passenger vehicles. In this study, we assess the reinforcement potential of recycled carbon fibers in a polypropylene (PP) homopolymer with high strength and flowability. The highly crystalline PP homopolymer with low impact properties was used to minimize intrinsic plasticity penalty associated with fiber reinforcement and ascribe the impact strength enhancement solely to extrinsic toughening mechanisms. The reinforced composites are manufactured through extrusion compounding followed by injection molding. Modification of the transition phase connecting the bulk matrix with the bulk carbon fibers led to 78% enhancement in the strength of the composites, compared to the unmodified composites, without any loss in other properties. Compared to a commercial steel bonnet, the compatibilized composites reinforced with recycled carbon fibers exhibited superior specific strength accompanied by ∼87% weight reduction. Morphological analysis showed that all the extrinsic toughening mechanisms are effectively used by the recycled fibers in the reinforced composites.

show abstract

Section: Resultsmentioning

confidence: 99%

Extrinsic toughening of recycled carbon fibers in polypropylene composites in the absence of plasticity penalty

Ghanbari

Jalali

Nofar

et al. 2022

Journal of Composite Materials

View full text Add to dashboard Cite

show abstract

“…The mechanical properties of polymers were significantly improved by the addition of fiber and particle reinforcement. Gan et al [43] discussed the role of PTFE as a filler in fatigue fracture mechanisms. The target composites were a silica particle filled with PTFE and a glass fiber filled with PTFE.…”

Section: Polytetrafluoroethylene (Ptfe) As Coatingsmentioning

confidence: 99%

Fatigue Analysis of Actuators with Teflon Impregnated Coating—Challenges in Numerical Simulation

Kang

Ouyang

2021

Actuators

View full text Add to dashboard Cite

Actuators are essential components for motion in machines, and warranty service lives are basic specifications of actuators. However, fatigue damage or wear of actuators are very complex and related to many design factors, such as materials properties, surface conditions, loads, and operating temperature. Actuator manufacturers still rely heavily on physical experiments to determine the fatigue lives of actuators. This paper investigates the state-of-the-art of using numerical simulations for fatigue analysis of mechanical actuators. Failure criteria of machine elements are discussed extensively; existing works on using finite element methods for machine element designs are examined to (1) explore the feasibility of using a numerical simulation for fatigue analysis and (2) discuss the technical challenges in practice. Moreover, a systematic procedure is suggested to predict fatigue lives of mechanical actuators with Teflon impregnated hard coatings. A virtual fatigue analysis allows for optimizing a mechanical structure, reducing design verification costs, and shortening the development time of actuators.

show abstract

Crystalline phase transformation of polytetrafluoroethylene in a fatigue test

Yang

Zhi

et al. 2014

J of Applied Polymer Sci

View full text Add to dashboard Cite

In this study, we aimed to characterize the mechanical response of polytetrafluoroethylene (PTFE) laminates under a tension–tension load‐control fatigue test (frequency = 5 Hz, load ratio = 0) and provided an analysis of the failure patterns of the PTFE material with consideration of crystalline phase transformation. In the final results, the evolution of the cyclic creep strain and stress–number of cycles to failure (S–N) curves presented duplex properties accompanying the fatigue life increasing to high cycles (cycle fatigue > 105). A simple phenomenological damage index was defined in this study to describe the cyclic creep process. Additionally, the scanning electronic machine investigation suggested that local fibrosis caused by crystalline phase transformation to phase I led to the initiation of fatigue crack, and the fiber formation and orientation was found to be beneficial to a higher tensile strength and better resistance to crack propagation. The aspect of cyclic‐load‐induced crystallization was observed by the microfocus hard X‐ray diffraction beamline from a new insight. The crystalline phase transformation led to a gradient distribution of crystallinity and lateral crystallite size along the crack propagation direction. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41113.

show abstract

Fatigue Fracture Mechanisms of Particle and Fiber Filled PTFE Composites

Cited by 9 publications

References 32 publications

Extrinsic toughening of recycled carbon fibers in polypropylene composites in the absence of plasticity penalty

Extrinsic toughening of recycled carbon fibers in polypropylene composites in the absence of plasticity penalty

Fatigue Analysis of Actuators with Teflon Impregnated Coating—Challenges in Numerical Simulation

Crystalline phase transformation of polytetrafluoroethylene in a fatigue test

Contact Info

Product

Resources

About