Characterization of the thermo-mechanical behaviour of Hemp fibres intended for the manufacturing of high performance composites

By Vincent Placet. 2009

220 citations recorded by the source corpus.

Abstract In this paper, the thermo-mechanical behaviour of hemp fibres ( Cannabis sativa L . ) is investigated by means of a dynamic mechanical analyser. Experiments were performed at a frequency of 1 Hz, over the temperature range between 20 °C and 220 °C. When a periodic stress is applied to an elementary fibre, an increase in its rigidity and a decrease in its damping capacity are observed. These changes in its mechanical properties tend to stabilize after an identified number of cycles, thus providing evidence of an “adaptation” phenomenon. This specific mechanical behaviour certainly involves biochemical and/or structural modifications, such as microfibril reorientation, in the material’s organisation. In addition, the behaviour of hemp fibres is affected by temperature, which acts not only as an activation factor, but also as a degradation factor with respect to the visco-elastic properties of the fibres. The rigidity and endurance of the fibres are highly affected by thermal treatment at temperatures above 150 °C, and up to 180 °C. Taking these results into account, polypropylene–hemp fibre composites were manufactured using a specific processing cycle. By respecting the integrity of the fibres during manufacturing, it is found that with such composites, comparatively high performance can be achieved with some specific mechanical properties. This is highly encouraging for applications requiring high mechanical performance.

Subfields: Mechanics of Materials, Polymers and Plastics

View Paper: https://www.semanticscholar.org/paper/b4325a627694726a39135a812719a677929a6e7b

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Mechanics of Materials

1. M. Boubakar
2. O. Cissé
3. Mingzhong Zhang
4. Navid Ranjbar
5. A. Bledzki
6. O. Faruk
7. H. Fink
8. Vincent Placet

In Polymers and Plastics

1. A. Bledzki
2. O. Faruk
3. H. Fink
4. M. Sain
5. Vincent Placet
6. M. Boubakar
7. O. Cissé
8. Mingzhong Zhang

Citations in the corpus

• Nonlinear tensile behaviour of elementary hemp fibres. Part I: Investigation of the possible origins using repeated progressive loading with in situ microscopic observations (2014, background): “Indeed, this nonlinear tensile behaviour has been observed by many authors in wood [2,3,1215], and also in plant fibres such as flax [16-18] and hemp [6,7,19].”
• Relationships between micro-fibrillar angle, mechanical properties and biochemical composition of flax fibers (2013, unknown): “In addition to these flax fibers, the mechanical properties of hemp fibers [21] are indicated.”
• A comparative study of fatigue behaviour of flax/epoxy and glass/epoxy composites (2012, unknown): “Placet [7] in his study concerning the thermo-mechanical behaviour of hemp fibres by means of dynamic mechanical analysis from 20 to 200 C, has reported a storage modulus increase of 60%.”
• Biocomposites reinforced with natural fibers: 2000–2010 (2012, background): “Hemp fibers subjected to quasi-static tensile experiments and temperature-controlled harmonic tests revealed a complex behavior, involving several mechanisms [254].”
• Fiber-reinforced geopolymer composites: A review (2020, background): “flax fiber [104] and hemp fiber [105]), as shown in Fig.”
• New developments in fiber hemp (Cannabis sativa L.) breeding (2015, background): “In polymer reinforcement or iocomposites, surface characteristics and finesses are important ber traits that influence the interfacial bond strength between the bers and the matrix (Gamelas, 2013), as well as the fiber tensile trength (Placet, 2009).”