Mechanics of material removal when cutting natural fiber reinforced thermoplastic composites

Abstract

is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. This is an author-deposited version published in: https://sam.ensam.eu Handle ID A B S T R A C TThis paper aims to study the machinability of natural fiber reinforced thermoplastic composites by investigating the mechanics of chip formation and the multiscale cut surface's quality induced by the orthogonal cutting process. Unidirectional flax fibers reinforced polypropylene (UDF/PP) composite has been tested by orthogonal cutting experiments. Mechanical tensile and shear tests have been conducted on UDF/PP specimens to relate the mechanical behavior to the cutting behavior. Results show that UDF/PP composites produce a continuous chip at all the considered cutting conditions. This is inherently related to the specific mechanical behavior of flax fibers inside the thermoplastic matrix under cutting solicitations. The cutting behavior induces a consequent surface damages in the form of debonding zones and uncut fiber extremities. Results demonstrate that the cutting depth has the most significant influence on the machinability after sorting the pertinent scales of the cut surface using the multiscale surface analysis approach.

New Multiscale Approach for Machining Analysis of Natural Fiber ReinforcedBio-Composites

“…In this paper, the considered NFRP sandwich part is elaborated with a thermoset matrix (Acrodur resin). However, This cutting behavior of flax fibers is similar to that demonstrated in the previous author's works [30,31,33] where the same tribo-physical phenomena that occur on flax fibers during cutting process are founded via the current industrial application (fibers deformation, interfaces cracking, uncut fiber extremities, …) regardless of the matrix nature (Acrodur or polypropylene). Thus, it can be concluded that the behavior of the plant fibers during the cutting is independent of the matrix choice (thermoset or thermoplastic) used for manufacturing the NFRP composites.…”

“…These pertinent scales correspond to the size of the fibrous structure regardless of the reinforcement structure type. This founding has been also confirmed by an orthogonal cutting investigation on UD flax fibers reinforced PP matrix [33] which proves that the multiscale behavior of NFRP composites is independent of the process type. Indeed, the intimate relationship between the relevant scales and the fibrous structure size has been previously confirmed by nanoindentation and scratch test measurements where the authors show the scale effect on the tribo-mechanical performances of flax fibers [46,47].…”

“…Unfortunately, the edge finishing of NFRP materials are difficult and still based on empirical rules because the multiscale activated physical mechanisms are still not well understood. This is why the previous works of the authors [29][30][31][32][33] have focused on the multiscale analysis of the machinability for the main structures of NFRP materials.…”

Thermal effect on the tribo-mechanical behavior of natural fiber composites at micro-scale

“…Moreover, the machinability analysis of NFRP composites requires the consideration of an appropriate analysis scale. The pertinent analysis scale for NFRP machining is related to the natural fibrous reinforcement size [17][18][19][20][21] because the tribo-mechanical response of natural fibers inside composite materials is strongly dependent on the contact scale [22][23][24]. However, the machining processes are not purely based on tribo-mechanical phenomena since the machining operations induce significant temperature increase due to the high deformation rate and high tool/material friction [25,26].…”

Mechanical Behavior of Raavi and Pineapple Fiber-reinforced Hybrid Polyester Composites

“…Mejri et al [9] prepared birch fiber and high density polyethylene composite for replacing nylon which is used in spur gear manufacturing in industries. Chegdani et al [10] studied on machinability of natural fiber-reinforced composite material by investigating the mechanics of chip formation and the multiscale cut surface by orthogonal cutting experiment. Vignesh G et al [11] prepared hybrid composite materials with kenaf, human hair as reinforcements, and epoxy resin as matrix for investigating its mechanical properties such tensile strength, flexural strength, and impact strength.…”