Characterization of the physical origins of acoustic emission (AE) from natural fiber reinforced polymers (NFRPs) machining processes

2021 ◽  
Author(s):  
Zimo Wang ◽  
Ruiqi Guo ◽  
Qiyang Ma ◽  
Faissal Chegdani ◽  
Bruce Tai ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Natural Fiber ◽  
Fiber Reinforced Polymers ◽  
Fiber Reinforced ◽  
Machining Processes ◽  
Reinforced Polymers

Characterization of the Physical Origins of Acoustic Emission (AE) From Natural Fiber Reinforced Polymers (Nfrps) Machining Processes

2021 ◽  
Author(s):  
Zimo Wang ◽  
Ruiqi Guo ◽  
Qiyang Ma ◽  
Faissal Chegdani ◽  
Bruce Tai ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
High Speed ◽  
Random Distribution ◽  
Natural Fiber ◽  
Matrix Material ◽  
Machining Process ◽  
Fiber Reinforced Polymers ◽  
Depth Of Cut ◽  
Fiber Reinforced ◽  
Reinforced Polymers

Abstract Natural fiber reinforced polymers (NFRPs) are environmentally friendly and are receiving growing attention in the industry. However, the multi-scale structure of natural fibers and the random distribution of the fibers in the matrix material severely impede the machinability of NFRPs, and real-time monitoring is essential for quality assurance. This paper reports a synchronous in-situ imaging and acoustic emission (AE) analysis of the NFRP machining process to connect the temporal features of AE to the underlying dynamics and process instability, all happen within milliseconds during the NFRP cutting. This approach allows directly observing the surface modification and chip formation from a high-speed camera (HSC) during NFRP cutting processes. The analysis of the HSC images suggests that the complex fiber structure and the random distribution introduce an unsteady, almost a freeze-and-release type motion pattern of the cutting tool with varying depths of cut at the machining interface. More pertinently, a prominent burst pattern of AE from time domain was found to emanate due to the sudden penetration of the tool into the surface of the NFRP workpiece (increasing the depth of cut), as well as a release motion of the tool from its momentary freeze position. These findings open the possibility of tracking AE signals to assess the effective specific energy and surface quality that are affected by these unsteady motion patterns.

scholarly journals Characterization of fiber matrix interface of continuous‐discontinuous fiber reinforced polymers on the microscale

PAMM ◽  
2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Benedikt Rohrmüller ◽  
Michael Schober ◽  
Kerstin Dittmann ◽  
Peter Gumbsch ◽  
Jörg Hohe
Keyword(s):  
Fiber Reinforced Polymers ◽  
Matrix Interface ◽  
Fiber Reinforced ◽  
Reinforced Polymers ◽  
Discontinuous Fiber ◽  
Fiber Matrix Interface ◽  
Fiber Matrix

Experimental Characterization of the Fiber Angles of Multiple Curved Laminate Segments Using Prepreg-Based Carbon Fiber Reinforced Polymers as a Structure for a Non-Engaging Bellows Coupling

2019 ◽  
Vol 809 ◽  
pp. 555-562
Author(s):  
Christian Oblinger ◽  
André Baeten ◽  
Klaus Drechsler
Keyword(s):  
Carbon Fiber ◽  
Rotation Axis ◽  
Fiber Reinforced Polymers ◽  
Main Task ◽  
Experimental Characterization ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced Polymers ◽  
Reinforced Polymers ◽  
Carbon Fiber Reinforced

This paper deals with the experimental characterization of the fiber angles of multiple curved laminate segments using prepreg-based carbon fiber reinforced polymers as a structure for a non-engaging bellows coupling. The main task of this generic shaft coupling is the torsionally stiff torque transmission and the compensation of axial displacement as well as the angular misalignment of metallic shafts. The multiple curved structure can be manually draped by several cut segments using epoxy-based fabric prepreg. Moreover, the intended initial fiber orientation of the laminate is ±45° with respect to the rotation axis of the structure. For the experimental determination of the local fiber angles various CFRP cut segments were defined as CFRP specimens with varying number of layers and constant width. All investigations were based on cured CFRP specimens. The measurements were performed with a robot-assisted optical surface sensor and an optical digital microscope. The influence of the manual draping process according to the z-method could be quantitatively determined by the fiber angle measurements.

scholarly journals FlexFlax Stool: Validation of Moldless Fabrication of Complex Spatial Forms of Natural Fiber-Reinforced Polymer (NFRP) Structures through an Integrative Approach of Tailored Fiber Placement and Coreless Filament Winding Techniques

2020 ◽  
Vol 10 (9) ◽  
pp. 3278 ◽  
Author(s):  
Vanessa Costalonga Martins ◽  
Sacha Cutajar ◽  
Christo van der Hoven ◽  
Piotr Baszyński ◽  
Hanaa Dahy
Keyword(s):  
High Performance ◽  
Natural Fiber ◽  
Filament Winding ◽  
Fiber Reinforced Polymers ◽  
Integrative Approach ◽  
Fiber Reinforced ◽  
Reinforced Polymers ◽  
Fiber Placement ◽  
Flax Fibers ◽  
Performance Requirements

It has become clear over the last decade that the building industry must rapidly change to meet globally pressing requirements. The strong links between climate change and the environmental impact of architecture mean an urgent necessity for alternative design solutions. In order to propose them in this project, two emergent fabrication techniques were deployed with natural fiber-reinforced polymers (NFRPs), namely tailored fiber placement (TFP) and coreless filament winding (CFW). The approach is explored through the design and prototyping of a stool, as an analogue of the functional and structural performance requirements of an architectural system. TFP and CFW technologies are leveraged for their abilities of strategic material placement to create high-performance differentiated structure and geometry. Flax fibers, in this case, provide a renewable alternative for high-performance yarns, such as carbon, glass, or basalt. The novel contribution of this project is exploring the use of a TFP preform as an embedded fabrication frame for CFW. This eliminates the complex, expensive, and rigid molds that are traditionally associated with composites. Through a bottom-up iterative method, material and structure are explored in an integrative design process. This culminates in a lightweight FlexFlax Stool design (ca. 1 kg), which can carry approximately 80 times its weight, articulated in a new material-based design tectonic.

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