
Maya PishvarCalifornia State University, Northridge | CSUN · Department of Mechanical Engineering
Maya Pishvar
Doctor of Philosophy
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25
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Publications (25)
Emerging interest to synthesize active, engineered matter suggests a future where smart material systems and structures operate autonomously around people, serving diverse roles in engineering, medical, and scientific applications. Similar to biological organisms, a realization of active, engineered matter necessitates functionality culminating fro...
The controlled orientation of short fibers on the surface of structural laminates while obtaining good dispersion and uniform spatial distribution is highly desirable. In this paper, a new magnetic field assisted fabrication method is proposed to align nickel coated carbon (NiC) fibers on the surface of ternary NiC/glass/epoxy laminates. Excellent...
Fabrication of multifunctional materials via incorporation of the third component into structural composite laminates is of great interest, especially for manipulating surface properties. However, achieving a uniform, well‐dispersed surface microstructure in ternary composites is quite challenging by using the traditional fabrication processes. In...
In recently developed magnet assisted composite manufacturing (MACM) processes, a magnetic consolidation pressure is applied on composite laminates by a set of permanent magnets during fabrication. This magnetic pressure was shown to provide considerable benefits such as increased fiber volume fraction, improved mechanical properties, and reduced v...
A novel fabrication method, Magnet Assisted Composite Manufacturing (MACM), is developed to produce high-quality composite laminates out of an autoclave. This technique involves the placement of high-temperature Neodymium permanent magnets on a vacuum bag to generate sufficiently high consolidation pressure during cure, thus eliminating the necessi...
Low frequency sound attenuation is often pursued using Helmholtz resonators (HRs). The introduction of a compliant wall around the acoustic cavity results in a two-degree-of-freedom (2DOF) system capable of more broadband sound absorption. In this study, we report the amplitude-dependent dynamic response of a compliant walled HR and investigate the...
We realize soft topological mechanical metamaterials with pronounced polar elastic responses (i.e., softer on one edge than the other) in both the quasistatic and dynamic regimes. Numerical simulations and experimental results confirm the presence of directional dependence in metamaterial response at low and high strain rates, despite the use of lo...
This paper proposes a simple and accurate technique to quantify both fiber and void volume fractions of natural fiber composites. This technique involves the separate pyrolysis of natural fibers, polymer resin, and natural fiber/polymer composite in a pure nitrogen atmosphere. The remained fractional residuals of these materials are used for the de...
Short carbon fibers have excellent mechanical properties and high electrical conductivity which make them a suitable reinforcement for polymer composites. It is well-known that the mechanical and electrical properties of polymeric composites can be tailored by controlling the orientation of these fibers. There are different methods to produce compo...
During manufacturing of high-quality composite laminates, an elevated pressure is often applied over the laminate to increase the fiber content, reduce process-induced defects, and achieve enhanced interlaminar consolidation. In processes involving a vacuum bag, such as wet lay-up and vacuum assisted resin transfer molding, the consolidation pressu...
With growing environmental awareness, natural fibers have recently received significant interest as reinforcement in polymer composites. Among natural fibers, silk can potentially be a natural alternative to glass fibers, as it possesses comparable specific mechanical properties. In order to investigate the processability and properties of silk rei...
Vacuum-assisted resin transfer molding (VARTM) has several inherent shortcomings such as long mold filling times, low fiber volume fraction, and high void content in fabricated laminates. These problems in VARTM mainly arise from the limited compaction of the laminate and low resin pressure. Pressurized infusion (PI) molding introduced in this pape...
This study presents a novel method to fabricate high-quality, large composite parts which can be used in a wet lay-up/vacuum bag (WLVB) process. The new method utilizes a commercial lifting magnet, which is commonly used for transporting ferrous plates, to apply a magnetic consolidation pressure on the WLVB composite lay-up. The pressure is applied...
Carbon fibers are widely used as reinforcement in polymer-matrix composites due to their excellent mechanical properties combined with their lightweight. Coating of short carbon fibers with nickel not only preserves the desired specific mechanical properties of both the fiber and the resulting composite but also improves their electrical conductivi...
Voids are the most common process-induced defects in composite laminates fabricated by vacuum assisted resin transfer molding (VARTM). Reduction or total elimination of these defects is essential for the improved performance and long-term durability of the structural composites. This study introduces a novel method that reduces the void content in...
Application of natural fibers in polymer composites has been gaining popularity in several industries pursuing environmentally friendly products. Among the natural fibers with proven potential applications, silk fibers have recently received considerable attention from researchers. Silk fibers provide higher mechanical properties compared to other...
This work demonstrates a protocol to improve the quality of composite laminates fabricated by wet lay-up vacuum bag processes using the recently developed magnet assisted composite manufacturing (MACM) technique. In this technique, permanent magnets are utilized to apply a sufficiently high consolidation pressure during the curing stage. To enhance...
The video component of this article can be found at https://www.jove.com/video/57254/
This paper demonstrates the feasibility of using high-power, permanent magnets in developing high consolidation pressure during a variety of fabrication methods for composite laminates. First, the salient features of this new manufacturing method, expected enhancement of the mechanical properties, and possible improvements in part quality are discu...
This paper presents the application of a new technique, Magnet Assisted Composite Manufacturing (MACM), to enhance the quality of composite laminates fabricated by wet lay-up/vacuum bag (WLVB) and vacuum assisted resin transfer molding (VARTM). Towards this goal, a set of high-power, Neodymium permanent magnets, which are placed on a magnetic tool...
A novel method, Magnet Assisted Composite Manufacturing (MACM), which utilizes a magnetic compressive pressure, is proposed to improve laminate quality in wet lay-up/vacuum bag (WLVB) processes. This paper first describes the salient features of MACM/WLVB process, and then demonstrates the effectiveness of this process by investigating the void con...