Ultrasonic Drilling of Polymeric Composites

Author(s):  
J. Ramkumar ◽  
S. K. Malhotra ◽  
R. Krishnamurthy
Author(s):  
E. Bischoff ◽  
O. Sbaizero

Fiber or whisker reinforced ceramics show improved toughness and strength. Bridging by intact fibers in the crack wake and fiber pull-out after failure contribute to the additional toughness. These processes are strongly influenced by the sliding and debonding resistance of the interfacial region. The present study examines the interface in a laminated 0/90 composite consisting of SiC (Nicalon) fibers in a lithium-aluminum-silicate (LAS) glass-ceramic matrix. The material shows systematic changes in sliding resistance upon heat treatment.As-processed samples were annealed in air at 800 °C for 2, 4, 8, 16 and 100 h, and for comparison, in helium at 800 °C for 4 h. TEM specimen preparation of as processed and annealed material was performed with special care by cutting along directions having the fibers normal and parallel to the section plane, ultrasonic drilling, dimpling to 100 pm and final ionthinning. The specimen were lightly coated with Carbon and examined in an analytical TEM operated at 200 kV.


2017 ◽  
Vol 3 (4) ◽  
pp. 64-68
Author(s):  
V. A. Bannyi ◽  
A. I. Savitsky ◽  
L. I. Kramoreva ◽  
E. S. Petrova ◽  
D. B. Kulikovich ◽  
...  

Author(s):  
S. Vinodh kumar ◽  
K. Prasanth ◽  
M. Prashanth ◽  
S. Prithivirajan ◽  
P. Anil Kumar

Author(s):  
Karthik Babu ◽  
Oisik Das ◽  
Vigneshwaran Shanmugam ◽  
Rhoda Afriye Mensah ◽  
Michael Försth ◽  
...  

Abstract3D printing or additive manufacturing (AM) is considered as a flexible manufacturing method with the potential for substantial innovations in fabricating geometrically complicated structured polymers, metals, and ceramics parts. Among them, polymeric composites show versatility for applications in various fields, such as constructions, microelectronics and biomedical. However, the poor resistance of these materials against fire must be considered due to their direct relation to human life conservation and safety. In this article, the recent advances in the fire behavior of 3D-printed polymeric composites are reviewed. The article describes the recently developed methods for improving the flame retardancy of 3D-printed polymeric composites. Consequently, the improvements in the fire behavior of 3D-printed polymeric materials through the change in formulation of the composites are discussed. The article is novel in the sense that it is one of the first studies to provide an overview regarding the flammability characteristics of 3D-printed polymeric materials, which will further incite research interests to render AM-based materials fire-resistant.


2021 ◽  
Vol 113 ◽  
pp. 106553
Author(s):  
Vivek Pratap ◽  
Amit K. Soni ◽  
Himangshu B. Baskey ◽  
S.M. Abbas ◽  
A.M. Siddiqui ◽  
...  
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