Investigation of Oil Palm and Pineapple Fiber Reinforced Phenol Formaldehyde Composites by Acoustic Emission Technique

2003 ◽  
Vol 11 (1) ◽  
pp. 9-18 ◽  
Author(s):  
M. S. Sreekala ◽  
T. Czigány ◽  
G. Romhány ◽  
S. Thomas
Keyword(s):  
Acoustic Emission ◽  
Oil Palm ◽  
Fracture Behaviour ◽  
Phenol Formaldehyde ◽  
Composite Plates ◽  
Tensile Tests ◽  
Fiber Reinforced ◽  
Single Edge ◽  
Scanning Electron Microscopy Micrographs ◽  
Acoustic Emission Technique

The fracture mechanics response of oil palm and pineapple fiber reinforced phenol formaldehyde composites was investigated. The fracture behaviour was influenced by the fiber content, the length of the fibers and the condition of the fiber-matrix interface. Single edge notched tensile specimens were cut from composite plates and examined. The fracture toughness was determined from force-elongation curves. Tensile tests and acoustic emission investigations were carried out simultaneously. It was found out that the failure mode for untreated and treated materials was quite different. Scanning electron microscopy micrographs were taken from the fracture surfaces.

Investigation of the Debonding Process in Wood Fiber Reinforced Polymer Composites by Acoustic Emission

2007 ◽  
Vol 537-538 ◽  
pp. 199-206 ◽  
Author(s):  
Z. Kocsis ◽  
Tibor Czigány
Keyword(s):  
Tensile Strength ◽  
Acoustic Emission ◽  
Wood Fiber ◽  
Damage Mechanism ◽  
Tensile Tests ◽  
Fiber Reinforced ◽  
Polypropylene Composites ◽  
Fiber Reinforced Polymer Composites ◽  
Injection Molded ◽  
Ae Counts

Wood fiber reinforced polypropylene composites of different fiber contents without any treatment were prepared, and tensile tests were carried out on injection molded specimens. With increasing fiber content a decrease of the tensile strength was experienced. The weak adhesion at the fiber-matrix interface and the typical composite failures can be seen on SEM pictures. During the tests acoustic emission was monitored to get more information about the damage mechanism. From the AE counts distribution it can be concluded that the maximum number of AE counts decreases simultaneously with the tensile strength in case of the different composites.

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