Identification of failure mechanisms in fiber reinforced composites by acoustic emission analysis

2014 ◽  
pp. 347-354
Author(s):  
M Sause
Keyword(s):  
Acoustic Emission ◽  
Failure Mechanisms ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Emission Analysis ◽  
Acoustic Emission Analysis

scholarly journals Determination of Fatigue Damage Initiation in Short Fiber-Reinforced Thermoplastic through Acoustic Emission Analysis

2021 ◽  
Vol 5 (8) ◽  
pp. 221
Author(s):  
Janna Krummenacker ◽  
Joachim Hausmann
Keyword(s):  
Acoustic Emission ◽  
Fatigue Loading ◽  
Fiber Reinforced ◽  
Emission Analysis ◽  
Damage Initiation ◽  
Glass Fiber Reinforced ◽  
Stress Threshold ◽  
Strength Tests ◽  
Polyamide 6.6 ◽  
Acoustic Emission Analysis

This study investigates the damage initiation in short glass fiber-reinforced polyamide 6.6 under fatigue loading using acoustic emission analysis. An optimized specimen geometry was developed to meet the specific requirements of this testing method, at the same time allowing further micromechanical studies. Specimens were preloaded with tensile–tensile fatigue loading, varying the maximum stress and the number of load cycles. Subsequently, the acoustic emission signals in residual strength tests were compared to those of undamaged specimens. The idea behind this approach is that only the damage that has not already occurred under fatigue load can be recorded in the residual strength tests. Using the analysis of acoustic energy, a stress threshold for damage initiation was identified. Furthermore, with tension–tension fatigue tests, the SN curve of the material was determined to estimate the lifetime for the identified stress threshold. The presented approach allows us to estimate a so-called endurance limit of short glass fiber-reinforced polyamide 6.6.

Effect of Velocity on the Impact Resistance of Woven Jute Fiber Reinforced Composites

2013 ◽  
Vol 465-466 ◽  
pp. 1277-1281 ◽  
Author(s):  
Al Emran Ismail ◽  
Muhd Hafeez Zainulabidin ◽  
Mohd Nazrul Roslan ◽  
Abdul Latif Mohd Tobi ◽  
Nik Hisyamudin Muhd Nor
Keyword(s):  
Failure Mechanisms ◽  
Impact Resistance ◽  
Fiber Reinforced Composites ◽  
Jute Fiber ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Wide Range ◽  
Force Time ◽  
Type Of Failure ◽  
The Impact

is present project investigated the impact penetration response of woven jute fiber reinforced composites subjected to wide range of low impact velocities. Hand layout woven jute fibers are thermally compressed to ensure no internal defects formed in the composites. Six layers of woven jutes are stacked together using different fiber orientations [0/q/0]s. Low impact velocities are used ranging between 5 – 20 m/s. Force-time, force-displacement and energy-time curves are obtained automatically during the impact tests. The results are then discussed with considering the composite fragmentations and failure mechanisms. It is found that 00composite orientations capable to absorb sufficiently impact energy for 5 m/s but not for velocity greater than 10 m/s. When fiber orientations used between 15 – 450, the composite impact resistance increased indicating two significant peak forces. These peak forces represent different type of failure mechanisms occurred during the striker progresses.

Sign in / Sign up

Export Citation Format

Share Document