The effect of double impact on hygrothermally aged carbon epoxy laminates
This paper studies the effects of a repetitive occurence of impact in the same zone or point. Such occurence is unavoidable as such accidents happen and does not occur directly after the first incident but over a period of time. In order to study the effect, three stratifications of carbon epoxy f...
| Main Authors: | , , , , |
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| Format: | Conference or Workshop Item |
| Language: | English |
| Published: |
2012
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/26652/ http://irep.iium.edu.my/26652/1/Duracosys_2012_Hanan_Binte_Mokhtar_Full_Manuscript_%281%29.pdf |
| Summary: | This paper studies the effects of a repetitive occurence of impact in the same zone or point. Such occurence is
unavoidable as such accidents happen and does not occur directly after the first incident but over a period of
time. In order to study the effect, three stratifications of carbon epoxy fibre composite are fabricated and aged
under the condition of 70°C at a relative humidity of 85% in a climatic chamber up to 2100h. The three
stratifications include the classical sequence of layups used in the industry and two sequences with quasiisotropic
/quasi-homogeneous properties. The difference between the two quasi-isotropic/quasi-homogeneous
stratification is that one include fibre orientations of ±45° other than 0° and 90°, whereas the other includes
fibre orientaions of ±60°. The moisture uptake is noted by taking the weight at regular intervals, using a high
precision weight balance, up to saturation state. The first impact test is carried out with the impact energy of
20J and the damage due to impact is assessed using ultrasonic C-scan. The second impact test is carried out
under the same conditions after the impacted specimen undergoes a second ageing phase under the same
condition with the accumulated ageing period of 2300h. The damage to impact is then assessed again via
ultrasonic C-scan to observe the effect of double impact on the carbon epoxy composite. The effects of damage is
compared to see the changes in total damage area due to the first and second impact. |
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