Numerical Modelling of Low Velocity Impact in GFRP-Woven and GMT Composites
| dc.contributor.advisor | Ermias, G. Koricho (PhD) | |
| dc.contributor.advisor | Mulugeta, Habte (PhD) Co-Advisor | |
| dc.contributor.author | Yared, Getahun | |
| dc.date.accessioned | 2019-01-16T11:54:05Z | |
| dc.date.accessioned | 2023-11-18T06:29:06Z | |
| dc.date.available | 2019-01-16T11:54:05Z | |
| dc.date.available | 2023-11-18T06:29:06Z | |
| dc.date.issued | 2018 | |
| dc.description.abstract | Due to their draping, stiffness, improved ductility, and damage tolerance properties woven and mat composites are being increasingly used for the construction of crash-relevant structural parts like in the automotive industry. Composite materials are susceptible to low-velocity impact and the induced damage substantially reduces the residual mechanical performance and safe-service life. Due to this low-velocity impact, failure of structures, properties injuries and death are the main problem. Finding novel material and study the energy absorption capacity is the solution expect from material researchers. Finite element simulation of GMT and GFRP is based on ASTM – Designation D7136M-15. The constitutive models for intralaminar modes were incorporated into the ABAQUS/Explicit FE code by user-defined VUMAT material subroutines. The impact and stiffness behavior of Glass Mat Thermoplastic (GMT) and Glass fiber reinforced plastics (GFRP) are studied. GFRP has the different label of Cloisite® 20B nano clay, i.e., pristine, 0.5%, 1%, and 2% nano clay were investigated. The result shows the addition of nano-clay with 0.5% and 1% nano clay increase the stiffness while adding of nan clay with 2% decrease the stiffness of GFRP. Based on the stress concentration, damage in adding of nano-clay with 0.5 % shows poor tolerance as it has high-stress penetration. While adding nano-clay with 2% shows good resistance. Adding 1% nano clay has high stress concentration area and leads to high damage area. The energy absorption of 0.5% nano-clay is greater than 1% and 2% nano-clay while energy absorption of 2 % and 1% nano-clay is lower than the energy absorption capacity of pristine. From all observations of results, the best performance of material obtained in energy absorption is by loading Glass fiber reinforced polymer with 0.5% Cloisite® 20B nano-clay. The comparison of GMT and GFRP – woven composites, based on reaction force vs time graph the GMT composites fail firstly than GFRP woven composites of all clay label. Comparison of reaction force and displacement for Vumat and without Vumat done for pristine material. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/15778 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Cloisite® 20B | en_US |
| dc.subject | nano-clay | en_US |
| dc.subject | Glass fiber reinforced plastics (GFRP) | en_US |
| dc.subject | Glass mat thermoplastic (GMT) | en_US |
| dc.title | Numerical Modelling of Low Velocity Impact in GFRP-Woven and GMT Composites | en_US |
| dc.type | Thesis | en_US |