Before following any teaching technique, it is very important to Learn the Learner and then to implement the teaching technique based on the learner's capability. Hence, I propose Learner-centered Teaching methodology [LCTM] or Student-Centric Teaching Technique [SCTT].
Fiber reinforced polymer composites have a complex damage prediction and repair mechanism. Such complexities made the researchers to implement new techniques like self healing. Amendments in the existing material can modify its properties. So, it is necessary to study the change in property due to inclusion of self healing in fiber reinforced composite materials. This work aims to investigate the self recovery response of composites prepared by reinforcing glass fibers and carbon fibers in epoxy matrix. The healing was achieved by inclusion of dual microcapsules made of epoxy and hardener encased in separate capsules. To investigate the recovery activity of the composite laminate, a 5mm diameter indentation was produced at the centre of specimen and the healing was monitored by measuring the diameter of indentation after 12 hrs and 24 hrs. To notice the influence of micro-inclusions on flexural strength, flexural test was conducted on neat, indented and healed specimens. It was observed that inclusion of microcapsules did not majorly alter flexural strength of glass fiber reinforced and carbon fiber reinforced polymer composites. Results also indicated complete healing of both carbon fiber reinforced polymer and glass fiber reinforced polymer composite specimens with healing efficiency of 103.4% and 101.8% respectively.
The intent of this project is to determine the tensile strength of CFRP lap joint with and without introduction of multiwall carbon nano tubes (MWCNT). Specimens with lap joint were prepared by Adhesive bonding. The dimensions of the specimens were kept according to the ASTM standard D-5868. An experimental work along with FEA analysis was undertaken to identify the ultimate tensile strength and modes of failure in two different categories of adhesively bonded specimen, firstly with inclusion of different percentages of MWCNT and secondly without inclusion of MWCNT. MWCNT of 0.1% and 0.3% by weight was added to the adhesive used in creating the joint. The adhesively bonded specimens with inclusion of MWCNT showed better load bearing capacity, the highest being 86% for 0.3% MWCNT. An increment of 27% was observed in the tensile strength with the increase in percentage of MWCNT. Further the FEA analysis was carried out which proved the experimental results are well within the error range of 1%.
To create a better and stronger single lap joint that has the potential of sustaining the damage load to a greater extent, nano particles like multiwall carbon nanotube (MWCNT) and Fullerene C60 were dispersed in the adhesive. Though the joints made by adhesive bonding are stronger in themselves but the use of nano particle can further increase the damage load carrying capacity. The current research focuses on developing adhesively bonded single lap joints (ABSLJ’s) by dispersing MWCNT and Fullerene C60 in the adhesive at a weight percentage of 1% and 3% by ultrasonication. Carbon fiber fabric was used as adherend and a two part epoxy system was used as an adhesive. By using the metallic shims, the thickness of adhesive was retained at 0.5 mm and 1 mm. Results reveals that the joints made with the use of MWCNT showed better load bearing capacity compared to that of the joints made with Fullerene C60. It was even revealed that with the rise in the thickness of the adhesive, the joint strength decreased. An increase of 154% in the joint strength was obtained for joint sample with 3 wt % MWCNT and 0.5 mm adhesive thickness compared to non doped joints. As the adhesive thickness was raised to 1 mm, for the same weight percentage the joint strength dipped by 16%. While for Fullerene C60, increase in the joint strength was seen at 1 wt % with 0.5 mm adhesive thickness followed by a 15% dip in strength at 1 mm adhesive thickness.
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