A study on single-lap notched woven kenaf reinforced polymer bolted joint under temperature action

Romayne, Anders Hans (2016) A study on single-lap notched woven kenaf reinforced polymer bolted joint under temperature action. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Study on natural fibers as reinforcing fibers in composite materials has started to gain interest as engineering materials due to renewability and excellent specific strength. Bolted joints requires introduction of hole that susceptible to stress concentration that leads to strength reduction, more complex when exposed to elevated temperature. Strength prediction tools are still lacking, limited success was found in semi-empirical and numerical approach. More recently, extended finite element method (XFEM) formulation has been reported in the literatures but there is no work has been carried out to incorporate the strength prediction exposed to elevated temperature. Present work predicted the notched strength and bearing stress at failures in open-hole and single-lap bolted joints woven fabric kenaf composite coupons respectively using XFEM by implementing traction-separation relationship. Strength prediction work of 2-D open hole and 3-D bolted joint models were then validated against experimental datasets tested under room and elevated temperatures as specified in the testing series. Research work concentrates on opening mode (Mode I) fracture associated with stress raisers ahead of notch tip. The experimental results showed increasing trend of notched strength and bearing stress under elevated temperature (120℃) due to matrix toughening. XFEM results were in good agreement with experimental datasets results where discrepancy less than 20% in notched coupon and within 8 – 35 % in bolted joint, better strength predictions were found in thicker and cross-ply coupons. It was found that XFEM techniques implemented able to predict the notched strength and bearing stress at failure by using thermal coefficient and specified temperature under elevated temperature with reasonable precision.

Item Type:Thesis (Masters)
Subjects:T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
ID Code:9093
Deposited By:Mr. Mohammad Shaifulrip Ithnin
Deposited On:09 May 2017 15:34
Last Modified:09 May 2017 15:34

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