Analysis of cracked metallic structure with imperfectly bonded composite patch

Naboulsi, Sam; Mall, S.

doi:10.2514/6.1997-1363

Cited by 5 publications

(3 citation statements)

References 15 publications

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“…It is noted that the bonding strength between different materials depends on both thermal expansion coefficients and surface forces. 33 O 2 plasma treatment increases the latter, overcoming residual thermal stress.…”

Section: Resultsmentioning

confidence: 99%

Thermoset polyester droplet-based microfluidic devices for high frequency generation

et al. 2011

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The vast majority of droplet-based microfluidic devices are made from polydimethylsiloxane (PDMS). Unfortunately PDMS is not suitable for high frequency droplet generation at high operating pressure due to its low shear modulus. In this paper, we report the fabrication and testing of microfluidic devices using thermoset polyester (TPE). The optical characteristics of the fabricated devices were assessed and substrate resistance to pressure also investigated. TPE devices bonded using an O(2) plasma treated PET substrate at 76 °C were shown to function efficiently at pressures up to 18 MPa. TPE material retains many of the attractive features of PDMS such as ease of fabrication but significantly, has superior mechanical properties. The improved resistance of TPE to high pressures enabled investigation of high frequency droplet generation as a function of a wide range of flow-rates with three different oils as continuous phase.

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Section: Resultsmentioning

confidence: 99%

Thermoset polyester droplet-based microfluidic devices for high frequency generation

et al. 2011

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“…Fretting fatigue has extensively been studied by . However, the number of numerical work in the context of fretting fatigue such those and Naboulsi and Mall [7] is few. In the present work, the effect of tudied using numerical codes such as ANSYS [8] and FRANC2D/L …”

Section: Crack Propagation Zonementioning

confidence: 99%

Numerical modelling of fretting fatigue

Talemi

Wahab

Baets

2011

J. Phys.: Conf. Ser.

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Abstract. Fretting fatigue is a consequence of small oscillatory movement between two contacting parts. This type of damage may give rise to significant reduction in fatigue life of the components. Many parameters such as contact geometry, contact load, friction, material strength and hardness can influence the resistance of materials against fretting damage. Experimental study of fretting fatigue parameters such as crack length measurement at the initial stages of crack growth is either very difficult or not very accurate. Numerical simulations provide a suitable tool for parametric study of fretting fatigue behavior of materials and in particular crack growth measurement. In this work, the effect of pad geometry on crack propagation is investigated by numerical simulation. The simulations are carried out using the finite element codes ANSYS and FRANC2D/L and are validated by the results of some fretting fatigue tests. It is shown that the simulations can predict the crack growth and the number of cycles from the principals of fracture mechanics.

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“…Current research on composite repairs relative to the fatigue properties comprises the following aspects: methodologies and basic concepts development [3,4], materials selection [4], surface treatment [6 -8], patch parameter design [9,10], thermal effects [11], mechanical property characterization [12,13] and durability assessment [14 -16].…”

Section: Introductionmentioning

confidence: 99%

Effects of patch layer and loading frequency on fatigue fracture behavior of aluminum plate repaired with a boron/epoxy composite patch

Salehi‐Khojin¹,

Zhamu

Zhong

et al. 2006

Journal of Adhesion Science and Technology

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In this study, 6.125 mm cracked Al 7075-T6 plates with different patch layers of boron/epoxy composite have been fatigue tested. By using analytical and experimental methods, the variation of critical parameters in fracture mechanics, such as stress intensity factor (SIF), potential energy (PE) and energy release rate (J * ), with patch layers were studied. According to the results of energy and driving force approaches, it was shown that both theories had good consistency using more ply numbers to repair cracked substrates. It was suggested that to investigate the effect of the patch layer on the air stream around the aircraft structure, in addition to fracture mechanics analysis, using a fluid dynamics simulation would be very helpful.

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Analysis of cracked metallic structure with imperfectly bonded composite patch

Cited by 5 publications

References 15 publications

Thermoset polyester droplet-based microfluidic devices for high frequency generation

Thermoset polyester droplet-based microfluidic devices for high frequency generation

Numerical modelling of fretting fatigue

Effects of patch layer and loading frequency on fatigue fracture behavior of aluminum plate repaired with a boron/epoxy composite patch

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