Glass reinforced epoxy tubes subjected to indentation load: A study of scaling effects

Hafeez, Farrukh; Almaskari, Fahad

doi:10.1016/j.compstruct.2014.06.021

Cited by 4 publications

(5 citation statements)

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“…The damage size was calculated by post-processing the video and the images, using a reference length marked inside the tube next to the damaged area. Details of the damage area measurement are available in the literature (Hafeez and Almaskari, 2014;Hafeez and Almaskari, 2015). The scaled data for first indentation load collapse onto the same trend when plotted with respect to energy, displacement and time.…”

Section: Comparison Of Scaled Damage Growth Ratementioning

confidence: 70%

“…Four different types of scaled specimens were used according to the dimensions listed in Table I. The model and corresponding scaling factors established in Hafeez and Almaskari (2014) were used. The specimens were made of diglycidyl ether of bisphenol-A and direct roving type E-Glass with filament winding.…”

Section: Description Of Indentation Testsmentioning

confidence: 99%

“…The first phase is during initial indentation loading, where the elastic region scales quite well. The second phase begins as damage initiates and delamination occurs; where noticeable inconsistency in the scaling response is observed particularly as the scale size reduces due to more localised damage zone resulted from smaller size indenter (Hafeez and Almaskari, 2014). The third phase is during the unloading the scaling response is more compliant as compared to the second phase.…”

Section: Comparison Of Scaled Force and Energymentioning

confidence: 99%

“…However, the loss of fracture toughness was less at larger scales, perhaps due to the larger distance between the loading points. Evans et al (1992) argued that up to the first failure a simple relation (Equation ( 2)) can be employed to predict indentation displacement at the instance of first failure or the end of phase I (Hafeez and Almaskari, 2014). The authors may have considered that the elastic behaviour of the tubes in the first phase made it worthwhile to employ this analytical model.…”

Section: 4mentioning

confidence: 99%

“…Behaviour of geometrically scaled GRE tubes by the manufacturer, i.e. 20.5 GPa (Hafeez and Almaskari, 2014). Since the force displacement trace for second loading is similar, the same relation can be employed to estimate modulus; the calculated values are listed in the last column of Table III.…”

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Study on behaviour of geometrically scaled glass reinforced epoxy tubes subjected to non-coincident quasi static-indentation

Almaskari

Hafeez

2018

IJSI

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Purpose The purpose of this paper is to study the behaviour of glass reinforced epoxy tubes subjected to repeated indentation loads at two non-coincident indentations 180° apart. Design/methodology/approach Four geometrically scaled specimens ranging from 100 to 400 mm diameter were used in repeated indentation tests. Force, displacement and damage growth were recorded for loading and unloading until the indenter returned to its original starting point. Findings Similar scaled trends were observed between the non-coincidental loadings. Unlike reported response form coincidental loadings, the responses from non-coincidental loadings yield lower values for bending stiffness and peak load. Research limitations/implications The differences in behaviour of the specimen between non-coincident loadings were attributed to reductions in fracture toughness and circumferential modulus. Practical implications Distant non-interacting damage and delamination around the circumference does reduce the structural performance. Originality/value Behaviour of composite tubes under different loading conditions, for example low speed impact or quasi static indentation, is widely studied, however little attention has been given to the repeated loading incidents.

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Section: Comparison Of Scaled Damage Growth Ratementioning

confidence: 70%

Section: Description Of Indentation Testsmentioning

confidence: 99%

Section: Comparison Of Scaled Force and Energymentioning

confidence: 99%

Section: 4mentioning

confidence: 99%

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