Experimental–computational study towards heat generation in thick laminates under fatigue loading

Lahuerta, F.; Nijssen, R.P.L.; Meer, F.P. van der; Sluys, L.J.

doi:10.1016/j.ijfatigue.2015.05.014

Cited by 21 publications

(10 citation statements)

References 10 publications

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“…Based on the sub-laminates temperature measurements and equation ( 8), the curing rate was computed at the maximum heating rate during hardening. The c P , H r , K z and q were obtained from Lahuerta et al 4 for the tested material. The relation between curing rate and heating rate is shown in Figure 23.…”

Section: Measuring the Curing Rate With Three Thermocouplesmentioning

confidence: 99%

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The influence of curing cycle and through thickness variability of properties in thick laminates

Lahuerta

Nijssen

Meer

et al. 2016

Journal of Composite Materials

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Mechanical properties of glass fibre reinforced polymers are dependent on the manufacturing curing cycles. During the laminate manufacturing process, each thickness position experiences a different local curing cycle. Therefore, it can be expected that mechanical properties vary through the thickness, particularly for thick laminates. To study the through-thickness variation of static and fatigue mechanical properties, thick laminates were divided into sub-laminates and these sub-laminates were separately tested. The present work reports temperature profiles through the thickness recorded during the manufacturing of thick laminates, as well as experimental data from static and fatigue tests (S–N curves) of sub-laminates obtained at different thickness positions. The variation of the mechanical properties through the thickness is discussed and related to the local curing temperatures experienced by each sub-laminate.

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Section: Measuring the Curing Rate With Three Thermocouplesmentioning

confidence: 99%

“…A decrease in thick laminates mechanical properties has been reported for carbon fibre pre-pregs 1 as well as for glass fibre infused composites. 2 In addition to scaling effects 3 and self-heating 4 during fatigue, it is suspected that the manufacturing process influences the mechanical properties of thick laminates.…”

Section: Introductionmentioning

confidence: 99%

The influence of curing cycle and through thickness variability of properties in thick laminates

Lahuerta

Nijssen

Meer

et al. 2016

Journal of Composite Materials

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“…Lahuerta et al (2015) [ 21 ] studied the combined effect of sample thickness and frequency on the temperature increase of thick GFRP specimens loaded under cyclic compression loads. The thickness was varied between 10, 20, and 30 mm while the cyclic frequency was varied between 0.25 to 2.5 Hz.…”

Section: Introductionmentioning

confidence: 99%

“…However, one important question that needs to be answered is the following: Is it the same at all cyclic amplitudes? As stated by Lahuerta et al (2015) [ 21 ], the temperature that builds up in thick laminates due to volumetric heat generation can be influenced by fatigue frequency, loading ratio, the ratio of strain energy that is transformed into heat, and the boundary conditions of the material that undergoes fatigue loading.…”

Section: Introductionmentioning

confidence: 99%

Influence of Pulse–Pause Sequences on the Self-Heating Behavior in Continuous Carbon Fiber-Reinforced Composites under Ultrasonic Cyclic Three-Point Bending Loads

Premanand

Balle

2022

Materials

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Several studies have been conducted in the Very High Cycle Fatigue (VHCF) regime on Carbon Fiber Reinforced Polymers (CFRP) in search of their fatigue limit beyond their typical service life, which is itself in the order of 108 loading cycles. The ultrasonic fatigue test (UFT) method has been recently gaining attention for conducting fatigue experiments up to 109 loading cycles. This can be attributed to the reduction of testing time, as the testing facility operates at a cyclic frequency of 20 kHz. The fatigue loading in UFT is usually performed in a pulse–pause sequence to avoid specimen heating and undesirable thermal effects. For this study, the pulse–pause combination of the UFT methodology was explored and its influence on the self-heating behavior of the CFRP material was analyzed. This was realized by monitoring the temperature evolution in the CFRP specimens at different pulse–pause combinations and correlating it with their final damage morphologies. From the obtained results, it is concluded that the specimen heating phenomenon depends on several variables such as cyclic loading amplitude, the pulse–pause combination, and the damage state of the material. Finally, it is proposed that the test procedure, as well as the testing time, can be further optimized by designing the experiments based on the self-heating characteristic of the composite and the glass transition temperature (Tg) of the polymer matrix.

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“…При интенсивных циклических нагрузках и недостаточной теплоотдаче в окружающую среду эти элементы нагреваются до высоких температур. Повышение температуры приводит к снижению механических свойств ПКМ, ускорению накопления микроповреждений и преждевременному разрушению всей конструкции [4][5][6][7][8][9][10]. Такое явление объясняется тем, что полимерная матрица ведет себя как вязкоупругий материал, обладающий высоким внутренним трением и низким коэффициентом теплопередачи [8,9,11].…”

Section: Introductionunclassified

Прогнозирование Саморазогрева Стеклопластика При Циклическом Изгибе

Игнатова¹,

Безмельницын²,

Оливенко³

et al. 2022

mkm

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Эффект саморазогрева, обусловленный внутренним трением, — актуальная проблема при проектировании и эксплуатации циклически нагруженных элементов конструкций из стеклопластиков. Вибрация аэрокосмических конструкций с большими амплитудами и высокими частотами, а также ускоренные механические испытания могут привести к повышению температуры композита, деградации механических свойств и преждевременному разрушению. Цель исследования — изучение кинетики саморазогрева стеклопластика при знакопеременном изгибе. Для описания кинетики саморазогрева композита при нормальном конвективном теплообмене разработана малопараметрическая аналитическая модель. Для проверки результатов моделирования разработали оригинальный клиновидный образец и экспериментальную установку. Испытания на циклический изгиб провели при частотах от 10 до 20 Гц и амплитудах перемещений от 4 до 7 мм. Предложенная модель позволяет с приемлемой точностью предсказать зависимость максимальной температуры композита от времени, частоты и амплитуды.

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Experimental–computational study towards heat generation in thick laminates under fatigue loading

Cited by 21 publications

References 10 publications

The influence of curing cycle and through thickness variability of properties in thick laminates

The influence of curing cycle and through thickness variability of properties in thick laminates

Influence of Pulse–Pause Sequences on the Self-Heating Behavior in Continuous Carbon Fiber-Reinforced Composites under Ultrasonic Cyclic Three-Point Bending Loads

Прогнозирование Саморазогрева Стеклопластика При Циклическом Изгибе

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