Bibliographies thématiques / Part-set cuing / Articles de revues

Articles de revues sur le sujet « Part-set cuing »

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Auteur : Grafiati
Publié le 11 mars 2023

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1

Kelley, Matthew R., Yuri Parasiuk, Jennifer Salgado-Benz et Megan Crocco. « Spatial part-set cuing facilitation ». Memory 24, no 6 (7 août 2015) : 737–45. http://dx.doi.org/10.1080/09658211.2015.1046382.

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Del Missier, Fabio, et Chiara Terpini. « Part-set cuing in option generation ». Memory & ; Cognition 37, no 3 (avril 2009) : 265–76. http://dx.doi.org/10.3758/mc.37.3.265.

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Reysen, Matthew B., et James S. Nairne. « Part-set cuing of false memories ». Psychonomic Bulletin & ; Review 9, no 2 (juin 2002) : 389–93. http://dx.doi.org/10.3758/bf03196298.

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Cole, Sydni M., Matthew B. Reysen et Matthew R. Kelley. « Part-set cuing facilitation for spatial information. » Journal of Experimental Psychology : Learning, Memory, and Cognition 39, no 5 (2013) : 1615–20. http://dx.doi.org/10.1037/a0032424.

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Dagnall, Neil, Andrew Parker et Gary Munley. « Effects of Part-Set Cuing on Reminiscence ». Perceptual and Motor Skills 105, no 3 (décembre 2007) : 1015–22. http://dx.doi.org/10.2466/pms.105.3.1015-1022.

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DAGNALL, NEIL. « EFFECTS OF PART-SET CUING ON REMINISCENCE ». Perceptual and Motor Skills 105, no 7 (2007) : 1015. http://dx.doi.org/10.2466/pms.105.7.1015-1022.

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Peynircioglu, Zehra F., et Corbin Moro. « Part-Set Cuing in Incidental and Implicit Memory ». American Journal of Psychology 108, no 1 (1995) : 1. http://dx.doi.org/10.2307/1423098.

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Fritz, Catherine O., et Peter E. Morris. « Part-set cuing of texts, scenes, and matrices ». British Journal of Psychology 106, no 1 (5 décembre 2013) : 1–21. http://dx.doi.org/10.1111/bjop.12058.

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Dagnall, Neil, Andrew Parker et Gary Munley. « The Effects of Part-Set Cuing on the Recall of General Knowledge Information ». Journal of Cognitive Education and Psychology 7, no 2 (janvier 2008) : 248–65. http://dx.doi.org/10.1891/194589508787381809.

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Three experiments were conducted to investigate whether part-set cuing effects generalize to an educational style learning and assessment task. Mnemonic performance was assessed in terms of overall recall, item gain (reminiscence) and item loss (forgetting). In Study 1 we found that negative part-set cuing effects extended to the recall of general knowledge items. In Studies 2 and 3 we explored the boundaries of the observed partset cuing effect further, focusing on cue set size and cue set order. Greater inhibition was observed with 15 than 5 cue items (Study 2), and cue set order was found to affect item gain when cue set order was emphasized prior to or at retrieval (Study 3). The implications of these findings are discussed in the context of learning, recall and assessment.
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Basden, Barbara H., David R. Basden, Barbara A. Church et Pat Beaupre. « Setting boundary conditions on the part-set cuing effect ». Bulletin of the Psychonomic Society 29, no 2 (février 1991) : 213–16. http://dx.doi.org/10.3758/bf03335238.

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Basden, Barbara H., David R. Basden, Barbara A. Church et Pat Beaupre. « Setting boundary conditions on the part-set cuing effect ». Bulletin of the Psychonomic Society 29, no 3 (mars 1991) : 213–16. http://dx.doi.org/10.3758/bf03342681.

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Marsh, Elizabeth J., Patrick O. Dolan, David A. Balota et Henry L. Roediger. « Part-Set Cuing Effects in Younger and Older Adults. » Psychology and Aging 19, no 1 (2004) : 134–44. http://dx.doi.org/10.1037/0882-7974.19.1.134.

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Basden, Barbara H., David R. Basden et James P. Stephens. « Part-set cuing of order information in recall tests ». Journal of Memory and Language 47, no 4 (novembre 2002) : 517–29. http://dx.doi.org/10.1016/s0749-596x(02)00016-5.

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W. Foos, M. Cherie Clark, Paul. « OLD AGE, INHIBITION, AND THE PART-SET CUING EFFECT ». Educational Gerontology 26, no 2 (mars 2000) : 155–60. http://dx.doi.org/10.1080/036012700267303.

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Sloman, Steven A. « Part-set cuing inhibition in category-instance and reason generation ». Bulletin of the Psychonomic Society 29, no 2 (février 1991) : 136–38. http://dx.doi.org/10.3758/bf03335216.

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16

Boice, Monica L., et Gary J. Gargano. « Part-Set Cuing is Due to Strong, Not Weak, List Cues ». Psi Chi Journal of Psychological Research 6, no 3 (2001) : 118–22. http://dx.doi.org/10.24839/1089-4136.jn6.3.118.

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17

Rhodes, M. G., et A. D. Castel. « Metacognition and part-set cuing : Can interference be predicted at retrieval ? » Memory & ; Cognition 36, no 8 (1 décembre 2008) : 1429–38. http://dx.doi.org/10.3758/mc.36.8.1429.

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18

Peynircioğlu, Zehra F. « Part-set cuing effect with word-fragment cuing : Evidence against the strategy disruption and increased-list-length explanations. » Journal of Experimental Psychology : Learning, Memory, and Cognition 15, no 1 (1989) : 147–52. http://dx.doi.org/10.1037/0278-7393.15.1.147.

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Peynircioğlu, Zehra F. « On the generality of the part-set cuing effect : Evidence from nonmemory tasks. » Journal of Experimental Psychology : Learning, Memory, and Cognition 13, no 3 (1987) : 437–42. http://dx.doi.org/10.1037/0278-7393.13.3.437.

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Andrés, Pilar, et Charlotte E. Howard. « Part set cuing in older adults : Further evidence of intact forgetting in aging ». Aging, Neuropsychology, and Cognition 18, no 4 (juillet 2011) : 385–95. http://dx.doi.org/10.1080/13825585.2010.542892.

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Marx, Melvin H. « Facilitation of free recall of category names and instances by indirect part-set cuing ». Bulletin of the Psychonomic Society 26, no 3 (septembre 1988) : 195–96. http://dx.doi.org/10.3758/bf03337284.

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Serra, Matt, et James S. Nairne. « Part—set cuing of order information : Implications for associative theories of serial order memory ». Memory & ; Cognition 28, no 5 (septembre 2000) : 847–55. http://dx.doi.org/10.3758/bf03198420.

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Phillips, Joan M. « Using examples to increase recall in self-administered questionnaires ». International Journal of Market Research 63, no 6 (novembre 2021) : 738–53. http://dx.doi.org/10.1177/14707853211052177.

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Self-administered questionnaires often use examples or lists of examples to aid respondent recall. We report on the results of a field experiment examining how such examples in survey questions affect the episodic recall of events. Building on part-set cuing theory, the authors propose that examples increase recall when they cue low-accessibility subcategories of events, but may decrease recall when they cue high-accessibility subcategories. Further, cuing with examples rather than subcategory names may in some situations clarify questions and reduce non-useable open-ended responses. Findings from a survey of 2137 adult Medicaid recipients are generally consistent with these predictions.
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Peyn⌝rc⌝oǧlu, Zehra F., et Fatoş Gökşen-erelç⌝n. « Part-set cuing across languages : Evidence for both word- and concept-mediated inhibition depending on language dominance ». Acta Psychologica 67, no 1 (mars 1988) : 19–32. http://dx.doi.org/10.1016/0001-6918(88)90022-4.

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Drinkwater, Kenneth, Neil Dagnall et Andrew Parker. « Effects of Part-Set Cuing on Experienced and Novice Chess Players' Reconstruction of a Typical Chess Midgame Position ». Perceptual and Motor Skills 102, no 3 (juin 2006) : 645–53. http://dx.doi.org/10.2466/pms.102.3.645-653.

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Mikić, Marijana. « Environment and Emotion in The Revenant : A Cognitive Approach ». aspeers : emerging voices in american studies 10 (2017) : 77–92. http://dx.doi.org/10.54465/aspeers.10-07.

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This paper investigates the role of the environment in cuing spectator emotions in The Revenant. In order to analyze how the environment is portrayed to evoke emotional responses, this article utilizes a cognitive approach toward film. One important way in which this process works is through the protagonist’s experience of his surroundings. By following Hugh Glass on his journey through the wilderness, the viewer shares his experience of it and responds emotionally in a congruent way: with terror, fear, and compassion as well as with curiosity and genuine interest in nature. However, The Revenant additionally encourages a different set of emotions toward the wilderness that are not connected to Glass’s fate or desires. Spectators are invited to feel emotions toward the environment per se, both in The Revenant and in real life. Cutaways to fascinating shots of unspoiled wilderness invite contemplation about the human impact on natural life and the lack of willingness to change harmful behavior ever since the beginnings of environmental exploitation as depicted in The Revenant. The latter emotions can nevertheless not be regarded as independent from the narrative but rather as part of the cinematic experience, since they are evoked within the context of the film.
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Kroeger, Magdalen E., Nicole L. Hueng, Samuel D. Curry, Madison B. Copeland et Matthew R. Kelley. « On the composition of part-set cues ». Quarterly Journal of Experimental Psychology 72, no 10 (25 mars 2019) : 2365–70. http://dx.doi.org/10.1177/1747021819838829.

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Two experiments examined whether the specific composition of the set of cues might influence performance on a part-set cueing task. Although researchers traditionally have chosen their part-set cues either at random or systematically across the original set of materials, in the current study, the part-set cues comprised sets of either the most or least memorable items in the stimulus set (based on past research with the materials). With both word list (Experiment 1) and paragraph (Experiment 2) stimuli, the results showed differential effects of cue composition on part-set cueing performance. That is, part-set cueing impairment occurred following the presentation of high memorability cues, whereas there was no difference between cued and uncued performance following presentation of low memorability cues. These results suggest that the presence or absence of part-set cueing impairment can be influenced by the specific composition of the cue set.
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Muntean, William J., et Daniel R. Kimball. « Part-set cueing and the generation effect : An evaluation of a two-mechanism account of part-set cueing ». Journal of Cognitive Psychology 24, no 8 (décembre 2012) : 957–64. http://dx.doi.org/10.1080/20445911.2012.720967.

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Kelley, Matthew R., Carliann Pentz et Matthew B. Reysen. « The joint influence of collaboration and part-set cueing ». Quarterly Journal of Experimental Psychology 67, no 10 (octobre 2014) : 1977–85. http://dx.doi.org/10.1080/17470218.2014.881405.

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The present study was designed to examine the effects of retrieval cues on memory performance for both individuals and collaborating pairs. Participants worked either alone or together in the presence or absence of part-set cues to recall list items in Experiments 1 and 2 and to reconstruct the order of a list items in Experiment 3. The detrimental effects of collaborative inhibition were observed across all three experiments. In contrast, part-set cueing inhibition was found following free recall, whereas part-set cueing facilitation was observed on reconstruction tasks. Taken together, the results of the present experiments suggest that the effects of collaborative inhibition and part-set cueing may operate independently of one another.
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Kelley, Matthew R., et Sushmeena A. Parihar. « Part-set cueing impairment & ; facilitation in semantic memory ». Memory 26, no 7 (19 janvier 2018) : 1008–18. http://dx.doi.org/10.1080/09658211.2018.1428993.

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Muntean, William J., et Daniel R. Kimball. « Part-set cueing and lexical decisions : Testing an inhibitory account ». Journal of Cognitive Psychology 24, no 8 (décembre 2012) : 908–15. http://dx.doi.org/10.1080/20445911.2012.717922.

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Andrés, Pilar. « Equivalent part set cueing effects in younger and older adults ». European Journal of Cognitive Psychology 21, no 2-3 (mars 2009) : 176–91. http://dx.doi.org/10.1080/09541440802033980.

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Pei, Buck K. W., et Brad M. Tuttle. « Part-set cueing effects in a diagnostic setting with professional auditors ». Journal of Behavioral Decision Making 12, no 3 (septembre 1999) : 233–56. http://dx.doi.org/10.1002/(sici)1099-0771(199909)12:3<233 ::aid-bdm326>3.0.co;2-m.

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Radvansky, Gabriel A., et Andrea K. Tamplin. « Suppression in retrieval practice, part-set cueing, and negative priming memory : The hydrogen model ». Quarterly Journal of Experimental Psychology 66, no 7 (juillet 2013) : 1368–98. http://dx.doi.org/10.1080/17470218.2012.743572.

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Akpinar, Deniz, Vaughan Bamford, Sara Martinez Guzman, Tracey Nassuna, Madison Stevens et Matthew R. Kelley. « When Hints Hurt Memory : The Influence of the Number of Part-Set Cues on Free Recall ». Psi Chi Journal of Psychological Research 28, no 1 (2023) : 46–51. http://dx.doi.org/10.24839/2325-7342.jn28.1.46.

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The present study explored the effects of part-set cues on retention in a free recall task across 5 experiments. In the part-set cueing literature, researchers typically provide half of the to-be-remembered items as cues at test; accordingly, little is known about the effect of the number of part-cues on retention, particularly when very few or very many cues are presented at test. These experiments examined the effects of very few cues (2, 3, 4, 5, and 6 cues), half cues (15), and very many cues (25, 27, 28, and 29 cues) out of a list of 30 words. Put differently, the percentage of part-set cues in the very few condition ranged from 7–20% of the list, the half-cue condition was 50% of the list, and the very many cue condition ranged from 83–97% of the list. The very few cue conditions demonstrated null effects (all ps > .26), which suggests that there might be a minimum percentage of cues required before part-set cueing influences memory performance. In contrast, significant part-set cueing impairment occurred in all conditions where at least half of the cues were present (all ps < .03, except one marginally significant, p=. 06, when comparing the 0 vs. 27 cue conditions). Generally, these results are consistent with predictions derived from the retrieval strategy disruption hypothesis (Basden & Basden, 1995). Furthermore, the patterns of results reported in the half-cue and very many cue conditions were consistent with similar conditions in Slamecka (1968), but the results of these two studies differed when few cues were present.
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Barber, Sarah J., et Suparna Rajaram. « Collaborative memory and part-set cueing impairments : The role of executive depletion in modulating retrieval disruption ». Memory 19, no 4 (mai 2011) : 378–97. http://dx.doi.org/10.1080/09658211.2011.575787.

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Nakouzi, S., F. Berthet, D. Delaunay, Y. Le Maoult, Fabrice Schmidt et Vincent Sobotka. « Optimization of the Incident IR Heat Flux upon a 3D Geometry Composite Part (Carbon/Epoxy) ». Key Engineering Materials 504-506 (février 2012) : 1085–90. http://dx.doi.org/10.4028/www.scientific.net/kem.504-506.1085.

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The main purpose of this study is to cure a 3D geometry composite part (carbon fiber reinforced epoxy matrix) using an infrared oven. The work consists of two parts. In the first part, a FE thermal model was developed, for the prediction of the infrared incident heat flux on the top surface of the composite during the curing process. This model was validated using a reference solution based on ray tracing algorithms developed in Matlab®. Through the FE thermal model, an optimization study on the percentage power of each infrared heater is performed in order to optimize the incident IR heat flux uniformity on the composite. This optimization is performed using the Matlab® optimization algorithms based on Sequential Quadratic Programming and dynamically linked with the FE software COMSOL Multiphysics®. In a second part, the optimized parameters set is used in a model developed for the thermo-kinetic simulations of the composite IR curing process and the predictions of the degree of cure and temperature distribution in the composite part during the curing process.
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Cuong, Bui Cong. « Pythagorean Picture Fuzzy Sets, Part 1- basic notions ». Journal of Computer Science and Cybernetics 35, no 4 (31 octobre 2019) : 293–304. http://dx.doi.org/10.15625/1813-9663/35/4/13898.

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Picture fuzzy set (2013) is a generalization of the Zadeh‟ fuzzy set (1965) and the Antanassov‟intuitionistic fuzzy set. The new concept could be useful for many computational intelligentproblems. Basic operators of the picture fuzzy logic were studied by Cuong, Ngan [10,11 ].Newconcept –Pythagorean picture fuzzy set ( PPFS) is a combination of Picture fuzzy set with theYager‟s Pythagorean fuzzy set [12-14].First, in the Part 1 of this paper, we consider basic notionson PPFS as set operators of PPFS‟s , Pythagorean picture relation, Pythagorean picture fuzzy softset. Next, the Part 2 of the paper is devoted to main operators in fuzzy logic on PPFS: picturenegation operator, picture t-norm, picture t-conorm, picture implication operators on PPFS.As aresult we will have a new branch of the picture fuzzy set theory.
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Beyene, Shiferaw D., Beshah Ayalew et Srikanth Pilla. « On the Inter-Laminar Shear Strength of Composites Manufactured via a Stepped-Concurrent UV Curing and Layering Process ». Journal of Composite Materials 53, no 28-30 (12 juin 2019) : 4149–59. http://dx.doi.org/10.1177/0021998319846550.

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In this paper, we set to examine the inter-laminar shear strength of a fiber-reinforced composite part manufactured via a stepped-concurrent ultraviolet curing and layering process. This process was specifically proposed for making epoxy-based thick parts, whereby a layer-by-layer, model-based, optimal layering time and ultraviolet control scheme is set up with the objective of minimizing the degree of cure deviation across the final thick part. We focus on a cationic curing process wherein additional energy savings are possible by switching off the ultraviolet source after initiating the curing reaction with the ultraviolet source at each layer addition. Since the inter-laminar sheer strength of parts made via a layering process is often a concern, we consider the application of in-situ consolidation pressure in the layering process. We then characterize the inter-laminar shear strength by manufacturing samples with application of different in-situ consolidation pressures and measuring the inter-laminar shear strength of each sample by the short-beam shear test. The results showed that the inter-laminar shear strength of composite parts fabricated with the proposed stepped-concurrent curing, and layering process increases with the applied consolidation pressure up to a point. Scanning electron microscopy of samples cured at different in-situ consolidation pressure showed that the sample with optimum consolidation pressure has relatively uniform fiber to resin distribution and hence improved inter-laminar shear strength.
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Salagnac, P., P. Dutournie et P. Glouannec. « Simulations of heat transfers in an autoclave. Applications to the curing of composite material parts ». Journal de Physique IV 120 (décembre 2004) : 467–72. http://dx.doi.org/10.1051/jp4:2004120053.

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In this work, a small diameter autoclave for curing of composite material parts is studied. The particularity of this study arises from the heat exchanges, which are mainly free convection and radiation. The part is set in the matrix and it must respect a thermal cycle. It is necessary to take into account the different constraints connected to the use of the autoclave and the thermal behaviour of the matrix (limitation of tubular steel and matrix temperatures, temperature gradient in the curing part). This work is devoted to determinate the temperature profile in a section of the autoclave by numerical simulations realised by using the software package Fluent©. The taking different heat exchanges into account and the reticulation reaction heat contribution allow know the material temperature repartition during the curing. The aim is to propose solutions for minimising thermal gradients in the part and obtaining good mechanical specifications. In the simulations, we can observe a non-thermal homogeneity in the matrix and the autoclave because of the complexity of heat transfers and the particular geometry. These tests show the necessity to control the tubular steel temperature and in other part to make a good conception of the matrix configuration.
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Saeb, Mohammad R., et Mehdi Mostafaiyan. « The Effect of Thermal Boundary Condition on the Crosslink Density Distribution and the Curing Time of the Thick Cylindrical Dampers ». Rubber Chemistry and Technology 82, no 1 (1 mars 2009) : 37–50. http://dx.doi.org/10.5254/1.3557005.

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Abstract Optimization of curing process conditions of elastomers so as to achieve a part with homogeneous network is of crucial importance. One of the indicative parameters in the curing process is state of cure (SOC) that is investigated in this study in order to verify the influence of thermal boundary conditions on the curing of a cylindrical damper based on NR.. Furthermore, the newly introduced parameter of state of reversion (SOR) is defined, and this parameter will be set as a controlling parameter in the curing time; in order to avoid the unfavorable phenomenon of thermal decomposition. In this work, the curing process is numerically modeled using a finite element code which is developed by authors and results are compared with experimental results, as a verification step for validity of the code. Employing this code, the curing process is subjected to various molding temperatures, and it is demonstrated that a constant temperature of mold for elastomeric parts of high thickness will not result in a homogeneous crosslink network, unless the curing time is very long. Therefore, a varying with time temperature profile for mold is proposed that leads to a decreased curing cycle time, while giving complete SOC at a lower SOR value, simultaneously.
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Tomic, Radoljub, Aleksandar Sedmak, Dobrivoje Catic, Marko Milos et Zoran Stefanovic. « Thermal stress analysis of a hybride structure with cracks in the matrix (resin) composite material ». Thermal Science 15, no 2 (2011) : 559–63. http://dx.doi.org/10.2298/tsci1102559t.

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This paper presents numerical stress calculation in the stationary temperature domain for a hybride structure with fiber composite (for example, based on the epoxy risen as matrice of prepreg) and metalic part (other part of structure or metalic mould), as different material according to their own thermical behaviour. The thermal stress analysis is based on the finite element method. A sample problem involving such a composite plate and metalic part of structure or mould at two different temperature levels, corresponding to curing process (co-curing) and operating temperatures respectively, is calculated and discussed. The specifics of composite are emphasized particularly for thermal coefficients (especially shear coefficient is different than zero, there are situations when some of coefficients could be less then zero). This composites as generalized orthotropic material are completelly different than isotropic material (for isotropic material shear coefficient is always equal zero). It was pointed out also that the calculation for the initial crack to appear in the lamellae (the most common occurrence of cracks in the matrix) can be set with a reserve of elasticity or without reserve.
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Heinze, Søren, et Andreas Echtermeyer. « A Practical Approach for Data Gathering for Polymer Cure Simulations ». Applied Sciences 8, no 11 (12 novembre 2018) : 2227. http://dx.doi.org/10.3390/app8112227.

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Producing precision parts requires good control of the production parameters. When casting thermoset polymers an understanding of the curing process, with its heat release and associated temperature changes, is important. This paper describes how the cure of a polymer of unknown detailed chemical composition in a large part can be predicted and how the necessary material properties required for the predictions can be obtained. The approach given is a relatively simple method that a part manufacturer can perform. It will not characterize chemical reactions in detail, but it gives sufficient accuracy to describe the process. The procedures will be explained for an example of casting a large block of a filled two-component thermoset polyurethane. The prediction of the degree of cure, the associated heat and temperature increase during the curing of a polymer was successfully done using a standard finite element program with the input parameters reaction energy, the Arrhenius pre-factor and the kinetic function, which describes the chemical reaction. The three parameters could be obtained with standard Differential Scanning Calorimetry (DSC) equipment. The data were analyzed with the model-free isoconversional method combined with the compensation effect. The same set of parameters allowed the prediction of experimental cure behavior over two orders of magnitude of time and at a curing temperature range from room temperature up to 420 K.
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44

Chavan, Vithal Rao, K. R. Dinesh, K. Veeresh, Veerabhadrappa Algur et Manjunath Shettar. « Influence of post curing on GFRP hybrid composite ». MATEC Web of Conferences 144 (2018) : 02011. http://dx.doi.org/10.1051/matecconf/201814402011.

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Composite materials for the most part depicted as the mixes of two or more materials that outcome in the unmistakable properties than that of guard materials. Fibre strengthened plastics have been all around utilized for get-together flying machine and transport key parts as a delayed consequence of their specific mechanical and physical properties, for example, high particular quality and high particular robustness. Another pertinent application for fibre maintained polymeric composites (particularly glass fibre strengthened plastics) is in the electronic business, in which they are utilized for passing on printed wiring sheets. The utilization of polymer composite materials is winding up being powerfully essential. The present work delineates the change and mechanical portrayal of new polymer composites including glass fibre fortress, epoxy and maple cellulose fibre. The starting late made composites are delineated for their mechanical properties. The composite spreads were set up by utilizing hand layup framework. The experiments were conducted on and studied the effect of post curing on hybrid composites. The result reveals that the samples only with natural fibre have more promising results compared with synthetic fibre. The synthetic fibres get wrinkled due to post curing were as no such visuals in the natural fibres.
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45

Nakouzi, Sawsane, Florentin Berthet, Yannick Le Maoult et Fabrice Schmidt. « Simulations of an Infrared Composite Curing Process ». Key Engineering Materials 554-557 (juin 2013) : 1517–22. http://dx.doi.org/10.4028/www.scientific.net/kem.554-557.1517.

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Epoxy resins have several applications in the aerospace and automobile industry. Because of their good adhesive properties, superior mechanical, chemical and thermal properties, and resistance to fatigue and micro cracking, they produce high performance composites. In the technology presented here, the composite is cured in an IR oven which includes halogen lamps. The liquid resin infusion (LRI) process is used to manufacture the composite, whereby liquid resin is infused through a fiber reinforcement previously laid up in a one-sided mold. These epoxy resins release an exothermic heat flux during the curing process, which can possibly cause an excessive temperature in the thickness. Consequently, for the production of high performance composites, it is necessary to know the thermal behavior of the composite during curing. Therefore, IR interactions with the graphite/epoxy system were modeled as a surface radiation transport. In our work, we have studied IR interactions with the composite, which is placed in an IR oven. Using an IR spectrometer Bruker Vertex 70 (1-27 μm), we measured radiative properties and determined the fraction of IR rays absorbed by the composite. Since it is necessary to optimize the manufacturing time and costs and to determine the performance of these composites, the purpose of this study is to model the IR curing of a composite part (carbon fiber reinforced epoxy matrix) in the infrared oven. The work consists in two parts. In the first part, a FE thermal model based on radiosity method was developed, for the prediction of the infrared incident heat flux on the top surface of the composite during the curing process. This model was validated using a reference solution based on ray tracing algorithms developed in Matlab® (In-lab software called Rayheat based on ray tracing algorithms is used to compute the radiative heat flux that impacts the composite). Through the FE thermal model, an optimization study on the percentage power of each infrared heater is performed in order to optimize the incident IR heat flux uniformity on the composite. This optimization is performed using the Matlab® optimization algorithms based on Sequential Quadratic Programming method. In a second part, the optimized parameters set is used in a three-dimensional numerical model which is developed in the finite element commercial software Comsol Multiphysics ™, where the heat balance equation is coupled with the cure kinetic model of the resin. This numerical model allows calculation of the temperature distribution in the composite during curing, which is a key parameter that affects its mechanical properties. In this model, we can predict also the evolution of the degree of cure as function of time. Experimental measurements were used to validate simulations of the whole infrared composite curing process. Keywords: Curing composite, infrared oven, Radiation, Optimization, Epoxy resin, Carbon fibers.
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46

Rizzolo, Robert, Daniel Walczyk, Jaron Kuppers, Daniel Montoney et Richard Galloway. « Rapid consolidation and curing of advanced composites using electron beam irradiation ». Proceedings of the Institution of Mechanical Engineers, Part B : Journal of Engineering Manufacture 233, no 4 (28 avril 2018) : 1168–81. http://dx.doi.org/10.1177/0954405418769950.

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A low-cost, low-waste manufacturing method for advanced thermoset composite parts could improve market penetration of composites compared to other engineering materials such as aluminum or steel. Such a method could combine some of the new trends in composites manufacturing such as resin infusion (eliminates need for prepreg), out-of-autoclave consolidation, and snap curing. The feasibility of a hybrid process with these characteristics has been demonstrated by uniting liquid composite molding, resin curing by electron beam irradiation, and high pressure consolidation with specialized elastomeric tooling. To demonstrate feasibility, a mold set was designed to make flat, square four-ply woven carbon fiber parts by (1) vacuum-infusing dry preforms with an electron beam–curable epoxy resin in minutes, (2) applying 690 kPa of uniform pressure and consolidating in seconds using an elastomer-faced specialized elastomeric tooling tool and simple hydraulic press, and (3) curing in seconds using a 3 MeV electron beam source. To better understand how various process parameters affect part performance, parameters are varied in a simple design of experiments, and flexural strength and stiffness, thickness distribution, fiber and void volume fractions, surface roughness, and cross-sectional characteristics (via microscopy) are measured and compared.
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47

Li, Zhipeng, Lianzhen Zhang, Yuntian Chu et Qingsong Zhang. « Research on Influence of Water-Cement Ratio on Reinforcement Effect for Permeation Grouting in Sand Layer ». Advances in Materials Science and Engineering 2020 (9 mars 2020) : 1–12. http://dx.doi.org/10.1155/2020/5329627.

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In order to study permeation grouting reinforcement effect in the sand layer, a set of grouting test device is developed, which consists of a power device, a pressure-bearing slurry tank, and several test frames. Compressive strength, deformation modulus, and permeability coefficient are selected to be the evaluation index of grouting reinforcement effect. Grouting reinforcement effect under different water-cement ratio of cement slurry and curing time were measured. Eventually, under laboratory conditions, fitting formulas have been obtained which describe the quantitative relationship between reinforcement effect of permeation grouting and water-cement ratio and curing time. Results show that water-cement ratio of slurry has obvious effect on grouting reinforcement effect. Mechanical performance and impermeability of the grouted body are negative-correlated with water-cement ratio. There are two different destruction patterns for the grouted body in uniaxial compression process: global destruction pattern at low water-cement ratio and local destruction pattern at high water-cement ratio. If cement slurry at high water-cement ratio is permeated into the sand layer, water bleeding phenomena will appear and lead to inhomogeneous performance of the grouted body, with lower performance in the upper part and higher performance in the lower part of the grouted body.
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48

Smoleń, Jakub, Piotr Olesik, Paweł Gradoń, Mateusz Chudy, Bogusław Mendala et Mateusz Kozioł. « The Use of the ATD Technique to Measure the Gelation Time of Epoxy Resins ». Materials 14, no 20 (13 octobre 2021) : 6022. http://dx.doi.org/10.3390/ma14206022.

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In this paper, we investigated the thermodynamics of the resin curing process, when it was a part of composition with graphite powder and cut carbon fibers, to precisely determine the time and temperature of gelation. The material for the research is a set of commercial epoxy resins with a gelation time not exceeding 100 min. The curing process was characterized for the neat resins and for resins with 10% by weight of flake graphite and cut carbon fibers. The results recorded in the analysis of temperature derivative (ATD) method unequivocally showed that the largest first derivative registered during the test is the gel point of the resin. The innovative approach to measuring the gelation time of resins facilitates the measurements while ensuring the stability of the curing process compared to the normative tests that introduce mechanical interaction. In addition, it was found during the research that the introduction of 10% by weight of carbon particles in the form of graphite and cut carbon fibers rather shortens the gelation time and lowers the temperature peak due to the effective absorption and storage of heat from the cross-linking system. The inhibiting (or accelerating) action of fillers is probably dependent on chemical activity of the cross-linking system.
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49

Smoleń, Jakub, Piotr Olesik, Paweł Gradoń, Mateusz Chudy, Bogusław Mendala et Mateusz Kozioł. « The Use of the ATD Technique to Measure the Gelation Time of Epoxy Resins ». Materials 14, no 20 (13 octobre 2021) : 6022. http://dx.doi.org/10.3390/ma14206022.

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Résumé :
In this paper, we investigated the thermodynamics of the resin curing process, when it was a part of composition with graphite powder and cut carbon fibers, to precisely determine the time and temperature of gelation. The material for the research is a set of commercial epoxy resins with a gelation time not exceeding 100 min. The curing process was characterized for the neat resins and for resins with 10% by weight of flake graphite and cut carbon fibers. The results recorded in the analysis of temperature derivative (ATD) method unequivocally showed that the largest first derivative registered during the test is the gel point of the resin. The innovative approach to measuring the gelation time of resins facilitates the measurements while ensuring the stability of the curing process compared to the normative tests that introduce mechanical interaction. In addition, it was found during the research that the introduction of 10% by weight of carbon particles in the form of graphite and cut carbon fibers rather shortens the gelation time and lowers the temperature peak due to the effective absorption and storage of heat from the cross-linking system. The inhibiting (or accelerating) action of fillers is probably dependent on chemical activity of the cross-linking system.
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50

Kallweit, Jan, Robert Seewald, Mark Pätzel, Alexander Schiebahn, Uwe Reisgen et Thomas Gries. « Curing Adhesives with Woven Fabrics Made of Polymer Optical Fibre and PET Yarn ». Solid State Phenomena 333 (10 juin 2022) : 129–36. http://dx.doi.org/10.4028/p-a731y5.

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UV bonding technology’s biggest limitation is the need of a transparent joining part to be able to cure the adhesive with an external light source. This is to be solved with ribbon fabrics made with polymer optical fibres (POF) which guide the UV light into the adhesive bond. On the basis of previously published experiments, a set of POF fabrics with different thread densities and weft materials is evaluated optically regarding the emitted UV light intensity and mechanically regarding the shear strength of the adhesive bonds. A factorial experiment plan indicates that higher tensile lap-shear strength comes with lower weft fineness and higher weft density. The maximum shear strength achieved was 8.3 MPa with potential room for improvement due to non-cohesive failure, relatively high weft densities and a comparatively low powered UV light source.
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