The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Yu Paramonov - One of the best experts on this subject based on the ideXlab platform.
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extended weakest link distribution family and analysis of Fiber Strength dependence on length
Composites Part A-applied Science and Manufacturing, 2008Co-Authors: Yu ParamonovAbstract:Abstract An extension of the weakest link distribution family (WLDF) developed in Paramonov and Andersons [Paramonov Yu, Andersons J. A new model family for the Strength distribution of Fibers in relation to their length. Mech Compos Mater 2006;42(2):179–92; Paramonov Yu, Andersons J. A family of weakest link models for Fibers Strength distribution. Composite A 2007;38:1227–1233] and its application to the carbon Fiber material Strength data processing are presented in this paper. As in Paramonov and Andersons (2006, 2007) we consider the specimen as a chain of n elements (links). The fracture process is modeled as follows: in the first stage an initiation of defects (before loading or during loading) and in the second stage a specimen fracture take place. As it is distinct from our previous publications, the Strength of items without defects is taken into account; two types of defects (independent on load (“technological”) and dependent on load) and two types of the influence of defect number on the specimen Strength are considered. It is shown that for carbon Fiber material some models from WLDF and linear law (LW) traditional Weibull model provide some better prediction of Strength–length dependence than power law Weibull model which sometimes provides better fitting of experimental data.
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a family of weakest link models for Fiber Strength distribution
Composites Part A-applied Science and Manufacturing, 2007Co-Authors: Yu Paramonov, Jānis AndersonsAbstract:It is well known that the most widely used distribution function for Fiber tensile Strength, the two-parameter Weibull distribution, does not always adequately describe the experimentally observed Fiber Strength scatter and the Strength dependence on Fiber length. To remedy this discrepancy, modifications of the Weibull distribution have been proposed that, while providing a good empirical fit to the Strength data, sometimes lack the theoretical appeal of the weakest link models. We derive a family of weakest link models based on the assumption of a two-stage failure process incorporating explicitly the probabilities of flaw initiation and the Fiber fracture due to the largest flaw (i.e. the weakest link). The model is verified against a sample of E-glass Fiber Strength data at different gauge lengths and shown to provide a reasonably good fit to the test results.
William A. Curtin - One of the best experts on this subject based on the ideXlab platform.
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a 3d shear lag model considering micro damage and statistical Strength prediction of unidirectional Fiber reinforced composites
Composites Science and Technology, 2001Co-Authors: Tomonaga Okabe, Y Kamoshida, Masao Shimizu, Nobuo Takeda, William A. CurtinAbstract:Abstract A new numerical model is proposed for simulating the mechanical behavior of unidirectional composites which is based on a three-dimensional (3D) shear-lag model. The 3D shear-lag model considers the micro-damage phenomena of interfacial debonding and interfacial yielding. In order to confirm the validity of the model, the calculated stress concentration is compared with the HVD model (Hedgepeth JM, Dyke P. Local stress concentrations in imperfect filamentary composite materials. J Comp Mater 1967;1:294–309) in the appropriate limit. Monte Carlo simulations with the present shear-lag model were then conducted to obtain the ultimate tensile Strength (UTS) as a function of Fiber Strength and interfacial properties. The damage progression and formation of clusters versus the type of interfacial damage, and the size-scaling of the tensile Strengths, are carefully examined. Coupled with a size-scaling analysis, model predictions for tensile Strength show good agreement with experiment.
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modeling brittle and tough stress strain behavior in unidirectional ceramic matrix composites
Acta Materialia, 1998Co-Authors: William A. Curtin, B K Ahn, Nobuo TakedaAbstract:A new simple model for predicting the uniaxial stress-strain behavior of a unidirectional ceramic matrix composite. including stochastic matrix crack evolution, stochastic Fiber damage and ultimate failure, is presented. The model demonstrates an important transition in composite behavior. "Brittle" (low failure strain) behavior occurs when the matrix cracking stresses are sufficiently high; the composite fails during the matrix cracking regime of deformation and at a strain that is controlled by the matrix flaw population and elastic properties. "Tough" (high Failure strain) behavior occurs when the matrix cracking stresses are lower; matrix cracking is completed prior to failure and the failure strain of the composite is controlled by the Fibers. In both cases, the failure Strength is Fiber-controlled. The model is applied to study SiC/SiC 500-Fiber minicomposite deformation, using data recently obtained by Lissart and Lamon on two material types, "B" and "C". Parameters for the matrix flaw population are used to fit the experimental stress-strain data bur the failure is controlled by the measured Fiber Strength statistics. Excellent agreement is found for the "C" materials, which are in the transition regime between the brittle and tough limits and variations in Fiber Strength are postulated to be responsible for the wide range of behaviors found in the "B" materials. The fitted matrix flaw parameters are then used to predict the Fiber/matrix interfacial sliding resistance and the values obtained are in excellent agreement with independent values determined from both unload/reload hysteresis loops and Fiber pullout lengths. The new model provides a useful tool for understanding the interplay matrix and Fiber flaw distributions and the overall dependence of stress-strain behavior on ail the underlying constituent material properties. (C) 1998 Acta Metallurgica Inc.
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Fiber pull out and strain localization in ceramic matrix composites
Journal of The Mechanics and Physics of Solids, 1993Co-Authors: William A. CurtinAbstract:THE MECHANICAL properties of ceramic matrices uniaxially reinforced with strong continuous Fibers depend on a wide variety of material parameters: the Fiber and matrix elastic moduli, the matrix toughness, the statistical Fiber Strength, the Fiber radius and fill fraction, and the sliding resistance tau between the Fibers and the matrix. A major contribution to the work of fracture is the work to pull-out broken Fibers from the matrix against the sliding resistance. Recent analytic theories of the pull-out predict finite pull-out for very narrow Fiber Strength distributions, in contrast to prior theories and ideas suggesting zero pull-out. The theories also assume that Fiber cracking is distributed throughout the composite and not localized to some narrow region; such strain localization could modify composite properties tremendously. Here, both analytical arguments and numerical simulations are used to show that finite pull-out does exist for narrow Fiber Strength distributions. The numerical simulations also demonstrate that strain localization does occur, but that it (i) does not affect the ultimate tensile Strength, and (ii) reduces pull-out only slightly but with the detailed trends in pull-out properties predicted by the analytic theory retained. Some basic tenets and results of the analytic models are thus robust and so the analytic models should serve as powerful tools for composite optimization.
Isabel K. Lloyd - One of the best experts on this subject based on the ideXlab platform.
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effects of Fiber volume fraction on mechanical properties of sic Fiber si3n4 matrix composites
Journal of the American Ceramic Society, 1994Co-Authors: Claudia P. Ostertag, Linda M. Braun, Isabel K. LloydAbstract:The effects of Fiber volume fraction on composite mechanical properties were examined in SiC-Fiber-reinforced Si[sub 3]N[sub 4] composites. Fiber volume fraction was found to have significant effects on important composite properties including failure mode, ultimate Strength, matrix-cracking stress, Fiber-matrix interfacial shear stress, and work-of-fracture. The composite mechanical properties were improved with increasing Fiber volume fraction. However, when the Fiber volume fraction was sufficiently large, the composite ultimate Strength was degraded. This was related to Fiber Strength loss as a result of Fiber damage from contact with surrounding Fibers and abrasive matrix particles during hot pressing.
Jānis Andersons - One of the best experts on this subject based on the ideXlab platform.
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a family of weakest link models for Fiber Strength distribution
Composites Part A-applied Science and Manufacturing, 2007Co-Authors: Yu Paramonov, Jānis AndersonsAbstract:It is well known that the most widely used distribution function for Fiber tensile Strength, the two-parameter Weibull distribution, does not always adequately describe the experimentally observed Fiber Strength scatter and the Strength dependence on Fiber length. To remedy this discrepancy, modifications of the Weibull distribution have been proposed that, while providing a good empirical fit to the Strength data, sometimes lack the theoretical appeal of the weakest link models. We derive a family of weakest link models based on the assumption of a two-stage failure process incorporating explicitly the probabilities of flaw initiation and the Fiber fracture due to the largest flaw (i.e. the weakest link). The model is verified against a sample of E-glass Fiber Strength data at different gauge lengths and shown to provide a reasonably good fit to the test results.
Tingting Chen - One of the best experts on this subject based on the ideXlab platform.
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genetic and phenotypic effects of chromosome segments introgressed from gossypium barbadense into gossypium hirsutum
PLOS ONE, 2017Co-Authors: Weiwu Song, Zhen Zhang, Juan Cai, Juwu Gong, Haihong Shang, Aiying Liu, Mi Wang, Xianghui Xiao, Wankui Gong, Tingting ChenAbstract:MBI9915 is an introgression cotton line with excellent Fiber quality. It was obtained by advanced backcrossing and continuous inbreeding from an interspecific cross between the upland cotton (Gossypium hirsutum) cultivar CCRI36 as the recurrent parent and the sea island cotton (G. barbadense) cultivar Hai1, as the donor parent. To study the genetic effects of the introgressed chromosome segments in G. hirsutum, an F2 secondary segregating population of 1537 individuals was created by crossing MBI9915 and CCRI36, and an F2:3 population was created by randomly selecting 347 individuals from the F2 generation. Quantitative trait locus (QTL) mapping and interaction for Fiber length and Strength were identified using IciMapping software. The genotype analysis showed that the recovery rate for MBI9915 was 97.9%, with a total 6 heterozygous segments and 13 homozygous segments. A total of 18 QTLs for Fiber quality and 6 QTLs for yield related traits were detected using the two segregating generations. These QTLs were distributed across 7 chromosomes and collectively explained 0.81%-9.51% of the observed phenotypic variations. Six QTLs were consistently detected in two generations and 6 QTLs were identified in previous studies. A total of 13 pairs of interaction for Fiber length and 13 pairs of interaction for Fiber Strength were identified in two generations. Among them, 3 pairs of interaction for Fiber length and 3 pairs of interaction for Fiber Strength could be identified in all generations; 4 pairs of interactions affected Fiber length and Fiber Strength simultaneously. The results clearly showed that 5 chromosome segments (Seg-5-1, Seg-7-1, Seg-8-1, Seg-20-2 and Seg-20-3) have important effects on Fiber yield and quality. This study provides the useful information for gene cloning and marker-assisted breeding for excellent Fiber related quality.
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high resolution consensus mapping of quantitative trait loci for Fiber Strength length and micronaire on chromosome 25 of the upland cotton gossypium hirsutum l
PLOS ONE, 2015Co-Authors: Zhen Zhang, Jamshed Muhammad, Juan Cai, Fei Jia, Yuzhen Shi, Juwu Gong, Haihong Shang, Aiying Liu, Tingting Chen, Koffi Kibalou PalangaAbstract:Cotton (Gossypium hirsutum L.) is an important agricultural crop that provides renewable natural Fiber resources for the global textile industry. Technological developments in the textile industry and improvements in human living standards have increased the requirement for supplies and better quality cotton. Upland cotton 0–153 is an elite cultivar harboring strong Fiber Strength genes. To conduct quantitative trait locus (QTL) mapping for Fiber quality in 0–153, we developed a population of 196 recombinant inbred lines (RILs) from a cross between 0–153 and sGK9708. The Fiber quality traits in 11 environments were measured and a genetic linkage map of chromosome 25 comprising 210 loci was constructed using this RIL population, mainly using simple sequence repeat markers and single nucleotide polymorphism markers. QTLs were identified across diverse environments using the composite interval mapping method. A total of 37 QTLs for Fiber quality traits were identified on chromosome 25, of which 17 were stably expressed in at least in two environments. A stable Fiber Strength QTL, qFS-chr25-4, which was detected in seven environments and was located in the marker interval between CRI-SNP120491 and BNL2572, could explain 6.53%–11.83% of the observed phenotypic variations. Meta-analysis also confirmed the above QTLs with previous reports. Application of these QTLs could contribute to improving Fiber quality and provide information for marker-assisted selection.