The Strength Distribution of 90° Plies in 0/90/0 Graphite-Epoxy Laminates

Peters, P.W.M.

doi:10.1177/002199838401800604

Cited by 87 publications

(23 citation statements)

References 7 publications

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“…This difference is generally attributed to the thickness effect of the laminate, adjacent ply constraints and thermal residual stresses [Flaggs and Kural 1982;Peters 1984;Chang and Lessard 1991]. Here empirical relations proposed by [Chang and Lessard 1991] are adopted for calculating in situ ply strengths as a function of the laminate thickness and stacking sequence.…”

Section: Mathematical Formulationmentioning

confidence: 99%

Analysis of impact response and damage in laminated composite shell involving large deformation and material degradation

Kumar

2008

JOMMS

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A nonlinear finite element analysis of impact response and impact-induced damage in curved composite laminates subjected to transverse impact by a foreign object is carried out. An eight-noded isoparametric quadrilateral shell element incorporating a nonlinear strain displacement relation due to large deflection is developed based on the total Lagrangian approach. The nonlinear system of equations is solved using a Newton-Raphson incremental-iterative method. Example problems of graphite/epoxy cylindrically curved laminates with different curvature are considered and the influence of geometrical nonlinearity on the impact response and the resulting damage is demonstrated. The concurrent effect of material degradation due to impact damage is also investigated.

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Section: Mathematical Formulationmentioning

confidence: 99%

Analysis of impact response and damage in laminated composite shell involving large deformation and material degradation

Kumar

2008

JOMMS

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“…This results in a certain crack spacing which is influenced, for example, by the strength distribution of the 90~ and the non-homogeneous stress distribution around cracks. Peters and coworker [7,12] considered that the 90~…”

Section: The P Methods [Z 12_7mentioning

confidence: 99%

“…16 calculated with the MCJR method [5] in comparison with the original input parameters of the simu- once. They chose somewhat arbitrarily the element length, lo, to be twice the length in which 90% of the undisturbed stress is introduced in the 90~ In case of the 02/906/02 laminate, the element length, lc, measures 0.83 mm [7].…”

Section: The P Methods [Z 12_7mentioning

confidence: 99%

“…Although multiple fracture of the 90~ cannot be predicted beforehand, it has been demonstrated by the analysis of experimental data that the apparent strength can be described by the two-parameter Weibull distribution function [5,7,12]. Manders et al [5] (the MCJR method) and Peters and co-worker [7,12] (the P method) proposed simple methods to deduce the shape and scale parameters of Weibull distributions which describe the strength of the transverse ply.…”

Section: Introductionmentioning

confidence: 99%

“…Manders et al [5] (the MCJR method) and Peters and co-worker [7,12] (the P method) proposed simple methods to deduce the shape and scale parameters of Weibull distributions which describe the strength of the transverse ply.…”

Section: Introductionmentioning

confidence: 99%

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Monte-Carlo simulation of multiple fracture in the transverse ply of cross-ply graphite-epoxy laminates

Ochiai¹,

Peters²,

Schulte³

et al. 1991

J Mater Sci

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Graphite-epoxy cross-ply laminates generally show multiple fracture of the transverse ply at higher applied stress. This phenomenon is described by means of a Monte Carlo simulation method based on the assumption that the strength of the transverse ply obeys a twoparameter Weibull distribution function. The main results show that the smaller the scatter of strength of the 90~ (i.e. the larger the shape parameter at a constant mean strength of the Weibull distribution), the higher becomes the threshold for the multiple fracture to occur, and the more rapidly the length of 90~ segments decreases with increasing applied stress once multiple fracture takes place. The methods to determine the shape and scale parameters of the Weibull distribution for the strength of the 90~proposed by Manders et al. and Peters are proved to be useful even for a small number of test specimens. When the interfacial bond strength between 0 ~ and 90~ is low, saturation of 90~ cracking occurs at higher applied stress. The stress-carrying capacity and stiffness of the composites as a whole are reduced by multiple fracture of the 90~ This reduction is more pronounced at increasing applied stress or at a larger number of transverse cracks, especially when the interfacial bond strength is low.

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Querrißbildung in 0/90/0 CFK‐Laminaten

Peters

1987

Materialwissenschaft Werkst

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toughened composite laminates using NASA standard damage tolerance tests, ACEE Composite Structures Technology Conference, Seattle, Washington 13.-15. August 1984. 2. Ch. Baron, K. Mull, K . Schulte, Kontinuierliche Ermittlung der Steifigkeit von Faserverbundwerkstoffen zur Charakterisierung des Ermiidungsverhaltens mit Hilfe eines ProzeSrechners. Vortragsband: ,, Werkstoffpriifung 1985", Bad Nauheim, VDEh Diisseldorf 3. P. W. M. Peters, The influence of fibre, matrix and interface on cross-ply cracking in carbon fibre-reinforced plastics, ASTM 2. Symposium on Composite Materials: Fatigue and Fracture, Cincinnati, Ohio, 27. u. Herrn Prof. Dr. rer. nat. Wolfgang Bunk zum 60. Geburtstag gewidmet QuerriBbildung in kohlefaserverstarkten Kunststoffen (CFK) mit sowohl duromerer als auch thermoplastischer Matrix wurde untersucht an 0/90/0 Laminaten mit unterschiedlicher 90"-Schichtdicke. Da die 9W-Schicht in einem Mehrschichtverbund zuerst versagt, kann die hohere Festigkeit der anderen Schichten nicht ausgenutzt werden. Aus diesem Grunde muR nach Moglichkeiten gesucht werden, die Querzugfestigkeit (Festigkeit senkrecht zur Faser) von Faserverbundwerkstoffen zu erhohen. Zunachst ist es deshalb notwendig, den Ein-fluR der Parameter, die die Querzugfestigkeit beeinflussen, zu untersuchen. In dieser Arbeit ist der EinfluR der Matrix(-Bruchdehnung), der Faser/Matrix-Grenzschicht, der Lunker und der Stiitzwirkung von Nachbarschichten ermittelt worden. Mit Hilfe von zweiparametrigen Weibull-Verteilungen der 9O0-Schicht-Bruchdehnung, die das Phanomen der mehrfachen Risbildung in einer Probe beschreiben, wurde festgestellt, da8 die Stiitzwirkung der Nachbarschichten, verbesserte FaserA4atrix-Haftung und Matrixduktilitat die Bruchdehnung erhohen und Lunker die Bruchdehnung verkleinern. Cross-ply Cracking in 0/90/0 CFRP LaminatesCross-ply cracking in carbon fibre reinforced plastics (CFRP) with thermoset as well as thermoplastic matrix systems was investigated on 0/90/0 laminates with varying 90"-ply thickness. Since in an angle ply laminate the 90"-ply fails first, the higher strength of the other plies cannot be taken advantage of. For this reason efforts have to be done to increase the transverse strength (strain) of fibre reinforced plastics. In the first place thus it is necessary to investigate the influence of the different parameters which contribute to the transverse strength. In this work the influence of matrix (fracture strain), fibrelmatrix interface, voids and constraining effect of neighbouring plies is investigated. With the aid of two-parameter Weibull distributions of the 90"ply fracture strain, which describe the phenomenon of multiple cracking in a specimen, it was found that the constraining effect due to neighbouring plies, improved fibre/matrix interface and matrix ductility increase, whereas voids decrease the transverse fracture strain. 1 Einfuhrung Die Festigkeit oder Bruchdehnung eines Faserverbundwerkstoffes quer zur Faser (Querzugfestigkeit, Querbruchdehnung) ist von vielen Parametern abhangig. In fru...

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The Strength Distribution of 90° Plies in 0/90/0 Graphite-Epoxy Laminates

Cited by 87 publications

References 7 publications

Analysis of impact response and damage in laminated composite shell involving large deformation and material degradation

Analysis of impact response and damage in laminated composite shell involving large deformation and material degradation

Monte-Carlo simulation of multiple fracture in the transverse ply of cross-ply graphite-epoxy laminates

Querrißbildung in 0/90/0 CFK‐Laminaten

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