The effect of specimen size on the strength of cfrp

Hitchon, J.W.; Phillips, D. C.

doi:10.1016/0010-4361(78)90590-6

Cited by 64 publications

(19 citation statements)

References 2 publications

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“…Bullock [42] reported a study on graphite-epoxy where Weibull analysis proved a good correlation with the measured strength of single strand tows and tensile coupons. Hitchon and Philips [43] used carbon-epoxy materials to compare the strength of specimens with different volumes through tensile, flexural and hoop-burst tests. Although a Weibull model could explain reasonably well the hoop and tensile strength results, flexural strengths were lower than predicted and could not be explained by the statistical model.…”

Section: Size Effects On Strength In Frp Materialsmentioning

confidence: 99%

Probabilistic strength prediction for double lap joints composed of pultruded GFRP profiles – Part II: Strength prediction

Vallée

Correia

Keller

2006

Composites Science and Technology

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Section: Size Effects On Strength In Frp Materialsmentioning

confidence: 99%

Probabilistic strength prediction for double lap joints composed of pultruded GFRP profiles – Part II: Strength prediction

Vallée

Correia

Keller

2006

Composites Science and Technology

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“…Based on various failure probability distributions, it can be explicitly expressed in terms of mean strength (or lifetime) as a function of specimen In eq. (15) we have presented the size effect for the chain-like material in terms of volume instead of the number of elements n. Accordingly, a plot of log(a) versus log(V) gives a straight line with negative slope -{l/[s(p + l)]}, that is,l/b. Thus, the size effect in a strength experiment depends uniquely on b, the shape parameter of the strength distribution, itself a function of s and p. Since p > 20 and s I 1 are typical, the size effect in strength is relatively mild.…”

Section: Weakest Link Statistical Modelmentioning

confidence: 99%

“…The parameters of the Weibull distribution for strength are shown to possess a kinetic interpretation [eqs. (9), (lo), (14), (15)]. In particular, the Weibull scale parameter [that is, r in eq.…”

Section: Weakest Link Statistical Modelmentioning

confidence: 99%

Stochastic concepts in the study of size effects in the mechanical strength of highly oriented polymeric materials

Wagner

1989

J Polym Sci B Polym Phys

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A study of size effects in the ultimate mechanical properties of crystalline and semicrystalline polymeric materials (fibers, single crystals) is conducted. The concept of size effect and its importance are discussed. A statistical/stochastic approach is adopted and is shown to yield analytical predictions which are at least as accurate as other modeling schemes (mainly based on fracture mechanics theory) previously proposed in the literature. Within this framework, we propose a possible scheme for simultaneous interpretation of both longitudinal (gauge length) and transversal (diameter) size effects, which provides some interesting information regarding the type of flaw population present in a given polymeric material. The statistical scheme used is based on the Poisson/Weibull model, and variants of it, since this model is relatively well established from both physical and experimental viewpoints. Some unsolved problems inherent to the Weibull/weakest link model for failure are discussed, and a new distribution function for the strength of solids is derived. This is illustrated through an analysis of available experimental data for ultrahigh‐molecular‐weight polyethylene, poly‐p‐phenylene terephthalamide (Kevlar), polydiacetylene, and polyoxymethylene. A maximum likelihood approach is used for the first time for interpreting the effect of diameter variability on the mechanical strength of polymeric fibers. We propose a procedure by which the Weibull shape parameter is maximized over a continuous range of values of the size exponent. Finally, we conjecture on the relative roles of defect populations distributed over the boundary and in the bulk.

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“…Under the viewpoint of the structural design of pressure vessels, it is very important to identify how the fiber strength is changed when progressing from the basic fiber unit to the final structure. Therefore, there had been lots of studies on the size effect of composite materials in order to obtain a reasonable analytical method [2–14]. Especially, Wisnom [5] reviewed lots of literatures and indicated that considering the size effect on strength is important when using strength data from small coupons in the design of large structures.…”

Section: Introductionmentioning

confidence: 99%

“…Tabiei and Sun [8, 9] extended the SMFM, which can be applied not only to the layer thickness but also to the width and length. Several researchers have studied the size effect of fiber strength in composite pressure vessels [9–11]. They presented opposite results for the size effect of fiber strength.…”

Section: Introductionmentioning

confidence: 99%

Experimental and analytical approach for the size effect on the fiber strength of CFRP

Hwang

Kim

2013

Polymer Composites

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In this article, experimental test and an analytical approach were conducted to verify the fiber tensile strength of filament wound pressure vessel. As a test method, improved hoop ring test method was considered. From a series of fully scaled hoop ring tests, the size effect showed the clearly observed tendency toward fiber strength degradation with increasing stressed volume. As an analytical method, Weibull weakest link model and the sequential multistep failure model (SMFM) were considered and compared with the test data from hoop ring test and unidirectional specimens test. It was found that the Weibull weakest link model and the SMFM significantly overestimate the size effect on fiber strength. Thus, the fiber strength showed much lower values than those of test data. In this study, an improved SMFM was proposed by considering a modification of the length size effect. Because this model enhances the accuracy of predicting the fiber strength, the fiber strengths from the improved SMFM showed good agreement with the test data.

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The effect of specimen size on the strength of cfrp

Cited by 64 publications

References 2 publications

Probabilistic strength prediction for double lap joints composed of pultruded GFRP profiles – Part II: Strength prediction

Probabilistic strength prediction for double lap joints composed of pultruded GFRP profiles – Part II: Strength prediction

Stochastic concepts in the study of size effects in the mechanical strength of highly oriented polymeric materials

Experimental and analytical approach for the size effect on the fiber strength of CFRP

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