The nature of specimen-size-effect on fatigue crack growth and net-section fracture mechanics approach to extract the size-independent behavior

Chandran, K.S. Ravi; Dorman, Sarah E. Galyon

doi:10.1016/j.ijfatigue.2020.106088

Cited by 9 publications

(9 citation statements)

References 7 publications

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“…They thought that the effective driving force behind the crack inside the thinner specimens is much lower than inside the thicker specimens. Chandran 24 pointed out that the fracture energy theory reveals a unique correlation of the FCG data, when the variation of the net‐section strain energy Δ C is marked as the effective driving force. Meirom 25 proposed that the crack tip constraint declines with enhancing the fracture toughness in metallic materials.…”

Section: Introductionmentioning

confidence: 99%

“…Although encouraging results have been obtained, the specimen thickness effect mechanism and its influence on the FCG rate still needs to be improved. The main reason is that there are no systematic FCG tests examining the thickness‐dependence or illustrating any thickness‐independence 24 . Consequently, a new strategy is proposed to investigate the specimen thickness effect on the FCG rate in high‐strength steels.…”

Section: Introductionmentioning

confidence: 99%

“…The main reason is that there are no systematic FCG tests examining the thickness-dependence or illustrating any thickness-independence. 24 Consequently, a new strategy is proposed to investigate the specimen thickness effect on the FCG rate in high-strength steels. According to the plasticity-induced crack closure and load conditions, the specimen thickness effect would be unified by a thickness factor.…”

Section: Introductionmentioning

confidence: 99%

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A new strategy to clarify the thickness effect on the fatigue crack growth rate in high‐strength steels

Cui

Peng

et al. 2022

Fatigue Fract Eng Mat Struct

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It is generally recognized that the fatigue failure of the cracked engineering components is a crucial issue, especially considering the sample thickness effect. Although numerous methods have been proposed, it is still unclear about the sample thickness effect on the fatigue crack growth (FCG) rate of metallic materials. Based on the plasticity-induce crack closure and crack tunneling effect, we established an improved FCG model with a thickness factor T by the load analysis near the crack tip. The thickness factor could clarify the sample thickness effect on the FCG rate of high-strength steels. Numerous fatigue data demonstrates that the improved model displays a fairly good relationship between the sample thickness and FCG rate. It would provide a new strategy to the FCG rate prediction of cracked structures through small size specimen.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A new strategy to clarify the thickness effect on the fatigue crack growth rate in high‐strength steels

Cui

Peng

et al. 2022

Fatigue Fract Eng Mat Struct

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“…In general, smaller specimens exhibits greater stress at failure than larger ones. Some findings reported in the literature suggest that size effect exists also when testing other properties of concrete like tensile strength [ 13 , 14 , 15 , 16 ] and fracture energy [ 17 , 18 ]. Unfortunately, this problem is much less recognized and described, probably because test results of tensile strength and fracture energy are characterized by higher deviation than the results of compressive strength.…”

Section: Introductionmentioning

confidence: 99%

Length Effect at Testing Splitting Tensile Strength of Concrete

Słowik

Akram

2021

Materials

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Tensile strength of concrete is the basic property when estimating the cracking resistance of the structure and when analysing fracture processes in concrete. The most common way of testing tensile strength is the Brazilian method. It has been noticed that the shape and size of specimens influence the tensile splitting strength. The experiments were performed to investigate the impact of cylinder’s length on tensile concrete strength received in the Brazilian method. During the experiment the tensile concrete strength was tested on two different sizes cylindrical specimens: 150 mm × 150 mm and 150 mm × 300 mm. Experiments were performed in two stages, with two types of maximum aggregate size: 16 mm and 22 mm. The software “Statistica” was used to perform the broad scale statistical analysis. When comparing test results for shorter and longer specimens, the increase of tensile splitting strength tested on shorter cylinders was observed (approximately 5%). However, when performing deeper statistical analysis, it has been found that the length effect was not sensitive to the strength of the cement matrix and the type of aggregate but was influenced by the aggregate size. Further experiments are needed in order to perform a multi-parameter statistical analysis of scale effect when testing the splitting tensile strength of concrete.

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“…Some findings reported in the literature suggest that size effect also plays an important role when testing fracture properties of concrete such as tensile strength ([8]- [10])and fracture energy ( [11]- [12]). Unfortunately, this problem is much less recognized and described.…”

Section: Introductionmentioning

confidence: 99%

Size effect at testing strength properties of concrete

Akram

2021

Bud-Arch

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Various strength characteristics of concrete are considered as fracture parameters. The compressive strength of concrete is of paramount importance when designing concrete structures, whereas tensile strength of concrete is the basic property when estimating cracking resistance of a structure and analysing fracture processes in concrete. When testing the compressive strength of concrete, the results are dependent on the shape and dimensions of used specimens. Some findings reported in the literature suggest that size effect exists also when testing such fracture properties of concrete as tensile strength. Unfortunately this problem is much less recognized and described compared to size effect in compressive test results. In this paper, the experimental investigation is presented on how the length of cylindrical specimens influences the tensile splitting strength of concrete obtained by means of the Brazilian method. Additional variable parameters were: type of aggregate (natural gravel and crushed granite) and cement-water ratio (C/W = 1.8 and C/W = 2.6). In conducted laboratory experiments a higher splitting tensile strength of concrete was noted for all specimens with nominal dimensions of 150×150 mm, compared to specimens 150×300 mm in size, regardless of type of aggregate or cement-water ratio.

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The nature of specimen-size-effect on fatigue crack growth and net-section fracture mechanics approach to extract the size-independent behavior

Cited by 9 publications

References 7 publications

A new strategy to clarify the thickness effect on the fatigue crack growth rate in high‐strength steels

A new strategy to clarify the thickness effect on the fatigue crack growth rate in high‐strength steels

Length Effect at Testing Splitting Tensile Strength of Concrete

Size effect at testing strength properties of concrete

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