An experimental study on acoustic emission energy as a quantitative measure of size independent specific fracture energy of concrete beams

Summary The fracture properties of unmodified and modified (heat treatments under various conditions and acetylation) sprucewood are investigated using the wedge splitting test. Fracture parameters measured include critical stress intensity factor and specific fracture energy under Mode I loading and specific fracture energy under Mode III loading. The Mode I fracture properties are reduced by all kinds of modification. However, acetylation leads to a reduction of only 20%whereas heat treatments reduce the properties to a much greater extent, approximately 50%to 80%. The Mode III fracture properties are influenced less. SEM pictures of the fracture surfaces support the described findings.

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Characteristics and implications of acoustic emission energy in the process of deformation and failure of single-joint rockmass (in Chinese)

International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts ◽

10.1016/0148-9062(95)93227-g ◽

1995 ◽

Vol 32 (5) ◽

pp. A213

Keyword(s):

Acoustic Emission ◽

Acoustic Emission Energy ◽

Deformation And Failure ◽

Emission Energy

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Determination of size-independent specific fracture energy of normal- and high-strength self-compacting concrete from wedge splitting tests

Construction and Building Materials ◽

10.1016/j.conbuildmat.2013.07.062 ◽

2013 ◽

Vol 48 ◽

pp. 548-553 ◽

Cited By ~ 31

Author(s):

Héctor Cifuentes ◽

Bhushan L. Karihaloo

Keyword(s):

Fracture Energy ◽

High Strength ◽

Self Compacting Concrete ◽

Specific Fracture Energy ◽

Specific Fracture ◽

Wedge Splitting

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Probabilistic Fracture Energy Assessment of Natural Fibre Reinforced Concrete by Two Parameter Weibull Distribution

International Journal of Engineering & Technology ◽

10.14419/ijet.v7i3.12.16116 ◽

2018 ◽

Vol 7 (3.12) ◽

pp. 407

Author(s):

Neha P Asrani ◽

Murali G ◽

Arthika J ◽

Karthikeyan. K ◽

Haridharan. M.K

Keyword(s):

Weibull Distribution ◽

Fracture Energy ◽

Plain Concrete ◽

Natural Fibre ◽

Test Results ◽

Specific Fracture Energy ◽

Energy Assessment ◽

Experimental Process ◽

Specific Fracture ◽

Two Parameter

Fracture energy is the post-crack energy absorption ability of the material that represents the energy absorbed by the structure at the time of failure. Its analysis has gained importance and hence requires a powerfulmethod for its development. A two parameter Weibull distribution proves to be an efficient tool in analysing the scattered experimental test results. In this paper, the specific fracture energy of plain concrete and concrete reinforced with natural fibres of hemp, wheat straw and elephant grass are statistically analysed by two parameter Weibull distribution by using graphical method. For determining Weibull parameters, 21 equations have been used and the best equation is taken for the reliability analysis. A Weibull reliability curve is plotted, which shows the specific fracture energy at each reliability level. This curve enables an engineer to choose the fracture energy of a particular mix based on its reliability requirement and safety limit. Therefore, reliability curves are a pioneer in statistical analysis as they eliminate the time-consuming and costly experimental process. This method can be applied in areas with similar uncertainties.

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