Statistical distributions and their influence on the material property values of tropical timber: Case study of Gmelina arborea

Iwuoha, Stanley Emeka; Seim, Werner; Olaniran, Samuel Oluyinka

doi:10.1016/j.istruc.2023.04.059

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…To answer this, the data from the ring-onring tests has been analyzed using Weibull plots in the MATLAB R2022a software. There is considerable discussion in the literature about the limitations of using Weibull distributions for glass failure statistics (Tumidajski, 2006;Kinsella and Persson, 2016;Iwuoha et al, 2023), many authors stated that the method is not reliable in determining the strength of materials. This does not affect the nature of the analysis made here which endeavours to understand the differences between distinct groups of data.…”

Section: Discussionmentioning

confidence: 99%

A Novel Method for the Non-Destructive Assessment of Strength Degradation and Re-Use Potential of Weathered Float Glass From Facades: A Proof of Concept Study

Veer,

Overend,

Sofokleous

et al. 2023

International Journal of Structural Glass and Advanced Material

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Lack of knowledge about the properties of weathered (used) glass is currently a major barrier to glass reuse. This results in probably unnecessary recycling or down-cycling of architectural glass at the end of life. Avoiding this creates a significant opportunity to reduce resource depletion and decarbonize the built environment. This can be done by developing an optical non-destructive test method that estimates the strength of naturally weathered glass by characterizing surface flaws. This allows excessively damaged glass panels to be removed for surface repair or recycling. Specimens were made from 50 + -year-old monolithic flat glass taken from a façade in the Hague, Netherlands, where it was exposed to salt in the air, water, cleaning, and abrasion from wind-driven dust and sand particles. The specimens were examined using a microscope and a handheld optical profilometer to determine surface flaw characteristics. The glass specimens were then tested using a ring-on-ring (coaxial double ring) setup. Similar tests were also conducted on new as-received float glass to provide a benchmark. Both the indoor-facing and outdoor-facing sides of the weathered glass and the air and tin side of the new glass were tested. A statistical analysis of the test results was made using conventional Weibull statistics. The results show that after 50 + years of natural aging the strength of the glass is significantly reduced and that the non-destructive scanning method trialed in this study can locate and determine in many cases the size of critical surface defects thereby allowing for direct safe re-use of 70 + % of the glass. The handheld optical profilometer can identify severe damage on the glass, but further research and software development is needed to improve the accuracy and consistency of the scanning method and to automate this technique for routine/large-scale applications including as a prerequisite for surface repair.

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Section: Discussionmentioning

confidence: 99%

A Novel Method for the Non-Destructive Assessment of Strength Degradation and Re-Use Potential of Weathered Float Glass From Facades: A Proof of Concept Study

Veer,

Overend,

Sofokleous

et al. 2023

International Journal of Structural Glass and Advanced Material

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Statistical aspects of diffusive adhesion between polymers with drastically different molecular mobility: Weibull’s and normal probability analysis

Boiko

2024

The Journal of Adhesion

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Phenomenon of room-temperature interdiffusion self-bonding between entangled glassy polymers: a statistical study

Boiko

2024

Preprint

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A comprehensive statistical analysis of the distributions of the adhesion strength (σ) developed during a long-term contact (up to 2 months) of two identical specimens of an amorphous entangled polymer at a very low temperature (T) of 24°C with respect to the bulk glass transition temperature (Tg), below Tg by 80°C, was carried out. For this purpose, two representative glassy polymers, polystyrene [PS; three PSs differing markedly in the number-average molecular weight (Mn) from 75 to 966 kg/mol] and poly(methyl methacrylate) (PMMA; Mn = 43.5 kg/mol), were selected. Keeping in contact the two specimens of PS or PMMA at T = 24°C resulted in self-bonding at PS-PS and PMMA-PMMA interfaces. The as-self-bonded interfaces were shear fractured in tension to measure their σ values. The four σ distribution sets obtained for such a low T for the first time were examined using a number of common formal tests for normality and graphical statistical methods, including Weibull’s model. In general, the σ distributions for the PS with the highest Mn = 966 kg/mol were described more correctly than those for the other three polymers, regardless of the statistical methods applied. These results were compared with those obtained after self-bonding at a significantly higher T = Tg − 33°C for the same polymers. The statistical parameters estimated at markedly different temperatures (T = Tg − 80°C and Tg − 33°C) were compared and discussed.

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Statistical distributions and their influence on the material property values of tropical timber: Case study of Gmelina arborea

Cited by 3 publications

References 13 publications

A Novel Method for the Non-Destructive Assessment of Strength Degradation and Re-Use Potential of Weathered Float Glass From Facades: A Proof of Concept Study

A Novel Method for the Non-Destructive Assessment of Strength Degradation and Re-Use Potential of Weathered Float Glass From Facades: A Proof of Concept Study

Statistical aspects of diffusive adhesion between polymers with drastically different molecular mobility: Weibull’s and normal probability analysis

Phenomenon of room-temperature interdiffusion self-bonding between entangled glassy polymers: a statistical study

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