scholarly journals Fracture Toughness ^|^amp; Fracture Performance Evaluation

2009 ◽  
Vol 78 (5) ◽  
pp. 453-455
Author(s):  
Mitsuru OHATA
Keyword(s):  
Fracture Toughness ◽  
Performance Evaluation ◽  
Fracture Performance

scholarly journals Significance of Shallow Notch CTOD Test. Fracture Toughness Measurement for Fracture Performance Evaluation of Weldments.

1993 ◽  
Vol 11 (3) ◽  
pp. 454-460 ◽  
Author(s):  
Masao Toyoda ◽  
Fumiyoshi Minami ◽  
Claudio Ruggieri ◽  
Kiyoshi Bessyo ◽  
Kazushige Arimochi ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Performance Evaluation ◽  
Fracture Toughness Measurement ◽  
Fracture Performance ◽  
Toughness Measurement

scholarly journals Effect of Sand Size on Mechanical Performance of Cement-Based Composite Containing PVA Fibers and Nano-SiO2

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 325 ◽  
Author(s):  
Yi-Feng Ling ◽  
Peng Zhang ◽  
Juan Wang ◽  
Yan Shi
Keyword(s):  
Fracture Toughness ◽  
Mechanical Performance ◽  
Silica Sand ◽  
Fine Aggregate ◽  
Reinforced Composites ◽  
Nano Sio2 ◽  
Flexural Tensile Strength ◽  
Fracture Performance ◽  
Sand Particles ◽  
Sand Size

Both finer sand and nanoparticles have a filler effect on mechanical performance of cement-based composite. In this paper, the influence of sand size in mechanical performance of cement-based composites, containing polyvinyl alcohol fiber (PVA) and nano-SiO2 (NS), was investigated. The studied mechanical performance, included compressive, flexural, tensile strength, and fracture toughness. A 0.9% volumetric percentage of PVA and a 2% NS mass content were used to make cement-based composites with a 0.38 w/b. Silica sand with four sand size ranges (380–830 μm, 212–380 μm, 120–212 μm and 75–120 μm) was adopted as fine aggregate. The 28-day curing was conducted for all specimens under 20 °C and 95% humidity. It is concluded that the finer sand decreased workability and mechanical strength of PVA-reinforced composites containing NS. However, this reduction was very limited for the sand particles less than 380 µm. The ultimate tensile stain, fracture toughness, and energy were decreased as sand size declined. In addition, the fracture performance of the composites was greatly dependent on fracture energy.

Evaluation of flexural fracture toughness for quasi-brittle structural materials using a simple test method

2002 ◽  
Vol 29 (4) ◽  
pp. 567-575 ◽  
Author(s):  
M.M Reda Taha ◽  
X Xiao ◽  
J Yi ◽  
N G Shrive
Keyword(s):  
Fracture Toughness ◽  
Fracture Mechanics ◽  
Brittle Fracture ◽  
High Performance ◽  
High Performance Concrete ◽  
Fibre Reinforced Concrete ◽  
Simple Test ◽  
Elastic Crack ◽  
Fracture Performance ◽  
Brittle Fracture Mechanics

As new structural concepts such as partial prestressing and steel-free bridge decks are more widely accepted and used, there is an increasing need for a reliable and reproducible fracture performance criterion that can describe resistance to crack growth. The required criterion should also be easy to determine experimentally so that it can be incorporated in structural specifications. The nonlinear behaviour of concrete and masonry materials suggested that quasi-brittle fracture mechanics approaches may be the most suitable for determining their fracture performance. The effective elastic crack model originally developed by Karihaloo and Nallathambi (1989) was modified to evaluate the critical crack depth under pure flexural stresses. A computer program was developed to calculate this depth iteratively from the experimental results. An experimental programme examining the fracture performance of four different structural materials (high performance concrete, mortar, fibre reinforced concrete, and masonry units) was carried out to examine the applicability of the model. As no post-peak data are required for the analysis, the model allows the use of a simple test setup to evaluate the fracture performance of quasi-brittle materials experimentally.Key words: fracture toughness, linear elastic fracture mechanics (LEFM), elastoplastic fracture mechanics (EPFM), quasi-brittle fracture mechanics, effective elastic crack, high performance concrete, masonry, fibre reinforced concrete.

Relationship Between Weibull Parameter and Fracture Toughness of Structural Steels

2008 ◽  
Author(s):  
Tsunehisa Handa ◽  
Hiroshi Mimura ◽  
Mitsuru Ohata ◽  
Fumiyoshi Minami
Keyword(s):  
Fracture Toughness ◽  
Test Specimen ◽  
Fracture Process ◽  
Shape Parameter ◽  
Process Zone ◽  
Structural Components ◽  
Stress Criterion ◽  
Plastic Constraint ◽  
Fracture Performance ◽  
Weibull Stress

The brittle fracture assessment for structural components excluding an excessive conservatism should be conducted under the concept of fitness-for-service assessment. One of the factors that lead to such a conservative estimation of brittle fracture performance is no consideration of plastic constraint loss in structural components compared to the fracture toughness test specimen. The Weibull stress criterion is expected to correct the CTOD (Crack Tip Opening Displacement) fracture toughness of materials to the critical CTOD for structural components of concern through the same level of Weibull stress, which take into account not only the difference in plastic constraint but also volume of fracture process zone between toughness test specimen and structural components. On the basis of the Weibull stress criterion, the fracture driving force, that is the Weibull stress, is dependent on the Weibull shape parameter m. Furthermore, such dependency is influenced by both the plastic constraint level and the volume of fracture process zone for specimens of interest. The different m-value would result in the different correction ratio of the fracture toughness to the critical CTOD for structural components. Accordingly, the parameter m should be estimated for the appropriate fracture performance evaluation in consideration of constraint loss correction. In this paper, a simple method for estimating the Weibull shape parameter m were introduced. That is the effort to address the factors to affect the m-value in terms of strength class and toughness level of materials based on the data from literatures, which is for efficient and rational estimation of m-value without any experimental and numerical works.

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