The fracture characteristic of high fly ash volume concrete is studied,testing and evaluating the fracture characteristic and fracture toughness of different fly ash volume concrete,different fracture degree of depth,and many kinds of fly ash volume concrete. The comparative analysis to the peak load,the largest stress and fracture toughness of the different fly ash volume concrete,and multiregression equations of the peak load,the largest stress and fracture toughness are built according to the reality testing the data.
According to fracture characteristic of concrete beams,the influence of main factors such as size effect,concrete strength and relative crack length on fracture toughness is discussed.
In particular, such steels can be susceptible to delayed fracture characteristic for high-strength steels with a martensite or bainite structure.
The microstructure and fracture characteristic of a pressureless-sintered (Si-Al-O-N)-6 wt% SiC composite have been investigated by a combination of transmission electron microscopy and microindentation fracture technique.
Fracture characteristic of a (Si-Al-O-N)-SiC composite studied by transmission electron microscopy
Typical fracture characteristic values like load-displacement curve and specific fracture energy of the new wood laminate compound PARALLAM? PSL were determined by using the wedge splitting technique.
The fracture characteristic of this cultivar was that a few large fractures occurred globally.
The present work deals mainly with alunite expanding cement, its technical requirementsand hydration behaviors. Portland cement is the matrix of the cement while natural alu-nite which is used in place of calcined alunite is the expanding component, and flyashor blast furnace slag is the expanding stabilizer. Expansion, strength, self-stressing,permeability and fracture characteristics of the alunite are described. According to XRD,DTA and EM results, the characteristics of this cement in hardening...
The present work deals mainly with alunite expanding cement, its technical requirementsand hydration behaviors. Portland cement is the matrix of the cement while natural alu-nite which is used in place of calcined alunite is the expanding component, and flyashor blast furnace slag is the expanding stabilizer. Expansion, strength, self-stressing,permeability and fracture characteristics of the alunite are described. According to XRD,DTA and EM results, the characteristics of this cement in hardening process are discussed.
This paper deals with the analysis of results of in-situ load bearing capacity test on the worksites of five hydroelectric projects. Research has shown that in-situ load bearing capacity test is an effective method for studying the deformation and fracture characteristics of soft rock. It may be a complement to the insufficiency of laboratory studies of soft rock. The pressure deformation curves of the fracture clayrock, silty mudstone may be divided into four stages: compression of fissures, linear...
This paper deals with the analysis of results of in-situ load bearing capacity test on the worksites of five hydroelectric projects. Research has shown that in-situ load bearing capacity test is an effective method for studying the deformation and fracture characteristics of soft rock. It may be a complement to the insufficiency of laboratory studies of soft rock. The pressure deformation curves of the fracture clayrock, silty mudstone may be divided into four stages: compression of fissures, linear deformation, yield of rock mass and plastic flow of rock mass.The author suggests using the point of inflection of pressure-deformation curves of rock mass around the bearing plate ( corresponding to the point of raising up of the rock mass) as the criterion of yielding limit, and using the point of departure from a straight line as the criterion of proportion limit.Stratified and fracture rock ruptures along the bedding plane at first. And then the rock mass itself ruptures gradually without obvious linear deformation. Before reaching the strength limit there is a great plastic deformation which appears to be typical plastic failure.
Based on the results of experiment with fracture toughness of reasoned body by using compact tensile samples, the fracture characteristics respecting the fracture section and direction of crack extension, etc, were described in this paper. Simultaneously, the fracture toughness was analysed, and calculated by means of J-integrals adopting the theory of elastoplastic fracture. The P—⊿ curve of reasoned body was also discussed and the conclusions were obtained respectively.
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fracture characteristic
断裂特征
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