scholarly journals Determination of heating or cooling schedule of brittle materials from the stand point of thermal failure

1967 ◽  
Vol 75 (867) ◽  
pp. 315-324
Author(s):  
Manabu TAKATSU ◽  
Akio TAKAMI
Keyword(s):  
Brittle Materials ◽  
Thermal Failure ◽  
Cooling Schedule

scholarly journals The determination of the thermal reliability criterion for building envelope structures

2019 ◽  
Vol 13 (2) ◽  
pp. 129-133
Author(s):  
Gennadiy Farenyuk
Keyword(s):  
Thermal Insulation ◽  
Building Energy ◽  
Energy Performance ◽  
Building Envelope ◽  
Time Analysis ◽  
Thermal Reliability ◽  
Thermal Failure ◽  
Reliability Criterion ◽  
Building Operation

The paper presents the basic methodical principles for the time analysis of the variations of envelope structures’ thermal insulation properties and for the substantiation of the thermal reliability criterion, which should allow the analysis of the actual parameters of heat losses during the operation of buildings. In the paper, the state of the envelope structures thermal failure, the concept of building thermal envelope thermal reliability and the principles of its rating are defined. The physical meaning and basic criterion of the envelope structure thermal reliability are formulated. The application of the thermal reliability criterion allows determining the probable variations in the thermal insulation properties during the building operation and, accordingly, the changes of the building energy performance over time.

scholarly journals Determination of uniaxial tensile strength of brittle materials using tubular samples

2021 ◽  
Vol 833 (1) ◽  
pp. 012016
Author(s):  
D J Guerrero-Miguel ◽  
M I Alvarez-Fernández ◽  
M B Prendes-Gero ◽  
C González-Nicieza
Keyword(s):  
Tensile Strength ◽  
Brittle Materials ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Strength

Convergence Study on Application of the Over-Deterministic Method for Determination of Near-Tip Fields in a Cracked Plate Loaded in Mixed-Mode

2012 ◽  
Vol 249-250 ◽  
pp. 76-81 ◽  
Author(s):  
Lucie Šestáková ◽  
Václav Veselý
Keyword(s):  
Mixed Mode ◽  
Brittle Materials ◽  
Higher Order ◽  
Displacement Fields ◽  
Deterministic Method ◽  
Crack Behavior ◽  
Stress And Displacement Fields ◽  
Higher Order Terms ◽  
Convergence Study

Multi-parameter description of crack behavior in quasi-brittle materials offers still enough space for investigations. Several studies have been carried out by the authors in this field [1-3]. One part of the publications by the authors (this work included) contain analyses of the accuracy, convergence and/or tuning of the over-deterministic method that enables determination of the coefficients of the higher-order terms in Williams expansion approximating the stress and displacement fields in a cracked body without any complicated FE formulations. These intermediate studies should bring together a list of recommendations how to use the ODM as effectively as possible and obtain reliable enough values of coefficients of the higher-order terms. Thus, the stress/displacement field can be determined precisely even in a larger distance from the crack tip, which is crucial for assessment of the fracture occurring in quasi-brittle materials.

Determination of crack-free mechanical properties of brittle materials via single nanoindentation

2020 ◽  
Vol 191-192 ◽  
pp. 8-25 ◽  
Author(s):  
Kwangmin Lee ◽  
Karuppasamy Pandian Marimuthu ◽  
Jin Haeng Lee ◽  
Felix Rickhey ◽  
Jungmoo Han ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Brittle Materials

Existence and Convergence Questions in Computational Modelling of Crack Growth in Brittle and Quasi-Brittle Materials

2016 ◽  
Vol 258 ◽  
pp. 157-160 ◽  
Author(s):  
Jiří Vala
Keyword(s):  
Crack Growth ◽  
Cohesive Zone ◽  
Cohesive Zone Model ◽  
Computational Modelling ◽  
Brittle Materials ◽  
Zone Model ◽  
Static Tests ◽  
Materials Used ◽  
Proper Analysis

Computational modelling of the crack growth in brittle and quasi-brittle materials used in mechanical, civil, etc. engineering applies the cohesive zone model with various traction separation laws; determination of micro-mechanical parameters comes then from static tests, microscopic observation and numerical calibration. Although most authors refer to ill-possedness and need of artificial regularization in inverse problems (identification of material parameters), some difficulties originate even in nonlinear formulations of direct and sensitivity problems. This paper demonstrates the possibility of proper analysis of the existence of a weak solution and of the convergence of a corresponding numerical algorithm for such model problem, avoiding non-physical assumptions.

Determination of fracture toughness and fracture energy of brittle materials under impact wedging

1996 ◽  
Vol 37 (4) ◽  
pp. 586-594 ◽  
Author(s):  
A. S. Eremenko ◽  
S. A. Novikov ◽  
V. A. Sinitsyn ◽  
V. A. Pushkov ◽  
M. M. Yakupov
Keyword(s):  
Fracture Toughness ◽  
Fracture Energy ◽  
Brittle Materials
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