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  • 1980-1984  (6)
Source
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Influence of strengthening by deep etching in hydrofluoric acid on the strength in axial tension of technical glass (1982)
    Springer
    Strength of materials 14 (1982), S. 254-258 
    Details
    ISSN: 1573-9325
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. The relationship of the axial compressive strength of sheet-glass samples ground and chemically treated in a hydrofluoric acid solution to the depth of the layer removed was experimentally established. 2. The axial compressive strength of cylindrical samples after etching to a depth of not less than 50μm depends upon their form and the chemical composition of the glass. The maximum strengthening (∼ 50%) is obtained for sheet-glass cylindrical samples. 3. Failure of glasses and devitrified glasses in axial compression and bending starts from the outer surfaces. As a result, to increase the supporting capacity and reliability of critical highly stressed objects of technical glasses and devitrified glasses the choice of such production methods of treatment of brittle cross sections and service parameters as would eliminate the accumulation of mechanical damages during assembly, storage, and service of a part is very important. 4. Strengthening of glass materials by removal of the cracked layer in hydrofluoric acid causes an increase in compressive and bend strengths. Therefore, use of the method considered is recommended for increasing the supporting capacity of parts operating in the three-dimensionally stressed state with main stresses of different signs such as cylindrical composite shells loaded by external hydrostatic pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00769070
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of the dimensions of specimens on the strength of electrotechnical porcelain in axial compression (1983)
    Springer
    Strength of materials 15 (1983), S. 837-842 
    Details
    ISSN: 1573-9325
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. In uniform axial compression of polished specimens of electrotechnical porcelain (height three times their diamter), the ultimate strength of 1308 MPa in specimens with 20-mm diameter is 19 and 25% higher than in specimens with 6- and 98-mm diameter respectively. 2. Regardless of the volume of the specimens, the distribution of ultimate strength in axial compression of electrotechnical porcelain is normal. 3. It was proved that, in distinction to pyrocerams, it is promising to use porcelain for large shells with wall thickness of 40 to 100 mm operating under conditions of compression. 4. In loading at constant rate, the amplitude and intensity of acoustic emission are proportional to the square root of the surface area of the specimen. It was noted that it is expedient to use this proportionality for calculating the parameters of the expected AE before large products are tested. 5. At uniform compressive stresses large than 500 MPa, erosion on the surface of electrotechnical porcelain is accompanied by specifics of AE by which it is possible, without inspecting the product visually, to judge if microspallings appear on its surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01524776
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Structural strength of hard porcelain with allowance for technological factors (1984)
    Springer
    Strength of materials 16 (1984), S. 38-43 
    Details
    ISSN: 1573-9325
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. The axial-compressive strength of porcelain specimens cut from piston-type components that had been subjected to plastic shape variation during drying is almost 60% lower than the same value for rods free from compressive forces. 2. It is established that the axial compressive strength of hard porcelain, which had possessed approximately 2% of moisture in its own composition prior to firing, exceeds by nearly 30% the strength of porcelain specimens cut from articles of the ball-mill-component type, which contain 16–18% of moisture prior to firing. In this case, hard-porcelain cylinders glazed once after drying to a moisture content of not more than 2% possess the maximum compressive strength (∼1150 MPa). This strength exceeds by 10 and 15% the temporary strength of unglazed and also thrice-glazed specimens, respectively. 3. It is shown that cylindrical shells with a ratio of wall thickness and length of cylindrical section to the radius of the median section of 0.09–0.11 and 5–6, respectively, the bearing capacity of which may be 40–60 MPa for a one-time loading by external hydrostatic pressure, can be fabricated from hard porcelain. 4. It is established that geometric shape imperfections significantly affect the magnitude of the failing compressive stresses with exhaustion of the bearing capacity of porcelain shells under uniform pressure. In cases where shells of proper circular shape, which can be provided by diamond grinding, are tested, the ultimate stresses are comparable to the ultimate strength of porcelain in axial compression.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01530183
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Strength of porcelain with biaxial compression (1984)
    Springer
    Strength of materials 16 (1984), S. 691-697 
    Details
    ISSN: 1573-9325
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. Strength determined in the fourth quadrant of the coordinate plane for porcelain is 60–70% greater than the level of average failure stresses with loading along two axes by smooth metal supports, depending on the principal stress ratio, and with σ2/σ3=0.25 it reaches a maximum value of 1020 MPa which is 5 and 25% greater than the ultimate strength with axial and uniform compression respectively. 2. For porcelain, concrete, gypsum, graphite, ceramics based on alumina, glass ceramic, and cast iron, strength with biaxial compression and also limiting values of specific potential energy for deformation depend on the principal stress ratio. With a sufficient degree of accuracy this latter function may be approximated by the segment of a straight line. 3. For porcelain, graphite, and ceramics based on alumina there is a range of principal stress ratios in which strength with biaxial compression is less than ultimate strength with axial compression. In view of this, strength analysis for cylindrical and spherical shell articles made of these materials operating under external hydrostatic pressure should be carried out by equivalent stresses. Experimental limiting curves in the third quadrant of the coordinate plane for porcelain, concrete, gypsum, graphite, ceramics based on alumina, glass, glass ceramic, and cast iron may be approximated by an equation expressing the functional relationship between principal compressive stresses, ultimate strength with axial and uniform biaxial compression, Poisson's ratio, and principal stress ratio.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01529052
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Stand for testing glass and ceramic shells under external hydrostatic pressure (1980)
    Springer
    Strength of materials 12 (1980), S. 395-400 
    Details
    ISSN: 1573-9325
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01129100
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Strength of glass ceramic S0115M and its joints based on optical contact (1983)
    Springer
    Strength of materials 15 (1983), S. 378-383 
    Details
    ISSN: 1573-9325
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. Breaking strength for joints based on optical contact with a contact area of 680 mm2 is 1.11 MPa for rectangular cross section specimens. Specimens with an annular configuration and a contact area of 150 mm2 have the highest ultimate strength σf=2.45 MPa. 2. Ultimate strength in axial tension and compression for cylindrical specimens made of optical glass ceramic with high microroughness of the lateral surfaces RZ≤0.63 μm is 59.1 and 2008 MPa respectively, and this exceeds the ultimate breaking strength of joints based on optical contact with an area of 150 mm2 by factors of 24 and 820. 3. In absolutely brittle materials of the optical glass ceramic type forces of mutual attraction operate in annular crack zones predicted by the Leonov-Panasyuk model for the limiting condition, and they promote closing together of the crack sides. It may be assumed that the magnitude of these mutual attraction forces for the crack sides is not less than the breaking stress for joints based on optical contact established in this way. 4. In critical articles of the shell type made of glass and glass ceramic loaded by external hydrostatic pressure, it is possible for cracks to develop during operation. It is not possible to detect these cracks visually due to closing together of the sides after removal of a tensile load. In order to provide reliable operation of similar articles there is considerable practical interest in the search for experimental methods making it possible to reveal cracks in these objects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01523187
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    Paper (German National Licenses)
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