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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