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Principles of Energy Conversion
Published in Hamid A. Toliyat, Gerald B. Kliman, Handbook of Electric Motors, 2018
Hamid A. Toliyat, Gerald B. Kliman
Babbitt metal has very desirable frictional characteristics and bearing-metal characteristics. It has low surface hardness, in the range 10 to 15 Brinell at 100∘C, and the hardness decreases rapidly at high temperatures. The modulus of elasticity of lead-based babbitt is approximately 2×106 pounds/ inch 2 and of tin-based babbitt is approximately 6×106 pounds/inch2. This permits good conformability of the bearing to the journal and the journals do not usually need to be hardened beyond the degree inherently present in the shaft steel.
Miscellaneous Machine Component Failures – Chains, Lip Seals, Couplings, Universal Joints, and Plain Bearings
Published in Neville W. Sachs, Practical Plant Failure Analysis, 2019
Babbitt metal is relatively weak and has a low fatigue strength so both the thickness of the layer and the quality of the bond between it and the backing metal is critical, and research has shown that, the thicker the babbitt, the more likely that a fatigue crack will occur.
A New Design Chart Method of Journal Bearings Based on a Simplified Thermohydrodynamic Lubrication Theory
Published in Tribology Transactions, 2020
Babbitt-lined bearing surfaces are widely used in oil film bearings for high-speed rotating machinery. The tensile strength of babbitt metal decreases with temperature, eventually resulting in bearing surface damage called melting and wiping around the minimum oil film thickness position where the maximum shearing force and maximum bearing temperature are normally found. Consequently, high-speed journal bearings need be designed so that in operation never exceeds a prescribed upper limit.