What is the standard value of Poisson’s ratio for cast iron_________________?
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Answer: B. 0.23 to 0.27
Explanation
The standard Poisson ratio for cast iron typically ranges between zero point two three and zero point two seven. This material constant reflects the specific volumetric and lateral strain relationships exhibited by gray and ductile cast irons. Microscopic graphite flakes embedded within the iron matrix influence its overall elastic response and measured Poisson ratio. Cast iron is an iron-carbon alloy containing higher carbon percentages alongside silicon, resulting in excellent compressive strength. Poisson ratio is dimensionless and links lateral contraction to longitudinal extension during elastic tensile or compressive loading. Material testing standards provide these specific ratio ranges to assist engineers in accurate multi-axial stress calculations.
Ranges between zero point one and zero point two underestimate the standard elastic lateral contraction behavior of cast iron. Broader ranges like zero point two five to zero point three three are more typical of steels rather than standard cast iron alloys. High values from zero point four to zero point six are physically unrealistic for standard isotropic engineering metallic materials.
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- Engineering
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- Mechanical Engineering
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- —
- Difficulty
- medium
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