The value of Poisson's ratio for cast iron is

Poisson's ratio: It is the ratio of lateral strain to longitudinal strain when a material is subjected to axial loading.

Value for cast iron: For cast iron, Poisson's ratio typically ranges between 0.23 and 0.27, depending on its composition and grade.

Reason: Cast iron exhibits brittle behavior and has a lower Poisson's ratio compared to ductile materials, which tend to have higher values. The lower range of Poisson's ratio reflects the limited lateral expansion in cast iron under axial compression or tension.

Significance: Understanding the Poisson's ratio of cast iron is crucial for analyzing its deformation characteristics and ensuring its appropriate use in engineering applications, such as engine blocks and machine parts.