Step-by-step explanation:
True strain is defined as the natural logarithm of the ratio of the final length and the initial length of a specimen. Necking is defined as a localized decrease in the cross-sectional area of a material when subjected to tensile loading.
For an engineering material to exhibit necking, the true strain should reach a certain critical value. This critical value can be calculated by solving the following equation:
ln(Lf/Li) = C
where Lf is the final length of the specimen, Li is the initial length of the specimen and C is the critical strain at which necking will begin.
Therefore, the true strain at which necking will begin can be determined by solving the given equation for C.
Yes, it is possible for an engineering material to exhibit necking. Necking occurs when the material is subjected to tensile loading and the true strain reaches a certain critical value.