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单选题
If a fastener is over-torqued, internal stress is present. Internal stress is more important than design stress, because stress corrosion is difficult to recognize before it has overcome the design safety factor. The level of stress varies from point to point within the metal. Stresses near the yield strength are generally necessary to promote stress corrosion cracking.
A
When a fastener is tightened beyond the recommended moment, it creates internal stress. Internal stress is a crucial factor to consider since stress corrosion can be challenging to detect until it has surpassed the safety factor of the design. The level of stress is not uniform throughout the metal and can vary from one point to another. Stress corrosion cracking is usually promoted by stresses that are close to the maximum stress that a material can withstand before it begins to deform .
B
Exceeding the recommended torque when tightening a fastener causes internal stress, which is more significant than design stress.Internal stress is a crucial factor to consider since stress corrosion can be challenging to detect until it has surpassed the safety factor of the design. The level of stress is not uniform throughout the metal and can vary from one point to another. Stress corrosion cracking is usually promoted by stresses that are close to the yield strength, beyond which a material
C
Exceeding the specified moment when tightening a fastener causes internal stress, which is more significant than design stress.Internal stress is a crucial factor to consider since stress corrosion can be challenging to detect until it has surpassed the safety factor of the design. The level of stress is not uniform throughout the metal and can vary from one point to another. Stress corrosion cracking is usually promoted by stresses that are close to the yield strength, beyond which a material w
答案解析
正确答案：B
