Answer / Amita Raj

The Maximum Stress Theory, Maximum Strain Theory, and Ultimate Strength Theory are the three main theories that explain failure under static load. The Maximum Stress Theory states that failure occurs when the maximum principal stress exceeds the material's ultimate strength in that direction. The Maximum Strain Theory suggests that failure occurs when the maximum principal strain reaches a critical value, regardless of the orientation. Lastly, the Ultimate Strength Theory assumes that failure occurs when the material reaches its ultimate strength in any direction and can be used for ductile materials.

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