The change in length per unit length aligned with an applied load is termed_________________?
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Answer: C. linear strain
Explanation
Linear strain is defined as the change in length per unit length along the load. This dimensionless quantity measures the relative deformation of a structural member under tension or compression. Dividing the total elongation by the original gauge length yields the axial linear strain value. Strain is a fundamental concept in strength of materials and continuum mechanics analysis. Tensile loads produce positive linear strain, whereas compressive loads result in negative strain. Hooke law relates linear stress to linear strain through the elastic modulus of the material.
Structural engineers calculate strain to ensure bridges and buildings remain within safe deformation limits. Strain gauges attached to machine components measure operational loads and stress concentrations experimentally. Controlling component elongation prevents premature mechanical failure in precision mechanical assemblies. Lateral strain measures deformation perpendicular to the applied load rather than along its axis. Strain is a dimensionless ratio rather than a stress parameter involving internal force intensities. Unit strain is an informal redundancy, whereas standard engineering terminology specifies linear strain.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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