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A human tendon shows a nonlinear stress-strain curve. What does the source call the very first part of that stretch, where the tendon's fibers begin to align in the direction of the applied stress?
AThe linear region, where the fibrils stretch
BThe failure region, where fibers begin to break
CThe toe region, where uncrimping occurs
DThe bulk region, where volume changes dominate
Answer & Solution
Correct answer: C. The toe region, where uncrimping occurs
1. Three regions appear in sequence along a tendon's stress-strain curve.
2. The first is the toe region, where the tendon's fibers begin to align with the direction of the stress, a process the source calls uncrimping.
3. The linear region comes next, where the fibrils themselves stretch, and the failure region comes last, where individual fibers begin to break.
4. Volume-dominated bulk behavior is not part of this tendon stress-strain description at all.
_Source: OpenStax College Physics (CC BY 4.0), Ch 5 "Further Applications of Newton's Laws: Friction, Drag, and Elasticity", section 5.3 Elasticity: Stress and Strain_
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