In biomechanics, which term is defined as the ratio of deformation to original length?

In biomechanics, which term is defined as the ratio of deformation to original length?

• A. An absolute measure of deformation
• B. Change in length divided by original length
• C. A material's stiffness
• D. Tensile strength

Answer: (B)

Strain is the ratio of deformation to the original length. It is defined as ε = ΔL / L0, where ΔL is the change in length and L0 is the original length. Because it’s a ratio, strain is dimensionless and lets you compare how much different tissues or structures stretch regardless of their initial size. For example, a tendon that lengthens by 2 mm when it starts at 100 mm has a strain of 0.02 (2%). This differs from the absolute deformation (the 2 mm alone) and from stiffness or tensile strength, which describe how much force is needed to deform or how much stress a material can withstand before failure, respectively. In biomechanics, measuring strain helps quantify tissue stretch during movement or loading in a size-independent way.

Strain is the ratio of deformation to the original length. It is defined as ε = ΔL / L0, where ΔL is the change in length and L0 is the original length. Because it’s a ratio, strain is dimensionless and lets you compare how much different tissues or structures stretch regardless of their initial size. For example, a tendon that lengthens by 2 mm when it starts at 100 mm has a strain of 0.02 (2%). This differs from the absolute deformation (the 2 mm alone) and from stiffness or tensile strength, which describe how much force is needed to deform or how much stress a material can withstand before failure, respectively. In biomechanics, measuring strain helps quantify tissue stretch during movement or loading in a size-independent way.