The Achilles Tendon is about 0.15 m long [1] so the percent stretch is only 0.2% . The amount a material stretches as a fraction of its original length is known as the strain(ε). (Sometimes strain is ...The Achilles Tendon is about 0.15 m long [1] so the percent stretch is only 0.2% . The amount a material stretches as a fraction of its original length is known as the strain(ε). (Sometimes strain is expressed as a percentage by taking the fractional strain and multiplying by 100).
