Abstract
A low-cost computer-based tensile testing apparatus is described that allows a graphicaldisplay of force–extension curves during the stretching of specimens in real time.The experiment is based on a graphics tablet combined with a force sensor. Itcan be used in a material science laboratory to investigate elastic and plasticdeformations in different materials and to model the underlying molecular mechanisms.Measurements on wires, rubber bands and spider silk are discussed in terms of energy andentropy spring models of elastic forces. Entropy springs play an important role insoft matter and underlie the intriguing mechanical properties of many biologicalmaterials.
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