Why is that the shape of the tension test specimen a dogbone-like shape?
I know that it is so that the deformation is confined to the narrow center region and to reduce the likelihood of fracture to occur at the ends of the specimen. But why is this so important? Why can't a cylinder shaped specimen that has a uniform radius all along the specimen be used? Why does it, for example, matter if it fractures near the end (near the region where you clasped the specimen in the machine)?