Measuring device for percentage elongation after fracture of tensile test piece

The utility model discloses a measuring device for percentage elongation after fracture of a tensile test piece in the field of metal material tensile test, which comprises a guide rail, two end supports, end baffles, two top test piece bolts and lock bolts; the two end supports are fixed at the two ends of the guide rail through the lock bolts; the end baffles are fixed at the two ends of the guide rail so as to prevent the end supports from sliding off from the guide rail during working; the two top test piece bolts respectively penetrate through the two end baffles and hold out against the two ends of the fractured test piece to joint the two ends together; the section shape of the guide rail is of an I-shape; the upper surface of the guide rail is provided with a plurality of pits along length direction; and the lower part of the fractured test piece is provided with a cushion block with a matched height. The measuring device for percentage elongation after fracture of the tensile test piece can improve the working efficiency and measuring accuracy, and can be operated by one operator to complete measuring work; moreover, the measuring device for percentage elongation after fracture of the tensile test piece has low cost, is convenient and reliable to use, can be applicable to the tensile test piece of different specifications, and has better adaptability and practical value.