Test rig for fatigue testing of a test specimen , wherein the test rig comprises: - at least one support , configured to support the test specimen, - a first excitator , comprising a connector for connecting the first excitator to a first end of the test specimen and configured to subject the first end of the test specimen to a first forced vibratory load, wherein a direction of the first forced vibratory load extends in a first plane (P1), - a second excitator , comprising a connector for connecting the second excitator to a second end of the test specimen, opposing the first end, and configured to subject the second end of the test specimen to a second forced vibratory load, wherein a direction of the second forced vibratory load extends in a second plane (P2), and wherein the second plane is aligned parallel to the first plane, wherein the first excitator and the second excitator each comprise an excenter , wherein the excenter comprises an eccentric mass , which is rotatable around an axis of rotation (RA) in order to generate an eccentric force (F) and wherein each of the excenters is configured to transmit a respective eccentric force onto a respective end of the test specimen in order to subject the test specimen to the forced vibratory loads, wherein an axis of rotation of the excenter of the first excitator is aligned concentrically with an axis of rotation of the excenter of the second excitator and wherein a longitudinal axis (LA) of the test specimen is adapted to be aligned concentrically with the axes of rotation of the excenters, characterized in that the eccentric mass in the excenter of the first excitator is configured to rotate in a first direction, wherein the eccentric mass in the excenter of the second excitator is configured to rotate in a second direction, and wherein the first direction is opposite to the second direction. - at least one support , configured to support the test specimen, - a first excitator , comprising a connector for connecting the first excitator to a first end of the test specimen and configured to subject the first end of the test specimen to a first forced vibratory load, wherein a direction of the first forced vibratory load extends in a first plane (P1), - a second excitator , comprising a connector for connecting the second excitator to a second end of the test specimen, opposing the first end, and configured to subject the second end of the test specimen to a second forced vibratory load, wherein a direction of the second forced vibratory load extends in a second plane (P2), and wherein the second plane is aligned parallel to the first plane, wherein the first excitator and the second excitator each comprise an excenter , wherein the excenter comprises an eccentric mass , which is rotatable around an axis of rotation (RA) in order to generate an eccentric force (F) and wherein each of the excenters is configured to transmit a respective eccentric force onto a respective end of the test specimen in order to subject the test specimen to the forced vibratory loads, wherein an axis of rotation of the excenter of the first excitator is aligned concentrically with an axis of rotation of the excenter of the second excitator and wherein a longitudinal axis (LA) of the test specimen is adapted to be aligned concentrically with the axes of rotation of the excenters, characterized in that the eccentric mass in the excenter of the first excitator is configured to rotate in a first direction, wherein the eccentric mass in the excenter of the second excitator is configured to rotate in a second direction, and wherein the first direction is opposite to the second direction. <EOS>