The invention discloses a
test fixture for simply supported beam
fatigue loading and a use method of the text fixture, and belongs to the technical field of test fixtures. The
test fixture comprises a fixture I arranged on the midspan of a simply supported beam, a fixture II and a vibrating motor, the fixture II and the vibrating motor are arranged at the two ends of the simply supported beam respectively, the fixture I comprises a fastening plate I, a fastening plate II, screws, nuts, clamping plates and load ribs which are arranged on the upper side and the lower side of the simply supported beam, the fastening plate I is connected with the fastening plate II through the screws and the nuts, the clamping plates are arranged on the portions, on the two sides of the simply supported beam, of the opposite surfaces of the first fastening plate I and the fastening plate II, it is guaranteed that the simply supported beam does not move or topple over in the
fatigue loading process, two load ribs are arranged between the fastening plate I and the simply supported beam and between the fastening plate II and the simply supported beam separately, a three dividing point loading form is formed, the portion, between every two load ribs, of the simply supported beam forms a
pure bending section, and the vibrating motor is arranged on the upper portion of the fastening plate II at the upper end of the simply supported beam. By means of the load ribs, the
dead weight and fatigue load of the fixtures and the vibrating motor are transmitted to the simply supported beam, and a test specimen cannot
jitter under the action of a dynamic load.