The present invention relates to a jig for evaluating a buffer pad. The jig includes a first plate configured to be positioned on one surface of the buffer pad and configured to press the buffer pad; a second plate configured to be positioned on another surface of the buffer pad and configured to press the buffer pad from the other surface; and a magnet member configured to be positioned between the first plate and the second plate. A recessed portion, which is recessed to allow the magnet member to be disposed, is defined at an edge of at least one of the first plate and the second plate.

A fixing jig is provided, including a supporting base, a fixing plate, and a fixing component. The supporting base includes a first upper surface. The fixing plate is disposed on the supporting base. A side of the fixing plate is pivotally connected to the supporting base and includes a second upper surface, a bottom surface, and via a hole. The fixing component presses the fixing plate on the second upper surface. The fixing jig can fix an object pending testing and allows one flexible electric circuit board of the object pending testing to be exposed outside of the fixing jig, so that when performing a pull force test, this can allow an angle between two flexible electric circuit boards to be 90 degrees, thereby improving accuracy of an experimental result.

A fixing jig is provided, including a supporting base, a fixing plate, and a fixing component. The supporting base includes a first upper surface. The fixing plate is disposed on the supporting base. A side of the fixing plate is pivotally connected to the supporting base and includes a second upper surface, a bottom surface, and via a hole. The fixing component presses the fixing plate on the second upper surface. The fixing jig can fix an object pending testing and allows one flexible electric circuit board of the object pending testing to be exposed outside of the fixing jig, so that when performing a pull force test, this can allow an angle between two flexible electric circuit boards to be 90 degrees, thereby improving accuracy of an experimental result.

The present disclosure provides a stress gradient loading test apparatus and a method of accurately determining loading energy, relating to the technical field of a rock mechanical test. The apparatus includes an upper pressure-bearing plate, a specimen fixing device, a stress transfer device, and a simulation specimen. A computer processes stress and strain monitoring data. The stress transfer device includes a plurality of plate-like high strength materials in combination. A simulation roadway is opened in the simulation specimen, and a strain gauge and a stress sensor are disposed on the simulation specimen. In a test using the apparatus, stress gradient loading is realized and elastic strain energy is calculated by the plate-like high strength materials with different stiffnesses of the stress transfer device, and loading energy acting on the simulation specimen is calculated in combination with energy applied by a tester.

The present disclosure provides a stress gradient loading test apparatus and a method of accurately determining loading energy, relating to the technical field of a rock mechanical test. The apparatus includes an upper pressure-bearing plate, a specimen fixing device, a stress transfer device, and a simulation specimen. A computer processes stress and strain monitoring data. The stress transfer device includes a plurality of plate-like high strength materials in combination. A simulation roadway is opened in the simulation specimen, and a strain gauge and a stress sensor are disposed on the simulation specimen. In a test using the apparatus, stress gradient loading is realized and elastic strain energy is calculated by the plate-like high strength materials with different stiffnesses of the stress transfer device, and loading energy acting on the simulation specimen is calculated in combination with energy applied by a tester.

A rig for testing thermomechanical loads comprises grip portions for gripping a test specimen, and a frame that join the grip portions to each other, the thermal expansion coefficient of the grip portions being greater than the thermal expansion coefficient of the frame. The frame may be made from metal.