53 results about "Displacement ratio" patented technology

The invention discloses a drop hammer type dynamic biaxial extension test device. The drop hammer type dynamic biaxial extension test device is characterized by comprising a base plate, a hammerhead and four groups of clamping devices, wherein the four groups of clamping devices are separately used for clamping four extension arms on a test piece in a one-to-one correspondence mode, the clamping devices are oppositely arranged in pairs, and a sliding device moves in the length direction of the extension arms of the test piece is arranged between the clamping devices and the base plate. The hammerhead is located right above the test piece, and four planes at the lower end of the hammerhead are inclined planes and directly face the four extension arms of the test piece in a one-to-one correspondence mode. The drop hammer type dynamic biaxial extension test device has the advantages that the four clamping devices are driven to move simultaneously through the hammerhead, four ends of the test piece are loaded simultaneously, the dynamic mechanical type biaxial extension of the test piece is realized, the structure is compact and simple, and the cost is low; and the test piece with different biaxial extension angles and different extension displacement ratios can be loaded by changing an included angle between the two adjacent extension arms on the test piece, changing the positionbetween the two corresponding groups of clamping devices and changing an inclined angle of the lower end surface of the hammerhead, and thus, the loading of the test piece is flexible and varied.