Cartilage creep mechanical performance testing device

Abstract

The invention discloses a cartilage creep mechanical performance testing device. The device wholly adopts a symmetrical double-layered bracket structure and comprises a central shaft, a movable test sample platform, a first bracket and a second bracket. The movement of the central shaft is controlled by a straight-line bearing with a flange and the speed of the central shaft is controlled by a hydraulic buffer arranged on the first bracket; a weight tray is fixedly disposed on the hydraulic buffer; the top of the central shaft is provided with an LVDT (Linear Variable Differential Transformer) displacement sensor; a pressure head is arranged at the bottommost end of the central shaft and a pressure sensor is arranged at the position which is tightly close to the pressure head; and the movable test sample platform formed by a test sample groove and a test sample groove bracket is fixedly disposed on a bottom support of the second bracket. The device disclosed by the invention is simple in structure, low in cost and convenient to measure; and in a whole testing process, a computer is used for detecting signals from the pressure sensor and the displacement sensor and can measure the variation of displacement-time of a test sample under a constant load in a simulated body fluid environment, and the variation of pressure-displacement of the test sample under a constant loading speed.

Description

technical field [0001] The invention belongs to a mechanical property testing device, in particular to a cartilage creep mechanical property testing device. Background technique [0002] Articular cartilage is the load-bearing tissue that makes up the synovial joint, which transmits and distributes the compressive loads applied to the joint and provides a load-bearing surface with a very low coefficient of friction. Since cartilage is the first to be damaged in osteoarthritis, a precise understanding of its mechanical properties is essential. In addition, the understanding of the mechanical properties of cartilage also provides a basis for the design of bionic cartilage repair materials that conform to the principles of biomechanics, which has important research value and is of great significance in promoting the development of cartilage biomechanics. [0003] Articular cartilage is considered as a two-phase material. When a load is applied, its solid phase deforms instanta...

AI Technical Summary

Problems solved by technology

However, the design of the device is relatively complicated, the loading and unloading of the sample is not convenient enough, and the creep behavior of cartilage under simulated body fluid environment cannot be measured.

At present, there is no molded equipment in China for the measurement of cartilage creep properties, so it is very important to develop a mechanical performance experimental device specially used for the study of cartilage creep mechanical properties

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