Fatigue Testing of Artificial Joint Materials with Working Waves

User Benefits

- Servo Controller 4830 enables high-precision dynamic control. - Fatigue strength evaluation of artificial joint materials is possible using the Servopulser series. - Force can be applied to specimens based on the force waveform data recorded in a CSV file.

Introduction

Artificial joints have been evaluated by fatigue tests because they are required to be durable against repeated load in daily life. In fatigue testing, it is common to apply a sine wave force or displacement to the specimen. However, the ankle has complex compressive loads that occur during walking. Therefore, by applying this force during walking to the specimen, it is possible to evaluate the fatigue strength in accordance with the actual application. In this article, a case is presented in which the force applied to an ankle joint during walking was actually applied to a specimen. First, the TM5135, a compact telemetry system manufactured by Toyota Technical Development Corporation shown in Fig. 1, was used to measure strain data during walking and to generate force waveforms. Next, the generated force waveforms were loaded into a fatigue testing machine, and the force was applied to a square polyethylene material (23.5×23.5×12 mm) used as an artificial ankle joint material.

July 11, 2023 GMT