Accurate Measurements of Micro-Displacements in a Compression Fatigue Test of a Gasket

User Benefits

- The Servo Controller 4830 enables high-precision dynamic control. - A compression plate displacement measuring device allows accurate measurements of micro-displacements of a few μm and sample displacements and excludes the deflections of the testing machine.

Introduction

Gaskets are sealants that prevent the leakage of gases and liquids inside metal pipes and the entry of foreign substances. They are used in various applications, such as automobile engines and chemical and power plants. In the case of an automobile engine, the pressure of combustion gases generated during operations is repeatedly applied. So resistance to the internal pressure is important, which is why gaskets are evaluated by compression tests. Gaskets used in automobiles are typically 1–1.5 mm thick, and the displacement is expected to be a few μm when such samples are compressed. If the displacement of a sample in a compression test is small, it is not desirable to evaluate the actuator stroke of the testing machine as the displacement of the sample. This is because the stroke displacement of the actuator includes the deformation of the load cell and test jig. In this article, a compression fatigue test of a gasket was carried out by attaching a compression plate displacement measuring device capable of measuring micro-displacements to the dynamic and fatigue testing machines servo pulser. The displacement data obtained from the compression plate displacement measuring device was approximately 1/3 of the stroke displacement, which enabled measuring the displacement of the sample with greater accuracy.

November 29, 2022 GMT