Sponge compression fatigue tester is a kind of experimental equipment used to test the durability of materials under repeated loading. The equipment is widely used in material research and quality control in construction, automotive, machinery, electronics and other fields. In this paper, the characteristics of sponge materials, the principle and structure of sponge compression fatigue testing machine, experimental methods and data processing are introduced.

Sponge compression fatigue testing machine experiment overview

First, the characteristics of sponge materials

Sponge material is a kind of porous material, its main characteristics are soft and elastic, with good shock absorption and cushioning. Due to its physical and chemical structure, the mechanical properties of sponge materials are affected by many factors, such as material density, porosity, compression degree, etc. Therefore, it is important to study the compression fatigue properties of sponge materials to evaluate their service life and function.

Second, the principle and composition of sponge compression fatigue testing machine

The sponge compression fatigue testing machine is mainly composed of compression device, loading system, control system and data acquisition and analysis system. The compression device includes a circular indenter and a circular mold, and can be compressed for sponges of different shapes and sizes by changing the diameter and height of the mold. The loading system generally adopts electro-hydraulic servo control, which can realize multiple cyclic loading, and the control system is responsible for monitoring the changes of various parameters during the test, such as the displacement of the inpressure head, the load size, etc., to ensure the accuracy and reliability of the test data. The data acquisition and analysis system is used to record and process test data, such as stress-strain curves, elastic modulus, fracture strength, etc.

Iii. Experimental methods and data processing

The experimental methods of sponge compression fatigue test include single point compression, multi-point compression and triaxial compression. Among them, single point compression is a common experimental method, and its steps are as follows: First, the sponge sample to be tested is placed in the middle of the mold, and then a predetermined load is applied for compression. When the load returns to zero, the next loading cycle is restarted. In the experiment, appropriate parameters such as load amplitude, number of cycles and test temperature should be set according to the needs of the experiment, and the test data should be recorded in time for subsequent data analysis and processing.

Sponge compression fatigue testing machine experiment overview

In terms of data processing, it mainly includes the drawing of stress-strain curve, the calculation of elastic modulus and the evaluation of fatigue life. The stress-strain curve is the key data to evaluate the compressive properties of materials, which is obtained from the changes of load and displacement during the test. The elastic modulus is a parameter that reflects the stiffness of the material and is generally calculated by linear regression method. Fatigue life refers to the number of cycles a material can withstand before failure under specified loading conditions, and its evaluation methods include S-N curve method and limit state method.

In summary, sponge compression fatigue testing machine is an important material testing equipment, through the compression fatigue test of sponge materials can be effective