Analysis of Test Elements in A Dust Environment Simulation Chamber

The main effects of sand and dust on the test specimen are abrasion and erosion, such as jamming, blockage, reduced heat conduction or dissipation, and electrostatic effects leading to malfunctions like jamming, increased wear, and electrical overheating. However, there are many influencing factors in sand and dust testing. Below, we will discuss them.

Sand and Dust Test Element Analysis:

Test Equipment: Environmental Instruments, Sand Blowing Environment Simulation Chamber

1. Sand/Dust Particle Diameter

The standard for sand and dust testing methods specifies clear requirements for the particle diameter and concentration of sand and dust, as shown in the table below.

2. Dust Concentration

Currently, there are no relevant test standards for"Technical Conditions of Dust Test Chambers" in domestic standards, and the test methods do not specify clear requirements for this indicator. However, in JJF 18-2012 Calibration Specification for Dust Test Equipment, the "dust concentration" is defined as the average value of the dust concentration at 9 points (volume ≤ 2 m³, < 0.05 m³ can be reduced) or 15 points (volume > 2 m³, > 50 m³ can be increased) at the same locations as the temperature calibration points inside the test chamber.

3. Wind Speed

The main function of wind is to simulate airflow in the natural environment and provide stable test conditions for dust and sand. GJB 150.12A-2009 specifies the following requirements for dust blowing speed: maintain a minimum wind speed of 1.5 m/s required for the test conditions, and a higher speed of 8.9 m/s typical of desert winds. GJB 150.12A-2009 specifies the following requirements for sand blowing speed: unless the equipment is used in the field with higher wind speeds, the sand blowing speed should be 18~29 m/s to ensure that sand particles collide with the specimen at a speed of 18~29 m/s. To achieve this speed, the distance between the sand inlet and the specimen should be approximately 3 m.

4. Temperature:

In GJB 150.12A-2009, the temperature for dust settling tests is (23±2)℃. RTCA/DO-160G specifies two stages for sandblasting and dust settling tests: (25±2)℃ and (55±2)℃, taking into account the differences in wear characteristics of different materials under room temperature and high temperature conditions.

5. Humidity:

Because excessive relative humidity may cause dust particles to agglomerate, GJB150.12A-2009 stipulates that the relative humidity for sandblasting, dust settling, and dust removal should not exceed 30%.

The above is an analysis of the test elements for sand and dust tests. For any questions regarding the tests, please consult the relevant technical personnel at Huanyi Instruments.