Mechanical Shock Test Machine Manufacturer From China

Usually, the standard shock test system is equipped with a half-sine wave generator. In fact, the half-sine wave generator is mainly made of engineering rubber (considering the stiffness and cohesion of rubber) and felt pads of various thicknesses. Different thicknesses form multiple stiffnesses in series to achieve different shock pulse widths. The post-peak sawtooth generator is a lead cone. The trapezoidal wave generator gas source is high-pressure nitrogen, the pressure range is 1-10MPa, and the overload value can be adjusted between 10-100g.

Mechanical impact testing is the application of high acceleration to a component, product, system, or structure over a very short period of time. This is a test to observe product response or degradation. Effect of simulated acceleration pulse on test sample in a mechanical impact test. According to the investigation, this may be caused by a shock, a fall, an explosion, or other high-amplitude, short-duration acceleration or deceleration.

Although there is overlap between the two definitions. However, there is also a difference between vibration testing and mechanical impact testing. Just because it takes longer to apply, from a few minutes to a few weeks. Mechanical shock tests typically last less than a second per shock, but often multiple shocks are performed over a longer period of time.

Mechanical impact testing is done to accurately measure the brittleness of your product and assess the level of protection of the package. We can provide the most advanced impact test equipment to meet your application needs. Whether you want to perform a thorough product damage boundary assessment, the industry-standard impact pulse. Or conditions specified by your own company.

Here Linkotest summary of some examples of mechanical impact testing machines

1) Typical mechanical shock test equipment

Usually, advanced mechanical impact testing involves the use of a mechanical impact tester. It accelerates the test sample until it receives the impact through the impact barrier. However, unlike driving into a wall, the test sample usually does not directly affect the obstacle.

Instead, the test sample is attached to a metal plate, which is usually much more massive than the test sample. We attach the test sample to one side of the platen, away from the impact surface. Place compressible material between impact surfaces. The mechanical properties of this material, such as thickness and stiffness, control the pulse shape during impact events.

Did you know that the impact amplitude is controlled by the velocity of the specimen at the time of impact? Sometimes, test samples and platen can simply be dropped from the desired height. Gravity will produce the desired impact velocity. Mechanical impact testing machines typically use compressed air to provide greater acceleration than gravity alone. In this way reduce the required height of the machine or obtain a higher speed than gravity alone. In fact, hydraulic systems are also commonly used to lift samples and electrical plates to their starting height.

#1. Computer-controlled mechanical shock testers

Computer-controlled mechanical shock testers can also directly measure the impact pulses received from the accelerometer mounted on the platform. The computer can then adjust the fall height and air pressure to more precisely match the impact you need for future shocks. In addition, as the affected material changes its properties in successive shocks, the computer is constantly modified.

In general, this type of mechanical impact tester runs downward in only one direction (accelerating upward due to impact deceleration). Mechanical impact testing may require you to repeatedly test the “upside down” sample. Because if an impact is applied 180 degrees in the opposite direction, the effect on your test sample may be different. In addition, special clamps are required to mount the test sample in all 6 directions (3 axes by 2 directions). A typical test specification might call for three shocks in each of the six directions, for a total of 18 shocks.

2) Mechanical shock test using an electrodynamic vibration test system

For lower shock amplitude and duration, we typically apply a mechanical shock input to the test sample using an electrically driven vibration test system (or “vibrator”). With this type of universal test equipment, virtually any desired impact pulse shape and frequency composition can be applied to the test sample. It also allows your test sample to maintain its normal vertical orientation (using the horizontal shock of the slide). However, the displacement of the exciter limits the maximum mechanical shock amplitude and duration that can be achieved.

Generally, physical shock does not occur when using an electric shaker. Because the vibrator is just capable of providing the necessary deceleration. However, the shaker must also accelerate the test sample to the desired speed before a rapid deceleration shock event can occur. Thus, the end velocity after the impact event is zero. This can also be done in reverse order. Since the test sample needs to accelerate and decelerate at the same time, a large amount of displacement is required. Especially if the pulse duration is long. Therefore, even if the shaker has enough force to perform the required mechanical shock, it may not be possible to do so because the maximum displacement of the shaker is not enough).

3) Example of mechanical impact test

Furthermore, in addition to dropping tests for packaged products, the most common mechanical impact test for typical electronics is the classic half-sine (more accurately, the Haval sine). It is well known that a roughly triangular (zigzag) pulse is the second most common pulse.

Sometimes, shock pulses with very high amplitudes are specified as SRS(shock response spectrum) in the frequency domain, rather than the classical time-domain pulse shape. Did you know that the most common mechanical shock test for electronics is a half-sine wave with a peak amplitude of 20 or 30 g and a duration of 11 milliseconds?

Common impact tests:

• Repeated impact test
• Half-sine wave
• Sawtooth wave
• Trapezoidal wave

Mechanical Shock Standard:

• ASTM D4169
• EN/IEC 61373
• EN/IEC 68-2
• ISO 16750-3
• Ista
• UN38.3
• JESD/JEDEC
• MIL-STD 810G
• and more!

In fact, mechanical shock testing looks at the effects of a sudden applied force or sudden change in motion. These changes can interfere with your operating characteristics or cause damage, especially if the shock vibration is repeated.

Mechanical shock testing can determine if your device is suitable for use with electronic equipment that has suffered moderate to heavy impact. These shocks come from rough handling, transportation, or field operations. Mechanical impact testing utilizes impact and drops tests and is generally considered destructive.