Failure Analysis of Brake Hose Assembly_www.orient-silicone-hose.com

Failure Analysis of Brake Hose Assembly

日期:2021-05-17 浏览:

1. Problem: The inner tube of the brake hose is very hard and has been cracked.

Reason: High temperature simply separates the plasticizer from the inner tube, which is a material that makes the hose soft and plastic. The oil containing the gas can make the inner tube oxidize. This oxidation reaction on rubber products can harden them. Oxygen and high temperature will greatly accelerate the hardening of the tube inside the hose. Cavitation in the inner tube has the same effect.

2. Problem: The brake hose is cracked both internally and externally, but the elastic data is still flexible and flexible at room temperature.

Reason: The reason is that the environment temperature is extremely low when the hose buckles. Most standard hoses have an extra temperature of -40 degrees, some AQP hoses have an extra temperature of -49 degrees, usually military hoses have an extra temperature of -54 degrees, some thermoplastic hoses have an extra temperature of -54 degrees, and teflon hoses have an extra temperature of -73 degrees.

3. Problem: The brake hose broke, stripped the outer glue and checked the steel wire reinforcement layer. It was found that there was irregular steel wire cracking on the whole length of the hose.

Reason: This indicates that the hose is under high frequency pressure shake. SAE's impact test on two-layer wire woven hoses required 200, 000 cycles at 133% of the recommended working pressure. SAE required 500, 000 cycles for impact testing of a four-ply surround hose. If the number of extrapolation pulses in the system exceeds 1 million in a relatively short period of time, it is best to select the hose around the reinforcement layer.

4. Problem: The brake hose broke, but there were no multiple steel wire cracks on the whole hose length. The hose can burst in more than one place.

Reason: This indicates that the pressure has exceeded the hose's minimum explosive strength.

It is recommended to use a hose of higher strength, or the hydraulic line presents a fault that can cause abnormal high pressure conditions.



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