car door hinge fracture analysis
Introduction
The integrity of the car door hinge is of great importance to the safety of the car. However, with the increasing number of cars, car door hinge fractures have become a common phenomenon. According to the incomplete statistics, many car manufacturers have recently been exposed to relatively serious cases of car door hinge fractures. These cases have caused serious safety problems and therefore need to be further analyzed to reduce the occurrence and severity of this phenomenon.
Causes of Car Door Hinge Fracture
The door hinge of the car is composed of hinge pins, leaf springs and other accessories. The failure of its components or the poor assembly of the components can cause the car door hinge to fracture. Compared with traditional hinge components, the materials used in car door hinge are mostly made of high strength steel or aluminum alloy, which is more resistant to fatigue failure.
1. Mechanical fatigue
The fatigue fracture of the car door hinge is mostly caused by repetitive loads for a long period of time, leading to a gradual decrease in material strength, followed by fracture. The main factors that can cause such mechanical fatigue include: incorrect material selection (greater than required strength), improper assembly (weak joints or insufficient bonding), or incorrect mounting position (resulting in an excessive locking force or excessive preloading of the spring). Additionally, the high temperature and cold environment can cause the car door hinge to expand or contract, which may also accelerate mechanical fatigue and result in fracture.
2. Corrosive destruction
The car door hinge can also be corroded by the intrusion of corrosive substances. The corrosion cracks formed on the surface of the material are prone to crack propagation under the combined action of stress corrosion and corrosion fatigue, resulting in the fracture of the car door hinge. The corrosion of the door hinges can be caused by rainwater, sludge, road salts, cleaning chemicals, engraving fluids and other substances.
3. Load destruction
Inappropriate external loads on the car door hinge may cause fracture due to overload. Improper operation or large external loads can easily exceed the bearing load of the hinge, causing large deformation of the car door hinge and resulting in fracture. In addition, the unilateral load caused by collision can also damage the car door hinge, resulting in fracture.
Effects of Car Door Hinge Fracture
The functioning of the car door hinge is essential to the safety of the car. Once the car door hinge fractures, it will greatly reduce the overall safety of the car and cause great potential safety hazard.
1. Difficulty closing or opening the car door
When the car door hinge is partially cracked, it will cause problems in the closing and opening of the car door. As a result, the two ends of the door can not be tightly closed, and the sealing of the door will be greatly reduced. Because of the inefficient sealing, rainwater and dust will easily enter the car, and the safety of the car will also be affected.
2. Reduced load-bearing ability
Once the car door hinge fractures, the car narrows its check-in area, which significantly reduces its load-bearing ability. Even a slight touch of the car door will cause the car door to deform and misalignment, and the fracture of the car door hinge will also bring greater aesthetic damage to the car.
3. Car body instability
Car hinges connect the door panels to the body. Fracture of the car door hinge will result in instability and vibration of the door, further resulting in misalignment, deformation and loosening of the connection between the body and the door panel. Meanwhile, the fractured car door hinge may interfere with the sliding of the window and make the window adopt an unstable posture, or even cause serious damage to the power window system.
Prevention of Car Door Hinge Fracture
In order to reduce the prone of car door hinge fracture and improve car safety, the following measures should be taken:
1. Install more reliable car door hinge
Car door hinges usually come in two types: small hinges and large hinges. Normally, the small hinges are more prone to fracture, so the car door hinges should be replaced with larger ones. This will increase the bearing force of the car door hinge and reduce the chance of its fracture.
2. Apply anti-corrosion treatment
The door hinges can be treated with anti-corrosion coating and treated with anti-corrosion grease for a long time to resist the corrosion of water, acid and other corrosive substances, which can effectively reduce the corrosion damage of the door hinges and reduce the probability of fracture.
3. Regular inspection of door hinges
Maintenance staff should regularly check the door hinges to find and process hidden dangers in time. When the car door is opened and closed frequently, the door hinge needs to be checked, and the door hinge should be checked when the weather changes and the air humidity changes.
Conclusion
The integrity of the car door hinge is of great importance to the safety of the car. Car door hinge fracture is a common problem caused by fatigue or corrosion of the hinge and improper external loads. In order to reduce the occurrence of car door hinge fracture and ensure car safety, more reliable car door hinges should be installed, anti-corrosion treatment should be applied, and regular inspection of door hinges should be conducted.
