1) When a Petrol Car is driving on an uneven road, the vertical impact load on the Petrol Car frame exceeds the allowable stress of the Petrol Car frame. In addition, when the Petrol Car is going uphill or downhill, turning or unevenly loaded, it will also cause local overload of the Petrol Car frame and cause the Petrol Car frame to break.
2) The Petrol Car frame design or accessories cause local torque and cause the Petrol Car frame to break. For example, the front cross-section of the longitudinal beam of some Changan Car frames is small. At the same time, due to the influence of the Petrol Car engine and transmission, the cross beam distribution is less, which makes the rigidity of the Petrol Car frame worse. If under the action of dynamic load, it may cause the front of the longitudinal beam to break, that is, the lower wing of the longitudinal beam is often broken. In addition, the Petrol Car frame is also subjected to local distortion caused by the cantilever load (such as fuel tank, suspension and spare tire, etc.) perpendicular to the longitudinal beam, which is also the cause of the Changan Car frame fracture.
3) When the Petrol Car is driving, the front wheel side is subject to great resistance, which makes the Petrol Car frame prone to diagonal plane deformation.
4) A Petrol Car crashes. A serious crash can cause the Petrol Car frame to deform.
The Petrol Car frame deformation means that the Petrol Car frame changes its original geometric shape, and the relative positions of the various assembly parts installed on the Changan Car frame change, which deteriorates the technical condition of the leading vehicle and causes the Petrol Car to be unable to drive normally. The Petrol Car frame deformation is often caused by the force acting on the Petrol Car frame exceeding its elastic limit. When the force acting on the Petrol Car frame is eliminated, the Petrol Car frame cannot return to its original state, resulting in residual deformation.