Every car body is deformed, which is one of the last things we want to hear. In the car accident, the deformation of the car body is serious, so the deformation of various parts of the car is introduced in detail, I hope everyone can understand it. Deformation characteristics of automobile body under the action of external force: now the frameless load-bearing automobile body is widely used, that is, there is no frame, and the engine and chassis assembly are directly fixed on the corresponding parts of the automobile body. When accidents such as car collision and rollover occur, the deformation of the car body is more serious. The damage of the load-bearing car body is not only caused by the heavy load, but also caused by the wear and tear of the door and other parts, which often make the parts in abnormal working condition. When a collision occurs, it generally has a great influence on the overall deformation. Characteristics of deformation of front car body: The deformation of front car body is mainly caused by frontal collision. When the impact force acts on the front end of the longitudinal beam, it will cause all kinds of deformation and damage, including bending, folding and deformation of the upper and lower fenders. When the impact force passes through the rear, it will cause greater deformation. The shock wave acts on all parts of the car body, and the deformation trend is related to the impact force and the size and direction of the colliding object. Deformation characteristics of the rear body: the deformation of the rear body is mainly caused by reversing or rear-end collision, and its deformation law and failure tendency are roughly the same as those of the front body. Rear-end collision will not only seriously damage the bumper, trunk and so on. Moreover, the arch beam will bend and the rear suspension will dislocate. The diffusion effect of large impact force may also lead to the deformation of body panel, floor, rear panel and even roof, window pillar and door pillar. Characteristics of body deformation: Body deformation is caused by side collision. Even a slight side impact will damage the body panel; Severe collision may also deform the door, center pillar, roof, etc. , and move the front and rear bodies, etc. Side impact will affect the correct assembly of engine and steering system components. Measurement of overall deformation of automobile body: The positioning detection of automobile body shaping is to measure the coordinate parameters of each measuring point on the automobile body by using the measuring system provided by the straightening system, and compare the measured data with the standard data of the vehicle type to check the straightening quality. In order to ensure comparability, positioning datum points, measuring tools and detection contacts must meet the regulations and requirements of calibration and measurement systems. Body correction system is widely used in modern automobile body modeling. Measuring device for automobile body: The commonly used measuring devices for automobile body can be divided into three categories: gauge measuring system, general measuring system and special measuring system. Gauges of measuring system include gauge, center gauge and column gauge. General measuring system can be divided into laser measuring system and mechanical general measuring system. The special measuring system is a completely different measuring equipment from the aforementioned measuring system. Measurement of automobile body deformation: the measurement methods of automobile body deformation include size measurement, upper body size measurement, front body size measurement, side plate and rear body size measurement, and bottom body deformation measurement. Each dimension shall be checked against the other two reference points, at least one of which shall be used for angle measurement.