ABSTRACT
There are basically two types of vehicle construction: one uses a frame on to which the vehicle is built; the other is called unitary construction where the body and frame are built as a unit to which subframes are added to support the suspension and other components. The frame is normally made from low-carbon steel
that is formed into shapes to provide maximum strength; box and channel sections are frequently used for this purpose. The frame shown in Fig. 1.3 has a deeper section in the centre area of the side members because this is where the bending stress is greatest. In areas where additional strength is required, such as where suspension members are attached, special strengthening supports are fitted.
