ABSTRACT
The car body structure is a highly redundant structure with more than one load path and
the sharing of the load is a function of the component relative stiffness. In static stress
analysis, only the loads that cause elastic strains and stresses in the structure are
studied in such a way that there is no yielding of the material or joint failure results.
Practical experience suggests that a vehicle structure which is strong enough to endure
the maximum dynamic loads, which occur sporadically, will also have sufficient
resistance against repeated dynamic forces at less than their average value (fatigue
loading), then the key factor in the design analysis process is the determination of ‘The
Dynamic Load Coefficient' which can be used in the static analysis. [1]
The structural stress analysis of the car body is carried out by the discussion of:
1- The concept of the load-bearing structure.
2- The determination of the input loads.
3- Implementation of different theories for the static of the structure and the strength of
the body and its joints.
The first part of the structural stress analysis is the study of the load-bearing structure.
The general description of the car body structural components under consideration in
this paper and its three subassemblies are discussed followed by the descriptions of the
structural model idealization.