  Bounds on the trace mappings defined on the Sobolev space W^{1,1}(Omega) and
the space $LD(Omega)$ of integrable stains are obtained. Such bounds correspond
to stress concentration--the ratio between the maximal stress in a body and the
maximum of the traction applied to its boundary. The analysis leading to the
bounds may be described in the mechanical context of stress theory and stress
concentration.
