Static load

Load condition on the structure that is constant with time

Transient (dynamic) load

Load condition on the structure that is varying with time

Combined load

Combination of static and dynamic load conditions on the structure

Thermal Load

Stresses induced by thermal expansion or contraction

Factor (margin) of Safety

Ratio of limit load to operating load. Limit load may be yield (permanent deformation) or ultimate (failure)

Fatigue

Failure of a structure due to repetitive loading at amplitudes substantially below maximum load capability

Fracture Mechanics

Crack initiation and propagation of the crack
Failure due to crack growth
Self arresting non-critical cracks

Natural Frequency

Frequency of dynamic load which results in maximum stresses and deflections - a condition of resonance

Finite Element Method - FEM

Numerical technique for the solution of complex structural problems. Object to be analyzed is broken down into many small pieces or “elements” to which the governing equations are applied. Requires computer for solution

Linear Stress Analysis

Performed when the structural displacements are proportional to the applied loads.

Non-linear Stress Analysis

Performed when gaps in the structure open or close during loading, or non-linear material stress strain behavior exists