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Chapter
8
Failure Analysis
Failure analysis is important in structural and machine
design. Large structures and machine components may fail under
repeated loading. This can occur even though the magnitude of the
repeated load is much less than the critical static load. In this
chapter, we will employ the finite element method via ANSYS
Workbench to predict life of structural components caused by
buckling and fatigue. We will use academic examples as well as a
practical application to demonstrate capability of the software for
failure analysis.
For static loading, the popular failure theory of a
ductile material is the maximum shear stress theory. Based on the
Tresca criterion, the theory states that,
max yield 2
where is the maximum shear stress and yield is the yield
max
stress.
