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The compression and fatigue behavior of a Ca 65 Mg 15 Zn 20 bulk-metallic glass (BMG) was studied in air at room temperature. During the preparation of cubical samples of the Ca 65 Mg 15 Zn 20 for compression and fatigue investigations, small spherical cavities were found. Under both monotonic and cyclic compression loadings of the samples, fractures initiated at these cavities and propagated in a direction generally parallel to the loading axis. Finite-element analysis (FEA) was used to model the fracture behavior. The FEA of a centrally located spherical void showed that under compression loading, large tensile stresses evolved in the cavities. The orientation of the maximum principal stress (P1) was found to be normal to the direction of crack propagation, which is consistent with the experimental finding. Stresses in deeply embedded adjacent voids and those in superficial voids were also studied. The influence of the void location in the cubical sample on the fracture behavior was quantitatively discussed.

Simplified models of several configurations of structural steel arc weldments were made as an aid to understanding the importance of penetration and weld size with respect to fatigue crack initiation tendencies. Surprising findings were that the presence of a gap (simulating less than ideal fit up) may increase or reduce the value of the highest stress depending on the configuration. The effect of residual stresses was not included in the model, however causes and effects of residual stresses in welds will be briefly described in a qualitative manner.

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