For each curve, please indicate the location where failure occurs. Do you consider the point enclosed by the red circle to be the failure point? If your answer is positive, please explain the cause of the curve segment enclosed by the red rectangle. If not, please specify which point you would identify as the failure point.
To find the strain at failure for AA6061-T6 FSW specimens, locate the fracture point on the stress-strain curve-the final strain value before the load drop. For engineering curves, read es directly, for true strain, calculate In(1+e). Typical FSW weld zones fail at 5-12% strain (vs. 12-20% for base metal), with abrupt fractures requiring high-resolution data or DIC for accuracy, Compare results to literature (e.g.. ~8.3% in transverse welds).
Yes, the point enclosed by the red circle in each graph (A–D) likely represents the failure point, as it occurs immediately after the peak load or maximum stress, indicating the onset of material degradation. The portion of the curve highlighted by the red rectangle illustrates the post-failure behavior, where a decline in load-bearing capacity is observed despite continued deformation. This segment is crucial for analyzing the ductility or brittleness of the material, providing insights into how it behaves after failure, which is essential for structural integrity assessments and material selection in engineering applications."The failure point is defined as the point at which the material reaches its maximum load or stress capacity, after which any increase in strain leads to a reduction in stress or load."
(ASTM E8/E8M – Standard Test Methods for Tension Testing of Metallic Materials)
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