Visual Testing (VT) Practice Exam

Chevrons may occur in which of the following materials?

1. Plates.

2. Weldments.

3. Bar stock.

4. Valve castings.

The correct answer is: Bar stock.

Chevrons are specific patterns typically observed in materials that have undergone certain types of failure or fatigue. They often occur in materials that are subjected to cyclic loading, and their formation is indicative of the material undergoing stress. Materials such as bar stock, which includes long, solid pieces of metal that can be either round or rectangular, are particularly susceptible to structural stresses during manufacturing processes or when subjected to tension or bending. Chevrons can be observed in bar stock when it experiences fatigue leading to crack propagation. The linear nature of bar stock makes it a prime candidate for chevron patterns, especially under repetitive stress. In contrast, while chevrons may occasionally be present in other materials, the specific parameters and conditions typically associated with bar stock make it the most common context for encountering these patterns. Therefore, through its characteristics and behavior under stress, bar stock serves as the primary material where chevrons can be expected to appear.