Destructive Testing and Properties Flashcards

A side bend test is most commonly used for:

Answer: Thick plate welds to evaluate through-thickness soundness

Side bend tests are typically required for base metal thicknesses 3/8 inch (10 mm) and greater to examine the full through-thickness cross-section.

What does a Charpy test temperature requirement primarily protect against?

Answer: Brittle fracture at low or sub-zero service temperatures

Charpy testing at specified minimum temperatures verifies that the material retains adequate toughness to resist brittle fracture in cold service conditions.

In a fillet weld break test, which discontinuity would be considered a failure?

Answer: Incomplete fusion at the root

Incomplete fusion at the root is a rejectable defect revealed by the fillet weld break test because it compromises load-carrying capacity.

What is the gauge length used to calculate percent elongation typically related to?

Answer: The cross-sectional area or a fixed multiple of the specimen diameter

Gauge length is standardized relative to specimen cross-section, commonly 2 inches for flat specimens or 4× or 5× the diameter for round specimens.

Which property describes a material's ability to absorb energy during plastic deformation before fracturing?

Answer: Toughness

Toughness is the ability to absorb energy and plastically deform without fracturing, represented by the area under the stress-strain curve.

The guided bend test mandrel diameter is specified to control:

Answer: The outer fiber strain imposed on the weld

The mandrel diameter determines the bend radius, which directly controls the outer fiber strain experienced by the weld during the test.

Reduction of area in a tensile test is calculated by comparing the original cross-sectional area to:

Answer: The minimum cross-sectional area at the fracture

Reduction of area is calculated as ((A₀ − Af) / A₀) × 100%, where Af is the minimum cross-sectional area at the fracture location.