What is the tensile stress value recorded at the exact moment of fracture in a material_________________?
Show answer Hide answer
Answer: A. breaking stress
Explanation
Breaking stress is calculated at the exact moment when the material fractures completely. This value represents the final stress sustained before the structural member breaks apart entirely. Engineers measure this specific parameter to understand the absolute failure limit of materials. Ultimate tensile stress occurs at the maximum load point before necking begins. Fracture stress and breaking stress are terms for the final failure point. Standard tensile tests record force and elongation continuously until the specimen ruptures.
Knowing breaking stress helps engineers select safe materials for critical structural components. Building designs must account for the ultimate breaking point to prevent catastrophic structural failures. This property is essential in manufacturing industries for quality control and material grading. Yield point stress marks the onset of permanent plastic deformation rather than final fracture. Ultimate tensile stress is the peak stress on the engineering stress-strain curve. Proof stress is a specified stress value used to determine a pseudo yield strength.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. How is the torsional rigidity of a shaft mathematically represented_______________?
Show answer Hide answer
Answer: D. torque required to produce a twist of one radian per unit length of shaft
Torsional rigidity is defined mathematically as the torque required to produce a twist of one radian per unit length of the shaft. This mechanical property combines the shear modulus of the material with the polar moment...
Q2. At what stress threshold does material elongation accelerate rapidly relative to load increments______________?
Show answer Hide answer
Answer: D. yielding point of the material
The yielding point marks the specific stress threshold where plastic deformation initiates and material elongation accelerates rapidly under loads. At this critical juncture, atomic crystal planes slide past each other,...
Q3. What stress magnitude is required to initiate plastic yielding_________________?
Show answer Hide answer
Answer: A. considerably greater than that necessary to continue it
Static friction or initial yielding requires greater stress to start than to continue. Overcoming initial molecular bonding and static stiction demands higher peak force thresholds. Once plastic flow or motion is initiat...
Q4. What are the standard engineering units for Young’s modulus__________________?
Show answer Hide answer
Answer: D. kg/cm2
Young's modulus has the dimensions of stress, which is expressed in standard metric engineering units as kg/cm2. Because strain is dimensionless, the units of Young's modulus match the units of tensile stress exactly. Ol...
Q5. What magnitude does the modulus of elasticity typically have for mild steel________________?
Show answer Hide answer
Answer: B. 2.1 X 106 kg/cm2
The modulus of elasticity for mild steel is universally recognized and standardized around two point one times ten to the sixth kg/cm2. This large numerical value reflects the high stiffness of iron-carbon crystal lattic...
Q6. The total vertical stretching of a uniform hanging bar due to its own weight is equivalent to the extension caused by a concentrated weight of________________?
Show answer Hide answer
Answer: B. half the weight of bar applied at lower end
The distributed weight of a hanging bar creates a triangular load profile along its entire length. Integrating this linear self-weight distribution mathematically results in an effective total elongation factor of one-ha...