How does the ultimate tensile stress of mild steel compare to its ultimate compressive stress__________________?
Show answer Hide answer
Answer: B. more
Explanation
Mild steel has a higher ultimate tensile strength compared to its ultimate compressive strength due to internal microstructural behavior under loads. Internal microstructural slip systems and dislocation movements behave differently under tensile pulling versus compressive crushing forces. Standard material testing confirms that mild steel exhibits slightly superior resistance to tensile loads than to compressive yielding. Mild steel is a ductile alloy containing low carbon percentages, providing balanced mechanical strength in various directions. Compressive tests on ductile metals often result in bulging rather than clean fractures, making ultimate compressive strength harder to define. Tensile testing provides clear, repeatable ultimate stress values due to well-defined necking and rupture phenomena.
Assuming tensile and compressive strengths are the same ignores documented anisotropic or microstructural differences in steel behavior. Mild steel actually demonstrates higher tensile strength, making the reverse assumption incorrect for structural engineering calculations. The strength ratio is predictable and well-documented through extensive standardized material testing procedures in metallurgy.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. How does the peak stress induced by a sudden load compare to a gradual load application________________?
Show answer Hide answer
Answer: C. two times
A suddenly applied load transfers kinetic energy that instantaneously doubles the maximum strain and stress. Gradual loading allows the material to deform slowly while internal resistance builds up alongside the load. Dy...
Q2. 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...
Q3. 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,...
Q4. What physical condition is represented by a non-yielding support_________________?
Show answer Hide answer
Answer: D. slope of the beam at the support is zero
A non-yielding built-in or fixed support provides complete rigidity against both displacement and rotation. Because rotation of the structural member is entirely prevented at the fixed boundary, the slope must be zero. T...
Q5. 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...
Q6. 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...