Why does shot-peening a part improve its fatigue strength?
True or False 1. For a fatigue failure, a part always fails above the ultimate strength of the material. 2. For a ductile material, the tensile yield strength and the compressive yield strength are not equal 3. Mode I of crack propagation occurs due to compressive stress 4. Distortion energy theory is used to predict failure for brittle materials 5. Temperature does not affect the endurance limit of a material 6. For a fatigue failure, a part always fails above...
Why are fillers added to polymers? A)To improve compressive strength. B)To improve toughness. C)To improve tensile strength. D)To improve thermal stability. E)To improve flexibility. (Allowed to select multiple answers)
(A) Describe how fatigue damage happens in a ductile material. Draw sketches if needed. (B) If we maintain a constant stress σ-0.9G (GIs the yield strength) on a steel, will fatigue damage happen? Why? (A) Describe how fatigue damage happens in a ductile material. Draw sketches if needed. (B) If we maintain a constant stress σ-0.9G (GIs the yield strength) on a steel, will fatigue damage happen? Why?
The assignment must be submitted at the beginning of the lecture on the due date. The Assignment page(s) must form the cover page of your submission. 1. Define fatigue strength. Fatigue strength is generally one-fourth to one-half of the tensile strength. Determine the ball park value of fatigue 1 strength in the form Y + AY using the given figure for a metal that has tensile strength of 800 MPa. Here Y- Fatigue strength. Mark 'solidus', and liquidus' on the...
A steel rotating-beam test specimen has an ultimate strength of 210 kpsi. Estimate the fatigue strength corresponding to a life of 200,000 cycles of stress reversal.
1) Determine unmodified fatigue strength (units = MPa) of hot-rolled 1020 steel shaft in axial loading for a design life of 100,000 cycles. Do not apply any fatigue correction factors. SN _______________ 2) Determine unmodified fatigue strength (units = ksi) for a normalized 4140 steel shaft in bending for a design life of 107 cycles. Do not apply any fatigue correction factors. SN _______________ 3) Determine unmodified fatigue strength (units = MPa) for heat-treated 6061 aluminum rod in torsion for...
Why does replacing a hub with a switch improve an Ethernet users capacity?
10. Why does the CDC not consider the collection of data to evaluate and improve a particular program to research?
Why does the strength of genetic drift depend on a large or small population?
part A,B and C please Part A Constants What is the speed of the shot when he releases it? Sam heaves a shot with weight 16-lb straight upward, giving ita constant upward acceleration from rest of 42.8 m/s for a height 68.0 cm. He releases it at height 2.25 m above the ground. You may ignore air resistance. u= m/s Submit Part B How high above the ground does it go? Submit PartC How much time does he have to...