Assignment Creep and Fatigue

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Added on 2020-04-15

Assignment Creep and Fatigue

Added on 2020-04-15

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Running head: CREEP AND FATIGUE1Creep and FatigueNameInstitution

CREEP AND FATIGUE2Creep and FatigueQuestion 1Part 1Stress relaxation refers to the decrease in stress under constant strain. In other words, the reduction “time-dependent decrease in stress acting on a body that is constrained to a fixed deformation.” A good example is in bolts which are designed to hold rigid bodies tightly. In suchbolts, the stress will reduce after an extended period. Part 2Creep rupture strength refers to “the highest stress that a material can withstand without rupture for a specified length of time.” For example, in a turbine blade, the creep rupture strength is the stress that produces a fracture in either 103 hours or 104 hours or105hours for working at an absolute temperature of 1073K.Part 3On the other hand, creep life refers to the time for a material to fracture for a given static load. Part 4The factors affecting creep include: Load: the rate of creep is directly proportional to the load. That is, creep rate increases with the increase in load and decreases with the decrease in load.The temperature: the creep rate increases with the increase in temperature.

CREEP AND FATIGUE3 Composition: Creep is more pronounced in pure metals as opposed to alloys. Notably, pure metals are softer than alloys. The different phases present stops the dislocation glide. Heat treatment changes the material structure which affects the material properties and subsequently, the creep resistance. Material grain size. The smaller the grain size, the stronger the material whereas the larger the grain, the weaker the material. However, above Equicohesive temperature, the property of the material will reverse.Question 2Using the MATLAB code attached in figure 1 and plotting the data points yields figure 2.“Figure 1: The MATLAB Code”“Figure 2: MATLAB Plot”

CREEP AND FATIGUE4Question 3“Figure 3: MATLAB Code”“Figure 4: MATLAB Plot”

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Assignment Creep and Fatigue