Chapter 9, Problem 9.4P

6.(计算题) Calculate the DOF of following mechanisms. If there are compound hinge, passive DOF or Redundant Constraint, please point them out. E D A B C F

A hot surface at 150°C is to be cooled by attaching 3-cm-long, 0.25-cm-diameter aluminum pin fins (k = 237 W/m-K) to it, with a center- to-center distance of 0.6 cm. The temperature of the surrounding medium is 30°C, and the heat transfer coefficient on the surfaces is 35 W/m²K. Determine the rate of heat transfer from the surface for a 1-m × 1-m section of the plate. Also determine the overall effectiveness of the fins. 0.6 cm 0.25 cm The total rate of heat transfer is kW. The fin effectiveness is

Consider a stainless steel spoon (k = 8.7 Btu/h·ft·°F) partially immersed in boiling water at 200°F in a kitchen at 75°F. The handle of the spoon has a cross section of 0.08 in × 0.5 in and extends 7 in in the air from the free surface of the water. The heat transfer coefficient at the exposed surfaces of the spoon handle is 3 Btu/h·ft2·°F.   NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part.  A spoon is placed inside the container, such that the distance of the water level from the top end of the handle of the spoon is 7 meters. T sub air is indicated in the region outside the container.       Identify the assumptions required to solve the problem.   Check All That Apply One-dimensional heat transfer analysis is used to solve the problem. One-dimensional heat transfer analysis is used to solve the problem. Bi-dimensional heat transfer analysis is used to solve the problem. Bi-dimensional heat transfer analysis is…

A turbine blade made of a metal alloy (k=17 W/m-K) has a length of 5.3 cm, a perimeter of 11 cm, and a cross-sectional area of 5.13 cm². The turbine blade is exposed to hot gas from the combustion chamber at 1133°C with a convection heat transfer coefficient of 538 W/m²K. The base of the turbine blade maintains a constant temperature of 450°C and the tip is adiabatic. NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Hot gas h=538 W/m²K -Turbine blade k = 17 W/m-K p=11 cm, L=5.3 cm A = 5.13 cm² -T=450°C Determine the heat transfer rate to the turbine blade. W. The heat transfer rate is

Consider a very long, slender rod. One end of the rod is attached to a base surface maintained at Tb, while the surface of the rod is exposed to an air temperature of 400°C. Thermocouples imbedded in the rod at locations 25 mm and 120 mm from the base surface register temperatures of 325°C and 375°C, respectively. NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. . x1 32 x Calculate the rod base temperature (°C). The rod base temperature is °C. Air T∞

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This is a tilt and rotation question. Here are notes attached for reference. ONLY UPLOAD A SOLUTION IF YOU ARE SURE ABOUT THE ANSWER PLEASE.

What is the difference between true stress/strain and engineering stess/strain? And how do I calculate them?

A rotating shaft of 20 mm diameter is simply supported. The shaft is loaded with a transverse load of 10 kN as shown in the figure. The shaft is made from AISI 1095 hot-rolled steel. The surface has been machined. The shaft operate at temperature T = 450 °C. Consider a reliability factor of 95%. Determine (a) Calculate the reaction forces R, and R₂ (2 points) (b) Draw the shear force and bending moment diagrams and determine the maximum bending moment and shear force. (6 points) 200 mm 20 mm 10,000 N -50 mm- A Not to scale. (c) Determine the critical location of the shaft and the maximum effective stresses. (3 points) (d) Calculate the safety factor against yielding. Does the shaft undergo local yielding? (2 points) (e) Determined the endurance limit, adjusted as necessary with Marin factors. (12 points) (f) Calculate the fatigue factor of safety based on achieving infinite life. (2 points) (g) If the fatigue factor of safety is less than 1 (hint: it should be for this problem), then…