A grade 30 gray cast iron is subjected to a load F applied to a 1 by -in cross-section link with a --in-diameter hole drilled in the center as depicted in Fig. 6–31a. The sur- faces are machined. In the neighborhood of the hole, what is the factor of safety guard- ing against failure under the following conditions: (a) The load F = 1000 lbf tensile, steady. (b) The load is 1000 lbf repeatedly applied. (c) The load fluctuates between – 1000 lbf and 300 lbf without column action. %3D - Use the Smith-Dolan fatigue locus.

A grade 30 gray cast iron is subjected to a load F applied to a 1 by -in cross-section link with a --in-diameter hole drilled in the center as depicted in Fig. 6–31a. The sur- faces are machined. In the neighborhood of the hole, what is the factor of safety guard- ing against failure under the following conditions: (a) The load F = 1000 lbf tensile, steady. (b) The load is 1000 lbf repeatedly applied. (c) The load fluctuates between – 1000 lbf and 300 lbf without column action. %3D - Use the Smith-Dolan fatigue locus.

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Concept explainers

Introduction to Engineering Design Process

The engineering design process is a set of steps that engineers follow to come up with a solution to a particular problem. The solution to the problem involves the designing of a product that can accomplish a certain task and can qualify certain criteria. The process of designing is completely different from that of the scientific method, that you may be familiar with. If the project utilizes the observations, and the experiments then the engineering design process must be followed. The diagram shows the steps of the engineering design process, and the table below describes each step in more detail:

Question

MECH.ENG. DESIGN 1 PART 2

A grade 30 gray cast iron is subjected to a load F applied to a 1 by -in cross-section
link with a -in-diameter hole drilled in the center as depicted in Fig. 6–31a. The sur-
faces are machined. In the neighborhood of the hole, what is the factor of safety guard-
ing against failure under the following conditions:
(a) The load F = 1000 lbf tensile, steady.
(b) The load is 1000 lbf repeatedly applied.
(c) The load fluctuates between – 1000 lbf and 300 lbf without column action.
Use the Smith-Dolan fatigue locus.
%3D
-
F
Sut = 31 ksi, Se= 109 ksi
ka k, S̟'= 14 ksi
q = 0.2
||
-1 in–
in D. drill
in
Fig. 6–31a
F
Shigley's Mechanical Engineering Design

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Table 1: Mechanical behavior of human cadaver tibial bones during pure torsional loads applied with the proximal tibia fixed and the torque applied to the distal tibia until there is bone fracture. Medial condyle Tibial tuberosity- Medial malleolus -Lateral condyle Head of fibula Ti-6Al-4V grade 5 Stainless Steel 316L Region of bone resection -Lateral malleolus L = 365 mm Annealed Annealed Torque at ultimate failure (bone fracture) Displacement (twist angle) at ultimate failure Torsional Stiffness Table 2: Mechanical properties of candidate materials for the rod. Material Process Yield Strength (MPa) 880 220-270 Do = 23 mm Elastic Modulus (GPa) 115 190 d₁ = 14 mm Figure 1: Representative tibia bone showing the resection region (blue arrows) and median length (L). A circular cross section of distal tibia taken at the level of resection) showing the median inner (di) and outer (Do) diameters of the cortical bone. A tibia bone after resection with the proposed metal solid rod (black line)…