1. Engineering
  2. Mechanical Engineering
  3. note 1 kip10 lb 1kpsi1kipin 1 psi1 lbin 1 drill...

Question: note 1 kip10 lb 1kpsi1kipin 1 psi1 lbin 1 drill...

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Note: 1 kip-10° lb, 1kpsi-1kipin- 1 psi-1 lb/in 1. Drill is penetrating into a piece of wood as shown in Fig. 1. Torsional moment (T 10 axial load (P 100lb) are applied to the wood. Consider the drill blade as solid circular shaft with its dia lb-in) and meter of di 4 in The blade is made of tool steel with its yield strength, σ,-100 ksi-10° psi. Answer the following questions. p- 100 lb Drill T-10 lbin Wood Fig. 1 Drill penetrating into a piece of wood (1) Find stresses acting on the outermost surface of the drill blade and draw free body diagram of the blade. (2) Draw the Mohrs circle to represent the stress state of the outermost surface of the blade. Includes all numbers, units in the Mohrs circle for full credits. (3) Find the principal stresses, di and ơ2. (4) Investigate if the blade undergoes yielding using the distortion energy theory (Misess theory). What is the safety factor (n,) against yielding? ( Hint: In plane stress, Misess yielding criterion s σ-Vof + σ1-σισ? a.)

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