(a) Explanation The sign conventions for the stress components are explained below. The outward normal on the right-hand face of the element is representing as the positive x and x ' axes. The normal stress σ x and σ x ' are positive if it acts along the positive x and x ' axes. The normal stress σ y and σ y ' are positive if it acts along the positive y and y ' axes. The shear stress τ x y and τ x ' y ' are positive if it acts along the positive x and x ' and y and y ' axes. Calculation: Apply sign conventions to the given Figure. The value of normal stresses are σ x = 80 MPa and σ y = − 120 MPa . The value of shear stress is τ x y = − 40 MPa . The procedure to construct Mohr’s circle is shown below. The coordinate systems are the horizontal axis represents the normal stress with positive towards right and the vertical axis represents shear stress with positive downwards. Plot the center of the circle C which is located σ avg = σ x + σ y 2 from the origin. Plot the reference points A having coordinates A ( σ x , τ x y ) . This point represents that the x ′ axis coincides with the x axis. Hence, θ = 0 ° . Connect the point A with the centre C and find CA by trigonometry which represents the radius of the circle R . Sketch the circle. Find the average normal stress ( σ avg ) using the relation: σ avg = σ x + σ y 2 (1) Substitute 80 MPa for σ x and − 120 MPa for σ y in Equation (1). σ avg = 80 − 120 2 = − 20 MPa Therefore, the average normal stress is − 20 MPa _ . Therefore, the coordinates of the reference point C is ( − 20 , 0 ) (b) To determine The maximum in-plane shear stress. The average normal stress. The orientation of the principal stresses. The orientation of the maximum in-plane shear stress.

9th Edition

ISBN: 9789810694364

Author: Russell C Hibbeler

Publisher: Pearson Education

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Chapter 9.4, Problem 9.54P

(a)

To determine

The principal stresses.

(b)

To determine

The maximum in-plane shear stress.

The average normal stress.

The orientation of the principal stresses.

The orientation of the maximum in-plane shear stress.

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Chapter 9.4, Problem 9.53P

Chapter 9.4, Problem 9.55P

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Chapter 9 Solutions

Mechanics Of Materials, Si Edition

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