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Page 1: Mechanical Design Concepts for non-mechanical engineers

22/02/2013

1

www.eit.edu.au

Mechanical Design Concepts for

Non-Mechanical Engineers

by

Steve Mackay

www.eit.edu.au

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� ���� � ����" ��� # � ���� � �Load, P

P

Area Ao

Lo

∆L/2

∆L/2

Load, P

P

Area Ao

Lo

∆L/2

∆L/2

tension compression

Axial force:

A load directed along the axis of the object resulting in

either tension orcompression

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� � # �� �� ����

0AP=σ

Stress that acts in a direction perpendicular to the cross-sectional area.

Normal stress is the force per unit area and is given by:

Where

� is the stress in N/m2

P is the instantaneous force applied perpendicular to the specimen cross- section in N

A0 is the original cross-section prior to deformation in m2.

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Eσ ε=

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� ������ ��� ��$ � �& �#elongation

0.2% offset yield stress

Sy

proportional limit

(ultimate)E

engineering strain (e = ∆L/Lo)

engi

neer

ing

stre

ss (S

=P/A

o)

O

A

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– Process by which the metal is subjected to degradation &

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Galvanic corrosion is an electrochemical action of two dissimilar metals in the presence of an electrolyte and an electron conductive path. It occurs when dissimilar metals are in contact.

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��� � � ���� � �� � �Crevice or contact corrosion is the corrosion produced at the region of contact of metals with metals or metals with nonmetals. It may occur at washers, under barnacles, at sand grains, under applied protective films, and at pockets formed by threaded joints.

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� ������� � �� � �Stress corrosion cracking (SCC) is caused by the simultaneous effects of tensile stress and a specific corrosive environment. Stresses may be due to applied loads, residual stresses from the manufacturing process, or a combination of both.

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( ��� & ���� � �� � �Corrosion fatigue is a special case of stress corrosion caused by the combined effects of cyclic stress and corrosion. No metal is immune from some reduction of its resistance to cyclic stressing if the metal is in a corrosive environment.

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�� �� ������ � �� � �Concrete is a widely-used structural material that is frequently reinforced with carbon steel reinforcing rods, post-tensioning cable or prestressing wires. The steel is necessary to maintain the strength of the structure, but it is subject to corrosion.

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� ���. �/ � �( � �/ � �� ������If you are interested in further training, please visit:

IDC Technologies:Two-day practical courses available to the public:

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Conferences: www.idc-online.com/cons/

The Engineering Institute of TechnologiesOnline Certificate and

Advanced Diploma programs:www.eit.edu.au

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