Mechanical Design Concepts for non-mechanical engineers ...
Transcript of Mechanical Design Concepts for non-mechanical engineers ...
22/02/2013
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Mechanical Design Concepts for
Non-Mechanical Engineers
by
Steve Mackay
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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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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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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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