18 Questions
What type of forces are compressive and tensile forces?
Direct forces
Which of the following is NOT a reason for solid mechanics being a vast subject?
Limited applications
What happens to a body under a compressive force?
It gets shorter
Which type of stress is defined as the force per unit area perpendicular to which it acts?
Normal stress
How does normal stress arise?
From uniformly applied direct forces
What is the concept used to obtain the distribution of force acting over a sectioned area?
$\sigma=P/A$
What type of stress is maximum on a bar in tension?
Zero shear stress and maximum normal stress
When considering stress elements, how many basic states of stress exist at a point in a stressed body?
One
How are the force components resolved on an inclined section through a bar?
Normal and shear forces
What is the relationship between the force components and the inclined plane in stress analysis?
Force components are tangent to the inclined plane
In terms of the rotated coordinate system x1y1, when may a material yield or fail?
At any angle other than 90 degrees
How are stresses distributed on inclined sections in a bar?
Uniformly distributed throughout the bar
What is the relationship between the strains of the concrete block and the steel bar in a composite material?
They are equal: ε1 = ε2
In force equilibrium for a composite material, what does F = F1 + F2 represent?
Resultant force of the composite material
What assumption leads to the shortening being the same inside material 1 and material 2?
Perfect bonding assumption
In Example 9, what is the expression for σs in terms of Ec and σc?
(Ec σc) / Pc
What is the condition for plane stress in the xy plane for a 3D element?
σz = 0 and τzx = τxz ≠ 0, τZY = τYZ = 0
What is the main purpose of representing stresses using stress elements?
To simplify stress analysis
This quiz covers concepts related to force equilibrium and compatibility of strain in composite materials. Topics include understanding the relationship between forces, stresses, areas, and material properties in a composite system. Example problems involving concrete blocks and steel bars are also included.
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