Mechanics of materials ques / stresses in beams

[macbarbicus]

Homework Statement

refer to attachment

Homework Equations

The Attempt at a Solution

I am completely confused at where to start can someone get me going in the right direction here as to one of the answers.

 

[PhanthomJay]

Hi, Macbarbicus, welcome to PF!

Per forum rules, you are going to have list what you believe are the relevant equations, and show some attempt at your work, before we can be of assistance. You should be familiar with the shear flow formula which indicates how the shear stresses vary over the beam cross section.

 

[Mene]

I would suggest starting by reviewing the fundamental principles of mechanics of materials, specifically the concepts of stress and strain. In beams, stress is the force per unit area that is exerted on the material and strain is the resulting deformation of the material. The relationship between stress and strain is described by Hooke's Law, which states that stress is directly proportional to strain within the elastic limit of the material.

To solve for stresses in beams, you will need to consider the different types of loads that the beam is subjected to, such as bending, shear, and axial loads. Each type of load will result in a different type of stress on the beam. For example, bending loads will result in tensile and compressive stresses on opposite sides of the beam, while shear loads will result in shear stresses parallel to the cross-section of the beam.

To determine the stresses in a beam, you will also need to know the properties of the material, such as its modulus of elasticity and its moment of inertia. These properties can be found in materials tables or can be calculated using the dimensions and material properties.

Once you have a good understanding of the basic principles and equations involved in calculating stresses in beams, you can then apply them to the specific problem presented in the attachment. Start by identifying the type of loads acting on the beam and then use the appropriate equations to calculate the corresponding stresses. Remember to check your answers and make sure they fall within the elastic limit of the material.

I hope this helps get you started in the right direction. It is always important to have a solid understanding of the fundamentals before attempting to solve more complex problems in mechanics of materials. Good luck!