Let's investigate the internal stresses of a laminated beam subjected to the 3-point bend test. compare the distribution for the following cases (a) [0,+-45, 90]s and (b) [90/+-45/0]s. in this case, plot latex: \sigma σ x/latex: \sigma σ max using the following properties of unidirectional graphite/epoxy composite. compare the maximum stress in the plot with that found in the equation for maximum stress (refer to the slide titled inplane stress).

e11 = 126 gpa
e22 = 12.2 gpa
g12 = 7.6 gpa
v12 = 0.3
explain what you notice about these plots. is this what you would expect to see? why or why not? how does it compare to the case of a homogeneous beam (i. e., a beam made from one material)?

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

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