Does stress change with thickness?

As the plate thickness increases, the magnitude and area of the stress concentration increases.

What affects strength of a material?

Volume, modulus of elasticity, distribution of forces, and yield strength affect the impact strength of a material.

What determines the tensile strength of a material?

Tensile strength is indicative of the strength derived from factors such as fiber strength, fiber length, and bonding. It may be used to deduce information about these factors, especially when used as a tensile strength index.

How does the thickness of a rubber sheet affect its tensile strength?

Think of the tensile strength as a property of the material: how much force it takes to break a certain cross sectional area. The thickness of your rubber sheet definitely affects the force you will need to apply for a given amount of elongation. Thickness also affects the breaking point, and therefore the tensile strength, of your rubber sheet.

What is the relationship between thickness and tensile strength?

This is fine for defect free materials, but if you have a cracked material, this relationship no longer holds. Cue, fracture mechanics. Tensile strength is a unit strength (i.e. X pounds per square inch of cross-section). so thickness generally has nothing to do with it.

What happens when you increase the thickness of a material?

If you increase the thickness, you increase the load at failure, but this is divided by a proportionally bigger area so it doesn’t make any difference. This is fine for defect free materials, but if you have a cracked material, this relationship no longer holds. Cue, fracture mechanics.

Does the thickness of a steel plate affect its yield strength?

Yield Strength or Yield Stress is a property of the material, and does not vary with geometry. It can be safely stated that a steel plate of 5 mm thickness will have the same yield strength as a steel plate of 50 mm thickness. So, the answer to your question is ‘NO’.