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Materials 2.

Strength of Materials 2

QuestionAnswer
What is Poisson's Ratio? Poisson's Ratio (v) - Transverse Strain/Axial Strain. (Has no units). each material has its own poisson's ratio. values has to be between -1.0 and + 0.5. A V values of 0 means that a sample would squash straight down without spreading out to the sides
What are Auxetics? These are materials that have negative Poisson ratios (-ve v). If you try to stretch them, they actually get wider.
Explain the Force-Extension Graph? The Area under the Force-Extension graph is work done per unit volume. Since workdone is equal to the applied force x by movement (extension) in the direction of the force.
Analysis of a Stress -Strain Graph. The gradient is Stiffness.The steeper the line the greater the stiffness of the material.
who is nardia pyne? nardia pyne is the coolest
What is Brittle Fracture? characterized by very low plastic deformation
What is Toughness? ability of a material to resist fracture. Toughness has units of energy per volume.
Stress- Srain Graph. Limit of proportionality - beyond which no longer obeys hooke's law. Elastic Limit - Beyond which sample will be permanently distorted. Yield stress - beyond which there is a significant increase in the ease of distortion.
Stress- Srain Graph 2. Ultimate Tensile Stress - largest stress that the sample can withstand. Breaking Stress - at which the 2 ends of the sample are seperated.
Created by: frantost